Rheem 952030H0-HV YF Series Air Water Heat Pump Owner’s Manual

Rheem 952030H0-HV YF Series Air Water Heat Pump

Product Information

Specifications

• Product Name: YF Series Commercial Air to Water Heat Pump Water Heater
• Model Numbers: 95301500/0V, 95201500/0V, 953015H0/HV, 952015H0/HV, 95303000/0V, 95203000/0V, 953030H0/HV, 952030H0/HV
• Manufacturer: Rheem Australia Pty Ltd
• Trademark: Rheem
• Material: Contains low burning velocity material

Product Usage Instructions

Installation

This water heater must be installed by a qualified person.
Please follow the steps below for proper installation:

1. Choose a suitable location for installation, ensuring it is within the boundaries of a metropolitan area as defined by Rheem or within 25 km of a regional Rheem branch office or an Accredited Rheem Service Agent’s / Centre’s office.
2. Ensure proper ventilation and clearance around the unit as specified in the installation manual.
3. Connect the water supply and electrical connections according to the provided instructions.
4. Verify that all connections are secure and properly sealed.
5. Test the water heater to ensure it is functioning correctly before use.

Servicing

Regular servicing of the water heater is essential to ensure optimal performance and longevity. Follow these guidelines:

• Schedule annual maintenance checks by a qualified service technician.
• Inspect the unit for any signs of damage, leaks, or unusual noises.
• Flush the tank to remove any sediment buildup.
• Check and clean the air filters regularly.
• Ensure proper insulation around the unit to prevent heat loss.

Safety Precautions

When using the YF Series Commercial Air to Water Heat Pump Water Heater, please observe the following safety precautions:

• Do not operate the water heater if it is damaged or shows signs of malfunction.
• Do not attempt to repair or modify the unit yourself. Contact a qualified service technician.
• Keep flammable materials away from the water heater.
• Do not touch any electrical components without proper insulation and protection.
• Turn off the power supply before performing any maintenance or servicing tasks.

Frequently Asked Questions

Q: Can I install the water heater myself?

A: No, this water heater must be installed by a qualified person to ensure proper installation and safety.

Q: How often should I schedule maintenance checks?

A: It is recommended to schedule annual maintenance checks by a qualified service technician to ensure optimal performance.

Q: What should I do if I notice a leak or unusual noise?

A: If you notice any signs of damage, leaks, or unusual noises, contact a qualified service technician for inspection and repair.

Owners Guide and

Installation Instructions

YF Series Commercial Air to Water Heat Pump Water Heater
WARNING: THIS WATER HEATER CONTAINS LOW BURNING VELOCITY MATERIAL
WMKA21549
This water heater must be installed and serviced by a qualified person. Please leave this guide with a responsible officer.

An electronic copy of these Owner’s Guide and Installation Instructions can be downloaded from rheem.com.au and rheem.co.nz.
PATENTS This water heater may be protected by one or more patents or registered designs.
TRADEMARKS ® Registered trademark of Rheem Australia Pty Ltd.
TM Trademark of Rheem Australia Pty Ltd.
NOTE: Every care has been taken to ensure accuracy in preparation of this publication. No liability can be accepted for any consequences, which may arise as a result of its application.

RHEEM AUSTRALIA PTY LTD, A.B.N. 21 098 823 511 www.rheem.com.au, www.rheem.co.nz
For Service Telephone 131 031 AUSTRALIA or 0800 657 335 NEW ZEALAND
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RHEEM HEAT PUMP WATER HEATER WARRANTY – AUSTRALIA & NEW ZEALAND ONLY ­
HEAT PUMP WATER HEATER MODELS 95301500/0V, 95201500/0V, 953015H0/HV, 952015H0/HV, 95303000/0V, 95203000/0V, 953030H0/HV, 952030H0/HV
1. THE RHEEM WARRANTY ­ GENERAL
1.1 This warranty is given in Australia by Rheem Australia Pty Limited ABN 21 098 823 511 of 1 Alan Street, Rydalmere New South Wales, and in New Zealand by Rheem New Zealand Limited of 475 Rosebank Road Avondale Auckland 1026.
1.2 Rheem offer a trained and qualified national service network who will repair or replace components at the address of the water heater subject to the terms of the Rheem warranty. Rheem Service, in addition can provide preventative maintenance and advice on the operation of your water heater. The Rheem Service contact number in Australia is 131031, with Contact Centre personnel available 24 hours, 7 days a week to take your call and if necessary to arrange a service call for during normal working hours Monday to Friday (hours subject to change) or in New Zealand on 0800 657 335.
1.3 For details about this warranty, you can contact us in Australia on 131031 or by email at warrantyenquiry@rheem.com.au (not for service bookings), or in New Zealand on 0800 657 335 or by email at rheem@rheem.co.nz (not for service bookings).
1.4 The terms of this warranty and what is covered by it are set out in sections 2 and 3 and apply to water heaters manufactured from the 1st September 2023.
1.5 If a subsequent version of this warranty is published, the terms of that warranty and what is covered by it will apply to water heaters manufactured after the date specified in the subsequent version.
2. TERMS OF THE RHEEM WARRANTY AND EXCLUSIONS TO IT
2.1 The decision of whether to repair or replace a faulty component is at Rheem’s sole discretion.
2.2 If you require a call out and we find that the fault is not covered by the Rheem warranty, you are responsible for our standard call out charge. If you wish to have the relevant component repaired or replaced by Rheem, that service will be at your cost.
2.3 Where a failed component or cylinder is replaced under this warranty, the balance of the original warranty period will remain effective. The replacement does not carry a new Rheem warranty.
2.4 Where the water heater is installed outside the boundaries of a metropolitan area as defined by Rheem or further than 25 km from either a regional Rheem branch office or an Accredited Rheem Service Agent’s / Centre’s office, the cost of transport, insurance and travelling between the nearest branch office or Rheem Accredited Service Agent’s / Centre’s office and the installed site shall be the owner’s responsibility.
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2.5 Where the water heater is installed in a position that does not allow safe or ready access, the cost of that access, including the cost of additional materials handling and/or safety equipment, shall be the owner’s responsibility. In other words, the cost of dismantling or removing cupboards, doors or walls and the cost of any special equipment to bring the water heater to floor or ground level or to a serviceable position is not covered by this warranty.
2.6 This warranty only applies to the original and genuine Rheem water heater in its original installed location and any genuine Rheem replacement parts.
2.7 The Rheem warranty does not cover faults that are a result of:
a) Accidental damage to the water heater or any component (for example: (i) Acts of God such as floods, storms, fires, lightning strikes and the like; and (ii) third party acts or omissions).
b) Misuse or abnormal use of the water heater.
c) Installation not in accordance with the Owner’s Guide and Installation Instructions or with relevant statutory and local requirements in the State or Territory in which the water heater is installed.
d) Connection at any time to a water supply that does not comply with the water supply guidelines as outlined in the Owner’s Guide and Installation Instructions.
e) Repairs, attempts to repair or modifications to the water heater by a person other than Rheem Service or a Rheem Accredited Service Agent / Centre.
f) Faulty plumbing or faulty power supply.
g) Failure to maintain the water heater in accordance with the Owner’s Guide and Installation Instructions.
h) Transport damage.
i) Fair wear and tear from adverse conditions (for example, corrosion).
j) Cosmetic defects.
2.8 Subject to any statutory provisions to the contrary, this warranty excludes any and all claims for damage to furniture, carpet, walls, foundations or any other consequential loss either directly or indirectly due to leakage from the water heater, or due to leakage from fittings and/ or pipe work of metal, plastic or other materials caused by water temperature, workmanship or other modes of failure.
2.9 If the water heater is not sized to supply the hot water demand in accordance with the guidelines in the Rheem water heater literature, any resultant fault will not be covered by the Rheem warranty.
2.10 In New Zealand this warranty excludes to the extent permissible all implied warranties set out in the Sale of Goods Act 1908 (New Zealand) and all guarantees set out in the Consumers Guarantees Act 1993 (New Zealand) to the extent that the goods are acquired
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for the purpose of resupply in trade consumption in the course of a process of production or manufacture or repairing or treating in trade other goods or fixtures on land.

3. WHAT IS COVERED BY THE RHEEM WARRANTY FOR THE WATER HEATERS DETAILED IN THIS DOCUMENT
3.1 Rheem will repair or replace a faulty component of your water heater if it fails to operate in accordance with its specifications as follows:

What components are covered

The period in which the fault must appear in order to be covered

What coverage you receive

All components

Year 1

Repair and/or replacement of the faulty component, free of charge, including labour.

Sealed System* components

Year 2

Repair and/or replacement of the faulty component, free of charge, including labour.

• The Sealed System includes components that carry refrigerant only, e.g. Compressor, Condenser,

TX Valve, Receiver / Drier, Evaporator and associated pipe work.

4. ENTITLEMENT TO MAKE A CLAIM UNDER THIS WARRANTY
4.1 To be entitled to make a claim under this warranty you need to:
a) Be the owner of the water heater or have consent of the owner to act on their behalf. b) Contact Rheem Service without undue delay after detection of the defect and, in any
event, within the applicable warranty period.
4.2 You are not entitled to make a claim under this warranty if your water heater:

a) Does not have its original serial numbers or rating labels. b) Is not installed in Australia or New Zealand.

5. HOW TO MAKE A CLAIM UNDER THIS WARRANTY
5.1 If you wish to make a claim under this warranty, you need to:
a) Contact Rheem on 131031 in Australia or 0800 657 335 in New Zealand and provide owner’s details, address of the water heater, a contact number and date of installation of the water heater or if that’s unavailable, the date of manufacture and serial number (from the rating label on the water heater).
b) Rheem will arrange for the water heater to be tested and assessed on-site.
c) If Rheem determines that you have a valid warranty claim, Rheem will repair or replace the water heater in accordance with this warranty.
5.2 Any expenses incurred in the making of a claim under this warranty will be borne by you.

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6. THE AUSTRALIAN CONSUMER LAW 6.1 Our goods come with guarantees that cannot be excluded under the Australian Consumer
Law. You are entitled to a replacement or refund for a major failure and for compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. 6.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you may have under the Australian Consumer Law.
7. THE CONSUMER GUARANTEES ACT 1993 (NEW ZEALAND) 7.1 Our goods come with guarantees that cannot be excluded under the Consumer
Guarantees Act 1993 (New Zealand). If the goods fail to comply with the applicable guarantees set out under the Consumer Guarantees Act 1993 (New Zealand) being the guarantee as to acceptable quality, the guarantee as to correspondence with description or the guarantee as to repair and parts, or if the goods fail to comply with any express guarantee given by Rheem, then you are entitled to a replacement or refund and for compensation for any other reasonably foreseeable loss or damage. 7.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you may have under the Consumer Guarantees Act 1993 (New Zealand).
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SAFETY, WARNINGS, INSTALLATION NOTES

It is important you read the following safety and warnings information.
SAFETY AND WARNINGS
· This water heater is only intended to be operated by persons who have the experience or the knowledge and the capabilities to do so.
· This water heater is not intended to be operated by persons with reduced physical, sensory or mental capabilities i.e. the infirm, or by children. Children should be supervised to ensure they do not interfere with the water heater.
· If the electrical conduit to the water heater is damaged, it must be replaced by a qualified person in order to avoid a hazard. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection.
· This water heater uses 415V / 240 V AC electrical power for operation of the control systems and other electrically operated components. The removal of the access cover(s) will expose 415V / 240 V wiring. They must only be removed by a qualified person.
· This water heater contains low burning velocity material.
· This water heater is supplied with built in Rheem IQ Controller which controls low and high pressure switches.
Additionally, the compressor is fitted with thermal overload protection, the condenser heat exchanger is fitted with a pressure relief valve, the heat pump is supplied with a built in ambient temperature sensor and the storage tanks are supplied with a combination temperature pressure relief valve. These devices must not be tampered with or removed. The water heater must not be operated unless each of these devices is fitted and is in working order.
· The water heater will operate until a water temperature of 60°C to 65°C is reached, depending upon the setting of the controller.
Refer to “How Hot Should The Water Be?” on page 12.
· The lever on the temperature pressure relief valve on the storage tank and expansion control valve (if fitted) requires to be operated every six (6) months to clear any deposits and to ensure the valve and its drain line are not blocked.
Refer to “Relief Valves” on page Error! Bookmark not defined. and “Minor Maintenance Every Six Months” on page 21.
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· For continued safety of this water heater it must be installed, operated and maintained in accordance with the Owner’s Guide and Installation Instructions.
· Servicing of a water heater must only be carried out by qualified personnel. Phone Rheem Service or their nearest Accredited Service Agent / Centre.
· Only a person qualified to install or service a water heater can drain the water heater, if this is required.
· Do not modify this water heater.
RELIEF VALVES Temperature Pressure Relief Valve The storage tank connected to this water heater incorporates a temperature pressure relief valve located near the top of the storage tank. This valve is essential for the water heater’s safe operation.
It is possible for the valve to discharge a quantity of water through the drain line during each heating period. This quantity should be equal to approximately 1/50 of the hot water used, as water expands by this volume when heated.
Expansion Control Valve In many areas, including South Australia, Western Australia, New Zealand and scaling water areas, it is mandatory an expansion control valve is fitted to the cold water line to the water heater.
The expansion control valve will discharge the quantity of water from its drain line during the heating period instead of the temperature pressure relief valve as it has a lower pressure rating.
Valve Operation Continuous leakage of water from either valve and its drain line may indicate a problem with the water heater. Refer to “Temperature Pressure Relief Valve or Expansion Control Valve Running” on page 26.
Warning: Never block the outlet of either valve or their drain lines for any reason. A relief valve drain must be left open to atmosphere and be installed in a continuously downward direction.
In locations where water pipes are prone to freezing, the relief valve drain line must be insulated and not exceed 300 mm in length before discharging into a tundish through an air gap.
Operate the easing lever on the temperature pressure relief valve and expansion control valve once every six (6) months to clear any deposits and ensure the valve and its drain line are not blocked. It is very important the lever is raised
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and lowered gently. Refer to “Minor Maintenance Every Six Months” on page 21.
Warning: Water discharged from the temperature pressure relief valve drain line will be hot. Exercise care to avoid any splashing of water by standing clear of the drain line’s point of discharge when operating either valve’s easing lever.
DANGER: Failure to operate the easing lever on the relief valve once every six (6) months may result in the storage tank cylinder failing, or under certain circumstances, exploding.
If water does not flow freely from the drain line when the lever is lifted, then the water heater must be checked. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection.
The temperature pressure relief valve should be replaced at intervals not exceeding five (5) years and the expansion control valve should be checked for performance or replaced at intervals not exceeding five (5) years. The checking of the valves performance or replacement should occur more frequently in areas where there is a high incidence of water deposits. Refer to “Water Supplies” on page 22.
INSTALLATION NOTES This water heater must be installed:
· by a qualified person,
· in accordance with the installation instructions,
· in compliance with the Plumbing Code of Australia (PCA) and Plumbing Standard AS/NZS 3500.4,
This water heater is suitable for either indoor or outdoor installation model dependent and subject to an adequate supply of fresh air.
This water heater is intended to be permanently connected to the water mains and not connected by a hose-set. A braided flexible hose or semi-flexible connector may be used for connection to the water heater, where permitted by AS/NZS 3500.4.
· in compliance with the Australian / New Zealand Wiring Rules AS/NZS 3000,
An isolation switch must be installed at the switchboard in the electrical circuit to the water heater, and also adjacent to the water heater, in accordance with the Wiring Rules, so the water heater can be switched off. Refer to “Connections ­ Electrical” on page 59.
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The power supply wires are to be directly connected to the terminal block, with no excess wire loops inside the front cover. The temperature rating of the power supply wires insulation must suit this application.
· In compliance with AS/NZS 60335.2.40-2019 and/or ISO 5149.3-2014 with regards to A2L material.
· in compliance with all local codes and regulatory authority requirements. · in New Zealand also conforming to Clauses G12 and H1 of the New
Zealand Building Code. Installation and commissioning requirements and details for the installing plumber and licensed electrical worker are contained on pages 28 to 77 Mains pressure water supply The water heater is designed to operate at mains pressure by connecting directly to the mains water supply. Refer to the table on page 32 for relief valve operating pressures and maximum supply pressures.
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ABOUT YOUR WATER HEATER

