Dip Switch Setting; Automatic Switch To Heat Source Only Operation - Mitsubishi Electric EHSC-VM2B Service Manual

6-11. Dip switch setting

Located on the FTC4 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 power supplies to indoor and out-
door units are isolated/powered off.
Dip switch
SW1 SW1-1 Boiler
SW1-2 Heat pump maximum outlet water temperature
SW1-3 DHW tank
SW1-4 Immersion heater
SW1-5 Booster heater
SW1-6 Booster heater function
SW1-7 Outdoor unit type
SW1-8 Wireless remote controller
SW2 SW2-1 Room thermostat1 input (IN1) logic change
SW2-2 Flow switch1 input (IN2) logic change
SW2-3 Booster heater capacity restriction
SW2-4 Cooling mode function
Automatic switch to backup heat source operation
SW2-5
(When outdoor unit stops by error)
SW2-6 Mixing tank
SW2-7 2-zone temperature control
SW2-8
SW3 SW3-1 Room thermostat 2 input (IN6) logic change
SW3-2 Flow switch 2 input (IN3) logic change
SW3-3 Flow switch 3 input (IN7) logic change
SW3-4 Cooling operation in Zone2
SW3-5 Heating mode function *3
SW3-6
SW3-7
SW3-8
SW4 SW4-1 Multiple outdoor units control
SW4-2 Position of multiple outdoor units control *4
SW4-3 LED3 display
SW4-4
SW4-5 Emergency mode (Heater only operation)
SW4-6 Emergency mode (Boiler operation)
Note: 1. When the hydrobox is connected with a PUHZ-RP outdoor unit of which maximum outlet water temperature is 55ºC, Dip SW1-2 must be changed to OFF.
2. OUT11 will be available. 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.)
3 This switch functions only when the hydrobox is connected with a PUHZ-FRP outdoor unit. When another type of outdoor unit is connected,
the heating mode function is active regardless of the fact that this switch is ON or OFF.
4. SW4-2 is available only when SW4-1 is ON.
5. If emergency mode is no longer required, return the switch to OFF position.

Automatic switch to heat source only 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.
During the back-up operation, an error code(s) and the contact number will be displayed alternately.
External output (OUT11) will be available.
To clear the fault(s), reset the power breakers on the indoor and outdoor units.
<Applicable error codes (*2)>
E6 to E9, ED, P6, P8, U1 to U8, UD, UE, UF, UL, 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.)
OCH532A
Function
WITHOUT Boiler
55ºC
WITHOUT DHW tank
WITHOUT Immersion heater
WITHOUT Booster heater
For heating only
Split type
WITHOUT Wireless remote controller WITH Wireless remote controller
Zone1 operation stop at thermostat short Zone1 operation stop at thermostat open
Failure detection at short
Inactive
Inactive
Inactive
WITHOUT Mixing tank
Inactive
—
Zone2 operation stop at thermostat short Zone2 operation stop at thermostat open
Failure detection at short
Failure detection at short
Not in use
Inactive
—
—
—
Inactive
Slave
Indoor-outdoor communication
—
Normal
Normal
OFF
WITH Boiler
60ºC
WITH DHW tank
WITH Immersion heater
WITH Booster heater
For heating and DHW
Packaged type
Failure detection at open
Active
Active
Active *2
WITH Mixing tank
Active
— -
Failure detection at open
Failure detection at open
In use
Active
—
—
—
Active
Master
Refrigerant address
—
"Emergency mode (Heater only operation)
(To be activated only when powered ON)"
"Emergency mode (Boiler operation)
(To be activated only when powered ON)"
23
SW4
SW2
SW3
Default settings:
ON
Indoor unit model
OFF
ON *1
OFF
OFF
ON
ON
OFF: E*SC-*M*B
ON : EHPX-*M*B
OFF
OFF
ON
OFF: Except
E***-VM2B
ON : E***-VM2B
OFF: Except
ERSC-VM2B
ON : ERSC-VM2B
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
— OFF
— OFF
— OFF
OFF
OFF
OFF
— OFF
OFF *5
OFF *5
SW1