temperzone OPA 1400/2100 OPA Outdoor Air Cooled Packaged Units Instruction Manual

OPA 1400/2100 OPA Outdoor Air Cooled Packaged Units

Product Information: OPA 1400/2100 RKTMF-P (Eco Ultra) c/w UC8 Air Cooled

Packaged Units – Reverse Cycle – R410A

The OPA Outdoor Air Cooled Packaged units are designed to provide optimum performance, reliability, and durability in reverse cycle cooling and heating. The units utilize four independent refrigeration systems and four inverter compressors to provide flexibility and economy of four-stage operation. Each refrigeration system is charged with HFC-410A (R410A) refrigerant. The compressors are of the inverter scroll type and use polyolester oil (POE) lubricant.

Installation Instructions

General

Follow national and regional regulations and bylaws, National Health and Safety regulations, and local regulations on maximum boundary noise when installing the unit to avoid personal injuries.

Clearances & Service Access

Refer to the Specification Sheet provided for minimum clearances. If multiple units are to be placed side-by-side, allow at least 2m between coil faces. Access to the filter access door should be considered when designing return and supply air ductwork.
Access to the filters can also be achieved by removing the return air access door.

Mounting

The unit should be fastened to a firm flat horizontal base using the holes supplied in the mounting channels. When installing the unit on a roof, it is recommended that the unit be installed on a
substantial structure with vibration isolating pads or mounts. If placed on the ground or concrete pad, use rubber pads or mounts to give 20mm min. ground clearance. Flexible duct connections are
recommended between the supply and return ducts and the unit.
Remove wooden blocks installed under the compressors before starting the unit.

Condensate Drains

The condensate drains should be `U’ trapped outside the unit.
The traps should have a vertical height of at least 100 mm. The drain lines should have a slope of at least 1 in 50 and must not be piped to a level above the unit drain pipe.

Refrigeration System Instructions

General

The OPA 1400/2100 has four independent refrigeration systems and four inverter compressors to provide the flexibility and economy of four-stage operation. Each refrigeration system has been charged with HFC-410A (R410A) refrigerant.

Compressors

The compressors are inverter scroll type. The compressor lubricant is polyolester oil (POE). Note, this oil absorbs moisture quickly if exposed to open air.

Wiring Instructions

Electrical Requirements

Electrical work must be done by a qualified electrician. The unit must be wired directly from a distribution board using an appropriately sized circuit breaker based on AS/NZS 3000. The termination point for the mains cable in the unit is at the isolator switch. Isolate mains power before working on the unit, and only qualified persons who are competent in service and maintenance tasks should perform electrical work.

GENERAL

Temperzone OPA Outdoor Air Cooled Packaged units.
Follow these instructions to ensure the optimum performance, reliability and durability.
Units must be installed in accordance with all national and regional regulations and bylaws. National Health and Safety regulations must be followed to avoid personal injuries.
The appropriate local permits must be acquired and adhered to.
Local regulations on maximum boundary noise need to be considered when positioning the unit.

INSTALLATION

Clearances & Service Access
Refer to Specification Sheet supplied for minimum clearances. If multiple units are to be placed side-by-side then allow at least 2m between coil faces.
Filter slides are fitted within the unit. Access to the filter access door should be considered when designing return and supply air ductwork. Access to the filters can  also be achieved by removing the return air access door.

Mounting
The unit should be fastened to a firm flat horizontal base using the holes supplied in the mounting channels. When the unit is being installed on a roof it is recommended that the unit is installed on a substantial structure with vibration isolating pads or mounts. If placed on the ground or concrete pad, use rubber pads or mounts to give 20mm min. ground clearance.
Flexible duct connections are recommended between the supply and return ducts and the unit.

Unit is shipped with wooden blocks installed under the compressors. Ensure these blocks are removed from the compressor feet prior to starting the unit (not required for operation).

Condensate Drains
The condensate drains should be ‘U’ trapped outside the unit. The traps should have a vertical height of at least 100 mm. The drain lines should have a slope of at least 1 in 50 and must not be piped to a level above the unit drain pipe.