WATER HEATER APPLICATION This water heater is designed for the purpose of heating potable water. Its use in an application other than this may shorten its life.

MODEL TYPE Congratulations for choosing a Rheem® commercial air to water (A2W) heat pump water heater. The Rheem A2W heat pump water heater is designed for outdoor or indoor installation, model dependent and subject to adequate supply of fresh air.
HOW HOT SHOULD THE WATER BE? The heat pump (compressor, evaporator and condenser) will operate until a water temperature of up to set point is reached.
To meet the requirements of the National Plumbing Standard (AS/NZS3500.4) the temperature of the stored water must not be below 60C.

minimum recommended stored water temperature
maximum recommended supply temperature to
bathrooms and ensuites

The factory setting is 65C.
Note: Australian Standard AS 3498 and New Zealand Building Code Clause G12 require that a water heater provides the means to inhibit the growth of Legionella bacteria in potable water. This water heater can satisfy these AS 3498 and Clause G12 requirements provided it is energised and the thermostat setting is 60°C or higher, including when it is used as an in-series booster water heater for a solar water heater.

HOTTER WATER INCREASES THE RISK OF SCALD INJURY This water heater can deliver water at temperatures which can cause scalding.

Check the water temperature before use, such as when entering a shower or filling a bath or basin, to ensure it is suitable for the application and will not cause scald injury.

We recommend and it may also be required by regulations that an approved temperature limiting device be fitted into the hot water pipe work to the bathroom and ensuite when this water heater is installed. he maximum permitted by the Plumbing Code of Australia and New Zealand Building Code Clause G12 to

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ABOUT YOUR WATER HEATER
these areas. The risk of scald injury will be reduced and still allow hotter water to the kitchen, laundry and other areas requiring sanitising temperatures.
TEMPERATURE ADJUSTMENT
Set Point Quick Setting Press prg’ from the main display screen and the Set Point page will appear. Cursor will be on the set temperature. Pressing the up and down keys will adjust the setting in 0.1 increments. Hold down for rapid change. Press ‘Enter’ to confirm change. Pressesc’ to return to the main display screen. Refer to page 72 for more information.
We advise the thermostats are adjusted to the lowest temperature setting that meets your needs, especially if there are young children or elderly people in the premises. Refer to “Hotter Water Increases the Risk of Scald Injury” on page 12.
PRECAUTIONS Under certain installation conditions where damage to property can occur in the event of the water heater leaking AS/NZS 3500.4 requires the water heater be installed in a safe tray. Construction, installation and draining of a safe tray must comply with AS/NZS 3500.4 and all local codes and regulatory authority requirements. In New Zealand the safe tray must also meet the requirements of Clause G12 of the New Zealand Building Code. AS/NZS 3500.4 and the NZBC also have particular requirements when a safe tray must be installed.
Alternatively, where additional leak protection is required for installations not defined by AS/NZS 3500.4, a suitable bund may be constructed to surround the water heater in lieu of using a safe tray.
The water heater must be maintained in accordance with the Owner’s Guide and Installation Instructions. Refer to “Maintenance Requirements” on page 20.
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or business you should ensure that you have back-up redundancy within the hot water system design. This should ensure the continuity of hot water supply in the event that this water heater were to become inoperable for any reason. We recommend you seek advice from your plumber or specifier about your needs and building back-up redundancy into your hot water supply system.
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ABOUT YOUR WATER HEATER
Do not use aerosols, stain removers and chemicals near the water heater whilst it is working. Gases from some aerosol sprays, stain removers and chemicals are corrosive to the materials used in the heat pump system. Do not store swimming pool chemicals, household or industrial cleaners, etc., near the water heater. Ensure the air inlet and outlet louvres and air flow are not obstructed in any way at any time.
TO TURN OFF THE WATER HEATER · Switch off the electrical supply at the isolating switch to the water heater. · Close the isolation valves at the inlet and outlet of the water heater.
TO TURN ON THE WATER HEATER · First, ensure the water is connected to storage tanks, the system is filled with
water and all valves between the tanks and the water heater are open. · Switch on the electrical supply at the isolating switch to the water heater. Note: The water heater may not turn on immediately when it is first switched on, if it is switched on within 20 minutes to 2 hours of it having been switched off at the isolating switch, or the heat pump has just completed a heating cycle. The water heater will wait until the conditions for start-up are favourable in order to protect the compressor from damage. This may take up to 20 minutes to 2 hours.
VICTORIAN CUSTOMERS Notice to Victorian Customers from the Victorian Building Authority. This water heater must be installed by a licensed person as required by the Victorian Building Act 1993.
Only a licensed person will give you a Compliance Certificate, showing that the work complies with all the relevant Standards. Only a licensed person will have insurance protecting their workmanship for 6 years. Make sure you use a licensed person to install this water heater and ask for your Compliance Certificate.
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ABOUT YOUR WATER HEATER
DOES THE WATER CHEMISTRY AFFECT THE WATER HEATER? The water heater is suitable for most public water supplies, however some water chemistries may have detrimental effects on the water heater, its components and fittings. Refer to “Water Supplies” on page 22. If you are not sure, have your water chemistry checked against the conditions described on pages 22 to 23. HOW LONG WILL THE WATER HEATER LAST? Your water heater is supported by a manufacturer’s warranty (refer to page 4). There are a number of factors that will affect the length of service the water heater will provide. These include but are not limited to the water chemistry, the water pressure, temperature (inlet and outlet) and the water usage pattern. ENVIRONMENT At the end of the service life of the heat pump water heater and prior to the water heater being disposed of, a person qualified to work with refrigerants must recover the refrigerant from within the sealed system. The refrigerant must not be vented to atmosphere. Phone your nearest Rheem Service Department or Accredited Service Agent (or Service Centre in NZ) to arrange for an inspection.
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HOW YOUR WATER HEATER WORKS

The Rheem commercial air to water heat pump is a monobloc type and does not have an integral storage cylinder. The unit is designed to be installed indoors or outdoors, model dependent and subject to an adequate supply of fresh air. The water heater’s evaporator absorbs heat from the surrounding air and transfers this heat into the water. A circulator transfers the heated water to a bank of storage tanks. The heat pump produces a sound level of up to 69 dBA (measured at 3 metres) when it is operating. The principal of operation and sound level are similar to that of an air conditioner.
When hot water is drawn off and cold water enters the storage tanks, a remote thermostat activates the fan, compressor and circulating pump of the water heater. Air is drawn in through the inlet louvres on the side of the water heater and then past the evaporator, where heat is transferred from the air to a refrigerant fluid. The fluid is compressed and passes to the condenser (heat exchanger) where heat is transferred into the water. The pump circulates water from the bottom of the storage tanks through the heat exchanger and the heated water is circulated back into the storage tanks. The fan discharges the cooled air through the fan grilles on the top of the water heater. This process continues until the water in the storage tanks reaches the set temperature.
Even on cold days, heat is drawn from the surrounding air. The heat pump will operate most efficiently at temperatures above 0°C and maximum of 45°C. The efficiency of the water heater is relative to the surrounding air temperature and the incoming water temperature.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.
AUXILIARY BOOST OPERATION The water heater can control an auxiliary heating source if the ambient temperature falls below 0oC or if 50% or more of the water heaters are in fault mode.
OPERATION AT LOW AMBIENT TEMPERATURE As the ambient temperature falls below 5oC, the controller will automatically set back the target set point, measured at the bottom of the storage tank, relative to the ambient temperature, to a value set as the minimum. The factory default minimum set back is 60oC which correlates to an ambient temperature of 0oC.
As the ambient temperature increases, the set point will increase accordingly until the normal set point is achieved. It is important to note that the sizing of the system ensures hot water is delivered to the building even though the bottom of the tank may be at a lower set point, and heating to above 60oC is ensured every day in accordance with AS 3498.
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HOW YOUR WATER HEATER WORKS
Setting back the target set point allows the heat pump to operate reliably at lower ambient temperatures.
Should the ambient temperature continue to fall below 0C, or the heat pump has operated below 5oC for a selected period of time, the heat pump will de- activate and activate auxiliary heating.
An auxiliary gas or electric water heater will be activated and will operate until the set point is reached or the air temperature reaches 5C.
OPERATION IN FAULT MODE If fitted, the auxiliary booster will operate instead of the heat pump if the heat pump is in fault.
For multiple heat pump (Master/Slave) configuration, the auxiliary booster will operate instead of the heat pumps if fifty percent (50%) or more heat pumps are in fault.
The auxiliary boost will operate until the set temperature is reached. The auxiliary boost should be set to 65°C.
Warning: Rheem will not be responsible for higher utility bills due to
excessive use of auxiliary boost heater. It is the customers’ responsibly to monitor the system regularly for its correct operation. Rheem recommends monitoring via BMS (modules supplied separately).
MAINS PRESSURE The water heater is designed to operate at mains pressure by connecting directly to the mains water supply. If the mains supply pressure in your area exceeds that shown on page 32, a pressure limiting valve must be fitted.
THERMAL CUT OUT The refrigeration circuit is protected by thermal sensors. These will activate a thermal cut out in the event of excessive heat in the refrigeration system.
If the thermal cut out has activated, the heat pump will not operate for a period of 20 minutes to 2 hours. The water heater will make two more attempts to start up. If the thermal cut out is tripped again after the third attempt, the system will enter lock out and the alarm contacts will close. If connected to a BMS, this will alert the user that the unit is not operating.
The lockout condition can be manually reset by switching the power to the water heater off and then on.
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HOW YOUR WATER HEATER WORKS
CONTROL FUNCTIONALITY A timer can be set through the heat pump control panel to limit the hours of operation of the water heater (e.g. to reduce noise at night). The operation of the heat pump can also be controlled by setting up tariff option on the control panel to manage operating costs. Note: depending on the booster configuration there may be insufficient stored energy available for the next peak period if the system is not up to temperature. Remember, even on cloudy and cold days your heat pump water heater will heat your stored water.
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HOW YOUR WATER HEATER WORKS
SUPERIOR MONITORING The A2W Heat Pump System is supplied with 9 sensors:
1. Tank temperature sensor 2. Building flow temperature sensor 3. Water inlet temperature sensor 4. Water outlet temperature sensor 5. Refrigerant suction side temperature (superheat) 6. Suction pressure transducer 7. Discharge pressure transducer 8. Ambient air temperature sensor 9. Evaporator coil sensor The output of these sensors are displayed on the user friendly control panel to ensure correct system operation.
The system can be connected to BMS. Modbus RS485 is provisioned on the controller for a single 15kW heat pump. Modbus RS485, BACnet MS-TP or BACnet TCP/IP Ethernet interface cards, supplied by Rheem, are required for any other configuration. Contact Rheem for further information on BMS.
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MAINTENANCE REQUIREMENTS

WARNING: THIS WATER HEATER CONTAINS LOW BURNING VELOCITY MATERIAL
MINOR MAINTENANCE EVERY SIX MONTHS It is recommended minor maintenance be performed every six (6) months. Minor maintenance can be performed by a responsible officer.
The minor maintenance includes:
· Operate the easing lever on the temperature pressure relief valve. It is very important the lever is raised and lowered gently. Refer to “Relief Valves” on page Error! Bookmark not defined..
Warning: Water discharged from the temperature pressure relief valve drain line will be hot. Exercise care to avoid any splashing of water by standing clear of the drain line’s point of discharge when operating the valve’s easing lever.
· Operate the easing lever on the expansion control valve (if fitted). It is very important the lever is raised and lowered gently. Refer to “Relief Valves” on page Error! Bookmark not defined..
· Check the condensate drain and safe tray drain (if one is installed) is not blocked.
ANNUAL SERVICE It is recommended the commercial heat pump be serviced annually, to retain optimum performance. Servicing must be performed by a suitably qualified person.
The annual service includes:
1. Check the sensors are fully installed into thermal wells. 2. Check for leaks at all fittings. 3. Check for signs of excessive corrosion on storage tank(s) jacket(s) and heat
pump casing. 4. Check for sludge build up and if necessary drain and flush storage tank(s). 5. Clear hot water pump impellor and ensure free rotation. 6. Check condensate drain for blockages ­ clear if necessary. 7. Clean blockages and debris from evaporator fins, fan blades, grilles and
louvres.
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8. Isolate power to heat pump and check all electrical connections for signs of overheating due to poor connection.
9. Check for vibration or excessive noise from compressor, fans and hot water pump.
10. Check refrigerant pressures and adjust refrigerant charge if required. 11. Visually check system for any potential problems. 12. Confirm correct system operation. 13. Operate temperature and pressure relief valve and expansion control valve.
Refer to page Error! Bookmark not defined.. FIVE YEAR SERVICE 1. As per annual service. 2. Inspect and if required, replace storage tank(s) anode(s). If the anode is not
replaced, it should be replaced within three years of this service. 3. Check operation of defrost solenoid valve by manually operating the valve. 4. Replace temperature and pressure relief valve or expansion control valve. Refer to Service manual for more information.
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WATER SUPPLIES

This water heater must be installed in accordance with this advice to be covered by the Rheem warranty.
This water heater is manufactured to suit the water conditions of most public reticulated water supplies. However, there are some known water chemistries which can have detrimental effects on the water heater and its operation and / or life expectancy. If you are unsure of your water chemistry, you may be able to obtain information from your local water supply authority. This water heater should only be connected to a water supply which complies with these guidelines for the Rheem’s warranty to apply.
CHANGE OF WATER SUPPLY The changing or alternating from one water supply to another can have a detrimental effect on the operation and / or life expectation of a number of components in this water heater.
Where there is a changeover from one water supply to another, e.g. a rainwater tank supply, bore water supply, desalinated water supply, public reticulated water supply or water brought in from another supply, then water chemistry information should be sought from the supplier or it should be tested to ensure the water supply meets the requirements given in these guidelines for the Rheem warranty to apply.
SATURATION INDEX The saturation index (SI) is used as a measure of the water’s corrosive or scaling properties.
Where the saturation index is less than ­1.0, the water is very corrosive and the Rheem warranty does not apply to the water heater. In a corrosive water supply, the water can attack copper parts and cause them to fail.
Where the saturation index exceeds +0.40, the water is very scaling and an expansion control valve* must be fitted on the cold water line after the non- return valve. The Rheem warranty does not apply to the water heater.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.

