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Resistance check
Resistance check
Conductivity check
using tester.
Belt heater AC 200 to 240 V
MC1 1280 Ω 45 W
MC2 400:1280 Ω 45 W
500:1029 Ω 56 W
Code heater 2880 Ω
(1440 Ω + 1440 Ω)
AC 220 to 240 V
20 W (10 W + 10 W)
AC 220 to 240 V
Not conducting: cooling cycle
Conducting : heating cycle
Refrigerant heating inside compressor.
Refrigerant heating of accumulator
liquid level detection circuit.
Switching of cooling/heating cycle.
CH11
CH12
crankcase
heater
CH2
CH3
Accumulator
liquid level
detection
Heater
4-way
valve
Name
Code
(Function)
Inspection methodApplicationProduct code Specification
Outdoor unit
Solenoid
vallve
Linear
expansion
valve
SV3~8 heat
exchanger
capacity
control
SV6a
discharge-
suction
bypass
SLEV (Oil re-
turn)
Controls heat exchanger capacity of
outdoor unit.
Evaporation of liquid refrigerant inside
MC2.
Adjusts the rate of refrigerant (oil) re-
turning from the accumulator.
AC 220 to 240 V
Close: conducting
Open: not conducting
AC 220 to 240 V
Open: conducting
Close: not conducting
DC 12 V stepping motor drive
valve opening amount 0 to
480 pulse (Direct drive type).
Same as indoor unit
LEV. However, the
resistance value is
different than the in-
door unit.
Conductivity test
using tester.
21S4a
21S4b