Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 140

Symbols
Part
(func- Notes
name
tions)
Solenoid SV1
valve Dis-
charge-
suction
bypass
SV2
Dis-
charge-
suction
bypass
SV3 P168-P234
Dis- models only
charge-
suction
bypass
SV4a-
SV4d
Heat ex-
changer
capacity
control
SV5a- P168-P234
SV5b models only
Heat ex-
changer
capacity
control
Heater CH11 TH12 is
CH12 available
Crank- only on
case P168-P234
heater models
4-way 21S4a
valve
21S4b P126-P234
models only
Usage
1. High/low pressure bypass at
start-up and stopping, and ca-
pacity control during low-load
operation
2. High-pressure-rise prevention
Prevents low pressure drop
Provides compressor protection
while compressor No. 2 is
stopped.
Controls outdoor unit heat ex-
changer capacity
Heats the refrigerant in the com-
pressor
Changeover between heating
and cooling
Changeover between heating
and cooling
- 131 -
[ VI Refrigerant Circuit ]
Specifications
AC208/230V
Open while being powered/
closed while not being powered
AC208/230V
Closed while being powered/
open while not being powered
Cord heater
AC208/230V
CH11, CH12:
928ohm 57W (230V)
AC208/230V
Dead: cooling cycle
Live: heating cycle
AC208/230V
Dead: cooling cycle
Live: heating cycle
Check
method
Continuity
check with
a tester
Resis-
tance
check
Continuity
check with
a tester