REFRIGERATION SYSTEM

General
The OPA 1400/2100 has four independent refrigeration systems and four inverter compressors to provide the flexibility and economy of four stage operation, i.e. utilizing one to four systems as conditions vary, plus the advantage of staggered starting, all stages being variable for improved control and system efficiency.
Each refrigeration system has been charged with HFC-410A (R410A) refrigerant; refer Specifications document for amount.

Compressors
The compressors are inverter scroll type. The compressor lubricant is polyolester oil (POE). Note, this oil absorbs moisture quickly if exposed to open air.

WIRING

Electrical Requirements
Electrical work must be done by a qualified electrician.
DANGER! LIVE ELECTRICAL CONNECTIONS. ISOLATE MAINS POWER BEFORE WORKING ON UNIT. ONLY QUALIFIED PERSONS WHO ARE COMPETENTLY TRAINED SHOULD PERFORM SERVICE AND MAINTENANCE TASKS.
The unit must be wired directly from a distribution board using an appropriately sized circuit breaker based on AS/NZS 3000. The termination point for the mains cable in the unit is at the isolator switch.

Note: DO NOT USE REWIRABLE FUSES.

Controls Wiring
Before wiring, the method of control should be established from the following list. Follow specific instructions in the following sections. Section 4.3 is important to all sections.

Carel c.pCO connections| | | Factory Fitted| BMS

Bacnet/ Modbus

| BMS -Low

Level Controller

| Stand alone
---|---|---|---|---|---|---
Sensor| Pin| Signal| | | |
Room Temp.| U1| 0-10VDC| Note 1| Note 3| ×| √
Room RH%| U2| 0-10VDC| Note 1| Note 3| ×| √
ID Fan Speed Req| U3| 0-10VDC| ×| Note 2
RA Temp.| U4| 0-10VDC| √| √| √| √
RA RH%| U5| 0-10VDC| √| Note 4
SA Temp.| U6| 0-10VDC| √| √| √| √
SA RH%| U7| 0-10VDC| √| √| √| √

Sensors & Inputs
See table below for sensors and inputs required for each control method.

See table below for sensors and inputs required for each control method.

Notes:

1. Factory supplied loose, fit as required in controlled space.
2. Optionally provide 0-10VDC control of indoor fan speed, will be overridden if written to BACnet or Modbus indoor fan speed register. Can also be set using a Carel pGD.
3. Room temperature and RH% can be written via BACnet or Modbus and will take priority over sensor reading, in this case sensors are not required to be fitted.
4. RA sensors only required for Economiser option. If RA to be used to control the space then wire RA sensors into the Room temperature and Room RH% inputs.

BMS – BACnet Interface

1. Install ethernet cat 5 STP shielded cable between the port shown in the below diagram of the Carel c. pCO controller and the network switch of the BMS. The default IP address of the controller is 192.168.1.10; refer Controls Setup (p.9) for details on how to change.
2. Temperature and humidity sensors can be connected directly to the Carel c.pCO controller (see specification sheet for wiring diagram). Alternately the space temperature and humidity can be written by the BMS to BACnet objects which will take priority over any sensors that are connected.

Single unit to BMS:

Multiple units using a network switch:

BMS – Modbus Connection
Connect to supplied terminals in electrical box, see technical document for wiring detail, sheet 2 sheet reference DO, reproduced below.

Figure 1: RS485 terminal block in electrical box

Figure 2: Carel recommendations for shield grounding

BMS – Low Level
Provide the controller with 24VAC input signals from external controller.

• Enable – turn operation of unit on and off.
• Heat – Room temperature is below set point (heating required).
• Capacity – 0-10VDC signal based on capacity required.
• Dehum – On, prioritize moisture removal.

An output for unit fault is provided (NO7).

Stand Alone

Option 1:

1. Install optional Carel pGD remote display (Item no. 201- 000-379) inside building, connection to c.pCO J10 port. Cable RJ-45.
2. Connect Room temperature and humidity sensor directly to Carel c.pCO controller. See Specification sheet for wiring schematic/sheet 2 for wiring details of Room temperature input) and Room RH%.

Option 2:
In absence of a Carel remote pGD the unit can be controlled using the onboard master controller with its included digital display.

Low Level
Where a third party control or thermostat outputs switched 24V signals and a capaciy signal.

Economiser Wiring
See Specifications document for wiring schematic/ sheet 1, lower left corner.

