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5
.
C
O
N
T
R
O
L
M
O
5
.
C
O
N
T
R
O
L
M
O
interruption is lifted.
4.3.8 Overcurrent protection in heating
Same as cooling.
4.3.9 The compressor discharge temperature too high protection
Same with the cooling-run mode.
4.3.10 Defrost
4.3.10.1 Conditions for the judgment for frosting
Condition 1: The compressor has been kept operating for a certain time (50 minutes)
Condition 2:
When T
≥3℃, T
outdoor ambient
When T
< 3℃, T
outdoor ambient
minutes.
If both conditions set out above are met at the same time, then it is judged that
frosting has taken place.
4.3.10.2 Defrosting operation
The outdoor fan stops;
The compressor's operating frequency drops , the 4-way valve is closed, and then
goes up at a certain frequency for operation.
4.3.10.3 Conditions for the Completion of Defrosting
The defrosting run lasts for more than a certain time(12 minutes)
The outdoor coils temperature ≥ 12
If either of the above conditions is met, it judges that frosts have been cleared off.
4.310.4 Operations to end defrosting
The compressor frequency goes down at a rate, and the compressor get interrupted;
50 s later the 4-way valve opens up, and 10 s more both the compressor and the
outdoor fan restarts in normal operation.
4.4 Dehumidifying mode
In this mode, the fan speed being set at low and the function of fan speed changing
not active.
The dehumidifying mode is illustrated as follows:
Indoor Ambient Temperature
Tset
D
E
D
E
≤ -3℃, and maintains for 5 minutes.
outdoor condenser
-T
outdoor ambient
outdoor condenser
0
C
17
A
S
-
1
8
U
R
4
S
T
V
A
S
-
1
8
U
R
4
S
T
V
≥7℃, and maintains for 5
.
U
H
1
U
H
1
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