25
MICROPROCESSOR CONTROL
9
9-1. “I FEEL CONTROL” ( ) OPERATION
9-1-1. COOL mode of “I FEEL CONTROL”
2. Discharge temperature protection <MUH-A30WV>
The compressor is controlled by the temperature of discharge temperature thermistor RT62 for excess rise protection of
compressor discharge pressure.
• Compressor
When the temperature of discharge temperature thermistor RT62 goes to 120: or more, the compressor is turned OFF.
After 3 minutes since the compressor has been turned OFF, if the temperature of discharge temperature thermistor RT62
becomes 100: or less, the compressor is turned ON.
9-1-2. DRY mode of “I FEEL CONTROL”
1. Outdoor fan speed control <MUH-A30WV>
Outdoor fan speed control is as same as one of COOL mode of “I FEEL CONTROL”.
9-1-3. HEAT mode of “I FEEL CONTROL”
1. Outdoor fan speed control <MUH-A30WV>
Outdoor fan speed is controlled according to the temperature of ambient temperature thermistor RT63.
Outdoor fan Low operation : When the outside temperature decreases to 20°C or less.
Until the outside temperature goes to 22°C.
Outdoor fan High operation : Until the outside temperature decreases to 20°C or less.
When the outside temperature goes to 22°C.
Outdoor fan speed
20: 22:
High
Ambient temperature
thermistor RT63 temperature
Low
NOTE1. : If the temperature of RT63 reads from 20: to 22: at the air conditioner starting outdoor fan speed is High.
NOTE2. : When indoor fan speed is Low except HEAT operation mode and the outside temperature is 30: or less, the
outdoor fan operates at Low.
Outdoor fan Low operation is cancelled according to the following conditions(1 or 2):
1 When the operation is not changed and the outside temperature goes to 33: or more.
2 When the operation is changed. (Change to HEAT operation mode / Change of the indoor fan speed)
1. Outdoor fan speed control <MUH-A30WV>
Outdoor fan speed is controlled according to the temperature of ambient temperature thermistor RT63.
Outdoor fan Low operation : Until the outside temperature decreases to 13°C.
When the outside temperature goes to 18°C or more.
Outdoor fan High operation :When the outside temperature decreases to 13°C or less.
Until the outside temperature goes to 18°C.
High pressure protection
Released
48: 52:
ON
Outdoor fan
OFF
55:
(MUH-A18WV)
(MUH-A24WV) 58:
2. High pressure protection
<MUH-A18/A24WV>
During heating operation, the outdoor fan motor is controlled by the temperature of indoor coil thermistor RT12 for excess
rise protection of compressor discharge pressure.
(MUH-A18WV)Outdoor fan OFF : 52°C
Outdoor fan ON : 48°C
(MUH-A24WV)Outdoor fan OFF : 58°C
Outdoor fan ON : 55°C
High pressure protection chart
Example
Indoor coil thermistor
RT12 temperature
(MUH-A18WV) 52˚C
(MUH-A24WV) 58˚C
(MUH-A18WV) 48˚C
(MUH-A24WV) 55˚C
Outdoor fan motor
Outdoor fan motor
turn OFF
Outdoor fan motor
turn ON
ON
ON
OFF
OFF
Outdoor fan speed
13: 18:
High
Ambient temperature
thermistor RT63 temperature
Low
MUH-A18WV - MUH-A24WV - MUH-A30WV -
E1E1E1
OB322-1.qxp 03.11.13 4:06 PM Page 25
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