Service Manual

Then modify it according to T2 average
(correction):
Note:Average value of T2：Sum T2 value of all
indoor units)/ (indoor units number
ºF T2 average
Decrease frequency
117
Keep frequency
104 Increase frequency
According to the final capacity request to
confirm the operating frequency, as following
table.
Frequency (Hz)
0
HEAT
_F1
HEAT
_F2
…
HEAT
_F24
HEAT
_F25
Amendatory
capacity
demand.
0
1
2
…
24
25
6.4.2 Defrosting control
Condition of defrosting:
Condition of defrosting:
If any one of the following items is satisfied, AC
will enter the defrosting mode.
After the compressor starts up and keeps running,
mark the minimum value of T3 from the 10th
minutes to 15th minutes as T30.
1)If the compressor cumulate running time is up
to 29 minutes and T3< TCDI1, T3＋
T30SUBT3ONE≦T30.
2)If the compressor cumulate running time is up
to 35 minutes and T3< TCDI2, T3＋
T30SUBT3TWO≦T30.
3)If the compressor cumulate running time is up to
40 minutes and T3< -11ºF (-24C) for 3 minutes.
4)If the compressor cumulate running time is up to
120 minutes and T3<-5ºF (-15ºC).
Condition of ending defrosting:
If any one of the following items is satisfied, the
defrosting will finish and the machine will turn to
normal heating mode.
----T3 rises to be higher than TCDE 34ºF(1ºC).
----T3 keeps to be higher than TCDE 36ºF (2ºC)
for 80 seconds.
----The machine has run for 10 minutes in
defrosting mode.
Defrosting action：
off
on
Cool-F9
10S
30S
TimeA
10S
4-way valve
defrosting
Defrosting over
compressor
Indoor fan
Outdoor fan
EXV open
frequency
Max 10 minutes
frequency
Compressor stops
off
Anti-cold control
off
480P
480P for 240s
Condition of ending defrosting:
If any one of following items is satisfied,
defrosting will stop and the machine will turn to
normal heating mode.
· T3 > TempQuitDefrost_ADD ºF;.
· The defrosting time achieves
10min.
· 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: