Mitsubishi Electric Mr. Slim MUZ-GE15NA-1, Service Manual

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MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA
MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2
MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH
MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2
MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA
MUY-GE24NA
MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2
8-2. R.V. COIL CONTROL (MUZ)
Heating . . . . . . . . . . . . . . . . . ON
Cooling . . . . . . . . . . . . . . . . . OFF
Dry . . . . . . . . . . . . . . . . . . . . OFF
NOTE
: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
ON
OFF
ON
OFF
Outdoor fan
motor
Compressor
5 seconds 15 seconds
8-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
ON
OFF
Compressor
Outdoor fan
motor
R.V.coil
ON
OFF
ON
OFF
<COOL>
5 seconds
<HEAT>
5 seconds
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor Purpose
Actuator
Compressor LEV
Outdoor fan
motor
R.V.coil
(MUZ)
Indoor fan
motor
Discharge temperature
thermistor
Protection
○ ○
Indoor coil temperature
thermistor
Cooling: Coil frost prevention
○
Heating: High pressure protec-
tion
○ ○
Defrost thermistor
(MUZ)
Heating: Defrosting
○ ○ ○ ○ ○
Fin temperature thermistor Protection
○ ○
Ambient temperature
thermistor Cooling: Low ambient tempera-
ture operation
○ ○ ○
Outdoor heat exchanger tem-
perature thermistor
Cooling: Low ambient tempera-
ture operation
○ ○ ○
Cooling: High pressure protec-
tion
○ ○ ○
8
ACTUATOR CONTROL
OBH549F