• Refer to the cold water connection detail on page 57.
  CHLORIDE AND PH In a high chloride water supply, the water can corrode stainless steel parts and cause them to fail. Where the chloride level exceeds 250 mg/L the Rheem warranty does not apply to the water heater if fitted with a brazed plate stainless steel heat exchanger.
  22

WATER SUPPLIES

Where the pH is less than 6.0 the Rheem warranty does not apply to the water heater. pH is a measure of whether the water is alkaline or acid. In an acidic water supply, the water can attack stainless steel parts and cause them to fail.
Water with a pH less than 6.0 may be treated to raise the pH. The water supply from a rainwater tank in a metropolitan area is likely to be corrosive due to the dissolution of atmospheric contaminants.
Where the Chloride and/or pH exceed the warranty limits for stainless steel, an optional copper tube in tube heat exchanger can be specified, subject to the Saturation Index being within warranty limits.

SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING THE RHEEM WARRANTY The water heater is not suitable for certain water chemistries. Those chemistries are listed below. If the water heater is connected at any time to a water supply with the following water chemistry, Rheem’s warranty will not cover any resultant faults:

Water Chemistry
Saturation Index (SI) < -1.0 Saturation Index (SI) > +0.4 Chloride > 250 mg/L pH < 6.0

Component
water heater (copper heat exchanger and parts) water heater (expansion control valve) water heater (stainless steel heat exchanger) water heater (stainless steel heat exchanger)

23

SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition or fault that is not related to manufacture or failure of a part.
NOT ENOUGH HOT WATER (OR NO HOT WATER)
· Is the electricity switched on? Inspect the isolating switch marked “HOT WATER” or “WATER HEATER” at the switchboard and the isolating switch at the water heater and ensure they are turned on.
Check the circuit breaker marked “HOT WATER” or “WATER HEATER” at the switchboard.
· Is the alarm light flashing RED on heat pump controller?
If the alarm light is flashing RED, check the alarm by pressing the alarm button. Phone your nearest Rheem Service Department or Accredited Service Agent (or Service Centre in NZ) to inform about the alarm. · Is the timer set? If the timer has been set, ensure sufficient time has been allowed to reheat the storage tanks. · Are you using more hot water than you think? Are outlets (especially the showers) using more hot water than you think? Very often it is not realised the amount of hot water used, particularly when showering. Carefully review the hot water usage. Have your plumber install a flow control valve to each shower outlet to reduce water usage.
24

· Heat pump circulator has failed? The heat pump will not operate if the heat pump circulator has failed. Refer to “Heat Pump Is Not Operating” on page 25 . Phone your nearest Rheem Service Department or Accredited Service Agent to arrange for an inspection.
· Water heater size Do you have the correct size water heater for your requirements? The sizing guide in the sales literature and on the Rheem website (www.rheem.com.au or www.rheem.co.nz) suggest average sizes that may be needed.
· Air temperature is cold ­ defrost mode The heat pump will enter a defrost mode when ice is sensed on the evaporator coil. The recovery rate of the heat pump is reduced in due to the lower operating air temperature and heating of water is reduced during the defrost cycle.
WATER TOO HOT The water heater, during both normal heat pump operation and auxiliary booster operation (optionally activated during periods of low ambient temperatures, or heat pump fault), will heat the water to a temperature of 60°C to 65°C. It is recommended to set the auxiliary booster thermostat setting to 65°C.
WATER NOT HOT ENOUGH You may find that due to heavy hot water usage the water temperature may be lower than normally expected, due to insufficient heating time being allowed. Additional storage or an in series booster may be required to be installed under these circumstances.
HEAT PUMP IS NOT OPERATING · Ambient temperature is cold­ auxiliary boost mode
If the ambient temperature drops below 5oC for a specified period of time or drops below 0oC, the heat pump will turn off and the auxiliary water heater, if installed, will operate instead. The storage tank will be heated to the set point during these periods. Auxiliary boost will turn OFF and heat pump will start operating as normal when air temperature increases to 5°C or higher.
· Thermal cut out activated Has the thermal cut out for the heat pump compressor activated?
If the thermal cut out has activated, the heat pump will not operate for a period of 20 minutes to 2 hours and display alarm on the control panel. The water heater will make two more attempts to start. If the thermal cut out is tripped again after the third attempt, the system will enter lock out. If connected to a BMS, this will alert the user that the unit is not operating.
25

To check whether there may be a problem, switch the power to the water heater off and on again at the circuit breaker to the water heater, then open a hot tap and allow to run for ten to fifteen minutes. The heat pump, if working properly, will activate and continue operating to heat the water. Close the hot tap when the heat pump begins to operate. However, if the heat pump deactivates within five minutes, there may be a problem. Phone your nearest Rheem Service Department or Accredited Service Agent (or Service Centre in NZ) to arrange for an inspection. · Incorrect Phase Rotation The phase fail relay will open circuit if the heat pump has been wired with incorrect phase rotation or if a phase has failed. Both green and yellow LEDs on the relay will be illuminated if all phases are available and phase rotation is correct. · Heat pump circulator has failed If the heat pump circulator has failed, the heat pump will not operate and may trip on a fault. Phone your nearest Rheem Service Department or Accredited Service Agent (or Service Centre in NZ) to arrange for an inspection.
26

HIGH ELECTRICITY BILLS With the installation of your new air sourced heat pump water heater, maximum electrical energy savings can be achieved. Should you at any time, feel your energy account is too high, we suggest you check the following points: · Is the relief valve in the storage tanks running excessively? · Are outlets (especially the showers)
using more hot water than you think? (Refer to “Not Enough Hot Water” on page 24). · Is there a leaking hot water pipe, dripping hot water tap, etc? Even a small leak will waste a surprising quantity of hot water and energy. Replace faulty tap washers, and have your plumber rectify any leaking pipe work. · Consider recent changes to your hot water usage pattern and check if there has been any increase in tariffs since your previous account. · The heat pump water heater operates at its most efficient at higher air temperatures. Prolonged periods of low ambient temperature will decrease the efficiency of the system and increase running costs.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE, CALL YOUR NEAREST RHEEM SERVICE DEPARTMENT OR ACCREDITED SERVICE AGENT.
27

INSTALLATION

THIS WATER HEATER IS FOR INDOOR OR OUTDOOR INSTALLATION, MODEL DEPENDENT AND SUBJECT TO AN ADEQUATE SUPPLY OF FRESH AIR.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
INSTALLATION STANDARDS The water heater must be installed:
· by a qualified person, and
· in accordance with the installation instructions, and
· in compliance with the Plumbing Code of Australia (PCA), Standards AS/NZS 3500.4, AS/NZS 3000, AS/NZS 60335.2.40-2019 and/or ISO 5149.3-2014 and all local codes and regulatory authority requirements.
· in New Zealand also conforming to Clauses G12 and H1 of the New Zealand Building Code.
Warning: This water heater may deliver water at high temperature. Refer to the Plumbing Code of Australia, local requirements and these installation instructions to determine if additional delivery temperature control is required. Refer to “Hot Water Delivery” on page 33. All packaging materials must be removed from the water heater prior to its installation.
WATER HEATER APPLICATION This water heater is designed for the purpose of heating potable water. Its use in an application other than this may shorten its life
If this water heater is to be used where an uninterrupted hot water supply is necessary for the application or business, then there should be redundancy within the hot water system design. This should ensure the continuity of hot water supply in the event that this water heater was to become inoperable for any reason. We recommend you provide advice to the system owner about their needs and building backup redundancy into the hot water supply system.
Note: Australian Standard AS 3498 and New Zealand Building Code Clause G12 require that a water heater provides the means to inhibit the growth of Legionella bacteria in potable water. This water heater can satisfy these AS 3498 and Clause G12 requirements provided it is energised and the thermostat setting is 60°C or higher, including when it is used as an in-series booster water heater for a solar water heater.
28

INSTALLATION
COMPONENTS The heat pump water heater system is modular and comprises three main components: the heat pump water heater, storage tanks and primary circulator. An auxiliary booster and/or circulator may also be employed as part of the system. The water heater must not be operated until all components are assembled.
Do not tilt the heat pump more than 45° from the vertical. This will unsettle the refrigerant gas and compressor lubricating oil. If the heat pump has been tilted more than 45° from the vertical during handling, it will need one hour to settle before the power to the water heater can be switched on, otherwise damage to the compressor may result.
If the heat pump is tilted whilst conveying it on stairs, the compressor must be braced adequately to prevent undue strain being applied to the piping and feet.
INDOOR INSTALLATION This heat pump uses R1234yf which has a global warming potential of <1. It is an A2L refrigerant, classified as mildly flammable with low burning velocity material.
The flow chart on page 30 is provided as a guidance, as it applies to this water heater, for compliance with AS/NZS 60335.2.40-2019 and/or ISO 5149.3-2014, and as such cannot cover all requirements of the standards. Room area, volume and ventilation requirements are the limits required to comply with the standards with regard to A2L refrigerants.
In accordance with the standards, the requirements are calculated based on the largest single refrigeration circuit in the building, and not the cumulative refrigerant contained in multiple heat pump circuits.
For an Air to Water heat pump, separate ventilation requirements apply for good performance. Refer to page 49.
29

INSTALLATION

A2L Room Ventilation Requirements

A2L ROOM VENT REQUIREMENTS
START

What is heat pump location?

Outdoors

No A2L room ventilation requirements apply.

Indoors Is heat pump room
area > 50 m2? NO
Is heat pump in lowest underground
room?
NO
Is there an underground room?
YES Is lowest underground room volume 37.5 m3?
NO

YES

· No A2L room ventilation requirements apply, however the maximum number of heat pumps per room must not be exceeded which is 26 for 015 models and 13 for 030 models.

YES

Is heat pump room volume 37.5 m3?

NO NO YES

YES

Does heat pump room have
minimum free air ventilation? (1)
NO

YES

A2L room ventilation requirements satisfied.

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated/monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated and monitored. Also refer notes (2) and (3).
· The room in which the heat pump is installed must be monitored by a refrigerant detector. If activated, the detector must shut down the compressor(s) and provide an alarm in accordance with IS0 5149-3:2014.

Does heat pump room have
minimum free air ventilation? (1)
NO

YES

A2L room ventilation requirements satisfied.

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated and monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).

Does heat pump room have
minimum free air ventilation? (1)

YES

· Mechanical ventilation/circulation airflow must be provided to lowest underground room (not heat pump room). The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated/monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated and monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).
NO · Mechanical ventilation/circulation airflow must also be provided to lowest underground room. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated/monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).
Notes:
(1) Minimum free air ventilation is 0.078 m2 (must be 780 mm wide x 200 mm high minimum vent with 50% free air openings) located with the bottom of the vent no higher than 100 mm from the floor, and the top of the vent no higher than 300 mm from the floor. A second opening of 0.039 m2 free air ventilation (e.g. 300 mm x 300 mm vent with 50% free air openings) shall be located between 1.5 m and 2.2 m from the floor.
(2) The airflow reaching height shall not exceed 2.2 m (measured from floor to top of ventilation/circulation fan or top of airflow ventilation opening).
(3) If the airflow rate falls below the minimum airflow rate, the compressor(s) must be shut down within 10 seconds and an alarm must be activated to warn the user that the airflow is reduced. This is typically achieved by one of the following methods: · By a BMS monitoring system connected to the heat pump. · By a sail or pressure switch connected to an alarm system and the heat pump `Remote ON/OFF’ terminal block (240 VAC input = ON).

