69
8-4.
Outdoor unit
control
6) Defrosting control
6-1) 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)
Item
Operation flow and applicable data, etc.
Heating operation starts
-2
-5
-10
-23
TE
[
°C
]
0
10
15
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 °C" for 20 sec
D Zone
Accumulate compressor operation status of TE < -2 °C for 150 min
AMP Air Conditioning
www.ampair.co.uk | [email protected]
