Mitsubishi Electric Mr.Slim MUZ-A17NA, Service Manual

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37
ON
OFF
ON
OFF
Outdoor fan
motor
Compressor
5 seconds 15 seconds
MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA
MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
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
Compressor
Outdoor fan
motor
R.V.coil
<MUZ-A09/12/15/17>
ON
OFF
ON
OFF
<COOL>
5 seconds
<HEAT>
5 seconds
ON or OFF
ON or OFF
R.V.coil
<MUZ-A24,MUZ-GA24>
ON
OFF
ON or OFF ON or OFF
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.
<MUZ-A09/12/15/17, MUY-A15/17>
Sensor Purpose
Actuator
Compressor LEV Outdoor fan
motor
R.V. coil
Indoor fan
motor
Discharge temperature thermistor Protection
○ ○
Indoor coil temperature thermistor
Cooling: Coil frost prevention
○
Heating: High pressure protection
○ ○
Defrost thermistor
Cooling: High pressure protection
○ ○
Heating: Defrosting
○ ○ ○ ○ ○
Fin temperature thermistor Protection
○ ○
Ambient temperature thermistor Cooling: Low ambient temperature operation
○ ○ ○
<MUZ-A24, MUY-A24, MUZ-GA24, MUY-GA24>
Sensor Purpose
Actuator
Compressor LEV Outdoor fan
motor
R.V. coil
Indoor fan
motor
Discharge temperature thermistor Protection
○ ○
Indoor coil temperature thermistor
Cooling: Coil frost prevention
○
Heating: High pressure protection
○ ○
Defrost thermistor ( MUZ ) Defrosting
○ ○ ○ ○ ○
Fin temperature thermistor Protection
○ ○
Outdoor heat exchanger temperature High pressure protection
○ ○ ○
Ambient temperature thermistor
Cooling: Low ambient temperature
operation
○ ○ ○
8
ACTUATOR CONTROL