30

INSTALLATION
WATER HEATER LOCATION 953 series models are designed to be installed outdoors. Indoor installation is allowable if the requirements of the flow chart on page 30 are met, a sufficient supply of heat energy is available and adequate ventilation for efficient operation is provided.
Good performance is obtained when the heat pump is supplied with a constant supply of fresh air. Failure to observe the above recommendations may lead to lower than expected performance or problematic operation of the heat pump.
952 series models are designed for ducting of discharge air in indoor installations.
The water heater should be installed close to the storage tanks and its position chosen with noise, safety and service in mind. Make sure the air inlet and fan outlet grilles are clear of obstructions and shrubbery and they are unlikely to be touched by people (especially children).
It is advisable to install the water heater away from bedroom or living room windows as the system can generate a noise of up to 69dBA (at 3 metres from the water heater) whilst operating.
It is recommended the water heater be installed at ground or floor level. Stacked units with base unit at ground or floor level is acceptable from a servicing perspective.
The water heater must stand vertically upright.
Note: to assist with condensate drainage, the heat pump has a 2.5 degrees slope towards the drains. Do not level the product.
Clearance must be allowed for servicing of the water heater. Refer to page 45 for clearance data. The water heater must be accessible without the use of a ladder or scaffold.
You must be able to read the information on the rating plate. Remember you may have to remove the entire water heater later for servicing.
The water heater must not be installed in an area with a corrosive atmosphere where chemicals are stored or where aerosol propellants are released. Remember the air may be safe to breathe, but the chemicals may attack the materials used in the heat pump system.
31

INSTALLATION

SAFE TRAY Under certain installation conditions where damage to property can occur in the event of the water heater leaking AS/NZS 3500.4 requires the water heater be installed in a safe tray. Construction, installation and draining of a safe tray must comply with AS/NZS 3500.4 and all local codes and regulatory authority requirements. In New Zealand the safe tray must also meet the requirements of Clause G12 of the New Zealand Building Code. AS/NZS 3500.4 and the NZBC also have particular requirements when a safe tray must be installed.
Alternatively, where additional leak protection is required for installations not defined by AS/NZS 3500.4, a suitable bund may be constructed to surround the water heater in lieu of using a safe tray.
TANK WATER SUPPLY If the storage tank is supplied with water from a tank supply and a pressure pump system is not installed, then the bottom of the supply tank must be at least 1 m above the highest point of the hot water plumbing system, including the storage tank. Care must be taken to avoid air locks. The cold water line to the storage tank should be adequately sized and fitted with a full flow gate valve or ball valve.
MAINS WATER SUPPLY Where the mains water supply pressure exceeds that shown in the table below, an approved pressure limiting valve is required and should be fitted as shown in the installation diagram (refer to diagram on page 57).

Relief valve setting (VE/610 Series storage tanks) Expansion control valve setting Relief valve setting (SS/RT Series storage tanks) Expansion control valve setting Relief valve setting (SS/RW Series storage tanks) Expansion control valve setting Max supply pressure (VE/610 Series storage tanks)
Without expansion control valve With expansion control valve Max supply pressure (SS/RT Series storage tanks) Without expansion control valve With expansion control valve Max supply pressure (SS/RW Series storage tanks) Without expansion control valve With expansion control valve Expansion control valve not supplied with the water heater.

1000 kPa 850 kPa 850kPa 700 kPa 700kPa 550kPa
800 kPa 680 kPa
680 kPa 550 kPa
550 kPa 450 kPa

32

INSTALLATION
HOT WATER DELIVERY This water heater can deliver water at temperatures which can cause scalding. It is necessary and we recommend that a temperature limiting device be fitted between the storage tanks and the hot water outlets in any ablution area such as a bathroom or ensuite, to reduce the risk of scalding. The installing plumber may have a legal obligation to ensure the installation of this water heater system meets the delivery water temperature requirements of AS/NZS 3500.4 so that scalding water temperatures are not delivered to a bathroom, ensuite or other ablution area. Where a temperature limiting device is installed adjacent to the storage tanks, the cold water line to the temperature limiting device can be branched off the cold water line either before or after the isolation valve, pressure limiting valve and non return valve to the water heater system. If an expansion control valve is required, it must always be installed after the non return valve and be the last valve prior to the storage tanks.
Two Temperature Zones Using a Temperature Limiting Device
If a pressure limiting valve is installed on the cold water line to the water heater system and the cold water line to a temperature limiting device branches off before this valve or from another cold water line in the premises, then a pressure limiting valve of an equal pressure setting may be required prior to the temperature limiting device. CIRCULATED HOT WATER FLOW AND RETURN SYSTEM This heat pump water heater may be installed as part of a circulated hot water flow and return system in a building as long as a temperature boosting water heater is not installed downstream of the heat pump.
33

INSTALLATION
If a temperature boosting water heater is installed the circulated hot water flow and return system must return to the inlet of the temperature boosting water heater, and not the heat pump, to avoid potential nuisance tripping. Refer to the diagram on page 37.
A 3-way valve may be used to divert circulated hot water flow and return between the boosting water heater and the heat pump storage depending on the temperature in the heat pump storage tank. Consult Rheem Technical Sales for more information.
Temperature Limiting Device A temperature limiting device cannot be installed in circulated hot water flow and return pipe work unless the device is designed for such application, such as Rheem Guardian. The tempered water from a temperature limiting device cannot be circulated. Where a circulated hot water flow and return system is required in a building, a temperature limiting device can only be installed on a dead leg, branching off the circulated hot water flow and return pipe.
If circulated tempered water were to be returned back to the water heater, depending on the location of the return line connection on the water supply line to the water heater, then either:
· water will be supplied to the cold water inlet of the temperature limiting device at a temperature exceeding the maximum recommended water supply temperature, or
· when the hot taps are closed no water will be supplied to the cold water inlet of the temperature limiting device whilst hot water will continue to be supplied to the hot water inlet of the temperature limiting device.
These conditions may result in either water at a temperature exceeding the requirements of AS/NZS 3500.4 being delivered to the hot water outlets in the ablution areas, or the device closing completely and not delivering water at all, or the device failing. Under either condition, the operation and performance of the device cannot be guaranteed.
INSULATION To minimise heat loss and provide protection from freezing, the cold water line to and the hot water line from the heat pump water heater must be insulated in accordance with the requirements of AS/NZS 3500.4. The insulation must be weatherproof and UV resistant if exposed.
34

INSTALLATION
SADDLING – PIPE WORK To prevent damage to the heat pump and storage tanks when attaching pipe clips or saddles to the water heater jacket, we recommend the use of self-drilling screws with a maximum length of 12 mm. Should pre drilling be required, extreme caution must be observed when penetrating the jacket of the water heater. Avoid drilling or saddling in the vicinity of the evaporator coil. The coil and refrigerant circuit are in close proximity to the jacket and rupturing of the refrigerant circuit may occur. Note: If the heat pump is damaged as a result of attaching pipe clips or saddling to the jacket, any resultant faults will not be covered by the Rheem warranty.
35

INSTALLATION
Typical A2W Heat Pump Installation with Recirculation
36

INSTALLATION
Typical A2W Heat Pump Installation with Inline Boost
37

INSTALLATION
Typical A2W Heat Pump Installation with Low Ambient Air Boost- Dead Leg System
38

INSTALLATION
Typical A2W Heat Pump Installation with Guardian Warm Water
39

INSTALLATION
Typical A2W Heat Pump Installation with Inline Boost, Low Ambient Air Boost Hot Water Recirculation & Warm Water
40

INSTALLATION

Dimensions and Technical Data- 15kW Models
RHEEM A2W 15kW- Non-ducted Vertical Discharge 95301500/9530150V

RHEEM A2W 15kW- Ducted Vertical Discharge 95201500/9520150V

41

INSTALLATION

RHEEM A2W 15kW- Non-ducted Horizontal Discharge 953015H0/953015HV

RHEEM A2W 15kW- Ducted Horizontal Discharge 952015H0/952015HV

42

INSTALLATION

Dimensions and Technical Data- 35kW Models
RHEEM A2W 30kW- Non-ducted Vertical Discharge 95303000/9530300V

RHEEM A2W 30kW- Ducted Vertical Discharge 95203000/9520300V

43

INSTALLATION

RHEEM A2W 30kW- Non-ducted Horizontal Discharge 953030H0/953030HV

RHEEM A2W 30kW- Ducted Horizontal Discharge 952030H0/952030HV

44

INSTALLATION

CLEARANCES- AIR TO WATER HEAT PUMP MODELS

Sides

Unit

Evap Coil Side

mm

Back (vertical discharge models)

mm

Back (horizontal discharge models) mm

Display Side

mm

Water Connections Side

mm

Top (vertical discharge models)

mm

Top (horizontal discharge option)

15kW Models

30kW Models

350

500

Nil

Nil

1200

2000

850

850

600

600

1200

2000

Clearance above unit required for service personnel to stand

45

HEAT PUMP AND TANK ASSEMBLY

HEAT PUMP AND STORAGE TANKS The heat pump water heater system is modular and comprises three main components: the heat pump water heater, storage tanks and primary circulator. An auxiliary booster and/or circulator and/or 3 way valve may also be employed as part of the system. The water heater must not be operated until all components are assembled. HEAT PUMP Locate the heat pump(s) in the appropriate position observing the required clearances for operation and servicing. Refer to page 45. Indoor Installations This heat pump uses R1234yf which has a global warming potential of <1. It is an A2L refrigerant, classified as mildly flammable with low burning velocity material. The flow chart on page 47 is provided as a guidance, as it applies to this water heater, for compliance with AS/NZS 60335.2.40-2019 and/or ISO 5149.3-2014, and as such cannot cover all requirements of the standards. Room area, volume and ventilation requirements are the limits required to comply with the standards with regard to A2L refrigerants. In accordance with the standards, the requirements are calculated based on the largest single refrigeration circuit in the building, and not the cumulative refrigerant contained in multiple heat pump circuits. For an Air to Water heat pump, separate ventilation requirements apply for good performance. Refer to page 49.
46

HEAT PUMP AND TANK ASSEMBLY

A2L Room Ventilation Requirements

A2L ROOM VENT REQUIREMENTS
START

What is heat pump location?

Outdoors

No A2L room ventilation requirements apply.

Indoors Is heat pump room
area > 50 m2? NO
Is heat pump in lowest underground
room?
NO
Is there an underground room?
YES Is lowest underground room volume 37.5 m3?
NO

YES

· No A2L room ventilation requirements apply, however the maximum number of heat pumps per room must not be exceeded which is 26 for 015 models and 13 for 030 models.

YES

Is heat pump room volume 37.5 m3?

NO NO YES

YES

Does heat pump room have
minimum free air ventilation? (1)
NO

YES

A2L room ventilation requirements satisfied.

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated/monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated and monitored. Also refer notes (2) and (3).
· The room in which the heat pump is installed must be monitored by a refrigerant detector. If activated, the detector must shut down the compressor(s) and provide an alarm in accordance with IS0 5149-3:2014.

Does heat pump room have
minimum free air ventilation? (1)
NO

YES

A2L room ventilation requirements satisfied.

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated and monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).

Does heat pump room have
minimum free air ventilation? (1)

YES

· Mechanical ventilation/circulation airflow must be provided to lowest underground room (not heat pump room). The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated/monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).

· Mechanical ventilation/circulation airflow must be provided to the room in which the heat pump(s) is installed. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated and monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).
NO · Mechanical ventilation/circulation airflow must also be provided to lowest underground room. The airflow rate must be 167 m3/hr (601 L/sec) and be continuously operated/monitored or initiated by a refrigerant detector in accordance with IS0 5149-3:2014. Also refer notes (2) and (3).
Notes:
(1) Minimum free air ventilation is 0.078 m2 (must be 780 mm wide x 200 mm high minimum vent with 50% free air openings) located with the bottom of the vent no higher than 100 mm from the floor, and the top of the vent no higher than 300 mm from the floor. A second opening of 0.039 m2 free air ventilation (e.g. 300 mm x 300 mm vent with 50% free air openings) shall be located between 1.5 m and 2.2 m from the floor.
(2) The airflow reaching height shall not exceed 2.2 m (measured from floor to top of ventilation/circulation fan or top of airflow ventilation opening).
(3) If the airflow rate falls below the minimum airflow rate, the compressor(s) must be shut down within 10 seconds and an alarm must be activated to warn the user that the airflow is reduced. This is typically achieved by one of the following methods: · By a BMS monitoring system connected to the heat pump. · By a sail or pressure switch connected to an alarm system and the heat pump `Remote ON/OFF’ terminal block (240 VAC input = ON).

47

HEAT PUMP AND TANK ASSEMBLY
WATER HEATER LOCATION 953 series models are designed to be installed outdoors. Indoor installation is allowable if the requirements of the flow chart on page 47 are met, a sufficient supply of heat energy is available and adequate ventilation for efficient operation is provided.
Good performance is obtained when the heat pump is supplied with a constant supply of fresh air. Failure to observe the above recommendations may lead to lower than expected performance or problematic operation of the heat pump.
952 series models are designed for ducting of discharge air in indoor installations.
The water heater should be installed close to the storage tanks and its position chosen with noise, safety and service in mind. Make sure the air inlet and fan outlet grilles are clear of obstructions and shrubbery and they are unlikely to be touched by people (especially children).
It is advisable to install the water heater away from bedroom or living room windows as the system can generate a noise of up to 69dBA (at 3 metres from the water heater) whilst operating.
It is recommended the water heater be installed at ground or floor level. Stacked units with base unit at ground or floor level is acceptable from a servicing perspective.
The water heater must stand vertically upright.
Note: to assist with condensate drainage, the heat pump has a 2.5 degrees slope towards the drains. Do not level the product.
Clearance must be allowed for servicing of the water heater. Refer to page 45 for clearance data. The water heater must be accessible without the use of a ladder or scaffold.
You must be able to read the information on the rating plate. Remember you may have to remove the entire water heater later for servicing.
The water heater must not be installed in an area with a corrosive atmosphere where chemicals are stored or where aerosol propellants are released. Remember the air may be safe to breathe, but the chemicals may attack the materials used in the heat pump system.
48

HEAT PUMP AND TANK ASSEMBLY

Ventilation The heat pump draws fresh air at a rate of 1.97m3/s for 15kW model and 3.75m3/s for 30kW model. Louvres can provide a significant pressure drop which can impede sufficient air flow both in and out of the plant room. Refer to the table on page 49 for the maximum static pressure of the fans depending on the model selected. This can be used in conjunction with louvre specifications to determine the minimum free ventilation area required for inlet and outlet.

In the absence of specification data, the minimum recommended free air ventilation requirement per heat pump is as below:

Model 15kW Heat Pump 30kW Heat Pump

Inlet 2m2 4m2

Outlet 2m2 4m2

Notes: A heat pump is similar in operation to that of an air conditioner and relies on a constant supply of fresh heat energy via air flow to operate efficiently.

