Actuator Control; Outdoor Fan Motor Control; R.v. Coil Control; Relation Between Main Sensor And Actuator - Mitsubishi Electric MUZ-GE09NA Service Manual

8

ACTUATOR CONTROL

MUZ-GE09NA MUZ-GE12NA
MUZ-GE09NA2 MUZ-GE12NA2
MUZ-GE09NAH MUZ-GE12NAH
MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2
MUY-GE09NA MUY-GE12NA
MUY-GE09NA2 MUY-GE12NA2

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.
Compressor
Outdoor fan
motor
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.
Compressor
R.V.coil
Outdoor fan
motor

8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor (MUZ)
Fin temperature thermistor
Ambient temperature
thermistor
Outdoor heat exchanger tem-
perature thermistor
OBH549F
MUZ-GE15NA
MUZ-GE15NA2
MUZ-GE15NAH
MUY-GE15NA
MUY-GE15NA2
5 seconds
ON
OFF
ON
OFF
<COOL>
5 seconds
ON
OFF
ON
OFF
ON
OFF
Purpose
Protection
Cooling: Coil frost prevention
Heating: High pressure protec-
tion
Heating: Defrosting
Protection
Cooling: Low ambient tempera-
ture operation
Cooling: Low ambient tempera-
ture operation
Cooling: High pressure protec-
tion
MUZ-GE18NA
MUZ-GE18NAH
MUY-GE18NA
15 seconds
<HEAT>
5 seconds
Actuator
Outdoor fan
Compressor LEV
motor
○ ○
○
○ ○
○ ○ ○
○ ○
○ ○ ○
○ ○ ○
○ ○ ○
42
MUZ-GE24NA
MUY-GE24NA
R.V.coil
Indoor fan
motor
(MUZ)
○ ○