Mitsubishi Electric PURY-100TMU, Service Handbook

Page: 46 / 121

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Name Application Specification Check method
Outdoor unit
Symbol
(function)
Thermistor
Solenoid
valve
Linear
expansion
valve
Linear
expansion
valve
Thermistor
THHS
SV1
(discharge -
suction
bypass)
SV2
(discharge -
suction
bypass)
SV3 ~ 6
SLEV
LEV
TH21
(inlet air
temperature)
TH22
(piping
temperature)
TH23
(gas side
piping
temperature)
1) Detects the inverter cooling fin temperature.
2) Provides inverter overheating protection.
3) Controls the control box cooling fan.
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
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 detec-
tion)
LEV control in cooling operation
(Superheat detector)
R
50
=17k
Ω
B
25/50
=4170
Rt =
17exp{4170( - )}
-20˚C (-4˚F) : 605.0k
Ω
-10˚C (14˚F) : 323.3k
Ω
0˚C (32˚F) : 180.9k
Ω
10˚C (50˚F) : 105.4k
Ω
20˚C (68˚F) : 63.8k
Ω
30˚C (86˚F) : 39.9k
Ω
40˚C (104˚F) : 25.7k
Ω
50˚C (122˚F) : 17.0k
Ω
60˚C (140˚F) : 11.5k
Ω
70˚C (158˚F) : 8.0k
Ω
80˚C (176˚F) : 5.7k
Ω
90˚C (194˚F) : 4.1k
Ω
100˚C (212˚F) : 3.0k
Ω
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
0
= 15k
Ω
B
0/100
= 3460
Rt =
15exp {3460 ( - )}
0˚C (32˚F) : 15k
Ω
10˚C (50˚F) : 9.7k
Ω
20˚C (68˚F) : 6.4k
Ω
25˚C (77˚F) : 5.3k
Ω
30˚C (86˚F) : 4.3k
Ω
40˚C (104˚F) : 3.1k
Ω
• Continuity check
by tester
• Temperature of
inlet and outlet.
Continuity check
with tester for
white-red-orange
yellow-brown-blue
Resistance value
check
Indoor unit
1
273+50
1
273+t
1
273+t
1
273+0