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6.4.2 Defrosting control
Condition of defrosting:
If any one of the following items is satisfied, system
will enter into the defrosting cycle.
After the compressor starts up and keeps running,
marks the minimum value of T3 from the 10th
minute to 15th minute as T30.
1) If the compressor’s cumulate running time is up
to 29 minutes and T3< TCDI1, T3＋
T30SUBT3ONE ≦ T30.
2) If the compressor’s cumulate running time is up
to 35 minutes and T3< TCDI2, T3＋
T30SUBT3TWO ≦ T30.
3) If the compressor’s cumulate running time is up
to 40 minutes and T3< -24C for 3 minutes.
4) If the compressor’s cumulate running time is up
to 120 minutes and T3<-15℃.
Condition of ending defrosting cycle:
If any one of the following items is satisfied, the
defrosting will finish and the system will switch to
normal heating mode.
----T3 rises to be higher than TCDE1℃.
----T3 keeps to be higher than TCDE2℃ for 80
seconds.
----The system has run for 10 minutes in defrosting
mode.
Defrosting action：
off on
Cool‐F9
10S 30S
TimeA
10S
4‐wayvalve defrosting Defrostingover
compressor
Indoorfan
Outdoorfan
EXVopen
frequency
Max10minutes
frequency
Compressorstops
off
Anti‐coldcontrol
off
480P 480Pfor240s
Condition of ending defrosting:
If any one of following items is satisfied, defrosting
will stop and the system will switch to normal heating
mode.
① T3 > TempQuitDefrost_ADD ℃;.
② The defrosting time reaches 10min.
③ Turn to other modes or off.
6.4.3 Outdoor fan control
6.4.3.1 Cooling mode
Normally the system will choose the running fan
speed according to ambient temperature:
Outdoo
r
℃
45
43 Supper high fan speed
28
26 High fan speed
25
23 Middle fan speed
22
20 Low fan speed
19
17 Supper low fan speed
10
9 Breeze fan speed
0
-1 F fan speed
-5
-6 G fan speed
-10
-11 H fan speed
I fan speed
When low ambient cooling is active:
Outdoor fan speed control logic (low ambient
cooling)
When T4 <15 ℃ (59 ℉) and T3 < 30 ℃ (86 ℉), the
unit will enter into low ambient cooling mode. The
outdoor fan will choose speed according to T3.
When T3≥38 ℃ (100.4 ℉) or when T4≥20 ℃ (68
℉), the outdoor fan will choose the speed according
to T4 again.
38
Exit low ambient cooling
mode
, run with high fan
for 1 minute
Low
30
27
23
off
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