MITSUBISHI ELECTRIC EHPT 15 Ecodan Pre-Plumbed P2 Slimline and Standard Cylinders Instruction Manual

MITSUBISHI ELECTRIC EHPT 15 Ecodan Pre-Plumbed P2 Slimline and Standard

Cylinders

Abbreviations and glossary

temperature compensation
2| COP| Coefficient of Performance the efficiency of the heat pump
3| Cooling mode| Space cooling through fan coils or underfloor cooling
4| Cylinder unit| Indoor unvented DHW tank and component plumbing parts
5| DHW mode| Domestic hot water heating mode for showers, sinks, etc.
6| Flow temperature| The temperature at which water is delivered to the primary circuit
7| Freeze stat. function| Heating control routine to prevent water pipes from freezing
8| FTC| Flow temperature controller, the circuit board in charge of controlling the system
9| Heating mode| Space heating through radiators or Underfloor heating
10| Hydrobox| Indoor unit housing the component plumbing parts (NO DHW tank)
11| Legionella| Bacteria potentially found in plumbing, showers, and water tanks may cause Legionnaires disease
12| LP mode| Legionella prevention mode – a function of systems with water tanks to prevent the growth of legionella bacteria
13| Packaged model| A plate heat exchanger (Refrigerant – Water) in the outdoor heat pump unit
14| PRV| Pressure relief valve
15| Return Temperature| The temperature at which water is delivered from the primary circuit
16| Split model| A plate heat exchanger (Refrigerant – Water) in the indoor unit
17| TRV| Thermostatic radiator valve – a valve on the entrance or exit of the radiator panel to control the heat output

SAFETY PRECAUTIONS

• Before operating this unit it is important to read the safety precautions.
• The following safety points are provided to prevent injury to yourself and damage to the unit – please adhere to them.

Used in this manual

WARNING
Precautions listed under this title should be observed to prevent injury or death to the user.

CAUTION
Precautions listed under this title should be observed to prevent damage to the unit.

• Follow the instructions provided in this manual and local regulations when using this unit.

MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT

| WARNING

(Risk of fire)

| This mark is for R32 refrigerant only. The refrigerant type is written on the nameplate of the outdoor unit. In case the refrigerant type is R32, this unit uses a flammable refrigerant.

If refrigerant leaks and comes in contact with a fire or heating part, it will create harmful gas and there is a risk of fire.

---|---|---
| ****

Read the OPERATION MANUAL carefully before operation.

| Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation.
| ****

Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.

WARNING

• The unit should NOT be installed or serviced by the user. If installed incorrectly water leakage, electric shock, and fire may result.
• NEVER block discharges from emergency valves.
• Do not operate the unit without emergency valves and thermostatic cut-outs being operational. If in doubt contact your installer.
• Do not stand on or lean on the unit.
• Do not place objects on top or below the unit and observe service space requirements when placing objects next to the unit.
• Do not touch the unit or controller with wet hands as electric shock may result.
• Do not remove the panels of the unit or try to force objects inside the unit’s casing.
• Do not touch protruding pipework as it may be very hot and cause burns to the body.
• Should the unit start vibrating or making abnormal noises stop operation, isolate from the power supply and contact the installer.
• Should the unit start to produce any burning smells stop operation, isolate from the power supply and contact the installer.
• Should water be visibly being discharged through the tundish stop operation, isolate from the power supply and contact the installer.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge unless they have been given supervision or instruction concerning the use of the appliance by a person responsible for their safety.
• Children should be supervised to ensure that they do not play with the appliance.
• In the case of a refrigeration leak, stop the operation of the unit, thoroughly ventilate the room and contact the installer.
• If the power supply cable is damaged, it must be replaced by the manufacturer, its service agent, or similarly qualified persons in order to avoid a hazard.
• Do not place containers with liquids on top of the unit. If they leak or spill the unit may be damaged and fire could occur.
• When installing, relocating, or servicing the cylinder unit and the hydro box, use only the heat pump’s specified refrigerant to charge the refrigerant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines. If air is mixed with the refrigerant, then it can cause abnormally high pressure in the refrigerant line and may result in an explosion and other hazards. The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety.
• In heating mode, to avoid the heat emitters being damaged by excessively hot water, set the target flow temperature to a minimum of 2ºC below the maximum allowable temperature of all the heat emitters. For Zone 2, set the target flow temperature to a minimum of 5ºC below the maximum allowable flow temperature of all the heat emitters in the Zone 2 circuit.
• This appliance is primarily intended for domestic use. For commercial applications, this appliance is intended to be used by expert or trained users in shops, in light industry and on farms, or for commercial use by lay persons.
• Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
• The appliance shall be stored in a room without continuously operating ignition sources (for example open flames, an operating gas appliance, or an operating electric heater).
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odor.

