Panasonic WH-ADC0916G9E8, Service Manual, Page: 96 / 205

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14.3 Protection Control for Cooling Operation
14.3.1 Outdoor Air Temperature Control

The Compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.

This control will begin 1 minute after the compressor starts.

Compressor frequency will adjust base on outdoor air temperature.
14.3.2 Freeze Prevention Control 1
1 When indoor heat exchanger temperature is lower than 0°C continuously for 10 seconds, compressor will
stop operating.
2 Compressor will resume its operation three minutes after the indoor heat exchanger is higher than 1°C.
3 Indoor heat exchanger freeze prevention (H99) will memory in error history.
14.4 Heat Exchanger (HEX) Protection Control
Start Condition:

When outdoor ambient temperature is less than 10°C
Control Details:

Heater will turn ON and heat pump turn OFF when water inlet temperature below 10°C.

Heater will turn OFF and heat pump turn ON when water inlet temperature increase more than 12°C
End Condition:

When outdoor ambient temperature is more than 13°C
However this control will take place 29 minutes after compressor restart.
Limited
requency
Free
25°C
22°C
Water Inlet
10°C
12°
Free Zone
(Compressor ON, Heater OFF)
Deice (Compressor OFF,
Heater ON)