Dip Switch Setting; Automatic Switch To Heat Source Only Operation; Applicable Error Codes - Mitsubishi Electric EHSD-MEC.UK Service Manual

6-6. DIP switch setting

Located on the FTC printed circuit board are 5 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.
Make sure to turn off both indoor unit and outdoor unit power supplies before
changing the switch settings.
DIP switch Function
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 Flow sensor
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 Electric energy meter
SW3-5 Heating mode function *3
SW3-6 2-zone valve ON/OFF control
SW3-7 Heat exchanger for DHW
SW3-8 Heat meter
SW4 SW4-1 Multiple outdoor units control
SW4-2 Position of multiple outdoor units control *7
SW4-3
SW4-4 Indoor unit only operation (during installation work) *4
SW4-5 Emergency mode (Heater only operation)
SW4-6 Emergency mode (Boiler operation)
SW5 SW5-1 DHW tank water temperature over heat protection (L4) Active
SW5-2
SW5-3
SW5-4
SW5-5
SW5-6
SW5-7
SW5-8
Note:
*1. When the hydrobox is connected with a PUHZ-RP/SUHZ-SW 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. Space heating and DHW can be operated only in indoor unit, like an electric boiler. (Refer to "Indoor unit only operation" in page 40. )
*5. If emergency mode is no longer required, return the switch to OFF position.
*6. Active only when SW3-6 is set to OFF.
*7. Active only when SW4-1 is set to ON.
*8. Please make sure to have necessary overheat protection on locally supplied solar thermal system side to secure safety, as the tank temperature coulld be much higher (than current).

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 er-
ror 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.)
OCH571
WITHOUT Boiler
55ºC
WITHOUT DHW tank
WITHOUT Immersion heater
WITHOUT Booster heater
For heating only
Split type
WITHOUT Wireless remote controller
Zone1 operation stop at thermostat short
Failure detection at short
Inactive
Inactive
Inactive
WITHOUT Mixing tank
Inactive
WITHOUT Flow sensor
Zone2 operation stop at thermostat short Zone2 operation stop at thermostat open OFF
Failure detection at short
Failure detection at short
WITHOUT Electric energy meter
Inactive
Inactive
Coil in tank
WITHOUT Heat meter
Inactive
Slave
—
Inactive
Normal
Normal
—
SW5-3
E*SC-*M*C ON
E*SD-*M*C ON
EHPX-*M*C OFF
—
OFF
WITH Boiler
60ºC
WITH DHW tank
WITH Immersion heater
WITH Booster heater
For heating and DHW
Packaged type
WITH Wireless remote controller
Zone1 operation stop at thermostat open
Failure detection at open
Active
Active
Active *2
WITH Mixing tank
Active *6
WITH Flow sensor
Failure detection at open
Failure detection at open
WITH Electric energy meter
Active
Active
External plate HEX
WITH Heat meter
Active
Master
—
Active
Emergency mode (Heater only operation)
Emergency mode (Boiler operation)
Inactive *8
—
Capacity code
SW5-4 SW5-5 SW5-6 SW5-7
ON ON ON OFF
OFF OFF ON OFF
OFF OFF OFF OFF
—
15
Default settings:
ON
Indoor unit model
OFF
ON *1
OFF
OFF
OFF: E***-M*C
ON : E***-*M2/6/9C
OFF: E***-M*C
ON : E***-*M2/6/9C
OFF: E*S*-*M*C
ON : EHPX-*M*C
OFF
OFF
OFF
OFF: Except E***-VM2*C
ON : E***-VM2*C
OFF: Except ERS*-*M**C
ON : ERS*-*M**C
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
— OFF
OFF
OFF *5
OFF *5
OFF
— OFF
— OFF
SW5
SW4
SW3
SW2
SW1