90
7-4.
Outdoor unit
control
5) Defrosting control
5-1) Defrost operation
This control defrosts the outdoor heat exchanger. The temperature sensor (TE sensor) of the outdoor heat exchanger
determines frost formation, and then defrosting is performed in the 4-way valve reverse defrosting method.
1) During a heating operation, defrosting is performed when the TE sensor meets any of the conditions in A through D
zones.
2) During defrosting, when TE sensor maintains 12°C or higher for 3 seconds or 7°C ≤ TE < 12°C for a minute, the
defrosting ends. Also, when defrosting continues for 10 minutes even if the TE sensor temperature is below 7°C, the
defrosting ends.
3) After the defrosting, stop the compressor for approx. 40 seconds before starting a heating operation.
4) Switching the jumper "J805" and "J806" of the outdoor control board can change the time of d above mentioned.
(Factory default: 150 minutes)
* ( ): 801, 1101
* ( ): 801, 1101
Item Operation flow and applicable data, etc.
Heating operation starts
-2
-5
-10
-23
(-30)*
TE
[
°C
]
0 10 15 39 39 (45)* 55 [d]
[min]
D zone
A zone
B zone
C zone
*
1
*
1
In 10 to 15 minutes after the heating
operation starts, the lowest value of
TE is recorded as TEO, and the
lowest temperature of To as ToO.
To Normal
A Zone Maintain “(TEO - TE) - (ToO - To) ≥ 3°C” for 20 sec
B Zone Maintain “(TEO - TE) - (ToO - To) ≥ 2°C” for 20 sec
C Zone Maintain “TE ≤ -23 (-30)* °C” for 20 sec
D Zone Accumulate compressor operation status of TE < -2°C for 150 min
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