23
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.)
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
Function
OFF
ON
Default settings:
Indoor unit model
SW1 SW1-1 Boiler
WITHOUT Boiler
WITH Boiler
OFF
SW1-2 Heat pump maximum outlet water temperature
55ºC
60ºC
ON *1
SW1-3 DHW tank
WITHOUT DHW tank
WITH DHW tank
OFF
SW1-4 Immersion heater
WITHOUT Immersion heater
WITH Immersion heater
OFF
SW1-5 Booster heater
WITHOUT Booster heater
WITH Booster heater
ON
SW1-6 Booster heater function
For heating only
For heating and DHW
ON
SW1-7 Outdoor unit type
Split type
Packaged type
OFF: E*SC-*M*B
ON :
EHPX-*M*B
SW1-8 Wireless remote controller
WITHOUT Wireless remote controller WITH Wireless remote controller
OFF
SW2 SW2-1 Room thermostat1 input (IN1) logic change
Zone1 operation stop at thermostat short
Zone1 operation stop at thermostat open
OFF
SW2-2 Flow switch1 input (IN2) logic change
Failure detection at short
Failure detection at open
ON
SW2-3 Booster heater capacity restriction
Inactive
Active
OFF: Except
E***-VM2B
ON :
E***-VM2B
SW2-4 Cooling mode function
Inactive
Active
OFF: Except
ERSC-VM2B
ON : ERSC-VM2B
SW2-5
Automatic switch to backup heat source operation
(When outdoor unit stops by error)
Inactive
Active *2
OFF
SW2-6 Mixing tank
WITHOUT Mixing tank
WITH Mixing tank
OFF
SW2-7 2-zone temperature control
Inactive
Active
OFF
SW2-8
—
—
-
OFF
SW3 SW3-1 Room thermostat 2 input (IN6) logic change
Zone2 operation stop at thermostat short
Zone2 operation stop at thermostat open
OFF
SW3-2 Flow switch 2 input (IN3) logic change
Failure detection at short
Failure detection at open
OFF
SW3-3 Flow switch 3 input (IN7) logic change
Failure detection at short
Failure detection at open
OFF
SW3-4 Cooling operation in Zone2
Not in use
In use
OFF
SW3-5 Heating mode function *3
Inactive
Active
OFF
SW3-6
—
—
—
OFF
SW3-7
—
—
—
OFF
SW3-8
—
—
—
OFF
SW4 SW4-1 Multiple outdoor units control
Inactive
Active
OFF
SW4-2 Position of multiple outdoor units control *4
Slave
Master
OFF
SW4-3 LED3 display
Indoor-outdoor communication
Refrigerant address
OFF
SW4-4
—
—
—
OFF
SW4-5 Emergency mode (Heater only operation)
Normal
"Emergency mode (Heater only operation)
(To be activated only when powered ON)"
OFF *5
SW4-6 Emergency mode (Boiler operation)
Normal
"Emergency mode (Boiler operation)
(To be activated only when powered ON)"
OFF *5
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.
SW1
SW4
SW2
SW3
OCH532A
