Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook page 63

Name Symbol (function)
Thermistor TH10
THHS
Solenoid SV1
valve (discharge -
suction bypass)
SV2
(discharge -
suction bypass)
SV3 ~ 6
SV71~73
Linear SLEV
expansion
valve
LEV2
Linear LEV
expansion
valve
Thermistor TH21
(inlet air tempera-
ture)
TH22
(piping tempera-
ture)
TH23
(gas side piping
temperature)
Application
1) Detects the compressor shell
temperature.
2) Provides compressor shell overheat-
ing protection.
1) Detects the inverter cooling fin
temperature.
2) Provides inverter overheating
protection.
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)
Control of heat exchanger capacity.
Adjustment of liquid refrigerant (oil)
return foam accumulator
Controls the volume of refrigerant flowing
to the inverter cooler's heat exchanger.
1) Adjust superheat of heat source 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)
–62–
Specification
R =7.465kΩ
120
B =4057
25/120
Rt =
7.465exp
1 1
{4057( - )}
273+t 273+120
20˚C : 250kΩ 70˚C : 34kΩ
30˚C : 160kΩ 80˚C : 24kΩ
40˚C : 104kΩ 90˚C : 17.5kΩ
50˚C : 70kΩ 100˚C : 13.0kΩ
60˚C : 48kΩ 110˚C : 9.8kΩ
R =17kΩ
50
B =4170
25/50
Rt =
1
1
17exp{4170( - )}
273+50
273+t
-20˚C : 605.0kΩ 50˚C : 17.0kΩ
-10˚C : 323.3kΩ 60˚C : 11.5kΩ
0˚C : 180.9kΩ 70˚C : 8.0kΩ
10˚C : 105.4kΩ 80˚C : 5.7kΩ
20˚C : 63.8kΩ 90˚C : 4.1kΩ
30˚C : 39.9kΩ 100˚C : 3.0kΩ
40˚C : 25.7kΩ
AC 220~240V
Open at energizing and
close at deenergizing
DC12V stepping motor drive
Valve opening 0~450 pulse
(SLEV), 0~150 pulse (LEV2)
DC12V
Opening of stepping motor
driving valve
60~2,000 pulses
R = 15kΩ
0
B = 3460
0/100
Rt =
1 1
15exp {3460 ( - )}
273+t 273+0
0°C : 15kΩ
10°C : 9.7kΩ
20°C : 6.4kΩ
25°C : 5.3kΩ
30°C : 4.3kΩ
40°C : 3.1kΩ
Check method
• Continuity check by
tester
• Temperature of inlet
and outlet.
Continuity check with
tester for white-red-
orange
yellow-brown-blue
Resistance value
check