Mitsubishi Electric PURY-P200 Service Handbook page 86

Symbol
Name
(function)
Solenoid SV1
valve Discharge-
suction bypass
SV2
Discharge-
suction bypass
SV3
P450-P650
Discharge-
types only
suction bypass
SV4a~4d
Heat exchanger
capacity control
SV5a, 5b P400-P650
Heat exchanger types only
capacity control
Heater CH11, 12
CH12 on
Crankcase
P450-P650
heater
types only
4-way
21S4a
valve
21S4b
2. Indoor Unit
Symbol
Name
(function)
Linear LEV
expansion
valve
Thermistor
TH1 (Suction air
temperature)
TH2 (Piping
temperature)
TH3 (Gas-side
piping
temperature)
TH4 (Outdoor air
temperature)
Temperature
sensor (Indoor
air temperature)
Notes Function
1 High/low pressure bypass at
starting and stopping, and capacity
control during low-load operation
2 High-pressure rise suppression
Low-pressure down suppression
Provides compressor protection
when Compressor No. 2 is at a stop
Controls outdoor unit heat exchanger
capacity.
Heats refrigerants in the compressor.
Switches between cooling and heat-
ing cycles.
Switches between cooling and heat-
ing cycles.
Notes Function
1 Adjusts superheat at the indoor
heat exchanger outlet during
cooling
2 Adjusts subcool at the indoor heat
exchanger outlet during cooling
Indoor unit control (Thermo)
1 Indoor unit control (Anti-
freeze/heat adjustment)
2 LEV control during heating
operation (subcool detection)
LEV control during cooling operation
(superheat detection)
Indoor unit control (Thermo)
Indoor unit control (Thermo)
- 83 -
Specification
AC220~240V
Open when energized
Closed when not energized
AC220~240V
Closed when energized
Open when not energized
Cord heater AC220~240V
CH11,CH12·····1280Ω 45W
AC220~240V
De-energized : cooling cycle
Energized : heating cycle
Specification
DC12V
Opening of stepping motor
driving valve 0-(1400) pulses
R =15kΩ
0
R =3460
0/80
Rt =
1 1
15exp{3460( - )}
273+t 273
0˚C : 15kΩ 30˚C : 4.3kΩ
10˚C : 9.7kΩ 40˚C : 3.1kΩ
20˚C : 6.4kΩ
25˚C : 5.3kΩ
Check method
Continuity check
with a tester
Resistance value
check
Continuity check
with a tester
Check method
Refer to the section
on continuity test
with a tester
Continuity between
white-red-orange
Continuity between
yellow-brown-blue
White
M
Red
Orange Yellow Brown Blue
Resistance value
check