Panasonic WH-UD05JE5 Service Manual page 143

14.6.2 Room Heater Operation during Deice
Purpose:

To protect the indoor Heat Exchanger from ice forming and prevent heat exchanger plate breakage.
Control content:

This Heater protection control will activate only if the backup heater is enable at custom setup by remote
controller. Once fulfil the start condition, room heater will turn ON together (base on max heater capacity
selection) and stop together if stop condition is fulfilled.
* If the heater is request to turn ON OLP feedback will be detected.
Starting conditions:
1. During normal deice operation 4~9
2. Water outlet temperature < 10°C or
3. Outdoor air temperature < -10°C or
4. Water inlet temperature < 27°C
Heater operates when 1 ~2 fulfilled OR When 1 and 3 ~ 4 is fulfilled.
However, this control does not relate to Heater ON/OFF button on remote control.
Stop condition:

When normal deice end or

Water outlet temperature > 45°C
However, room heater keeps ON if indoor electric heater control activate.
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