Panasonic CS-VZ9SKE Service Manual page 91


Non-stop heating deice operation is prohibited when any of the following condition is met
Protection control that limit capacity.
o
Aluminium electric heater (HEATCHARGE) temperature sensor abnormal.
o
Aluminium electric heater (HEATCHARGE) cycle abnormal.
o
Outdoor pipe temperature sensor 2 abnormal.
o
The outdoor temperature range falls under -30°C.
o

Deice stop condition
Outdoor air temperature is more than 9°C
o
15.3.6 Base Pan Heater Protection Control
Base pan heater it installed inside to the outdoor unit at base pan. It is for quickly melted ice at base pan area.

When outdoor air temperature is 4°C, Base pan heater operation starts.

If the temperature is more than 6°C, base pan heater operation stop.
15.3.7 Aluminium Electric Heater 3-Way Valve Control
Aluminium electric heater 3-way valve temperature sensor is used for the abnormality determination of aluminium
electric heater 3-way valve cycle.
Control condition:
Aluminium electric heater 3-way valve temperature sensor
Outdoor operation

Aluminium electric heater 3-way valve temperature sensor is disconnected or short circuit continuously in 5sec.
Error code H80 will be appear.
Indoor operation

If aluminium electric heater 3-way valve temperature sensor error code (H80) is received, after powerful
operation OFF in 2 minute, the operation will be continues.

If abnormality of aluminium electric heater 3-way valve temperature sensor error code (H80) is received from
outdoor once again, the operation will be continued in the stage of flashing timer.

However, if H80 doesn't come from outdoor within 10 sec after outdoor power turned ON, abnormality will be
cancelled.
Thermo OFF delay - Aluminium electric heater 3-way valve control
Aluminum electric heater 3-way valve will open before thermo OFF to change the room temperature during thermo
OFF and to reduce loss during thermo ON >.
Start condition
1 Heater ON or compressor ON.
2 Control area is continued more than 90 second.
3 Not in protection operating of capacity limit.
4 Not in de-icing operation.
5 Temperature of outdoor piping temperature is greater than or equal to -3°C.
6 Indoor piping temperature is greater than or equal to 35°C.
7 More than 5 hours after deice completed.
8 After more than 20 minute.
9 Compressor frequency (Hz) is the control area as below.
Outdoor air temperature
4°C
OFF
ON
Outdoor air temperature
91
6°C