Mitsubishi Electric EHPT20Q-VM2EA Service Manual page 10

6-2 DIP Switch Functions
Located on the FTC printed circuit board are 4 sets of small white switches
known as DIP switches. The DIP switch number is printed on the circuit board
next to the relevant switches. The word ON is printed on the circuit board and on
the DIP switch block itself. To move the switch you will need to use a pin or the
corner of a thin metal ruler or similar.
DIP switch settings are listed in the table below.
Before changing any switch settings, ensure the power supplies to both cylinder
unit and outdoor unit are turned OFF.
Before changing the DIP switch setting, confirm that the power supply earth
cable is securely connected and prevent the FTC from being applied with static
electricity (e.g. touch a case body etc.). Otherwise, it may cause a failure of the
FTC due to the static electricity.
DIP switch
SW1 SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
SW1-6
SW1-7
SW1-8 Wireless remote controller
SW2 SW2-1 Room thermostat1 input (IN1) logic change
SW2-2
SW2-3
SW2-4
Automatic switch to backup heat source operation
SW2-5
(When outdoor unit stops by error)
SW2-6
SW2-7
SW2-8
SW3 SW3-1 Room thermostat 2 input (IN6) logic change
SW3-2
SW3-3
SW3-4 Electric energy meter
SW3-5
SW3-6 2-zone valve ON/OFF control
SW3-7
SW3-8 Heat meter
SW4 SW4-1
SW4-2
SW4-3
SW4-4 Indoor unit only operation (during installation work) *2
SW4-5 Emergency mode (Heater only operation)
SW4-6
Note: *1. For safety reasons, this function is not available for certain errors.
(In that case, system operation MUST be stopped and only the water circulation pump keeps running.)
*2. Space heating and DHW can be operated only in indoor unit, like an electric boiler. (Refer to Installation manual "5.4 Indoor unit only operation". )
*3. If emergency mode is no longer required, return the switch to OFF position.
Automatic switch to backup heat source operation
Back-up heat source operation (*1) will automatically run when the outdoor unit stops abnormally. To enable the function, switch DIP SW 2-5 to ON.
To clear the fault(s), reset the power breaker on the indoor unit.
<Applicable error codes (*2)>
E6 to E9, EC, FC, FD, U1 to U4, UP
(*1) Prolonged running of the back-up operation may affect the life of the heat source.
(*2) For safety reasons, this function is not available for certain faults. (System operation must be stopped and only pump keeps running.)
GCH15010
Function
—
—
—
—
—
—
—
WITHOUT Wireless remote controller WITH Wireless remote controller
Zone1 operation stop at thermostat short Zone1 operation stop at thermostat open
—
—
—
Inactive
—
—
—
Zone2 operation stop at thermostat short Zone2 operation stop at thermostat open
—
—
WITHOUT Electric energy meter
—
Inactive
—
WITHOUT Heat meter
—
—
—
Inactive
Normal
—
OFF
—
—
—
—
—
—
—
—
—
—
Active *1
—
—
—
—
—
WITH Electric energy meter
—
Active
—
WITH Heat meter
—
—
—
Active
Emergency mode (Heater only operation) OFF *3
—
10
OFF ON
1
SW4
6
1
SW3
8
1
SW2
8
1
SW1
8
Default settings:
ON
Indoor unit model
— OFF
— OFF
— OFF
— OFF
— OFF
— OFF
— OFF
OFF
OFF
— OFF
— OFF
— OFF
OFF
— OFF
— OFF
— OFF
OFF
— OFF
— OFF
OFF
— OFF
OFF
— OFF
OFF
— OFF
— OFF
— OFF
OFF
— OFF