The discharge piping from the emergency/safety devices of the cylinder unit must be installed according to local law. Do not use the hot water produced by the heat pump directly for drinking or cooking. Annual maintenance checks on both the cylinder unit and the outdoor unit should be done by a qualified person.
Do not mix with any other coolant and do not allow air to remain in the lines. If the power to the cylinder unit must be turned off (or the system shut down) for a long time, the water must be drained. Make sure the insides of the pipes are clean and free of any harmful contaminants such as sulfuric compounds, oxidizing agents, debris or dust.
6 WIRING DIAGRAM
6-10. Dip switch setting
Automatic switch to backup heater only operation
If emergency mode is no longer required, please turn off both outdoor and indoor unit power supply before returning SW4-5 to OFF position
FIELD WIRING7
Cylinder unit powered via outdoor unit
Install an earth longer than other cables
The power supply MUST have sufficient capacity for each heater and ALL electrical loads. Insufficient power supply may result in chattering of load contactor(s)
The circuit breaker must be fitted to ensure the disconnection of all active phase conductors from the supply. Indoor unit/outdoor unit connecting cords should not be lighter than polychloroprene sheathed flexible cord. Draft 60245 IEC 57) The power supply cables of the indoor unit must not be lighter than the polychloroprene sheathed flexible cable.
Draft 60227 IEC 53) The power cables of the indoor unit must not be lighter than the polychloroprene sheathed flexible cable. The installer MUST apply label A included with the manuals near each cylinder and outdoor unit wiring diagram. The installer MUST apply label A included with the manuals near each cylinder and outdoor unit wiring diagram.
WATER SYSTEM DIAGRAM8
EHST20C-*M*HA / *M*A
EHST20C-VM6SA
EHPT20X-VM2HA
EHPT20X-*M*HA / *M*A
It is the installer's responsibility to decide whether antifreeze solution should be used in split systems depending on site conditions.
Filling the cylinder unit
Draining the cylinder unit
Filling the cylinder unit (Potable/DHW circuit)
CONTROLS9
9-2. Service Menu
Auxiliary Setting
When filling the system, the pump and 3-way valve can be manually bypassed using the manual operating mode. From the service menu, use the F1 and F2 keys to scroll through the list until Manual Operation is highlighted. When the tank filling is complete, the installer must enter this menu again and press F3 to disable the part's manual operation.
Otherwise, after 2 hours, the manual operation mode will no longer be active and the FTC3 will resume part control. Manual operation and heat source setting cannot be selected if the system is running. A screen will appear asking the installer to stop the system before these modes are enabled.
The OUT13 output of the 2-way valve 2 forms an inversion of the OUT4 output of the 2-way valve 1. Function setting allows the setting of auto-recovery only after power failure. NB Changes can ONLY be made to Mode 1. 1 - Power failure automatic recovery NOT available 2 - Power failure automatic recovery AVAILABLE. The default heat source setting is heat pump and all electric heaters present in the system to be operational.
In the service menu, use the F1 and F2 buttons to scroll through the list until Heat Source Setup is highlighted. To return to the service menu without saving the setting, press the return button.
Operation Setting Menu
This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC3 collects and processes data for the auto-adjust mode. Use F1 and F2 buttons from the Operation Settings menu to scroll through the list until Room Temp. Use F1 and F2 buttons to select 'Temp.
This function shows current temperature and other data of main components of both the indoor and outdoor units. Since only four digits can be displayed at once, the software version number is displayed in two halves. Enter code 190 to see the first four digits and code 191 to see the last four digits.
162 Indoor unit - Dip SW1 setting information See detailed content described in the following — 163 Indoor unit - Dip SW2 setting information See detailed content described in the following — 164 Indoor unit - Dip SW3 setting information See detailed content described in the following — 165 Indoor unit - Dip SW4 setting information See detailed content described in the following — 175 Indoor unit - Output signal information See detailed content described in the following — 176 Indoor unit - Input signal information See detailed content described in the following.
Indoor unit switch setting display (Request code: 162 to 165)
OFF 1: ON
Output signal display (Request code: 175)
Indoor unit switch setting display (Request code: 175)
Input signal display (Request code: 176)
Ltemp Legionella hot water temp Hroom Target room temp. for heating Lfreq Operation Legionella Frequency Hflow Target temp. The fault history allows the service engineer to view previous fault codes, the unit address and the date they occurred. You can store up to 16 error codes in the history, and the most recent error event is displayed at the top of the list.
Password protection is provided to prevent unauthorized access to the service menu by uninstructed persons. In the service menu, use the F1 and F2 buttons to scroll through the list until Password Protection is highlighted. When the password entry screen is displayed, use the F1 and F2 buttons to move left and right between the four digits, F3 to decrease the selected number by 1, and F4 to increase the selected number by 1.
If you forget the password you entered, or need to service a unit that someone else installed, you can reset the password to the factory default of 0000. You will be asked if you want to continue and reset the password to default. If at any time you want to restore the factory settings, you must use the manual reset function.
From the service menu, use the F1 and F2 buttons to scroll through the list until Manual reset is highlighted. Heating for DHW and space heating is provided by the booster heater and tank immersion heater (if installed). The space heating supply temperature is limited to 40°C. If there is no electric heating element on the DHW tank, the booster heater will also indirectly heat the DHW.
