33
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. 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.)
6-19. 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 below in the table below.
Only an authorised installer can change DIP switch setting under one's own re
-
sponsibility according to the installation condition.
Before changing any switch settings, ensure power supplies to indoor and out
-
door units are isolated/powered off.
SW1
SW3
SW4
SW2
SW5
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
ON
SW1-4 Immersion heater
WITHOUT Immersion heater
WITH Immersion heater
OFF: E**T20*-*C
ON : EH*T20*-*HC*
SW1-5 Booster heater
WITHOUT Booster heater
WITH Booster heater
OFF: E**T20*-M*C*
ON : E**T20*-*M 2/6/9*C
SW1-6 Booster heater function
For heating only
For heating and DHW
OFF: E**T20*-M*C*
ON : E**T20*-*M 2/6/9*C
SW1-7 Outdoor unit type
Split type
Packaged type
OFF: E*ST20*-*M**C*
ON : EHPT20X-*M**C*
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
OFF
SW2-3 Booster heater capacity restriction
Inactive
Active
OFF: Except
EH*T20*-VM2*C
ON : EH*T20*-VM2*C
SW2-4
Cooling mode function
Inactive
Active
OFF: EH*T20*-*M**C*
ON : ERST20*-*M**C
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
*
6
OFF
SW2-8
Flow sensor
WITHOUT Flow sensor
WITH Flow sensor
ON
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
Electric energy meter
WITHOUT Electric energy meter
WITH Electric energy meter
OFF
SW3-5
Heating mode function
*
3
Inactive
Active
ON
SW3-6
2-zone valve ON/OFF control
Inactive
Active
OFF
SW3-7
Heat exchanger for DHW
Coil in tank
External plate HEX
ON
SW3-8 Heat meter
WITHOUT Heat meter
WITH Heat meter
OFF
SW4 SW4-1
—
—
—
OFF
SW4-2
—
—
—
OFF
SW4-3
—
—
—
OFF
SW4-4
Indoor unit only operation (during installation work)
*
4
Inactive
Active
OFF
SW4-5
Emergency mode (Heater only operation)
Normal
Emergency mode (Heater only operation)
OFF
*
5
SW4-6
Emergency mode (Boiler operation)
Normal
Emergency mode (Boiler operation)
OFF
*
5
SW5 SW5-1
—
—
—
OFF
SW5-2 Advanced auto adaptation
*
7
Inactive
Active
OFF: Other than R1/R2 mode
ls
ON: R1/R2 models
SW5-3
SW5-4
SW5-5
SW5-6
SW5-7
SW5-8
—
—
—
OFF
Notes:
*1. When the cylinder unit is connected with a PUMY-P/SUHZ-SW outdoor unit of which maximum outlet water temperature is 55ºC, DIP SW1-2 must be changed to OFF.
*2. External output (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 cylinder unit 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 61. )
*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. SW5-2, "Advanced auto adaptation" is available only for R1 and R2 models.
SW5-3 SW5-4 SW5-5 SW5-6 SW5-7
E*ST20C-*M*C*
ON
ON
ON
ON
OFF
E*ST20D-*M*C*
ON
OFF
OFF
ON
OFF
EHPT20X-*M*C*
OFF
OFF
OFF
OFF
OFF
Capacity code
OCH570C
Summary of Contents for EHPT20X-MHCW
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