Mitsubishi Electric PUHY-200YMF-B Service Handbook page 78

Symbol
Name
(function)
Thermistor TH10 1) Detects the compressor shell
(P-YMF-B
only) 2) Provides compressor shell
THHS 1) Detects the inverter cooling fin
2) Provides inverter overheating
3) Controls the control box cooling
Solenoid SV1 1) High/low press. bypass at starting/
valve (discharge -
suction
bypass) 2) Discharge press. rise suppression
SV2 Capacity control and high press. rise
(discharge - suppression (backup for frequency
suction control)
bypass)
SV3 ~ 6 Control of heat exchanger capacity.
Linear SLEV Adjustment of liquid refrigerant (oil)
expansion return foam accumulator
valve
LEV1 Adjustment bypass flow rate from
(SC coil) outdoor unit liquid line at cooling.
Liquid level CH2, CH3 Heating of refrigerant in accumulator
detection (accumulator liquid level detection circuit
heater liquid level
detection)
Linear LEV 1) Adjust superheat of outdoor unit
expansion
valve 2) Adjust subcool of indoor unit heat
Thermistor TH21 Indoor unit control (thermostat)
(inlet air
temperature)
TH22 1) Indoor unit control (freeze
(piping
temperature) 2) LEV control in heating operation
TH23 LEV control in cooling operation
(gas side (Superheat detector)
piping
temperature)
Application
temperature.
overheating protection.
temperature.
protection.
fan.
stopping and capacity control at
low load
heat exchanger outlet at cooling.
exchanger at heating.
prevention, hot adjust, etc.)
(Subcool detection)
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
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 0~480 pulse
Cord heater : 2kΩ
(1kΩ + 1kΩ)
AC220~240V
20W (10W + 10W)
DC12V
Opening of stepping motor
driving valve
60~2,000 pulses
R = 15kΩ
0
B = 3460
0/100
Rt =
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
–76–
Check method
• PUHY-
P200·250
YMF-B
• PURY-
P200·250
YMF-B
• PU(H)Y-
(P)200·250
YMF-B
1
)} • PURY-
(P)200·250
YMF-B
• Continuity check
by tester
• Temperature of
inlet and outlet.
• PURY-
(P)200·250YMF-B
• PU(H)Y-
(P)200·250YMF-B
• PURY-
(P)200·250YMF-B
• PU(H)Y-
(P)200·250YMF-B
Resistance value • PU(H)Y-
check (P)200·250YMF-B
• PURY-
(P)200·250YMF-B
Continuity check
with tester for
white-red-orange
yellow-brown-blue
Resistance value
check
1
)}
Object