Mitsubishi Electric MUZ-GB50VA, Руководство по обслуживанию

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9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
MUZ-GB50VA
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 Heating : Defrosting
○ ○ ○ ○ ○
Fin temperature thermistor Protection
○ ○
Ambient temperature thermistor
Cooling : Low ambient temperature
operation
○ ○ ○
Outdoor heat exchanger tempera-
ture thermistor
Cooling : Low ambient temperature
operation
○ ○ ○
Cooling : High pressure protection
○ ○ ○
SERVICE FUNCTIONS
10
10-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board.
(Refer to 11-6-4.)
Jumper wire Defrost fi nish temperature ( °C )
JS
Soldered
(Initial setting)
9
None
(Cut)
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10-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature.
The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 20°C or
below. When pre-heat control is turned ON, compressor is energized. (About 50 W)
<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 11-6.4)
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
MUZ-GB50VA-
E3