Mitsubishi MUY-A15NA, Service Manual

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8
ACTUATOR CONTROL
MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA
MUY-A15NA MUY-A17NA MUY-A24NA
Discharge temperature thermistor
Indoor coil temperature thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature thermistor
Purpose
Protection
Cooling : Coil frost prevention
Heating : High pressure protection
Cooling : High pressure protection
Heating : Defrosting
Protection
Cooling : Low ambient temperature operation
Compressor LEV
Outdoor
fan motor
Indoor
fan motor
R.V. coil
Sensor
Actuator
8-3. Relation between main sensor and actuator
<MUZ-A09/12/15/17>
<MUZ-A24>
8-2. R.V. coil control
<MUZ-A09/12/15/17/24>
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
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>
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.
Discharge temperature thermistor
Indoor coil temperature thermistor
Defrost thermistor
Fin temperature thermistor
Outdoor heat exchanger temperature
Ambient temperature thermistor
Purpose
Protection
Cooling : Coil frost prevention
Heating : High pressure protection
Defrosting
Protection
High pressure protection
Cooling : Low ambient temperature operation
Compressor LEV
R.V. coil
Outdoor
fan motor
Indoor
fan motor
Actuator
Sensor
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