Mitsubishi Electric EHGT17D-YM9ED, Service Manual

Page: 42 / 98

42
OCH722A
Indoor unit only operation
Water circuit
Necessary
Heat pump
Not necessary
Main remote controller Necessary
DIP switch setting on the FTC
controller board setting
Electric heater
SW4-4 ON, SW4-5 ON
Boiler
SW4-4 ON, SW4-6 ON
Setting range for flow temp. 20–60°C Selectable
Setting range for tank temp. 40–60 ° C Selectable
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.
Emergency operation
Water circuit
Necessary
Heat pump
Not necessary
Main remote controller Not necessary
DIP switch setting on the FTC
controller board
Electric heater
SW4-5 ON
Boiler
SW4-6 ON
Setting range for flow temp.
Fixed at 40 ° C
Setting range for tank temp.
Fixed at 50 ° C *1
*1 Default setting is 50
°
C. Once system has started running,
emergency operation runs at the latest set temp.
WARNING
Do not attempt to change the DIP switches whilst the breaker(s) are ON as this could result in ELECTROCUTION.