Mitsubishi Electric EHSD-MED Service Manual page 42

Indoor unit only operation
In indoor unit only operation, operation without connecting outdoor unit is possible.
During Indoor unit only operation, the main control has control functions.
<Heater>
Heating for DHW and space heating is provided by the heater.
• Activating indoor unit only operation mode
To activate indoor unit only operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-4 and SW4-5 to ON.
3. Switch ON the breaker(s).
4. Indoor unit only operation is now activated.
• Deactivating indoor unit only operation mode
To deactivate indoor unit only operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-4 and SW4-5 to OFF.
3. Switch ON the breaker(s).
4. Indoor unit only operation is now deactivated.
<Boiler>
Heating for space heating is provided by the boiler.
• Activating indoor unit only operation mode
To activate indoor unit only operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-4 and SW4-6 to ON.
3. Switch ON the breaker(s).
4. Indoor unit only operation is now activated.
• Deactivating indoor unit only operation mode
To deactivate indoor unit only operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-4 and SW4-6 to OFF.
3. Switch ON the breaker(s).
4. Indoor unit only operation is now deactivated.
Emergency operation
In emergency operation, operation without connecting outdoor unit and main remote controller is pos-
sible.
During 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.
<Heater>
Heating for DHW and space heating is provided by the heater.
• Activating emergency operation mode
To activate emergency operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-5 to ON.
3. Switch ON the breaker(s).
4. Emergency operation is now activated.
• Deactivating emergency operation mode
To deactivate emergency operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-5 to OFF.
3. Switch ON the breaker(s).
4. 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. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-6 to ON.
3. Switch ON the breaker(s).
4. Emergency operation is now activated.
• Deactivating emergency operation mode
To deactivate emergency operation, see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if hydrobox is powered independently).
2. Change DIP switch SW4-6 to OFF.
3. Switch ON the breaker(s).
4. 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 electric shock.
OCH712C
Indoor unit
Heat pump
Main remote controller
DIP switch setting
Setting range for flow temp. 20 to 60°C Selectable
Setting range for tank temp. 40 to 60°C Selectable
Indoor unit
Heat pump
Main remote controller
*1
DIP switch setting
Setting range for flow temp. Fixed at 40°C
Setting range for tank temp. Fixed at 50°C *
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
Emergency operation
Necessary
Not necessary
Not necessary
Electric heater
SW4-5 ON
Boiler
SW4-6 ON
1