Midea MSC-09HRDN1-QD0(E), Руководство по обслуживанию

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9.7.7 Outdoor unit current control in heating mode.
1) The frequency descending is based on current grade, and judges if descending
again or resuming every 2 minutes.
2) If the current descends and stays at frequency remaining zone for 3 minutes, the
frequency will rise a grade. After 3 minutes if stays at this zone still, the frequency will rise a grade again.
9.7.8 Indoor heat exchanger high temperature protection.
1) If T2
＞
TEH2
℃
, compressor frequency will be descended one grade every 20 seconds. When it drops to F2, if
T2 is still higher than TEH2
℃
and remains 3 minutes, the compressor will stop.
2) If T2 descends to be lower than 48
℃
, or remains between 48
℃
to TEH2
℃
for 6 minutes, frequency limit will
be released.
3) If T2
＞
60
℃
, the compressor will stop and not resume until T2
＜
48
℃
.
9.7.9 Defrosting mode.
1) Condition of defrosting.
Condition 1. If T4
＞
0
℃
,
When the units are running, if the following two items are satisfied the units start defrosting:
a) The units runs with T3
＜
3
℃
for 40 minutes and T3 keeps lower than TCDI
℃
for more than 3 minutes.
b) The units runs with T3
＜
3
℃
for 80 minutes and T3 keeps lower than ( TCDI +2)
℃
for more than 3
minutes.
Remark: The above means that when T3 is lower than 3 ℃ PCB begins to time, if T3 is lower than start
temperature for 3 minutes, the machine starts defrosting. Here start temperature are TCDI ℃ and
( TCDI +2) ℃ .
Condition 2. If T4 ＜ 0 ℃ ,
The program judges according to the condition 1, if the two items are satisfied, then judges if T2 has descended
for more than 5 ℃ , if it has the machine starts defrosting, or continues to judge T2 and will not defrost until T2
I3HEAT
I2HEAT
I1HEAT
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
out
door unit
curr
ent
Remark: Δ Tcon can be changed among 0, -2,- 4 , the default is 0
℃ ℃
A
Δ
Th=(ro
om temp
) – (s
etti
ng
Te
m
p
) –
Δ
Tc
on
5.0
4.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
H
G
F
E
D
C
B
℃