START-UP PROCEDURE

Before starting the compressors

1. Before working on the unit isolate mains power.
2. Remove the shipping blocks from beneath each compressor. Check that each compressor is securely mounted.
3. Check oil level as per label attached to each compressor.
4. Check the mains power and controls wiring are correct.
5. Check tightness of all electrical connections.
6. Check the air filters have been correctly installed.
7. Check that all indoor fan motors can freely rotate.
8. Check the supply voltage between each phase and neutral.
9. Check air diffusers and ductwork are open.
10. Apply mains power to the unit by closing the mains isolating switch.
11. Before starting the compressors a four hour delay period is required to allow the crankcase heaters to drive any liquid refrigerant out of the compressor oil. Mains power must be switched on during this four hour delay period.

Master Controller Display

Home page display:

Main Menu:

A detailed Master Controller User Guide is supplied with the unit, and available at www.temperzone.biz; model search ‘OPA 2100’.

Commissioning
After the four hour delay period has expired (see step 10 in section 5.1) complete the following procedure. You can use the Commissioning Sheet (supplied with the unit) to help you.

1. From the initial screen of the Master Controller press program button to bring up the Main menu.
2. Scroll down and select ‘B settings’.
3. Scroll down and select ‘Commission’.
4. The first page shows Airflow setup. Enter the required Air flow in l/s. (refer Note below)
5. Measure air flows from duct work to verify air flows.
6. Scroll down to the next page, ‘Commission Systems’.
7. On this page is a list of all systems, each system can be turned on and the capacity set.
8. Turn each system on in isolation. Leave the capacity at the default 75%. Allow to run checking for any unusual noises or vibrations.
9. Measure the current draw on each phase to the compressor motor and to each fan motor. Check the readings against the specified values in the wiring diagram or Specification sheet.
10. Check each refrigeration system’s information, from the Main menu select ‘Information’, then ‘UC8’ (refer Appendix I for more detail). Also check Information/Power usage.
11. Return to Main menu/Settings/Commission to repeat step 7 to 9 with each system individually.
12. Run all systems simultaneously as a final check.
13. Touch up any outdoor unit paintwork damage to prevent corrosion.

Note:
Setting the indoor fan speed too low can bring risk of frost forming on the indoor coil with potential nuisance frost protection trips on cooling, possibly even unit lock-out, and/or HP trips on heating.
Setting the indoor fan speed too high can bring a risk of blowing moisture off the fins of the indoor coil and into the supply air duct. Water could then start leaking from the supply air grilles and corrosion of ducting may occur.

Setting the indoor fan speed too high can also bring a risk of ‘over- condensing’ (when the unit is heating) which in turn could cause the unit to perform more outdoor coil de-ice cycles than necessary.
Outdoor fans do not necessarily start rotating immediately after the compressor is started. The fans may run-on for a short period after the compressor stops.

OPERATION

BMS – BACnet
Configure the IP address as required, see Appendix for details.
Once connected to the BMS server, to start the unit via BACnet if the room temperature and RH% sensors are connected directly to the controller and the indoor fan speed has been set using the PGD then all that needs to be done is to write to the below BACnet objects.

Type| Object Instance| Object Name| Read/Write| Units| Default| Range| Description
---|---|---|---|---|---|---|---
BinaryValue| 1| BMS_OnOff| RW| Bool| 0| 0 to 1| Enable Unit to run
AnalogValue| 30| BMS_RoomTCool SP| RW| °C| 22| 5 to 35| Cooling SP, must be

heat SP
AnalogValue| 31| BMS_RoomTHeat SP| RW| °C| 20| 5 to 35| Heat SP, must be < cool SP

If the Room temperature and RH% are measured by the BMS then the below objects also need to be written.

Type| Object Instance| Object Name| Read/Write| Units| Default| Range| Description
---|---|---|---|---|---|---|---
AnalogValue| 36| BMS_RoomT| RW| °C| –| 5-35| Room temperature written by BMS
AnalogValue| 37| BMS_RoomRH| RW| RH%| –| 0-100| Room RH% written by BMS.
BinaryValue| 4| BMS_RoomTRH ORide| RW| Bool| 0| Bool| Use BACnet Room temp and RH (BMSRoomT and BMS Room_RH) for control

To adjust the air flow via BACnet the following object need to be written.

