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
o Outdoor air temperature sensor 1 detected below 9°C continuously for 40 minutes, outdoor pipe temperature
sensor 1 detected below line A for 3 minutes within the next 20 minutes.
o Outdoor air temperature sensor1 detects temperature below 9°C continuously for 40 minutes, if the
temperature is below line A and line B for 3 minutes.
o Heating operation operates without deicing operation continuously for 24 hour, outdoor temperature is below
3°C.
Cannot operate the deicing operation if heating operation operate after 40 minutes starting operation.
Piping Temperature = 0.8 x Air Temperature - 9
Outdoor Air Temperature Sensor 1
Deice Zone
Line
Line B
Outdoor Pipe Temperature Sensor 1
-2°C
-4°C
-28°C
-30°C
(-22°C) (7°C)
2°C
2°C
2°C
Non-stop Heating Deice Operation
Operate for 10 minutes
Heating Operation
Ice Melted Judgement
Deice with Heating Operation (Retry)
Deice without Heating
Operation (Normal Deice)
Start condition comply
Deice completed
Duration of piping temperature
increase is too long
Duration of piping temperature
increase is too long
Deice completed
Deice with Heating Operation
Deice with Heating Operation in standby
Deice with Heating Operation in standby
Yes
Yes
No
No
Heat-charge device reached 30°C - 35°C within
20 minutes or operated for 30 minutes.
Ice Melted Judgement
Without Heating Deice Operation
o 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
to or greater than the following table of temperature.
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