Panasonic CS-VZ9SKE Service Manual page 90

15.3.4 Cold Draught Prevention Control

When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced.
15.3.5 Deice Operation

When outdoor pipe temperature and outdoor air temperature is low, deice operation starts.

Deice Start condition
Outdoor air temperature sensor 1 detected below 9°C continuously for 40 minutes, outdoor pipe temperature
o
sensor 1 detected below line A for 3 minutes within the next 20 minutes.
Outdoor air temperature sensor1 detects temperature below 9°C continuously for 40 minutes, if the
o
temperature is below line A and line B for 3 minutes.
Heating operation operates without deicing operation continuously for 24 hour, outdoor temperature is below
o
3°C.
 Cannot operate the deicing operation if heating operation operate after 40 minutes starting operation.
Non-stop Heating Deice Operation
Deice without Heating
Operation (Normal Deice)
Without Heating Deice Operation
4-way valve is switched and deicing is performed by cooling cycle.
o
Unit stop heating operation for maximum 12 minutes.
o
During this operation the power indicator blinks and the vertical airflow direction louver is left open.
o
After the deicing start, it'll end with either the elapsed 11 minutes, or the outdoor piping temperature is equal
o
to or greater than the following table of temperature.
Piping Temperature = 0.8 x Air Temperature - 9
-2°C
-4°C
-28°C
2°C
-30°C
(-22°C)
Outdoor Air Temperature Sensor 1
Heating Operation
Deice with Heating Operation
Yes
Ice Melted Judgement
Deice with Heating Operation in standby
Deice with Heating Operation (Retry)
Yes
Deice with Heating Operation in standby
2°C
2°C
Deice Zone
(7°C)
Start condition comply
Deice completed
Duration of piping temperature
No
increase is too long
Heat-charge device reached 30°C - 35°C within
20 minutes or operated for 30 minutes.
Deice completed
Ice Melted Judgement
Duration of piping temperature
No
increase is too long
Operate for 10 minutes
90
Line A
Line B