CAUTION

• Do not use sharp objects to press the buttons of the main remote controller as this will cause damage to the buttons.
• If the power to the unit is to be turned off for a long time, the water should be drained.
• Do not place a container etc. filled with water on the top panel.

Disposal of the Unit

Note: This symbol mark is for EU countries only. This symbol mark is according to the directive 2012/19/EU Article 14 Information for users and Annex IX, and/or to the directive 2006/66/EC Article 20 Information for end- users and Annex II.

• Your Mitsubishi Electric heating system products have been manufactured with high-quality materials and components which can be recycled and/or reused. The symbol in Figure 1 means that electrical and electronic equipment, batteries, and accumulators at the end of their life, should be disposed of separately from your household waste.

INTRODUCTION

The purpose of this user manual is to inform users how their air source heat pump heating system works, how to run the system at its most efficient, and how to change settings on the main remote controller. If a chemical symbol is printed beneath the symbol (Figure 1), this chemical symbol means that the battery or accumulator contains a heavy metal at a certain concentration. This is indicated as follows; Hg: mercury (0.0005%), Cd: cadmium (0.002%), Pb: lead (0.004%) In the European Union there are separate collection systems for used electrical and electronic products, batteries, and accumulators. Please dispose of this equipment, batteries, and accumulators correctly at your local community waste collection/recycling center. Contact your local Mitsubishi Electric dealer for country-specific details on disposal. Please, help us to conserve the environment we live in. This appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge unless they have been given supervision or instruction concerning the use of the appliance by a person responsible for their safety. Children should be supervised to ensure they do not play with the appliance. This user manual should be kept with the unit or in an accessible place for future reference.

CUSTOMISING SETTINGS FOR YOUR HOME

Main remote controller

• To change the settings of your heating/cooling system please use the main remote controller. The following is a guide to viewing the main settings. Should you require more information please contact your installer or local Mitsubishi Electric dealer.
• Cooling mode is available for ER series only.

Main remote controller parts

system on. Pressing again when the system is switched on will enable Holiday Mode. Holding the button down for 3 secs will turn the system off. ( *1 )
F1-4| Function keys| Used to scroll through the menu and adjust settings. The function is determined by the menu screen visible on screen A.

• When the system is switched off or the power supply is disconnected, the indoor unit protection functions (e.g. freeze stat. function) will NOT operate. Please beware that without these safety functions enabled the indoor unit may potentially become exposed to damage.

Main screen icons

• This unit is on Stand-by whilst another indoor unit(s) is in operation by priority.
• To lock or unlock the Menu, press the BACK and CONFIRM keys simultaneously for 3 seconds.

CUSTOMISING SETTINGS FOR YOUR HOME

General Operation

shown as in the figure on the right. This screen shows the target temperature, space heating mode, DHW mode (ifDHW tank is present in the system), any additional heat sources being used, holiday mode, and the date and time. You should use the function buttons to access more information. When this screen is displayed pressing F1 will display the current status and pressing F4will take the user to the option menu screen.

Option screen

• This screen shows the main operating modes of the system. Use function buttons to switch between Operating (►), Prohibited ( ), and Timer ( ) for DHW and space heating/cooling, or detailed information on energy or capacity.

The options screen allows quick settings of the following;

• Forced DHW (if DHW tank present) — to turn ON/OFF press F1
• DHW operating mode (if DHW tank present) — to change mode press F2
• Space heating/cooling operating mode — to change mode press F3
• Energy monitor

The following accumulated energy values are displayed.

• Consumed electrical energy in total (month-to-date)
• Delivered heat energy in total (month-to-date)
• To monitor the energy values in each operation mode for [month-to-date/ last month/ the month before last/ year-to-date/ last year], press F4 to access to the Energy monitor menu.

Note
If a certain accuracy is required for the monitoring, the method to display captured data from external energy meter(s) should be set up. Contact your installer for further details.

Main Settings Menu

• To access the main settings menu press button B ‘MENU’
• The following menus will be displayed;
• [DHW] (Cylinder unit or hydro box (or FTC BOX) plus locally supplied DHW tank)
• [Heating/Cooling]
• [Schedule timer]
• [Holiday mode]
• [Initial settings]
• [Service] (Password protected)

[Initial Settings]

1. From the main settings menu use F2 and F3 buttons to highlight the ‘Initial settings’ icon and select by pressing CONFIRM.
2. Use F1 and F2 buttons to scroll through the menu list. When the required title is highlighted then press CONFIRM to edit.
3. Use the relevant function buttons to edit each initial setting then press CONFIRM to save the setting.

Initial settings that can be edited are

• [Date/Time] *Be sure to set it to the local standard time.
• [Language]
• [Summer time]
• [Temp. display]
• [Contact number]
• [Time display]
• [°C/°F]
• [Room sensor settings]

To return to the main settings menu press the BACK button.

CUSTOMISING SETTINGS FOR YOUR HOME

[Room sensor settings]

For room sensor settings it is important to choose the correct room sensor depending on the heating mode the system will operate in.

1. From the Initial settings menu select Room sensor settings. Time/Zone schedule setting screen
2. When 2-zone temperature control is active and wireless remote controllers are available, from the Room RC zone select screen, select zone No. to assign to each remote controller.
3. From the Sensor setting screen, select a room sensor to be used for monitoring the room temperature from Zone1 and Zone 2 separately.

• Not specified (if a field-supplied room thermostat is used) Room RC1-8 (one each for Zone1 and Zone2) (if a wireless remote controller is used as a room thermostat)
• From the Sensor setting screen, select Time/Zone to make it possible to use different room sensors according to the time schedule set in the Select Time/Zone menu. The room sensors can be switched up to 4 times within 24 hours.

Domestic Hot Water (DHW)/Legionella Prevention

• The domestic hot water and legionella prevention menus control the operation of  DHW tank heat-ups. DHW mode can run in either ‘Normal’ or ‘Eco’ mode. Normal mode will heat the water in the DHW tank more quickly using the full power of the heat pump. Eco mode takes a little longer to heat the water in the DHW tank but the energy used is reduced. This is because heat pump operation is restricted using signals from the FTC based on measured DHW tank temperature.

Note: The actual energy saved in Eco mode will vary according to outdoor ambient temperature. Return to the DHW/legionella prevention menu.

Forced DHW
The forced DHW function is used to force the system to operate in DHW mode. In normal operation, the water in the DHW tank will be heated either to the set temperature or for the maximum DHW time, whichever occurs first. However, should there be a high demand for hot water ‘Forced DHW’ function can be used to prevent the system from routinely switching to space heating/cooling and continue to provide DHW tank heating. Forced DHW operation is activated by pressing button F1 and Back button in the ‘Option Screen’. After the DHW operation finishes, the system will automatically return to normal operation. To cancel forced DHW operation hold down button F1 in the ‘Option Screen’.

[Heating/Cooling]

The heating/cooling menus deal with space heating/cooling using normally either a radiator, fan-coil, or underfloor heating/cooling system depending on the installation.
There are 3 heating modes

• Heating room temp. (Auto adaptation) ( )
• Heating flow temp. ( )
• Heating compensation curve ( )
• Cooling flow temp. ( )

Room temp. (Auto adaptation) mode

• This mode is explained in detail in the ‘Overview of Controls’ Section.

Flow temp. mode

• The temperature of the water flowing to the heating circuit is set by the installer to best suit the space heating/cooling system design and the user’s desired requirements.

