26
NOTE : During high pressure protection and for 4 minutes and 15 seconds after high pressure protection, defrosting of
outdoor heat exchanger is not detected by the defrost thermistor RT61.
NOTE : During the high pressure protection and for 10 seconds after high pressure protection, defrosting of outdoor heat
exchanger is not detected by the defrost thermistor RT61.
<MUH-A30WV>
During heating operation, the outdoor fan and the compressor are controlled by the temperature of indoor coil thermistor
RT12 for excess rise protection of compressor discharge pressure.
• Outdoor fan
When the temperature of indoor coil thermistor RT12 goes to 55
:
or more, the outdoor fan is turned OFF.
When the temperature of indoor coil thermistor RT12 becomes to 52
:
or less, the outdoor fan is turned ON.
• Compressor
When the temperature of indoor coil thermistor RT12 goes to 75
:
or more, the compressor is turned OFF.
3 minutes after the compressor is turned OFF and if the temperature of indoor coil thermistor RT12 becomes 75
:
or less,
the compressor is turned ON.
3. Discharge temperature protection <MUH-A30WV>
Discharge temperature protection is as same as during COOL mode of “I FEEL CONTROL”.
(3) Defrosting time chart
Defrost thermistor RT61
13
:
or more(MUH-A30WV)
3
:
or more(MUH-A18/A24WV)
-3
:
or less
Outdoor 52C
contactor(Compressor)
X62
(R.V. coil)
SR61
Outdoor fan
Defrost
counter
Indoor fan
Indoor vane
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Horizontal
Set position
Max 10 min.
30 sec.
15 sec.
30 sec.
5 sec.
NOTE
4. Defrosting
Defrosting of outdoor heat exchanger is controlled by deicer P.C. board, with detection by the defrost thermistor RT61.
(1) Starting conditions of defrost
When all conditions of a) ~ c) are satisfied, the defrosting operation starts.
a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting opera-
tion working.
b) The defrost thermistor RT61 reads -3°C or less.
c) After releasing the high pressure protection 4 minutes and 15 seconds(MUH-18/24WV)/ 10 seconds(MUH-30WV) have
elapsed.
(2) Releasing conditions of defrost
When the condition d) or e) is satisfied, the defrosting operation stops.
d) The defrost thermistor RT61 reads 3°C(MUH-18/24WV)/ 13°C(MUH-30WV) or more.
e) The defrosting time exceeds 10 minutes.
Very Low
NOTE: • When the indoor coil thermistor RT12 reads above 18°C, indoor fan operates at Very Low for 30 seconds.
• When the indoor coil thermistor RT12 reads 18°C or less, the indoor fan stops.
OB322-1.qxp 03.11.13 4:06 PM Page 26
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