Mitsubishi Electric EHGT17D-YM9ED Service Manual page 42

Water circuit only operation
When in water circuit only operation the FTC controller board has control functions.
<Heater>
Heating for DHW and space heating is provided by the heater.
• Activating water circuit only operation mode
To activate water circuit only operation see the following:
1. Change DIP switch SW4-4 and SW4-5 on the FTC controller board to ON.
2. Switch ON the breaker(s).
3. Water circuit only operation is now activated.
• Deactivating water circuit only operation mode
To deactivate water circuit only operation see the following:
1. Change DIP switch SW4-4 and SW4-5 on the FTC controller board to OFF.
2. Switch ON the breaker(s).
3. Water circuit only operation is now deactivated.
<Boiler>
Heating for space heating is provided by the boiler.
• Activating water circuit only operation mode
To activate water circuit only operation see the following:
1. Change DIP switch SW4-4 and SW4-6 on the FTC controller board to ON.
2. Switch ON the breaker(s).
3. Water circuit only operation is now activated.
• Deactivating water circuit only operation mode
To deactivate water circuit only operation see the following:
1. Change DIP switch SW4-4 and SW4-6 on the FTC controller board to OFF.
2. Switch ON the breaker(s).
3. Water circuit only operation is now deactivated.
Emergency operation
In emergency operation, an operation without connecting and main remote controller is possible.
When in Emergency operation the main control has NO control functions.
Space heating flow temp. is restarted 40°C and DHW tank temp. is restricted 50°C. *1
<Heater>
Heating for DHW and space heating is provided by the heater.
• Activating emergency operation mode
To activate emergency operation see the following:
1. Change DIP switch SW4-5 on the FTC controller board to ON.
2. Switch ON the breaker(s).
3. Emergency operation is now activated.
• Deactivating emergency operation mode
To deactivate emergency operation see the following:
1. Change DIP switch SW4-5 on the FTC controller board to OFF.
2. Switch ON the breaker(s).
3. Emergency operation is now deactivated.
<Boiler>
Heating for space heating is provided by the boiler.
• Activating emergency operation mode
To activate emergency operation see the following:
1. Change DIP switch SW4-6 on the FTC controller board to ON.
2. Switch ON the breaker(s).
3. Emergency operation is now activated.
• Deactivating emergency operation mode
To deactivate emergency operation see the following:
1. Change DIP switch SW4-6 on the FTC controller board to OFF.
2. Switch ON the breaker(s).
3. Emergency operation is now deactivated.
WARNING
Do not attempt to change the DIP switches whilst the breaker(s) are ON as this could result in ELECTROCUTION.
OCH722A
Water circuit
Heat pump
Main remote controller
DIP switch setting on the FTC
controller board setting
Setting range for flow temp.
Setting range for tank temp.
Water circuit
Heat pump
Main remote controller
DIP switch setting on the FTC
controller board
Setting range for flow temp.
Setting range for tank temp.
*1 Default setting is 50°C. Once system has started running,
emergency operation runs at the latest set temp.
42
Indoor unit only operation
Necessary
Not necessary
Necessary
Electric heater
SW4-4 ON, SW4-5 ON
Boiler
SW4-4 ON, SW4-6 ON
20–60°C Selectable
40–60°C Selectable
Emergency operation
Necessary
Not necessary
Not necessary
Electric heater
SW4-5 ON
Boiler
SW4-6 ON
Fixed at 40°C
Fixed at 50°C *1