As air is drawn across the evaporator coils, heat is extracted, and the expelled air is cooled. Just as hotter air rises so does colder air fall. This may mix with the incoming air supply to dilute the temperature and affect heat pump performance.

It is important to ensure there is cross flow of ventilation, especially if installed within a plant room.

Ducted Models The exhaust air duct must be constructed so that it covers both fans. A spigot is provided on ducted models to facilitate ductwork connection. The maximum static pressure in the ductwork and at the discharge point must not exceed the values stated in the table below.

Maximum Static Pressure

15kW Heat Pump

30kW Heat Pump

Ducted

Non ducted

Ducted

Non ducted

952015

953015

952030

953030

63Pa

11Pa

37Pa

5Pa

49

HEAT PUMP AND TANK ASSEMBLY

Horizontal Ducting (Vertical Discharge Model) If ducting horizontally, the transition from vertical to horizontal should be radiused (r) with a ratio of 2:1 in relation to the length (H) or depth (W) of the heat pump, depending on direction of duct, measured from the centre of the appliance.

It is recommended to terminate the ducting with bird mesh as this provides the least pressure resistance to the fans against air flow.

EXAMPLE: HEAT PUMP SPIGOT DEPTH `W’ = 521mm
“r” AT RATIO 2:1 = 1042mm

If louvres are to be used, the pressure loss at the louvre in Pascals determined for the duct velocity in m3/sec/m2 must be calculated in conjunction with the duct size, length and number of bends to not exceed that shown in the table on page 49 .

The duct should have a slight fall away from the heat pump and the terminal face be tapered downwards to prevent water ingress.

Vertical Ducting (Vertical Discharge Model) If ducting vertically, the duct must terminate above the roof level and have a free ventilation outlet area equivalent to the spigot dimensions per heat pump. It is recommended to terminate the duct with bird mesh as this provides the least pressure resistance to the fans against air flow. Adequate weather protection must be provided to prevent water ingress.

Note: whilst water ingress does not affect heat pump operation, the heat pump may not adequately drain away any water due to rain, leading to undesirable spillage within the plant room area.

Horizontal Fan Option If a horizontal discharge fan option has been selected, the same rules apply to location of installation as for ducted and non-ducted models, depending on which has been ordered.

Horizontal fan models are designed to be stacked two high to reduce footprint as shown in the diagram below.

50

HEAT PUMP AND TANK ASSEMBLY
STORAGE TANKS Rheem Commercial storage tanks are employed to store the hot water generated by the heat pump. The tanks must be manifolded using the Equa- Flow® manifold system to ensure even distribution of the stored energy. Up to ten tanks can be manifolded together in a single bank. More than one bank can be used. Follow the diagram on page 55 when manifolding the tanks. Refer to the installation instructions supplied with the storage tanks for specific information relating to the installation of the storage tanks. PRIMARY CIRCULATOR Each heat pump requires a primary circulator to ensure the correct flow rate and temperature rise is achieved. Where more than one heat pump is installed the common manifold must be installed using the Equa-Flow® manifold system and must be sized to accommodate the total flow of all the primary pumps running simultaneously. Refer to table below for minimum (ID) pipe sizing. The designed primary pump per 15kW model is Grundfos model CM3-2 and per 30kW model is CM10-1. Refer to installation manuals supplied with pumps. If another pump has been supplied, consult Rheem before continuing with the installation.
51

HEAT PUMP AND TANK ASSEMBLY

A2W H A2W HP 15kW

No. Heat Pumps in Parallel

1

2

3

4

Pump

Grundfos CM3-2

Branch Size (mm)

40

Header Size (mm) 40 50 65 80

A2W HP 30kW

No. Heat Pumps in Parallel

1

2

3

4

Pump

Grundfos CM10-1

Branch Size (mm)

50

Header Size (mm) 50 80 100 100

Header pipe sizing is based on one pump per heat pump with a total length of 40m of primary flow and return piping and 20 x 90o bends, excluding Equa-flow manifolds on storage tanks and heat pumps, at 1.2m/sec velocity. If this specification is exceeded consult Rheem before continuing with the installation.

Multiple heat pumps MUST be installed using Equa-Flow® principles to ensure the demand on each heat pump (or storage tank) in the bank is the same as any other. To achieve this, the following is necessary:
1. The inlet manifolds must be designed to balance the flow to each heat pump i.e. each branch line must be the same diameter and length.
2. The outlet manifold must be designed to balance the flow from each heat pump i.e. each branch line must be the same diameter and length.
3. The first heat pump in must be the last heat pump out. Note: Inlet and outlet water isolation valves MUST be installed at each heat pump to enable each heat pump to be individually isolated for servicing. The inlet isolation valve MUST be installed before the pump to also enable the pump to be isolated for servicing. Note: non-return valves are NOT required after the pumps.

AUXILIARY WATER HEATER It may be necessary to install an auxiliary water heater under the following conditions:

· If the ambient temperature is likely to drop below 5oC during periods when heating may be required.

· To ensure sufficient hot water is available for higher than expected peak conditions.

· If higher temperature water is required for certain applications, eg commercial laundry or kitchen.

The configuration of the auxiliary water heating plant can vary depending on the requirements of the individual installation.

52

HEAT PUMP AND TANK ASSEMBLY
Low Ambient Temperature Heating Only – Where the auxiliary water heater is required to be activated due to low ambient conditions, the heat pump can activate an auxiliary heater or pump. There are many configurations depending on system design. Refer to Application Guide for details on the auxiliary boost function designed for this system. In Line Boosting Only – Where the auxiliary water heater is required to ensure sufficient hot water is available for periods after the main peak or to boost the temperature of the water produced by the heat pump for other purposes (eg high temperature for kitchen and laundry use), an auxiliary water heater must be installed in-series with the storage tanks. ie, the hot water outlet from the storage tanks must feed into the inlet of the auxiliary water heater(s). Note: Where RT and RW storage tanks are used, boosting in the top portion of the storage tank is equivalent to boosting in series. Where multiple auxiliary water heaters are required to be manifolded together, these must be manifolded using the Equa-Flow® manifold system and the manifold in-series with the storage tanks. Refer to page 55. This arrangement can also be adapted to include recirculation heat loss make up and / or low ambient temperature activation heating. Refer to Application Guide for options.
53

MANIFOLD INSTALLATIONS
The Rheem commercial heat pump water heater is designed to be installed with storage tanks on a single manifold or multiple manifolds if required, using the Rheem Equa-Flow® manifold system. The Equa-Flow principle will function with water heaters in line, around a corner or in rows back to back (refer to the diagrams on pages 55 to 56).
The cold water, primary flow and hot water manifolds must be designed to balance the flow from each water heater and storage tank. To achieve this, there are basic installation requirements and principles which must be followed:
1. The maximum number of storage tanks in a bank should be 10, however several banks of storage tanks can be installed.
2. The hot water line from the manifold must leave from the opposite end to which the cold water line enters the manifold.
3. The storage tanks must be of the same model.
4. The cold water line, cold and hot headers and hot water line must be sized to meet the requirements of both AS/NZS 3500.4 and the application.
5. A non-return valve, isolation valve and if required a pressure limiting valve and expansion control valve, must be installed on the cold water line to the system.
6. A full flow gate valve or ball valve (not a stop tap, as used on a single water heater installation) must be installed on both the cold water branch and hot water branch of each water heater and storage tank.
7. Non return valves or pressure limiting valves MUST NOT be installed on the branch lines to the water heaters or storage tanks.
8. All fittings, valves and branch lines must be matched sets all the way along the manifold.
9. Sufficient space must be left to enable access, servicing or removal of any water heater or storage tank.
10. The temperature pressure relief valve drain line from each storage tank can terminate at a common tundish (funnel) with a visible air break at each drain discharge point.
54

MANIFOLD INSTALLATIONS
Manifold Arrangement
HOT WATER FLOW
Hot Manifold Assembly

FLOW FROM HEAT PUMPS

Primary Hot Water Flow Manifold Assembly
RETURN TO HEAT PUMPS

Cold Manifold Assembly
55

MANIFOLD INSTALLATIONS

In Line Manifold

Angle Manifold

Back to Back Manifold

NOTES:

Minimum recommended space between wall and back of water heater is 100 mm.

A minimum of 900 mm (E & F) should be left in front of the water heater for access, servicing and water heater removal.

Installation Layout Minimum Dimensions

Model

A

B

C

D

E *

F *

610 430 935 685 300 100 1685 900

RT/RW 1000 1250 1000 300 100 2100 1000

RT/RW 2000 1550 1300 300 100 2700 1300

RT/RW 3000
RT4000 RT5000

1700 1450 300 1850 1600 300 2050 1800 300

100 3000 1450 100 3300 1600 100 3700 1800

INSTALLATION DIMENSIONS ­ MULTIPLE RHEEM STORAGE TANKS

56

CONNECTIONS ­ PLUMBING

CONNECTION SIZES

Model Heat pump water heater inlet connection Heat pump water heater outlet connection Condensate drain connection

15kW

30kW

R1¼ BSPM

R2 BSPM

R1¼ BSPM

R2 BSPM

20mm O.D

All plumbing work must be carried out by a qualified person and in accordance with the Plumbing Standard AS/NZS 3500.4 and local authority requirements.

WATER INLET AND OUTLET
The pipe work must be cleared of foreign matter before connection and purged
before attempting to operate the water heater. All olive compression fittings must
use brass or copper olives. Use thread sealing tape or approved thread sealant
on all screwed fittings.

An isolation valve and non-return
valve must be installed on the cold
water line to the water heater system.
An acceptable arrangement is shown in the diagram. Refer also to “Hot Water Delivery” on page 33 and to “Mains Water Supply” on page 32.

Disconnection unions are required at the cold water inlet and hot water outlet on the water heater to allow for disconnection of the water heater.

PIPE SIZES To achieve true mains pressure operation, the cold water line to the storage tanks should be the same size or bigger than the hot water line from the storage tanks.

The pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing the most suitable pipe size for each individual application. Reference to the technical specifications of the water heater and local regulatory authority requirements must be made.

Refer to the table on page 51 for correct primary flow and return pipe sizing.

RELIEF VALVE The heat pump is supplied with an integral pressure relief valve located on the inside of the heat pump cabinet and will discharge into the tray of the heat pump. Refer to Condensate Drain on page 58 for drainage instructions.

57

CONNECTIONS – PLUMBING
EXPANSION CONTROL VALVE Local regulations may make it mandatory to install an expansion control valve (ECV) in the cold water line to the water heater system. In other areas, an ECV is not required unless the saturation index is greater than +0.4 (refer to “Water Supplies” on page 22). However, an ECV may be needed in a corrosive water area where there are sufficient quantities of silica dissolved in the water. The expansion control valve must always be installed after the non return valve and be the last valve installed prior to the water heater system (refer to diagram on page 54).
EXPANSION CONTROL VALVE DRAIN A copper drain line must be fitted to the relief valve to carry the discharge clear of the water heater. Connect the drain line to the relief valve using a disconnection union. The pipe work from the relief valve to the drain should be as short as possible and fall all the way from the water heater with no restrictions. It should have no more than three right angle bends in it. Use DN15 pipe. The outlet of the drain line must be in such a position that flow out of the pipe can be easily seen (refer to AS/NZS 3500.4) – but arranged so hot water discharge will not cause injury, damage or nuisance. The drain line must discharge at an outlet or air break not more than 9 metres from the relief valve. In locations where water pipes are prone to freezing, the drain line must be insulated and not exceed 300 mm in length. In this instance, the drain line is to discharge into a tundish through an air gap of between 75 mm and 150 mm.
CONDENSATE DRAIN A drain line must be fitted to the condensate drains to carry the discharge clear of the water heater. The drain line can be extended using 20 mm O.D. rigid hose or conduit. Where installed externally, the drain line pipe work must be UV resistant or protected from sunlight. The outlet of the drain line must be in such a position that flow out of the pipe can be easily seen – but arranged so water discharge will not cause damage or nuisance. The water heater is supplied with fall and t is recommended to install the water heater with a slight fall towards the condensate drain.
The condensate drain must not be connected to the pressure relief or expansion control valve drain line but may discharge at the same point.
58

CONNECTIONS ­ ELECTRICAL
The power supply to the water heater must not be switched on until the water heater is filled with water and a satisfactory megger reading is obtained.
Megger Reading
When a megger test is conducted on this water heater, then the following should be noted.
Warning: This water heater contains electronic equipment and 500 V insulation tests must only be conducted between actives and earth and between neutral and earth. An active to neutral test WILL damage the electronics.
An insulation test result of above 1 M should be obtained for this water heater.
Electrical Connection
All electrical work and permanent wiring must be carried out by a qualified person and in accordance with the Wiring Rules AS/NZS 3000 and local authority requirements.
Heat Pump
The heat pump water heater must be directly connected to a 380-415 V AC 50 Hz mains power supply. The heat pump must be on its own circuit with an appropriately sized circuit breaker and isolating switch installed at the switchboard. A secondary isolating switch must be installed within reach of the water heater.
If the heat pump is installed within a machinery room, as defined by ISO 5149.1-2014 (ie where mechanical ventilation is used), then a remote emergency isolation switch in accordance with ISO 13850 and IEC 60204.1 must be additionally installed outside the machinery room and at a suitable location within the machinery room.
A conduit is required for the electrical cable to the heat pump water heater. The conduit is to be connected to the unit with a 20mm terminator. Holes are provided on the electrical panel for cabling. Connect the power supply and earth wires directly to the terminal block, ensuring there are no excess wire loops inside the electrical enclosure. Correct phase connection is required.
59

Electrical Data Table
Model
Electrical Connection Max Current per Phase
(running, excl pump) Max Pump Current Minimum Circuit Size (per phase)

Ducted 952015

Non-Ducted

Ducted

Non-Ducted

953015

952030

953030

3 Phase / 415 Volts / 50 Hz

14.4A

12.5A

23.2A

23.0A

2.4

2.4

20A

4.4

4.4

40A

Primary Pump
The power to the primary pump for each heat pump is supplied from the water heater. Connect the active, neutral and earth wire to the pump terminals as shown in the diagram inside the pump cover and to the terminals located within the heat pump electrical enclosure.

Wiring for CM3-2

Wiring for CM10-1

Inside the pump cover
A 20 mm conduit is required for the electrical cable between the water heater and pump. The conduit is to be connected to the water heater with a 20 mm terminator. Holes are provided on the electrical panel for cabling.
Photo inside the heat pump enclosure
60

Tank Sensor Installation
Connect one of the supplied temperature sensors to the connection terminal on the heat pump marked “Tank Sensor”. · Run out the sensor to the nearest storage tank. · For 610 and RW series tanks, a thermostat
well is supplied within each tank. · Remove the plastic cover from the fitting
located 90o from the water connections on the storage tank, but do not discard. · Make a small hole in the centre of the plastic cap and thread the sensor through the hole. · For RT series tanks, a thermostat well is supplied which needs to be fitted to the lowest fitting as shown. · Insert the sensor all the way into the thermostat well and fit the plastic cap back onto the storage tank. · To prevent the sensor dislodging from the well, screw the cable to the tank jacket using a cable clamp. · Cable tie the sensor lead, curling up and tying off any excess lead.
Fit sensor well here
Building Flow Temperature Sensor Installation
· Connect the 2nd temperature sensor to the connection terminal on the heat pump marked “Building Flow Sensor”.
· Run out the sensor to the building flow pipe. · Fit a thermostat well (not supplied) in the pipe ensuring the end of the
sensor is in the flow of water. To prevent the sensor dislodging from the well, secure the sensor to the insulation using a cable tie. Alternatively, clamp the sensor to the outside of the pipe using a pipe clamp prior to the insulation being fitted.
Note: where multiple 15kW model heat pumps are installed, the preferred method is to interconnect the heat pumps (up to 6 maximum) via LAN cables, available as an accessory (part number: 17670).
In this case, only one tank sensor and building flow temperature sensor is required, which are connected to the heat pump designated as the Master.
61

Alternatively, each 15kW or 30kW heat pump can operate independently in which case each tank sensor and building flow temperature sensor must be connected and fitted as described above. Note: failure to fit a sensor when independantly operated will result in a sensor error alarm. Note: It is not possible to LAN connect 30kW model heat pumps in a Master/Slave arrangement. Where the number of 30kW heat pumps exceeds the number of storage tanks multiple sensors will need to be fitted to each tank. A larger thermal well will be required to allow up to two sensors to fit within one tank. (Accessory part number 079445).
62

Low Ambient Boost
If auxiliary boosting is required for low ambient operation, the booster should be interlocked with the heat pump to only operate under low ambient or fault conditions.
Auxiliary Boost Element
Depending on the installation, an auxiliary boost element may be supplied with an RT or RW series storage tank. If an auxiliary boost element is supplied by Rheem, remove bridging wire at the terminals marked A7 and A9′ behind the element controller cover and connect the terminalA7′ and A9′ of the element to the voltage free terminal markedVF / VF’ in the heat pump enclosure to control the operation of the boost element. Wiring is not polarity sensitive. Refer to the diagram on page 63 and photo on page 64
Electric Heating Unit ­ Wiring Diagram
63

CONNECTIONS

CONNECTIONS – ELECTRICAL
Picture of heat pump terminal strip Auxiliary Element Control by Individual Heat Pumps ­ All models Where multiple auxiliary boost elements are required, and the number of auxiliary boost elements matches the number of heat pumps, each element may be interlocked with an individual heat pump directly using the method described above. In this case, the heat pumps should operate independently, and each have their own tank and building flow temperature sensor connected. Auxiliary Element Control by Master Heat Pump ­ 15kW models Where the number of auxiliary boost elements does not match the number of heat pumps or the heat pumps are connected in a Master/Slave arrangement using LAN cables (refer to page 66), then the heat pumps must be connected via LAN cables and control of the auxiliary boost elements will be via the Master heat pump using an intermediary relay arrangement. Refer to Application Guide for more detail. Auxiliary Element Control – 30kW models Where the number of 30kW model heat pumps does not match the number of auxiliary boost elements (greater than or less than) then connect each heating element to an individual heat pump where possible using the method described above. For the balance, where multiple heat pumps need to control a single element or multiple elements need to be controlled by a single heat pump, then control of the auxiliary booster elements will be via an intermediary relay box (not supplied) and powered by the heat pump “SA”, “N” and “GND” terminals. ”
64

CONNECTIONS – ELECTRICAL
Auxiliary Boost Heater (external to storage tank)
Depending on the installation, an auxiliary heater and/or boost pump may be supplied. Refer to Application Guide for auxiliary boost options. In the heat pump enclosure, terminals marked “SA”, “N” and “GND” provide 240V to control the auxiliary heater and/or auxiliary pump or multiple boost elements or allow one boost heater to be controlled by multiple heat pumps depending on the system design. Maximum current is 1A. Refer to Application Guide for further information to connect auxiliary boost heater. For 15kW models connect in a Master/Slave arrangement using LAN cables (up to six heat pumps) (refer to page 66), and control of the auxiliary boost heaters will be via the Master heat pump. Refer to Application Guide for more details.
65

CONNECTIONS – ELECTRICAL
Multiple Heat Pump Installation using LAN Cables ­ 15kW
Up to six 15kW heat pumps can be interconnected by daisy chaining the LAN cables for operation as shown below. LAN cable is available as an accessory (part number: 17670). Step 1:

1st Heat Pump

1

2

3

Master

4

5

Slave Heat Pumps
Interconnect the heat pumps as shown above by using the LAN cables. Determine the 1st heat pump as Master. Route the cables neatly to prevent damage and trip hazards. Do not route across access panels.
Note: Any of the two LAN connections will be acceptable.
Step 2:
In 2nd heat pump enclosure: Connect “DI3” with “DIC1”. Connect “DIC1” with the existing wire as shown in the picture.
Note: Terminal plug can be removed for ease of making connections by pulling downwards as shown in the picture.

66

CONNECTIONS – ELECTRICAL
In 3rd heat pump enclosure: Connect “DI4” with “DIC1”. Connect “DIC1” with the existing wire as shown in the picture.

In 4th heat pump enclosure:
Connect “DI3” with “DI4” and “DIC1”. Connect “DIC1” with the existing wire as shown in the
picture.

Note 1.
2.
3.

Tank temperature sensor for the Master heat pump must be connected, otherwise the heat pumps will not operate due to fault. There is no need to connect tank temperature sensors for Slave heat pumps. Building temperature sensor for the Master heat pump must be connected. There is no need to connect building temperature sensors for Slave heat pumps. Ignore the values for tank and building temperature sensors on the display of Slave heat pumps as these are not connected.

Building Management Systems (BMS/BAS)
Each water heater can be connected to a BMS or BAS system via interface cards (Modbus RS485 or BACnet MS-TP or BACnet TCP/IP Ethernet), available as an accessory.

67

CONNECTIONS – ELECTRICAL
Modbus RS485 is provisioned on the controller and can be used for BMS connection without any additional interface cards when each heat pump is directly connected to the BMS. Interface cards, supplied by Rheem, are required for BACnet MS-TP or BACnet TCP/IP Ethernet, or if multiple 15kW model heat pumps are connected to BMS in aster Slave arrangement using Modbus RS485. If an interface card is required, connect to Rheem IQ control panel as shown in the diagram below.
· If the system is comprised of single or multiple standalone heat pumps, each heat pump will have its own BMS card and/or connection.
If required, insert the BMS card into the connector for each heat pump, taking care that the card is firmly placed as shown in red circle. · If the system is comprised of multiple heat pumps for Master/Slave operation,
only master heat pump will have a BMS card and the slave heat pumps will be connected via LAN cables. Follow the instruction on page 66 for Interconnecting Multiple Heat Pumps from step 1 to step 2. Insert the BMS card into the connector for master heat pump, taking care that the card is firmly placed as shown in red circle.
68

CONNECTIONS – ELECTRICAL
15KW HEAT PUMP WIRING DIAGRAM ­ 952015 AND 953015 MODELS
69

CONNECTIONS – ELECTRICAL
30KW HEAT PUMP WIRING DIAGRAM- 952030 AND 953030 MODELS
70

CONNECTIONS – ELECTRICAL
Controller and Display Information
71

CONNECTIONS – ELECTRICAL
Note: If no keys are pressed for 60 seconds, screen reverts to main display screen and any changes made and not confirmed will be lost. Set Point Quick Setting Press prg’ from the main display screen and the Set Point page will appear. Cursor will be on the set temperature. Pressing the up and down keys will adjust the setting in 0.1 increments. Hold down for rapid change. Press ‘Enter’ to confirm change. Pressesc’ to return to the main display screen. The factory setting is 61C. The set point can be adjusted up to 65C depending on site suitability after consulting with Rheem.
Menu Item
A. On/Off ­ Press ‘enter’ to access change. Press up’ ordown’ to turn unit on or off. Press enter’ to confirm. Pressdown’ key to display type of circulating pump control. Default: AUTOMATIC ON TEMP Press esc’ to return to Menu Master. B. Set Point – displays the tank maximum set point at which the compressor will be deactivated. Cursor will be on the set temperature. Pressing theup’ and down’ keys will adjust the setting in 0.1 increments. Hold down for rapid change. Press ‘enter’ to confirm change. Pressesc’ to return to the Menu Master.
C. Clock / Scheduler ­ time and date are set here. Other adjustments include:
i. Enable Scheduler: No (controls heat pump operating time based on programmed time period)
ii. Enable Tariff: No (controls heat pump operating time based on tariffs)
iii. Enable D.L. Save: No (shifts time based on seasons)
72

CONNECTIONS – ELECTRICAL

i.

Enabling Scheduler to `Yes’ will open a 2nd page which will allow

the user to program specified operating times on a 7-day basis.

E.g.:

Clock Schedule
Mon 00:00 to 00:00
Tue 00:00 to 00:00 Pressing the down’ key will reveal a 2nd page in the Clock Scheduler: ­ Do you want to enable Special Event: No (programs the temperature to be maintained during a specified date range) Enabling the Special Event toYes’ allows user to program in the desired date range, set point and differential to be
maintained during the Special Event period.

ii.

Enabling Tariff to Yes will open the Tariff Time Band pages which

allows the user to program which hours are off peak, shoulder and

peak in 12 hour blocks as Weekday AM, Weekday PM, Weekend

AM, Weekend PM.

A third page allows the user to load the default for NSW or QLD or Custom. Press `esc’ until page returns to the Menu Master.

73

CONNECTIONS – ELECTRICAL

D. Input/output View ­ Displays the actual readings as follows:

Hot Enter Temp:
Hot Leave Temp:
Cold enter Temp: Cold Leave Temp:
Compressor 1 ­ Low Press: sat. suction: Suction: High Press:
sat. condenser: out. coil Temp: LP1 switch: OK HP1 switch: OK Flow switch: On/Off
Comp O/Load: On/Off Remote: On/Off
Compressor 1: On/Off Rev. valve: On/Off Fan: On/Off Circ. Pump: On/Off
Outside Temp:
Tank Temp: Building Flow
Temp: Digital Inputs: Relay Outputs:

Potable water temperature entering and leaving the condenser heat exchanger (A2W and W2W heat pumps)
Non-potable/chilled water temperature entering and leaving the evaporator heat exchanger (W2W heat pump)
Compressor temperature and pressure readings
Evaporator coil temperature (A2W heat pump) Hi and Lo pressure switches closed or open circuit Flow switch in non-potable/chilled water circuit activated (W2W heat pump) Compressor overload activated Remote control of heat pump activated Compressor status Reversing valve status (NA) Fan status (A2W heat pump) Primary pump/s status (NB: both nonpotable/chilled and potable water pumps are activated by same relay in W2W heat pump) Ambient air sensor temperature (A2W heat pump) Temperature at near bottom of tank Temperature being delivered to building flow
Displays the number of inputs and outputs

74

CONNECTIONS – ELECTRICAL
E. Alarm History ­ will display up to 150 alarm events and then will overwrite oldest event. Alarms can be cleared by pressing the `Alarm Bell’ key.
F. Service ­ password: 0022 a. Change display (do not use) b. Information ­ software version information c. Summer/Winter (not applicable to this product) d. Working Hours: i. Circ. Pump / reset counter ii. Compressor 1 / reset counter iii. Outdoor Fan 1 / reset counter e. BMS configuration (will time out after 5 minutes if no buttons pressed) Address: 1 (if BMS Interface Card Modbus on RS485 is used, change the address value based on the unique address set by the customer’s network. For all other BMS interface cards, ignore this value) Protocol: CAREL/Modbus (choose Modbus only for BMS Interface Card Modbus on RS485. For all other BMS interface cards, choose CAREL) Speed: 19200 (if BMS Interface Card Modbus on RS485 is used, change the speed value based on the customer’s network. For all other BMS interface cards, use 19200 as speed)
75

CONNECTIONS – ELECTRICAL

f. Service Settings a. Working Hour Set b. Prove Adjustment c. Thermoregulation (for multiple heat pump installation, change the no. of compressor and other settings from here.)

c. Thermoregulation

Parameter Thermoregulation 01 Thermoregulation 02 (De-ice temperature) Thermoregulation 03 (De-ice timers)
Thermoregulation 04 (Pump settings)
Thermoregulation 04s
Thermoregulation 05
I/O Config 05
Thermoregulation 06 (Enable unit On/Off)
I/O Config 06b
Thermoregulation 07 (HP/LP Safety) Thermoregulation 08 (Anti-freeze safety for PHE evaporator (leave))
Thermoregulation 09
Thermoregulation 10 (Low outside air temp i.e low ambient aux boost)

Sub Parameter Setpoint Differential Dead band Initiate Terminate Delay to start Max duration Min between Coil de-water Flow proof delay Pump min run Pump run on time Temp. test cycle Flow switch fitted Flow switch fitted Blackout delay No of compressors (number of heat pumps) Compressor staging Controlling sensor Out air sensor Sensor type By digital input By supervisor By flow switch Dig input 6 is for: Storage tank temp Sensor type Building flow temp Sensor type LP trip set HP trip set
Low limit set
Aux. Boost Fitted % compressor in alarm to activate boost Boost act. Delay Cut over point Differential Comp stop in low outside air temp:

Master 60.0°C 3.0°C 0.5°C
-4°C 10.0°C
5m 10m 30m 30s 3s 5m 1m Not avail No Screen N/A 10s Set as required (default

1. Simultaneous Tank Yes Carel NTC No No Not avail Comp O/Load Yes Carel NTC Yes Carel NTC 0.4 Bar 27.5 Bar
   0.0ºC
   Yes
   50%
   5m 5.0ºC 2.0ºC
   No

Slave Screen N/A Screen N/A Screen N/A
-4°C 10.0°C
5m 10m 30m 30s Screen N/A Screen N/A Screen N/A Screen N/A Screen N/A No Screen N/A
Screen N/A
Screen N/A Screen N/A
No Carel NTC Screen N/A Screen N/A Screen N/A Screen N/A
No Carel NTC
No Carel NTC
0.4 Bar 27.5 Bar
Screen N/A
Screen N/A
Screen N/A
Screen N/A Screen N/A Screen N/A
Screen N/A

d. User DEV/Change PW1

For more information, please refer to the service manual for heat pumps.

