28
2.5
2
High
Low
1
Medium
1.5
9.4.3.4 Defrosting mode
Condition of defrosting:
----T4
＞
0
℃
,
When the units are running, if the following two
items are satisfied, the units start defrosting:
The units run with T3
＜
3
℃
for 40 minutes and
T3 keeps lower than TCDI
℃
for more than 3
minutes.
The units run with T3
＜
3
℃
for 80 minutes and
T3 keeps lower than TCDI+2
℃
for more than 3
minutes.
----T4
＜
0
℃
,
If the 1
st
condition and 2
nd
condition items are
satisfied, then the program judges if T2 has
decreased more than 5
℃
.When T2 has
decreased more than 5
℃
, enter the defrosting
mode.
----No matter what value T4 is, if the machine
runs with T3
＜
3
℃
for more than 120 minutes
and T3 keeps lower than TCDI+4
℃
for more
than 3 minutes, the machine will enter
defrosting mode no matter if T2 drops more
than 5
℃
or not.
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 TCDE1
℃
.
----T3 keeps to be higher than TCDE2
℃
for 80
seconds.
----The machine has run for 10 minutes in
defrosting mode.
Defrosting action
：
For 9k,12k models:
Compressor
on
off
on
on
on
off
off
off
4-way valve
Outdoor fan
Indoor fan
Indoor fan breeze(10s)
xx
10s
no longer than 10m
30s
FrequencyF8
10s
Frequency F2
xx=60s.
For 18k,22k models:
Compressor
on
off
on
on
on
off
off
off
4-way valve
Outdoor fan
Indoor fan
Indoor fan breeze(10s)
xx
no longer than 10m
Frequency F8
30s
10s
10s
Frequency F2
XX=60 for 18k model, XX=90 for 22k model.
9.4.3.5 Evaporator coil temperature
protection
----T2> TEH2
℃
, the compressor running
frequency decreases to the lower level and
runs for 20s.
When the frequency decreases to F2 and the
T2 is still over TEH2
℃
for 3 minutes, the
Summary of Contents for MCHS-09NIH1
Page 11: ...9 6 Wiring Diagram 6 1 Indoor Unit MEHS 09NiH1 MEHS 12NiH1 MEHS 09NiH2 MEHS 12NiH2 MEHS 18NiH2...
Page 12: ...10 MEHS 22NiH2...
Page 13: ...11 6 2 Outdoor Unit MCHS 09NiH1 MCHS 12NiH1...
Page 14: ...12 MCHS 09NiH2 MCHS 12NiH2...
Page 15: ...13 MCHS 18NiH2 MCHS 22NiH2...
Page 16: ...14 For MCHS 12NiH2 For MCHS 09NiH1 MCHS 12NiH1...
Page 17: ...15 For MCHS 09NiH2 For MCHS 18NiH2...
Page 18: ...16 For MCHS 22NiH2...
Page 50: ...48 P W P N...