Type| Object Instance| Object Name| Read/Write| Units| Default| Range| Description
---|---|---|---|---|---|---|---
AnalogValue| 44| BMS_

AirFlowSetpoint

| RW| l/s| 10000| 0-13750| Air flow l/s setpoint

BMS Modbus
For information regarding using Modbus commands, please ask temperzone.

Stand Alone
Adjusting the set points:

1.Press Program button     .to bring up the Main Menu|
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2.Select B.Settings, Login information will then be needed. Default password is 0001, this can be changed by user.|
3.Select Setpoint|
4.Press enter then use Up/Down keys to adjust the value or press enter key to move to the next value.|
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5.Scroll down to the next page. Adjust the RoomRH Setpoint. The setting for the high latent point can also be adjusted, when the room conditions are above this level the capacity will increase to bring the space under control faster. The value needs to be larger than the RoomRH set point.|
6. Scroll to the next page. If the reheat coils are fitted, then the supply air temperature when in dehumidification mode (temperature in dead band and RH above room RH set point) can be adjusted. The setting is an offset from the current room cooling set point.|
7.Scroll to the next page. If the reheat coils are fitted then a minimum supply air can be set. There are two control modes available, the first allows setting the supply air to a fixed value, the second mode is an auto function that offsets the supply air above the current room dew point, the aim being to prevent moisture formation on duct work.|
8. Scroll down to the next page. Here the selection can be changed from the default Standard to High Sensible, High Latent or Custom setting. Each of these presets changes the offset from the current set dew point (calculated from the set room temperature and RH%) to determine the target evaporating temperature. The condensing temperature for heating is a fixed value. The set point values shown on this page are based on the current room set points along with the comfort.|
9. Scroll down to the next page. If the Economizer dampers are fitted, the minimum and maximum closed and open positions can be set. (nb OA = Outdoor Air, ie fresh air)|
10. Scroll down to the next page. If the Spill Air dampers are fitted, the minimum and maximum closed and open positions can be set.|
11. Scroll down to the next page. A pressure sensor is factory fitted to the indoor fans allowing the air flow to be automatically controlled. Set the flow in l/s. The settings for the PI control are also on this page, leave as factory set.|
12. On the next screen you can set whether the indoor fan runs when the room conditions have been achieved.|
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13. The following screen allows the adjustment of the set points when an unoccupied request is received.|

To power on the unit from the controller follow the below instructions:

1. From the main screen, use the up and down keys to select the ON/Off symbol as shown in the screen in the lower righthand corner. Press enter.|
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2.  At the next screen use the Up/Down Key to turn the unit On then press enter to confirm.|

ECONOMISER

Economiser Option
The Economiser package that is factory fitted consists of two opposed blade dampers, one for the fresh air and the other for the return air. They come complete with individual damper motors controllable from a 0–10V dc or 24V ac signal. The package also includes a weatherhood assembly that is usually supplied as a separate item for fitting on site.
If the outdoor enthalpy and temperature is below that of the return air, the fresh air damper can be opened and the return air damper closed to provide the first stage of cooling.
It is important that the installation instructions for the fitting of the weatherhood are followed otherwise it is possible some water ingress from rain could occur.
The fresh air damper’s adjustable stop can be set such that it does not close 100%. Many installations may require
a minimum fresh air introduction of 10–15% (refer local Building Code regulations) and the stop may be set on site to facilitate this. Ensure the air flow is equal between full return air and full Economiser by adjusting the damper stops on both Return and Fresh air dampers.
As previously mentioned a 0–10V dc control signal is required to drive the dampers open and closed. This is supplied by the Master Controller (c.PCO), which opens the economiser based on enthalpy measurements of the fresh air and return air.
Air Quality (CO2) sensors can be used to proportionally control the fresh and return air dampers (via the BMS control system).

MAINTENANCE

WARNING HAZARDOUS VOLTAGE. ENSURE ALL POWER SUPPLIES ARE ISOLATED BEFORE PERFORMING MAINTENANCE. FAILURE TO ISOLATE POWER CAN LEAD TO SERIOUS INJURY.

Monthly

1. Check air filters and vacuum or wash clean as necessary.
2. Check condensate drain for free drainage.
3. Check compressor compartment for oil stains indicating refrigerant leaks.
4. Check system operating pressures via the Carel c. PCO controller (refer Appendix I).