Explanation of compensation curve

• During late spring and summer usually the demand for space heating is reduced.
• To prevent the heat pump from producing excessive flow temperatures for the primary circuit the compensation curve mode can be used to maximize efficiency and reduce running costs.
• The compensation curve is used to restrict the flow temperature of the primary space heating circuit dependent on the outdoor temperature. The FTC uses information from both an outdoor temperature sensor and a temperature sensor on the primary circuit supply to ensure the heat pump is not producing excessive flow temperatures if the weather conditions do not require it.
• Your installer will set the parameters of the graph depending on local conditions and the type of space heating used in your home. It should not be necessary for you to alter these settings. If however, you find that over a reasonable operating period the space heating is not heating or is overheating your home, please contact your installer so they can check your system for any problems and update these settings if necessary.

[Holiday mode]

Holiday mode can be used to keep the system running at lower flow temperatures and thus reduced power usage whilst the property is unoccupied. Holiday mode can run either flow temp., room temp., heating, compensation curve heating, and DHW all at reduced flow temperatures to save energy if the occupier is absent.
From the main menu screen press button E should be pressed. Be careful not to hold down button E for too long as this will turn off the controller and system.
Once the holiday mode activation screen is displayed you can activate/deactivate and select the duration that you would like holiday mode to run for.

• Press button F1 to activate or deactivate holiday mode.
• Use buttons F2, F3, and F4 to input the date on which you would like holiday mode to activate or deactivate holiday mode for space heating.

Editing holiday mode

• Refer to the menu tree in “Main remote controller” of the Installation Manual. Should you require the Holiday mode settings e.g. the flow temp., room temp. to be altered you should contact your installer.

[Schedule timer]

• The scheduled timer can be set in two ways, for example; one for summer and the other for winter. (Refer to as “Schedule 1” and “Schedule 2” respectively.) Once the term (months) for the Schedule 2 is specified, rest of the term will be specified as Schedule 1. In each Schedule, an operational pattern of modes (Heating/ Cooling/DHW) can be set. If no operational pattern is set for Schedule 2, only the pattern for Schedule 1 will be valid. If Schedule 2 is set to full-year (i.e. March to Feb.), only the operational pattern for Schedule 2 will be valid.

• The schedule timer is activated or deactivated in the options screen. (See ‘General Operation’ section)

Setting the Schedule period

1. From the main settings menu use F2 and F3 to highlight the schedule icon then press CONFIRM.
2. The Schedule period preview screen is displayed.
3. To change the Schedule period, press F4. button.
4. The time bar edit screen is displayed.
5. Use F2/F3 button to point at a starting month of Schedule 2, then press CONFIRM.
6. Use F2/F3 button to point at an ending month of Schedule 2, then press CONFIRM.
7. Press F4 to save settings.

Setting the Schedule timer

1. From the main settings menu use F2 and F3 to highlight the schedule icon then press CONFIRM.

2. From the Schedule 2-period preview screen use F1 and F2 to scroll through the selecting each subtitle in turn by pressing CONFIRM.

3. The schedule timer sub menu will be displayed. The icons show the following modes;

   • [Heating]
   • [Cooling]
   • [DHW]

4. Use F2 and F3 buttons to move between mode icons press CONFIRM to be shown the PREVIEW screen for each mode.
   The preview screen allows you to view the current settings. In the 2-zone heating/ cooling operation, press F1 to switch between Zone1 and Zone2. Days of the week are displayed across the top of the screen. Where the day appears underlined the settings are the same for all those days underlined. Hours of the day and night are represented as a bar across the main part of the screen. Where the bar is solid black, space heating/cooling and DHW (whichever is selected) are allowed.

5. In the preview menu screen press the F4 button.

6. First, select the days of the week you wish to schedule.

7. Press F2/F3 buttons to move between days and F1 to check or uncheck the box.

8. When you have selected the days press CONFIRM.

9. The time bar edit screen will be displayed.

10. Use buttons F2/F3 to move to the point at which you do not want the selected mode to be active press CONFIRM to start.