76

COMMISSIONING

To Fill And Turn On The Water Heater
The power supply to the water heater and controller must not be switched on until the water heater is filled with water and a satisfactory megger reading is obtained.
Warning: This water heater contains electronic equipment and 500 V insulation tests must only be conducted between actives and earth and between neutral and earth. An active to neutral test WILL damage the electronics.
Commissioning Procedure ­ Standalone Heat Pump Configuration
· Perform this procedure to commission a single (standalone) heat pump. · If the system is comprised of multiple standalone heat pumps, perform
this procedure for each heat pump.
· Open all of the hot water taps in the building (don’t forget the showers) and supply cocks and valves in the system.
· Open the isolation valves fully on the cold, return and hot water branches to the storage tanks.
· Open the main cold water isolation valve. · Air will be forced out of the taps. · Close each tap as water flows freely from it. · Check the pipe work for leaks. · Switch on the electrical supply at the isolating switch to the water heater. · Set time/tariff control if required. · Reset alarms. Skip this step if there are no alarms.
If the water heater is full of cold water, the fan and pump will activate and heating will commence unless the ambient air temperature is below 0oC, in which case the auxiliary boost will operate, if installed.
It is important to wait for five minutes after the heat pump has activated to ensure it continues to operate and is functioning correctly.
Note: The water heater may not turn on immediately when it is first switched on, if it is switched on within 20 minutes to 2 hours of it having been switched off at
77

the isolating switch, or the heat pump has just completed a heating cycle. The water heater will wait until the conditions for start-up are favourable in order to protect the compressor from damage. This may take up to 20 minutes to 2 hours. The auxiliary booster (if installed) will operate instead of the heat pump if the ambient air temperature is less than the ambient sensor set point.
Explain to a responsible officer the functions and operation of the heat pump water heater. Upon completion of the installation and commissioning of the water heating system, leave this guide with the responsible officer.
Commissioning Procedure ­ Master/Slave Configuration
Perform this procedure if the system is comprised of multiple heat pumps to be configured for Master/Slave operation.
· Open all of the hot water taps in the building (don’t forget the showers) and supply cocks and valves in the system.
· Open the isolation valves fully on the cold, return and hot water branches to the storage tanks.
· Open the main cold water isolation valve on the cold water line to the storage tanks. Air will be forced out of the taps.
· Close each tap as water flows freely from it. · Check the pipe work for leaks.
Before commencing the Master/Slave commissioning procedure, ensure the
`Multiple Heat Pump Installation using LAN Cables ­ 15kW
– step 1 and step 2 have been completed as stated on page 66.
The commissioning procedure MUST be performed in the order shown.

1st Heat Pump

1

2

3

Master

4

5

Slave Heat Pumps

78

1. Ensure all heat pumps are turned OFF at the isolating switch.

2. Turn ON slave 1 heat pump (2nd heat pump).

3. Configure heat pump address. · Whilst in the home screen on control panel, simultaneously press and hold Up , Down and Enter for 5 seconds to enter the setup menu. · Use Up or Down buttons to set values. · Press and release Enter to move curser to next line. · Change the following values as shown below.

Menu
Display address setting

Slave 1 17

Slave 2 18

Slave 3 19

Master 16

Example Screen Image of Slave 1

I/O board

02

03

04

01

address

trm1

32

32

32

32

trm2

17

18

19

16

trm3 None

Yes

Yes

Yes

Yes

­ Ok?

· Press “Enter” to confirm settings. The screen will change to the home screen and settings will be saved.

Note that the slave’s pump will start and an alarm may occur ­ ignore at this stage.

4. Change slave heat pump ‘Out air sensor’, ‘Storage tank temp’ sensor and ‘Building flow temp’ sensor parameters to ‘No’.

· Go to the Service menu (Service>Service Settings- password 0022>Thermoregulation). Refer to page 71 to see the chart for navigating Service menu and page 76 for Thermoregulation section or see the table below.

Parameter Thermoregulation 05 I/O Config 05

Sub Parameter Blackout delay
No of compressors
Compressor staging Controlling sensor Out air sensor

Master 10s
Set as required (default 1)
Simultaneous Tank Yes

Slave Screen N/A
Screen N/A
Screen N/A Screen N/A
No

79

Thermoregulation 06 (Enable unit On/Off)
I/O Config 06b

Sensor type By digital input By supervisor By flow switch Dig input 6 is for: Storage tank temp Sensor type Building flow temp

Carel NTC No No
Not avail Comp O/Load
Yes Carel NTC
Yes

Carel NTC Screen N/A Screen N/A Screen N/A Screen N/A
No Carel NTC
No

5. Turn OFF the Slave heat pump. · If there is only 1 slave proceed directly to step 6. · If there are 2 or 3 Slave heat pumps repeat step 3 to step 5 for Slave 2 and Slave 3 respectively using the values for respective Slave heat pumps.

6. Turn ON Master heat pump and set the master address as stated in step 3.

7. After commissioning the Master heat pump, go to the Service menu (Service>Service Settingspassword 0022>Thermoregulation>no. of compressor) on the Master heat pump and change the number of compressors according to the number of heat pumps interconnected together.

Refer to page 71 to see the chart for navigating Service menu and page 76 for Thermoregulation section or see the table below.

Parameter Thermoregulation 05

Sub Parameter Blackout delay No of compressors (Number of heat pumps) Compressor staging Controlling sensor

Master 10s
Set as required (default 1)
Simultaneous Tank

8. Turn on all the heat pumps. 9. Reset alarms on each heat pump. Skip this step if there are no alarms. 10. Set time/tariff control on Master heat pump if required. Refer to page 71 to
see the chart for navigating the control panel display. If the water heaters are full of cold water, the fan will activate on each water heater and heating will commence unless the ambient air temperature is below the ambient sensor set point, in which case the auxiliary boost will operate, if installed.

It is important to wait for five minutes after each heat pump has activated to ensure it continues to operate and is functioning correctly.

80

Note: The heat pump may not turn on immediately when it is first switched on, if it is switched on within 20 minutes to 2 hours of it having been switched off at the isolating switch, or the heat pump has just completed a heating cycle. The heat pump will wait until the conditions for start-up are favourable in order to protect the compressor from damage. This may take up to 20 minutes to 2 hours. The auxiliary booster (if installed) will operate instead of the heat pump if the ambient air temperature is less than the ambient sensor set point. Explain to a responsible officer the functions and operation of the heat pumps. Upon completion of the installation and commissioning of the water heating system, leave this guide with the responsible officer.
81

Commissioning Procedure- BMS Configuration
Before commencing the commissioning procedure, ensure the Building Management Systems (BMS/BAS)’ installation procedure has been completed as stated on page 67. · If the system is comprised of single or multiple standalone heat pumps, perform this procedure for each heat pump. Each heat pump will have its own BMS card. · If the system is comprised of multiple heat pumps for Master/Slave operation, perform this procedure for only master heat pump. Only master heat pump will have a BMS card and the slave heat pumps will be connected via LAN cable. Configure BMS settings from the display of the heat pump. After commissioning the Master heat pump, go to the Service menu (Service- password 0022>BMS config). Refer to page 71 to see the chart for navigating Service menu. Configuration: BMS Interface Card Modbus on RS485 1\. Go to BMS configuration (will time out after 5 minutes if no buttons pressed) Change the settings for BMS configuration from the display menu as mentioned below. Address: Change the address value based on the unique address set by the customer’s network. Protocol: Choose optionModbus’ Speed: Change the speed value based on the customer’s network. 2. Parameter table is provide for customers to follow for further configuration to customer’s network on page 85.
Configuration: BMS Interface card BACnet MS-TP
1. Go to BMS configuration (will time out after 5 minutes if no buttons pressed)
Change the settings for BMS configuration from the display menu as mentioned below.
Address: No change required (address is irrelevant for this card).
82

Protocol: CAREL
Speed: 19200 (this value is set from factory to communicate between heat pump and BMS card)
2. Open the heat pump enclosure and check the BMS card.
The BACnet MS-TP card features a button (PUSHBUTTON) and two indicator lights (STATUS LED and NETWORK LED).
Functions of the button: When starting up the BACnet MS-TP, this is used to select, for network communication, whether to use the factory parameters or the user parameters
In normal operation, reboots BACnet MS-TP without needing to disconnect the power supply
Status LED: indicates the status of communication with the heat pump and the card. Once the starting sequence has been completed, the Status LED flashes to indicate the quality of communication.
a. If Status LED flashes green, then communication with the BACnet MS-TP is OK.
b. If LED is red or green-red-green, then the communication is not established. In that case, check the BMS configuration.
Network LED: The Network LED (right) indicates the status of communication with customer’s network. Once the starting sequence has been completed, the Network LED flashes to indicate the quality of communication with customer’s network.
a. If Network LED flashes green with occasional red flashes then communication is OK.
b. If Network LED flashes green and red ON together (BACnet MS/TP meaning: continuous Poll-For-Master): communication not established (connection problems, or no network device found); this may depend on electrical connection difficulties or communication settings that are not compatible with the other network devices connected.
3. For further configuration of BACnet MS-TP card, please follow the “BACnet MSTP Configuration Guide”.
4. Parameter table is provided for customers to follow for further configuration to customer’s network on page 85.
83

Configuration: BMS Interface card BACnet TCP/IP Ethernet
1. Go to BMS configuration (will time out after 5 minutes if no buttons pressed)
Change the settings for BMS configuration from the display menu as mentioned below.
Address: No change required (address is irrelevant for this card). Protocol: CAREL
Speed: 19200 (this value is set from factory to communicate between heat pump and BMS card) 2. Open the heat pump enclosure and check the BMS card.
The BACnet TCP/IP Ethernet card features a button (PUSHBUTTON) and two indicator lights (STATUS LED and NETWORK LED).
Functions of the button: When starting up the TCP/IP Ethernet card, this is used to select, for network communication, whether to use the factory parameters or the user parameters. In normal operation, reboots TCP/IP Ethernet card without needing to disconnect the power supply. Status LED: indicates the status of communication with the heat pump and the card. Once the starting sequence has been completed, the Status LED flashes to indicate the quality of communication.
a. If Status LED flashes green or green steady, then communication with the BACnet TCP/IP Ethernet card is OK.
b. If LED is red or green-red-green, then the communication is not established. In that case, check the BMS configuration.
Network LED: Displays the status of the physical network connection (Ethernet connection signals), regardless of whether the network parameters are correct; usually this must be green and flash when data is transmitted/received.
3. For further configuration of BACnet TCP/IP Ethernet card, please follow the “BACnet TCP/IP Ethernet Configuration Guide”.
4. Parameter table is provided for customers to follow for further configuration to customer’s network on page 85.
84

Refer to the parameter tables below for BMS:

Analog variables

BMS Address

Description

1 reading from input 1 Hot Entering water Sensor

2 reading from input 2 Hot Leaving water Sensor

3 reading from input 3 Out. coil sensor

4 reading from input 4 Suction Temperature sensor

5 reading from input 5 Out Air sensor

6 reading from input 6 LP Pressure sensor fitted

7 reading from input 7 HP Pressure sensor fitted

8 reading from input 8 Cold Enter water

9 reading from input 9 Cold Leave water

10 reading from input 10 Hot Entering water Sensor

11 reading from input 11 Hot Leaving water Sensor

12 reading from input 12 Out. coil sensor

13 Virtual Analoge Output 1

14 Virtual Analoge Output 2

15 Virtual Analoge Output 3

16 Virtual Analoge Output 4

17 Virtual Analoge Output 5

18 Virtual Analoge Output 6

19 Superheat valve Comp 1

20 Superheat valve Comp 2

21 Superheat valve Comp 3

22 Superheat valve Comp 4

Default 0
0
0
0
0
0
0
0
0
0
0
0
0 0 0 0 0 0 0 0 0 0

Category UOM Default —
Default —
Default —
Default —
Default —
Default —
Default —
Default —
Default —
Default —
Default —
Default —
Default –Default –Default –Default –Default –Default –Default –Default –Default –Default —

Min -3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
-3276.8
0 0 0 0 0 0 -72.0 -72.0 -72.0 -72.0

Max 3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7
3276.7 3276.7 3276.7 3276.7 3276.7 3276.7 324.0 324.0 324.0 324.0

Read/Write R
R
R
R
R
R
R
R
R
R
R
R
R R R R R R R R R R

85

Variable name Probe_Value_1
Probe_Value_2
Probe_Value_3
Probe_Value_4
Probe_Value_5
Probe_Value_6
Probe_Value_7
Probe_Value_8
Probe_Value_9
Probe_Value_10
Probe_Value_11
Probe_Value_12
VAOut_1 VAOut_2 VAOut_3 VAOut_4 VAOut_5 VAOut_6 Superheat_C1 Superheat_C2 Superheat_C3 Superheat_C4

23 Control Temperature

24 Outside Air Temperature

25 Entering water temperature

26 Leaving water temperature

27

Condenser temperature (either from NTC or P-T)

28 Current entering water Setpoint

29

Active Proportional Band for compressor

BMS Address

Description

30 Water Setpoint

31 Dead band

32 Proportional Band for compressor

33 Entering water temperature 2

34 Leaving water temperature 2

35 Storage tank water temperature

36

Building Supply water temperature (Flow)

0

Default °C

-99.9

0

Default BAR

-99.9

0

Default °C

-99.9

0

Default °C

-99.9

0

Default —

-99.9

22.0

Default °C

0

1.5

Default °C

0

Default
22.0 1.0 1.5 0 0 0
0

Category UOM
Default °C Default °C Default °C Default °C Default °C Default °C
Default °C

Min
5.0 0 0 -99.9 -99.9 -99.9
-99.9

99.9

R

99.9

R

99.9

R

99.9

R

99.9

R

45.0

R

9.9

R

Max

Read/Write

45.0

R/W

9.9

R/W

25.0

R/W

99.9

R

99.9

R

99.9

R

99.9

R

Ctrl_temp OAT
EW_temp LW_temp Cond_temp
Active_Setpoint Active_Pro_band
Variable name
Setpoint D_Band Pro_band EW_temp2 LW_temp2 Tank_temp Bld_Supply_temp

Integer variables

BMS Address

Description

21

type of tariff – timeband 0 week end

22

type of tariff – timeband 1 week end

23

type of tariff – timeband 2 week end

24

type of tariff – timeband 3 week end

25

type of tariff – timeband 4 week end

26

type of tariff – timeband 5 week end

27

type of tariff – timeband 6 week end

28

type of tariff – timeband 7 week end

29

type of tariff – timeband 8 week end

30

type of tariff – timeband 9

31

type of tariff – timeband 10 week end

32

type of tariff – timeband 11 week

Default
0
0 0 0 0 0 0 0 0 0 0 0

Category UOM Min

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Max
2
2 2 2 2 2 2 2 2 2 2 2

Direction
R/W
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W

86

Variable name
trfw_0
trfw_1 trfw_2 trfw_3 trfw_4 trfw_5 trfw_6 trfw_7 trfw_8 trfw_9 trfw_10 trfw_11

end

33

type of tariff – timeband 12 week end

34

type of tariff – timeband 13 week

end

35

type of tariff – timeband 14 week end

36

type of tariff – timeband 15 week

end

37

type of tariff – timeband 16 week end

38

type of tariff – timeband 17 week

end

BMS Address

Description

39

type of tariff – timeband 18 week end

40

type of tariff – timeband 19 week

end

41

type of tariff – timeband 20 week end

42

type of tariff – timeband 21 week

end

43

type of tariff – timeband 22 week

end

44

type of tariff – timeband 23 week end

49

State of unit.

