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INSTALLER SETTING
144
General - Backup heater release temp.
Depending on local climate conditions, it is necessary to change the temperature condition in
which backup heater is released. The backup heater operates in 'Bivalent-parallel' to heat pump
cycle. It means, below the set outside temperature is released, but it will only run if the target
temperature is not reached by cycle.
NOTE
DIP switches SW2-6/7 defines if half or full capacity of electric heater is used to support the
heating. If full capacity is enabled, the steps are released based on gap between target and
actual temperature.
Min. required
Backup heater
capacity
Min. required
Heat pump
capacity
① Heat pump only
② Heat pump+ Backup heater support
③ Backup heater only (Emergency operation)
Capacity
3
2
T
T
TOL
1)
2)
Design
Bivalent
1) TOL = -28 °C (R290 Mono)
2) Heating design temp. (Seasonal auto temp/Outdoor temp/O1)
3) General/Backup heater release temp
4) No heating temp. (Seasonal auto temp/Outdoor temp/O2)
1
3)
Outside
temp.
T
4)
Off
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