Service Manual -
B-VMHxxAV-1
Product Features
5
different.
3.4.4 Defrosting mode
• The unit enters defrosting mode according to the
temperature value of T3 and T4 as well as the
compressor running time.
• In defrosting mode, the compressor continues to run,
the indoor and outdoor motor will cease operation,
the defrost light of the indoor unit will turn on, and
the “
” symbol is displayed.
• If any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
• T3 rises above TCDE1.
• T3 maintained above TCDE2 for 80 seconds.
• Unit runs for 15 minutes consecutively in defrosting
mode.
• If T4 is lower than or equal to -22°C and compressor
running time is more than TIMING_DEFROST_TIME,
if any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
• Unit runs for 10 minutes consecutively in defrosting
mode.
• T3 rises above 10°C.
For some models:
• If any one of the following conditions is satisfied, the
unit enters defrosting mode
• If T3 or T4 is lower than -3°C for 30 seconds,Ts-T1
is lower than 5°C and compressor running time is
more than EE_TIME_DEFROST7.
• If T3 or T4 is lower than -3°C for 30 seconds and
compressor running time is more than EE_TIME_
D30.
• If any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
• T3 rises above TCDE1+4
°C
.
• T3 maintained above TCDE2+4°C for 80 seconds.
• Unit runs for 15 minutes consecutively in defrosting
mode.
3.4.5 Evaporator Coil Temperature Protection
When the evaporator temperature exceeds a preset
protection value, the compressor ceases operation.
3.5 Auto Mode
• This mode can be selected with the remote controller
and the temperature setting can be adjusted between
16°C~30°C.
• In auto mode, the machine selects cooling, heating, or
fan-only mode on the basis of
∆
T (
∆
T =T1-TS).
∆T
Running mode
∆T>2
°C(
3.6
°F)
Cooling
-3
℃
(
-5.4
°F)
<∆T≤2
°C(
3.6
°F) Fan-only
∆T≤-3
°C(
-5.4
°F)
Heating*
Heating*: In auto mode, cooling only models run the fan
• Indoor fan will run at auto fan speed.
• The louver operates same as in relevant mode.
• If the machine switches mode between heating and
cooling, the compressor will keep stopping for certain
time and then choose mode according to
∆
T.
3.6 Drying Mode
• In drying mode, AC operates the same as auto fan in
cooling mode.
• All protections are activated and operate the same as
they do that in cooling mode.
• Low Room Temperature Protection
If the room temperature is lower than 10°C, the
compressor ceases operations and does not resume until
room temperature exceeds 12°C.
3.7 Forced Operation Function
Press the AUTO/COOL button, the AC will run as below
sequence:
Forced auto
→
Forced cooling
→
Off
• Forced cooling mode:
The compressor and outdoor fan continue to run and
the indoor fan runs at breeze speed. After running for 30
minutes, the AC will switch to auto mode with a preset
temperature of 24°C(76°F).
• Forced auto mode:
Forced auto mode operates the same as normal auto mode
with a preset temperature of 24°C(76°F).
• The unit exits forced operation when it receives the
following signals:
• Switch off
• Changes in:
• mode
• fan speed
• sleep mode
• Follow me
Summary of Contents for Comfort-Aire Century A-VMH18SV-1
Page 30: ...Service Manual B VMHxxAV 1 ...
Page 37: ...Service Manual B VMHxxAV 1 Outdoor Unit 3 3 Panel Plate X430 Square grille ...
Page 38: ...Service Manual B VMHxxAV 1 Outdoor Unit 4 4 Panel Plate D30 Square grille ...
Page 39: ...Service Manual B VMHxxAV 1 Outdoor Unit 5 5 2 Service Place Minimim 4 Recommended 12 ...
Page 42: ...Service Manual B VMHxxAV 1 Outdoor Unit 8 8 A VMH18SV 1 A VMH24SV 1 ...
Page 45: ...Service Manual B VMHxxAV 1 ...
Page 103: ...Service Manual B VMHxxAV 1 Troubleshooting 15 ...