Meaning of Status:

0 – waiting (at power up)

1 – Unit On

2 – Unit OFF by Alarm

3 – Unit OFF by Flow Switch

4 – Unit OFF by BMS

5 – Unit OFF by Scheduler (timeclock)

6 – Unit OFF by Digital Input

7 – Unit OFF by Keyboard (Service mode)

8, 9, 10, 11, 12, 13 not used

70

Compressor 1 Hour run counter (low)

71

Compressor 1 Hour run counter (high)

72

Compressor 2 Hour run counter (low)

73

Compressor 2 Hour run counter (high)

74

Compressor 3 Hour run counter (low)

75

Compressor 3 Hour run counter (high)

76

Compressor 4 Hour run counter (low)

77

Compressor 4 Hour run counter (high)

0 0 0 0 0 0
Default 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Category UOM Min

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

2 2
2 2
2
2
Max 2 2
2 2
2
2 13

R/W R/W
R/W R/W
R/W
R/W
Direction R/W R/W
R/W R/W
R/W
R/W R

999

R

999

R

999

R

999

R

999

R

999

R

999

R

999

R

87

trfw_12 trfw_13 trfw_14 trfw_15 trfw_16 trfw_17
Variable name trfw_18 trfw_19 trfw_20 trfw_21 trfw_22 trfw_23
Unit_Status
Comp_T_Hours_L_1 Comp_T_Hours_H_1 Comp_T_Hours_L_2 Comp_T_Hours_H_2 Comp_T_Hours_L_3 Comp_T_Hours_H_3 Comp_T_Hours_L_4 Comp_T_Hours_H_4

78

Pump Hour run counter (low)

79

Pump Hour run counter (high)

86

Outdoor Fan 1 Hour run counter (low)

87

Outdoor fan 1 Hour run counter (high)

88

Outdoor Fan 2 Hour run counter (low)

89

Outdoor fan 2 Hour run counter (high)

90

Outdoor Fan 3 Hour run counter (low)

91

Outdoor fan 3 Hour run counter (high)

92

Outdoor Fan 4 Hour run counter (low)

93

Outdoor fan 4 Hour run counter (high)

100

101

BMS Address

Description

102

103

Current year

104

Current month

105

Current day

106

Current hour

107

Current minute

0 0 0 0 0 0 0 0 0 0 15018 15018
Default
0 0
1
1
0
0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Default —

0

Category UOM Min

Default —

0

Clock / —

0

TimeDate

Clock / —

1

TimeDate

Clock / —

1

TimeDate

Clock / h

0

TimeDate

Clock / —

0

TimeDate

Digital variables

BMS Address

Description

1

Digital Input 1

2

Digital Input 2

3

Digital Input 3

4

Digital Input 4

5

Digital Input 5

6

Digital Input 6

7

Digital Input 7

8

Digital Input 8

9

Digital Input 9

10

Digital Input 10

Default

Category UOM

Min

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

999 999 999 999 999 999 999 999 999 999 32767 32767
Max
9999 99
12
31
23
59

R R R R R R R R R R R R
Direction
R R
R
R
R
R

Max

Direction

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

Pump_T_Hours_L Pump_T_Hours_H OutFan_T_Hours_L_1 OutFan_T_Hours_H_1 OutFan_T_Hours_L_2 OutFan_T_Hours_H_2 OutFan_T_Hours_L_3 OutFan_T_Hours_H_3 OutFan_T_Hours_L_4 OutFan_T_Hours_H_4
BMS_Sw_Ver BMS_Sw_Date Variable name
Manuf_Password CURRENT_YEAR
CURRENT_MONTH
CURRENT_DAY
CURRENT_HOUR
CURRENT_MINUTE
Variable name
Din_1 Din_2 Din_3 Din_4 Din_5 Din_6 Din_7 Din_8 Din_9 Din_10

88

11

Digital Input 11

12

Digital Input 12

13

Digital Input 13

14

Digital Input 14

15

Digital Input 15

16

Digital Input 16

17

Digital Input 17

18

Digital Input 18

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

0

Default —

0

BMS Address

Description

Default

Category UOM

Min

19

Virtual Digital Output 1

0

Default —

0

20

Virtual Digital Output 2

0

Default —

0

21

Virtual Digital Output 3

0

Default —

0

22

Virtual Digital Output 4

0

Default —

0

23

Virtual Digital Output 5

0

Default —

0

24

Virtual Digital Output 6

0

Default —

0

25

Virtual Digital Output 7

0

Default —

0

26

Virtual Digital Output 8

0

Default —

0

27

Virtual Digital Output 9

0

Default —

0

28

Virtual Digital Output 10

0

Default —

0

29

Virtual Digital Output 11

0

Default —

0

30

Virtual Digital Output 12

0

Default —

0

31

Virtual Digital Output 13

0

Default —

0

32

Select if din 6 is Compressor Overload

0

or DRED

Default —

0

35

remote / maintenance enable of

compressor 1

1

Default —

0

36

remote / maintenance enable of

compressor 2

1

Default —

0

37

remote / maintenance enable of

compressor 3

1

Default —

0

38

remote / maintenance enable of

compressor 4

1

Default —

0

41

Actual status of compressor 1

0

Default —

0

42

Actual status of compressor 2

0

Default —

0

43

Actual status of compressor 3

0

Default —

0

44

Actual status of compressor 4

0

Default —

0

89

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

Max

Direction

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R

1

R/W

1

R/W

1

R/W

1

R/W

1

R/W

1

R

1

R

1

R

1

R

Din_11 Din_12 Din_13 Din_14 Din_15 Din_16 Din_17 Din_18
Variable name
VDOut_1 VDOut_2 VDOut_3 VDOut_4 VDOut_5 VDOut_6 VDOut_7 VDOut_8 VDOut_9 VDOut_10 VDOut_11 VDOut_12 VDOut_13 Sel_dred_ol
Comp1_En
Comp2_En
Comp3_En
Comp4_En
Device_Status_Comp_1 Device_Status_Comp_2 Device_Status_Comp_3 Device_Status_Comp_4

45

Actual status of reverse valve

0

Default —

0

46

Actual status of reverse valve 2

0

Default —

0

47

Actual status of reverse valve 3

0

Default —

0

48

Actual status of reverse valve

0

Default —

0

49

On-Off unit state (0: Off; 1: On)

0

Default —

0

Supervisor (BMS) On-Off. Show the

50

state OFFbyBMS in main mask (0: Off;

0

1: On)

Default —

0

51

Alarm reset from supervisory

1

Default —

0

BMS Address

Description

Default

Category UOM

Min

52

Enable tariff time zone management

0

Default —

0

120

Alarm relay

0

Default —

0

121

Alarm from probe on input 1

0

Alarms —

0

122

Alarm from probe on input 2

0

Alarms —

0

123

Alarm from probe on input 3

0

Alarms —

0

124

Alarm from probe on input 4

0

Alarms —

0

125

Alarm from probe on input 5

0

Alarms —

0

126

Alarm from probe on input 6

0

Alarms —

0

127

Alarm from probe on input 7

0

Alarms —

0

128

Alarm from probe on input 8

0

Alarms —

0

129

Alarm from probe on input 9

0

Alarms —

0

130

Alarm from probe on input 10

0

Alarms —

0

131

Alarm from probe on input 11

0

Alarms —

0

132

Alarm from probe on input 12

0

Alarms —

0

133

Alarm_comp1

0

Default —

0

134

Alarm_comp2

0

Default —

0

135

Alarm_comp3

0

Default —

0

136

Alarm_comp4

0

Default —

0

137

Compressor Overload 1

0

Default —

0

138

Compressor Overload 2

0

Default —

0

139

Compressor Overload 3

0

Default —

0

140

Compressor Overload 4

0

Default —

0

1

R

1

R

1

R

1

R

1

R

1

R/W

1

R/W

Max

Direction

1

R/W

1

R

1

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Device_Status_rev_vlv1 Device_Status_rev_vlv2 Device_Status_rev_vlv3 Device_Status_rev_vlv4
Sys_On
Superv_OnOff
RST_Alarms Variable name
Trf_en Alarm Al_probe_1 Al_probe_2 Al_probe_3 Al_probe_4 Al_probe_5 Al_probe_6 Al_probe_7 Al_probe_8 Al_probe_9 Al_probe_10 Al_probe_11 Al_probe_12 Device_Alarm_comp1 Device_Alarm_comp2 Device_Alarm_comp3 Device_Alarm_comp4 Comp_OL1 Comp_OL2 Comp_OL3 Comp_OL4

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To Turn Off The Water Heater
If it is necessary to turn off the water heater on completion of the installation, such as on a building site or where the premises are vacant, then: · Switch off the electrical supply at the isolating switch to the water heater. · Close the cold water isolation valve at the inlet to the system.
DRAINING THE WATER HEATER
To drain the water heater: · Turn off the water heater (refer to “To Turn Off The Water Heater” on page
80. · Close all hot water taps. · Operate the relief valve release lever on one of the storage tanks – do not let
the lever snap back or you will damage the valve seat. Operating the lever will release the pressure in the water heater. · Close the isolation valves at the inlet and outlet of the water heater and place a bucket under the cold water inlet. · Undo the unions at the inlet and outlet of the water heater. The heat pump heat exchanger holds 5 to 10 litres of water (model dependent) and will drain into the bucket.
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TROUBLE SHOOTING

· Heat Pump Won’t Start A delay of up to 20 minutes to 2 hours can be experienced before heat pump starts operating
· Incorrect Phase Rotation
PHASE DETECT RELAY
The phase detect relay will open circuit if the heat pump has been wired with incorrect phase rotation or if a phase has failed. Both green and yellow LEDs on the relay will be illuminated if phase rotation is correct. · Alarm light on heat pump controller
If the alarm light is flashing RED, check the alarm by pressing the alarm button. Phone your nearest Rheem Service Department or Accredited Service Agent (or Service Centre in NZ) to inform about the alarm. · Low Ambient Temperature If the ambient air temperature is below set point, the heat pump may not start. Check the control panel of the heat pump. Check outside ambient temperature that shows on the display.
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· Heat pump starts then turns off soon after This could be caused by:
a. Insufficient water flow rate through heat exchanger. Check pipe sizing per chart, check obstructions, check lines and pump are bled, check pump is operating, check temperature rise across inlet and outlet.
Note: Tanks and heat pumps are to be manifolded in Equa-Flow. It is important that the branches to each storage tank ONLY contain a gate or ball valve and union. Fitting of loose jumper valves, non-return valves or pressure limiting valves in the branches or primary flow and return lines between the heat pump and tanks WILL affect performance of the heat pump. b. Refrigerant charge too high? Refer to Alarm. c. Refrigerant charge too low? Refer to Alarm. Turn heat pump off then on again at isolating switch to reset system. · Heat pump compressor excessively noisy Check for correct phase rotation (refer to page 92).
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AUTOMATIC DEFROST
The Rheem Commercial Heat Pump installation can be configured in a number of ways depending on the requirements of the individual installation. Ice may begin to form on the evaporator when the air temperature falls below 7C. The water heating system can be designed to operate in one of two scenarios in low ambient temperature conditions. When auxiliary heating mode is OFF, the heat pump will use reverse refrigerant flow to melt any ice that may form on the evaporator coil when operating in low ambient air temperatures there will be no auxiliary boost. When auxiliary heating mode is ON, the heat pump will use reverse refrigerant flow to melt any ice that may form on the evaporator coil when operating in low ambient air temperatures. At temperatures below 5oC, the heat pump will automatically set back the set point temperature and auxiliary gas or electric water heater will be activated after a set period of time has been exceeded without reaching the set point. Where an auxiliary heating source external to the storage tank is used, a pump circulates water from the storage tanks through the auxiliary water heater until the set temperature is reached. The auxiliary heater should be set to 65°C. For most applications, automatic defrost should be satisfactory to meet the water heating demands.
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Revision Date: WM Version Sept 2023 95

xxxxxxA

References

• Hot Water Cylinders | Solar | Electric & Gas Solutions | Rheem NZ
• Hot Water Cylinders | Solar | Electric & Gas Solutions | Rheem NZ
• Hot Water Cylinders | Solar | Electric & Gas Solutions | Rheem NZ

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