Every Three Months

1. Check operation of Economiser dampers.
2. Check for obstruction of Economiser dampers.

Six Monthly

1. Check the tightness of electrical connections.
2. Check for signs of corrosion on electrical connections in high salt atmospheres; replace where necessary.
3. Check the tightness of all fans, motor mountings
4. Check system operating pressures via the Carel
5. PCO controller (refer Appendix I).
6. Check and/or replace indoor air filters
7. Check condensate drain for free drainage.

Yearly

1. Check all refrigerant piping for chafing and vibration.

2. Check air supply at all diffusers

3. Check for excessive noise and vibration and correct as necessary.

4. Check for insulation and duct damage and repair as necessary.

5. Check for excessive noise and vibration and correct as necessary.

6. Check for insulation and duct damage and repair as necessary

7. Check system operating pressures via the Carel
   c. PCO controller (refer Appendix I).

8. Remove lint and dust accumulation from outdoor coil fins with soft brush or low pressure water spray. In corrosive environments, the checking and cleaning frequency should be increased.

9. Touch up any paintwork damage to prevent corrosion.

TROUBLESHOOTING

Room temperature varies significantly from its setting

• Unit may have been incorrectly sized for the building.
• Drafts from wrongly placed supply air diffusers or from the back of the wall plaque could be affecting the temperature sensor built into the wall plaque.
• Poor air circulation in the room can cause incorrect temperature readings.

Air conditioner does not seem to deliver the heating when most needed

• Heating capacity at design conditions may be incorrect. As the outside temperature falls, heat losses through the walls, floor and ceiling increase.
• Check the unit’s brochure for information on the minimum/ maximum operating temperatures.

When heating, units have de-icing cycles built in to remove ice on the outdoor coil.

• This usually means reversing the cycle for a few minutes during which time there is no heating and in fact a little cooling can occur.

In a new building, why does it take some days before the air conditioning heat pump unit seems to work properly

• Many new buildings, especially a commercial buildings, have a large amount of concrete and other structural materials that are generally cold and full of moisture. This is most evident in the winter when trying to heat the building from scratch.

Unit is leaking water

• Check the drain trap/vent/slope.
• Water carry-over: Reduce the maximum fan speed.

Air conditioner runs excessively – the temperature remains too hot in summer or too cold in winter.

• Windows or doors may be opened to non conditioned areas.
• Keep doors to unconditioned areas closed.
• Leaves, papers or other items blocking air flow over the outdoor unit coil.
• Location of wall controller or remote temperature sensor is incorrect.
• Check for leaks in supply or return air ductwork.

Unit displays an error code:

• Refer to UC8 Controller label on the unit for operation & fault diagnostics information or visit www.temperzone.biz; model search ‘UC8 Controller’.
• Press the Alarm button on the pGD to list the most recent faults. Refer OPA 2100 Controller Manual for an explanation.

WARRANTY

Please refer to the separate warranty document supplied with the unit, or visit www.temperzone.biz for details.

Australia:
[email protected] [email protected] Telephone: 1800 21 1800

New Zealand:
[email protected] Telephone: 0800 TZWARRANTY (899 2777)

APPENDIX I

CONTROLS SET-UP : IP ADDRESS
The default IP address of the controller is ‘192.168.1.10’. To change follow the below instructions.

1. Press Alarm and Enter together for 3 seconds to access the system menu|
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2. Scroll to ‘TCP/IP settings’ and press Enter button|
3.Select Settings: DHCP: OFF
Enter an address in the same subnet set on the PC, for example:
IP: 192.168.0.1
MASK: 255.255.255.
Select Update configuration –> Yes|

APPENDIX II
MASTER CONTROLLER : SYSTEM INFORMATION

1.Press Program button     .to bring up the Main Menu Select ‘A. Information’.|
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2. Select ‘UC8’.
There are four separate UC8 controllers in an OPA 2100 – one per refrigeration system.|
3. UC8 Info. screens. These show the UC8 controller variables such as suction superheat, expansion valve position, etc. Refer table below for key to abbreviations:

Abbrev..     Description

OAT       Ambient Temp. °C DeICe  De-ice sensor temp. °C SLT   Suction line temp. °C EvapT  Evaporation temp. °C DLT    Discharge line temp. °C CondT Condenser temp. °C SSH     Suction superheat K DSH   Discharge superheat K ODF Outdoor fan speed

IDF              Indoor fan speed

HP               Discharge pressure kPa

LP                Suction pressure kPa EXV1          Expansion valve A % EXV2 Expansion valve B % OCT            Outdoor Coil Temp. °C ICT Indoor Coil Temp. °C

| ****

4.  Scroll down to see UC8 systems 2 to 4.|
5. Press Program button to return to the Main Menu|

APPENDIX III
UC8 PROTECTION FUNCTIONS

Each OPA Eco Ultra unit utilises four UC8 Controllers, one for each refrigeration system. The UC8 controllers receive requests from the Master Controller such as
‘Unit On/Off’, ‘Start compressors’, ‘Activate HEAT
(Reverse Cycle)’ and transfer the requests to the outputs after enforcing safety timers.
Each UC8 implements system protection functions such as indoor coil frost, extreme high and low pressures, rapid on-off cycling of the compressors, loss of refrigerant and more.
The following applies to all protection functions except where otherwise indicated:
Unit operating capacity may automatically be reduced before a protection function is activated. Such a reduction may be sufficient to prevent an actual trip from occurring.
When a compressor is stopped by a protection function it is held off for a period of 3 minutes, after which it is allowed to restart (provided the cause of the trip has cleared).
When a protection function is active and when a unit is locked out the alarm relay output “FLT” is active.
For more information about protection functions and troubleshooting, refer to document “UC8 Troubleshooting”, available at www.temperzone.biz website; model search ‘UC8’.

1. High pressure protection (HP)
   OPA Eco Ultra units are fitted with high pressure transducers connected to UC8 input HPT. A compressor is switched off when the discharge line pressure reading exceeds 4238 kPa.
   The display shows the letters ‘HP’ when protection is active.

2. Low pressure protection (LP)
   OPA Eco Ultra units are fitted with low pressure transducers connected to UC8 input LPT. A compressor is switched off when the suction line pressure reading falls below 228 kPa.
   The display shows the letters ‘LP’ when protection is active.

3. Indoor coil frost protection
   When the unit is cooling the evaporating temperature in the indoor coil should remain above -8°C. If this temperature falls below -8°C then ice (frost) likely will form on the indoor coil. If the low temperature persists for longer than 6 minutes then the protection function activates.
   When indoor coil frost protection is activated the compressor is stopped for 6 minutes, after which it is allowed to restart.

4. High discharge line temperature protection
   The controller monitors the compressor discharge line temperature via a sensor connected to input ‘DL’ (red wires). The compressor is stopped when:

   • The temperature rises above 110°C for longer than 30 minutes.
   • The temperature rises above 120°C (immediate action).
   • The display shows the message ‘Hi-t’ when protection is active.

5. High discharge superheat protection
   Discharge superheat is defined as the difference between the compressor discharge gas temperature and the condensing temperature. When this temperature differential becomes very high it is an indication that the compressor is being starved of refrigerant gas. Common reasons for this could be a lack of refrigerant (under-charged or loss-of-charge) or a problem with the expansion device (for example a stuck accurator or loose wiring to an EEV).
   The protection is activated when discharge superheat exceeds 45K for longer than 30 minutes.
   The display shows the message ‘Hi-dSH’ when protection is active.

6. Low discharge superheat protection
   Discharge superheat is defined as the difference between the compressor discharge gas temperature and the condensing temperature. When this temperature differential stays very low it can be an indication that the compressor is being flooded with liquid refrigerant. Common reasons for this could be an excess of refrigerant (over-charged) or a problem with the expansion device (for example a stuck accurator or loose wiring to an EEV).
   The protection is activated when discharge superheat remains below the threshold for longer than 15 minutes. The threshold varies linearly from 0K at standard mode minimum capacity (40%) to 10K at nominal capacity (100%).
   This protection function is disabled when a compressor operates at less than standard mode minimum capacity (< 40%).
   The threshold for a variable speed compressor operated in boost mode (capacity above 100%) is fixed at 10K.
   The display shows the message ‘LO-dSH’ when protection is active.

