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Symbol
(function)
Part code Application Specification Check method
Name
Solenoid
valve
Electronic
expansion
valve
Liquid
level
detection
heater
Electronic
expansion
valve
Thermistor
SV1
(discharge -
suction by-
pass)
SV2
(discharge -
suction by-
pass)
SLEV
LEV1
(SC coil)
CH2, CH3
(accumulator
liquid level
detection)
LEV
TH21
(inlet air
temperature)
TH22
(piping
temperature)
TH23
(gas side
piping
temperature)
1) High/low press. bypass at starting/
stopping and capacity control at
low load
2) Discharge press. rise suppression
Capacity control and high press. rise
suppression (backup for frequency
control)
Adjustment of liquid refrigerant (oil)
return foam accumulator
Adjustment of bypass flow rate from
outdoor unit liquid line at cooling
Heating of refrigerant in accumulator
liquid level detection circuit
1) Adjust superheat of outdoor unit
heat exchanger outlet at cooling.
2) Adjust subcool of indoor unit heat
exchanger at heating.
Indoor unit control (thermostat)
1) Indoor unit control (freeze
prevention, hot adjust, etc.)
2) LEV control in heating operation
(Subcool detection)
LEV control in cooling operation
(Superheat detector)
Indoor unit
AC 220V
Open at energizing and
close at deenergizing
AC 220V
Open at energizing and
close at deenergizing
DC12V stepping motor
drive Valve opening 0~480
pulse
Cord heater :2.8kΩ
(1.4kΩ+1.4kΩ)
AC220V
20W (10W + 10W)
DC12V
Opening of stepping motor
driving valve
60~2,000 pulses
R
0 = 15kΩ
B
0/100 = 3460
Continuity check by
tester
Resistance value
check
Continuity check
with tester for white-
red-orange
yellow-brown-blue
Resistance value
check
Outdoor unit
: 15kΩ
10˚C (50˚F) : 9.7kΩ
20˚C (68˚F) : 6.4kΩ
25˚C (77˚F) : 5.3kΩ
30˚C (86˚F) : 4.3kΩ
40˚C (104˚F) : 3.1kΩ
Rt =
15exp{3460( – )}
1 1
273+t 273
0˚C (32˚F)
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37
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