Mitsubishi Electric PURY-80TMU Service Handbook page 46

Symbol
Name
(function)
Thermistor THHS 1) Detects the inverter cooling fin temperature.
2) Provides inverter overheating protection.
3) Controls the control box cooling fan.
Solenoid SV1 1) High/low press. bypass at starting/stopping and
valve (discharge -
suction 2) Discharge press. rise suppression
bypass)
SV2
Capacity control and high press. rise suppression
(discharge -
(backup for frequency control)
suction
bypass)
SV3 ~ 6 Control of heat exchanger capacity.
Linear Adjustment of liquid refrigerant (oil) return foam
SLEV
expansion accumulator
valve
Linear 1) Adjust superheat of outdoor unit heat exchanger
LEV
expansion
valve 2) Adjust subcool of indoor unit heat exchanger at
Thermistor Indoor unit control (thermostat)
TH21
(inlet air
temperature)
1) Indoor unit control (freeze prevention, hot adjust,
TH22
(piping
2) LEV control in heating operation (Subcool detec-
temperature)
LEV control in cooling operation
TH23
(Superheat detector)
(gas side
piping
temperature)
Application
capacity control at low load
outlet at cooling.
heating.
etc.)
tion)
R =17kΩ
50
B =4170
25/50
Rt =
17exp{4170(
-20˚C (-4˚F)
-10˚C (14˚F) : 323.3kΩ
0˚C (32˚F)
10˚C (50˚F)
20˚C (68˚F)
30˚C (86˚F)
40˚C (104˚F) : 25.7kΩ
50˚C (122˚F) : 17.0kΩ
60˚C (140˚F) : 11.5kΩ
70˚C (158˚F) : 8.0kΩ
80˚C (176˚F) : 5.7kΩ
90˚C (194˚F) : 4.1kΩ
100˚C (212˚F) : 3.0kΩ
AC 208~230V
Open at energizing and
close at deenergizing
DC12V stepping motor drive
Valve opening 0~480 pulse
DC12V
Opening of stepping motor
driving valve
41~2,000 pulses
R = 15kΩ
0
B = 3460
0/100
Rt =
15exp {3460 (
0˚C (32˚F)
10˚C (50˚F)
20˚C (68˚F)
25˚C (77˚F)
30˚C (86˚F)
40˚C (104˚F) : 3.1kΩ
–45–
Specification Check method
1
1
- )}
273+50
273+t
: 605.0kΩ
: 180.9kΩ
: 105.4kΩ
: 63.8kΩ
: 39.9kΩ
• Continuity check
by tester
• Temperature of
inlet and outlet.
Continuity check
with tester for
white-red-orange
yellow-brown-blue
Resistance value
check
1 1
- )}
273+t
273+0
: 15kΩ
: 9.7kΩ
: 6.4kΩ
: 5.3kΩ
: 4.3kΩ