7. High evaporation temperature / high suction line temperature protection
   When the unit has a low pressure transducer connected to the compressor suction line then the controller calculates the evaporating temperature from the suction line pressure reading. If the unit does not have a low pressure transducer then the controller finds the evaporating temperature via a coil temperature sensor (input IC when the unit is cooling, input OC when the unit is heating, yellow wires). Additionally the controller monitors the compressor suction line temperature via a sensor connected to input ‘SL’ (white wires).
   The protection function stops the compressor when:

   • The evaporating temperature remains above 27.5°C for longer than 15 minutes.
   • The suction line temperature remains above 30°C for longer than 15 minutes.
     The display shows the message ‘Hi-SL’ when protection is active.

8. Other alarms
   The Master Controller performs many other protection functions. For example:

   • Signals from sensors and transducers must remain inside normal operating range.
   • Modbus RTU communications with connected devices (e.g. TZT-100 or a Carel Power+ inverter) must continue uninterrupted.
   • Modbus RTU communications with a controller such as a BMS that is controlling the unit must continue uninterrupted.
     Refer to document ‘UC8 Troubleshooting Guide’ for details.

9. Lock-out
   Each protection function has a trip counter. A trip counter is reset to 0 whenever the compressor run request is removed. Any trip that has occurred more than 12 hours ago is removed from the trip count. For some protection functions, when the trip counter reaches value 3 (i.e. three consecutive trips occur) then the unit is “locked out”.
   When a unit is locked out the compressor is not allowed to start. Lock-out is designed to protect the compressor from repeatedly starting when a serious fault exists that requires the attention of a service technician.
   The display shows the code of the fault that caused the lock-out condition.
   A unit that is locked out can be unlocked using any one of the following methods:

   • Remove mains power from the unit for at least 3 seconds, then restore power.
   • Issue an ‘unlock’ command via Modbus RTU serial communications.
   • Reset the controller via Modbus RTU serial communications.

10. Safety timers
    Each UC8 slave controller receives control signals and transfers the signals to the outputs after enforcing safety timers and other protection functions. If the compressor is held off, or held on, by a safety timer then the display shows message ‘H-O-L-d’.
    Normal durations of safety timers are:

    • Minimum off time 3 minutes
    • Minimum run time 1.5 minutes
      Min. cycle time 6 minutes (up to 10 compressor starts per hour)
      Min. mode change-over time 10 minutes (cooling to heating or vice -versa)
      Note:
      If a unit operates on low capacity for extended periods then the unit may periodically perform oil flush cycles. Under such operating conditions compressor lubricating oil may slowly settle in parts of the refrigeration system other than the compressor; oil flush cycles help to return the lubricating oil to the compressor. During an oil flush cycle compressor capacity is increased to a certain minimum. The duration of an oil flush cycle is 1 minute.

APPENDIX IV

AIR HANDLING PERFORMANCE
Note: Airflows are for a dry coil. Reduce airflow by 10% in high moisture removal conditions.. As filters thickness varies, the fan air flows given are for units installed without filters.

OPA 1400RKTMF-P

OPA 2100RKTMF-P

NB Air Flow Selection
If air returning to the indoor coil is regularly expected to be above 50% relative humidity then the coil face velocity should be limited to 2.5m/s or less (refer air flow graph above)
Consideration must be given to selecting a airflow and coil face velocity that avoids water carry – over problems i.e. in high humidity (tropical/subtropical) conditions or when heavily moisture laden fresh air is introduced

Branches
Auckland
(Head Office and Manufacturing)
Sydney
(Australian Head Office and Manufacturing)
Wellington, Christchurch
Brisbane, Melbourne, Adelaide
Singapore, Shanghai

Distributors
Perth, Hobart, Newcastle
Singapore, Shanghai, Beijing, Jakarta, Hong Kong, Sri Lanka, Mauritius, Bangalore, Bangkok, Hanoi, Cambodia, South Pacific Islands, Bangladesh

www.temperzone.biz

Documents / Resources

| temperzone OPA 1400/2100 OPA Outdoor Air Cooled Packaged Units [pdf] Instruction Manual
OPA 1400 2100 OPA Outdoor Air Cooled Packaged Units, OPA 1400, 2100 OPA Outdoor Air Cooled Packaged Units, Air Cooled Packaged Units, Cooled Packaged Units, Packaged Units
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