Mitsubishi Electric EHST20C-VM6HA Service Manual page 20

6-10. Dip switch setting
<Dip Switch Functions>
Located on the FTC3 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 below in the table below.
Dip switch
SW1
SW1-1
Heat pump maximum outlet water
SW1-
temperature
DHW tank
SW1-3
Immersion heater
SW1-4
Booster heater
SW1-5
Booster heater function
SW1-6
Outdoor unit type
SW1-7
Wireless remote controller
SW1-8
Room thermostat input (IN1) logic change
SW
SW-1
Flow switch input (IN2) logic change
SW-
Booster heater capacity restriction
SW-3
SW-4
Automatic switch to backup heater only op-
SW-5
eration (When outdoor unit stops by error)
SW-6
SW-7
SW-8
SW3
SW3-1
SW3-
SW3-3
SW3-4~8
SW4
SW4-1~4
Emergency mode (Heater only operation)
SW4-5
SW4-6
Notes: 1. For packaged model system, the max outlet water temperature is always 60°C so default Dip switch SW1-2 is ON.
For split model system, the max outlet water temperature is usually 55°C except in the case of PUHZ-HRP outdoor model where the max
outlet water temperature is 60°C and DIP switch SW1-2 should be changed to ON.
2. If emergency mode is no longer required, please turn off both outdoor and indoor unit power supply before returning SW4-5 to OFF position.
3. For safety reasons, this function is not available for certain errors. (System operation must be stopped and only pump keeps running.)
External output (OUT11) will be available.
Automatic switch to backup heater only operation
Back-up heater operation (*1) will automatically run when the indoor 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, P8, U1 to U8, Ud, UE, UF, UL, UP
(*1) Prolonged running of the back-up operation may affect the life of the heater.
(*2) For safety reasons, this function is not available for certain faults. (System operation must be stopped and only pump keeps running.)
Function
—
55 °C
WITHOUT DHW tank
WITHOUT immersion heater
WITHOUT booster heater
For heating only
Split type
WITHOUT wireless remote con-
troller
Operation stop at thermostat short Operation stop at thermostat open
Failure detection at short
Inactive
—
Inactive
—
—
—
—
—
—
—
—
Normal
—
OFF
—
60 °C
WITH DHW tank
WITH immersion heater
WITH booster heater
For heating and DHW
Packaged type
WITH wireless remote controller
Failure detection at open
Active
—
Active ( 3)
—
—
—
—
—
—
—
—
Emergency mode (Heater only operation)
(To be activated only when powered ON)
—
0
SW1 SW
SW3
ON Default (Indoor unit Ref.)
OFF
—
OFF:EHS****-*M** ( 1)
ON :EHP****-*M**
ON
OFF:EH*****-*M**
ON :EH*****-*M*H*
ON
ON
OFF:EHS****-*M**
ON :EHP****-*M**
OFF
OFF
ON
OFF
ON: EHPT20X-VM2HA
OFF
—
OFF
OFF
—
OFF
—
OFF
—
OFF
—
OFF
—
— OFF
— OFF
— OFF
OFF ( 2)
OFF
—
SW4