The only function is to display the main screen and information screen by pressing F1, all other buttons are disabled.
TROUBLESHOOTING10
10-1. Troubleshooting
10-2. Test Run
10-3. Malfunction diagnosis method by main controller
Error code Display title and conditions Possible cause Diagnosis and action L1 Booster heater overheating detection. If more head is required either add a pump of the same size or replace the existing pump with the capacity model.
10-4. Self diagnosis and action
Error code Title and display conditions Possible cause Diagnosis and action L3 Circulating water temperature overheated. Error code Title and display conditions Possible cause Diagnosis and action L6 Circulation water freeze protection. Error code E0 is displayed if main controller receives no signal from the indoor unit for ref.
Error code E4 is displayed if the indoor unit does not receive data from the main controller for 3 minutes or if the indoor unit does not receive a signal from the main controller for 2 minutes. 1 Contact fault with transmission cable 1 Check the connection cable for damage or loose connections at the FTC3 and main controller terminals. If the E4 code is still displayed, the FTC3 and/or Main Controller PCB must be replaced.
Error code E3 is displayed if the main controller does not find an empty transmission path and therefore cannot transmit for 6 seconds or the data received by the main controller differs from what was sent (by the main controller) 30 consecutive times. 2 Fault with main controller transmission/. Turn the power to the indoor unit OFF and then ON. If the E3/E5 code is still displayed, the FTC3 and/or the main control circuit board must be replaced.
Error code Title and display condition Possible cause Diagnosis and action E7 Indoor/outdoor communication error. E1/E2 Main Controller Control Board Error Error code E1 is displayed if the main controller cannot access its non-volatile (non-power dependent) memory. Error code J0 is displayed when the FTC3 cannot receive data from the wireless receiver for 1 min.
An error code is displayed if the wireless receiver receives no/incomplete data from the wireless remote control for 15 consecutive minutes.
10-5. Troubleshooting by inferior phenomena
The booster heater's thermal shutdown has tripped and cannot be reset with the manual reset button. Check the resistance of the thermal cutout, if it is open, the connection is broken and the booster heater needs to be replaced. Check plumbing/wiring to 3-way valve. i) Operate 3-way valve manually using the main remote controller. ii) Replace 3-way valve spool.
The room in which the temperature sensor is located has a different temperature than the rest of the house. The booster heater's thermal shutdown has activated and can. not reset with the manual reset button. Check the resistance of the thermal cutout, if 0 then the connection is broken and the booster heater will need to be replaced.
Check the plumbing/wiring to the 3-way valve. i) Operate the 3-way valve manually with the main remote control. ii) Replace the 3-way valve coil. At the end of operation in domestic water mode, the 3-way valve redirects the hot water from the heater to the room heating circuit. 3-way valve error Check the 3-way valve. i) Manually operate the 3-way valve with the master remote control. ii) Replace the 3-way valve coil.
10-6. Checking Component Parts' Function
Earth leakage breaker for heater If a short circuit occurs on the booster heater, immersion heater or each power line, a short circuit breaker will trip and power source will be blocked. When the applied voltage is not 230V AC across the terminals A1-A2, check that the terminals R-U, S-V and T-W are open. When the applied voltage is 230V AC across the terminals A1-A2, make sure that the terminals R-U, S-V and T-W are shorted.
Vane vertical (Flow < 5.5 l/min) Open Except open Vane inclined (Flow > 5.5 l/min) Short Other than short.
10-7. Test point diagram FTC3 (Controller board)
DISASSEMBLY PROCEDURE PHOTOS & ILLUSTRATION
How to remove the front panel
11 DISASSEMBLY PROCEDURE
How to remove the main controller
DISASSEMBLY PROCEDURE PHOTOS
Note
To avoid dropping of the breaker, hold the breaker by hand when removing the last screws
To avoid dropping of the contactors, hold the contac- tors by hand when removing the last screws
Note:To avoid dropping of the terminal block, hold the terminal block by hand when removing the screw
CNBHT connector
THW3 connector
How to remove the control box
(3) Disconnect only the wiring leads in the control box. connected to the components in the cylinder unit.
Disconnect the field wiring as necessary
Swing
How to remove water pump/ pump valve
How to remove the flow switch
How to remove the booster heater
How to remove the thermostat/immersion heater
SUPPLEMENTARY INFORMATION.)
How to remove the expansion vessel
How to remove the air vent (manual)
Pipe side
How to remove the drain cock (sanitary circuit) (1) Remove the front panel. (Refer to Procedure 1.)
How to remove the flexible hose
Between the plate heat exchanger and the booster heater (1) Remove the plate heat exchanger from the cylinder unit
DHW tank side
How to remove the back panel
Refer to procedure 1.) (2) Remove the side panels. 4) Remove the 2 screws on the back panel and pull the back panel while lifting the top panel.
THW3)
THW3 cable
Notes on replacing the parts
12 SUPPLEMENTARY INFORMATION
13 SERVICE AND MAINTENANCE
Engineers form
Annual Maintenance Log Book