11. Use the F3 button to set the required time of inactivity then press CONFIRM.

12. You can add up to 4 periods of inactivity within a 24-hour interval.

13. Press F4 to save settings.

Notes

• The schedule timer for space heating/cooling and DHW are set in the same way. However, for DHW only time can be used as a scheduling variable.
• A small rubbish bin character is also displayed choosing this icon will delete the last unsaved action.
• It is necessary to use the SAVE function F4 button to save settings. CONFIRM does NOT act as SAVE for this menu.

[Service] Menu

• The service menu is password protected to prevent accidental changes being made to the operation settings, by unauthorized/unqualified persons.

SERVICE AND MAINTENANCE

Troubleshooting

• The following table is to be used as a guide to possible problems. It is not exhaustive and all problems should be investigated by the installer or another competent person.
• Users should not attempt to repair the system themselves.
• At no time should the system be operating with the safety devices bypassed or plugged.

Check schedule settings and change them if necessary.
All hot water from the DHW tank used| Ensure DHW mode is operating and wait for the DHW tank to reheat.
A heat pump or electric heater not working| Contact installer.
The heating system does not get up to the set temperature.| Prohibit, schedule, or holiday mode selected| Check settings and change as appropriate.
Incorrectly sized heat emitters| Contact installer.
The room in which the temperature sensor is located is

at a different temperature from the rest of the house.

| Reposition the temperature sensor to a more suitable room.
Battery problem *wireless control only| Check the battery power and replace it if flat.
The cooling system does not cool down to the set temperature. (ONLY for ER series)| When the water in the circulation circuit is unduly hot, Cooling mode starts with a delay for the protection of the outdoor unit.| Normal operation no action necessary.
When the outdoor ambient temperature is significantly low, the Cooling mode does not start running to avoid freezing of the water pipes.| If the freeze stat. the function is not necessary, contact the installer to change the settings.
After DHW operation room temperature rises a little.| At the end of the DHW mode operation, the 3-way valve diverts hot water away from the DHW tank into the space heating circuit. This is done to prevent the cylinder unit components from overheating. The amount of hot water directed into the space heating circuit is dependent on the type of system and the pipe run between the plate heat exchanger and the cylinder unit.| Normal operation no action necessary.
The heating emitter is hot in the DHW mode. (The room temperature rises.)| The 3-way valve may have foreign objects in it, or hot water may flow to the heating side due to malfunctions.| Contact installer.
The schedule function inhibits the system from operating but the outdoor unit operates.| Freeze stat. the function is active.| Normal operation no action necessary.
The pump runs without reason for a short time.| Pump jam prevention mechanism to inhibit the build-up of scale.| Normal operation no action necessary.
Mechanical noise heard coming from the indoor unit| Heaters switching on/off| Normal operation no action necessary.
3-way valve changing position between DHW and heating mode.| Normal operation no action necessary.
Noisy pipework| Air trapped in the system| Try bleeding radiators (if present) If the symptoms persist contact the installer.
Loose pipework| Contact installer.
Water discharges from one of the relief valves| The system has overheated or overpressurized| Switch off power to the heat pump and any immersion heaters then contact the installer.
Small amounts of water drip from one of the relief valves.| Dirt may be preventing a tight seal in the valve| Twist the valve cap in the direction indicated until a click is heard. This will release a small amount of water flushing dirt from the valve. Be very careful the water released will be hot. Should the valve continue to drip contact the installer as the rubber seal may be damaged and need replacing.
An error code appears in the main remote controller display.| The indoor or outdoor unit is reporting an abnormal condition| Make a note of the error code number and contact the installer.
A heat pump is forced to turn ON and OFF.| Smart grid-ready input (IN11 and IN12) is used, and switch-on and off commands are input.| Normal operation no action necessary.

Power failure

• All setting will be saved for 1 week with no power, after 1 week Date/Time ONLY will be saved.

SERIAL NUMBER

The serial number is indicated on the SPEC NAME PLATE

Please be sure to put the contact address/telephone number on this manual before handing it to the customer.

UNITED KINGDOM

• Mitsubishi Electric Europe
• Living Environmental Systems Division
• Travelers Lane
• Hatfield
• Hertfordshire
• AL10 8XB

A Declaration of Conformity is available on request.

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