Panasonic WH-SDF09C3E5 Service Manual page 86

14.2.2 Deice Operation
When outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motor
stop.
14.2.3 Heat-exchanger (hot water coil) protection control
Backup heater ON condition:-
water inlet temperature < 23°C AND
o
outdoor ambient temperature < 10°C
o
Backup heater OFF condition:-
water inlet temperature > 25°C OR
o
outdoor ambient temperature > 13°C
o
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