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38MGRBQ: Service Manual
Heating Mode
T1 Ts
4
3
2
1
0
Fig. 28 — Heating Mode
Table 20 — Heating Mode
Capacity Area
a
b
Norm code (N)
3
2
Table 21 — Heating Mode
Model
9K
HP
1.0
NOTE: The final result is an integer.
Modify the result according to a T2 average (correction).
NOTE: Average value of T2; sum of T2 value of all indoor units)/
(indoor units number).
°C T2 average
47
40
Fig. 29 — T2 Average
Use Table 22 and the final capacity request to confirm the operating
frequency.
Table 22 — T2 Average
Frequency
0
HEAT_F1
(Hz)
Amendatory
Capacity
0
1
Demand
The maximum running frequency is adjusted according to the outdoor
ambient temperature.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
f
3
e
2
d
1
c
0
b
1
a
c
d
e
1.5
1
0.5
12K
18K
24K
1.2
1.5
2.5
Decrease frequency
Keep frequency
Increase frequency
...
HEAT_F2
HEAT_F24
HEAT_F25
...
...
2
24
...
f
0
Defrosting Control
Defrosting Conditions
After the compressor starts and enters a normal operation, mark the
minimum value of T3 from the 10th to the 15th minute as T30.
If any one of the following conditions is satisfied, the unit enters the
Defrosting mode:
1. If the compressor's cumulative running time reaches 29 minutes and
T3<TCDI1 and T3+T30SUBT3ONE ≦T30.
2. If the compressor cumulative running time reaches 35 minutes and
T3< TCDI2 and T3+ T30SUBT3TWO≦T30.
3. If the compressor cumulative running time reaches 40 minutes and
T3<
24°C for 3 minutes.
4. If the compressor cumulative running time reaches 120 minutes and
T3<
15°C.
Defrost Stop Conditions
If any of the following conditions is satisfied, defrosting ends and the unit
returns to the normal heating mode:
....T3 rises above than TCDE1°C
....T3 remains at TCDE2°C or above for 80 seconds
....Unit runs for ten consecutive minutes in DEFROSTING mode
Defrosting Actions
25
compressor
frequency
Indoor fan
Outdoor fan
EXV open
Fig. 31 — Defrosting Action
22
Fig. 30 — T2 Average
o
Max 10 minutes
Cool-F9
Compressor stops
TimeA
10S
10S 30S
o
o
8 4
P 0
4
0 8
o
n
frequency
f P
r o
4 2
s 0
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