Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 137

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Linear ex- LEV
pansion (SC coil)
valve
(LEV)
Heater CH11
CH12
Crankcase
heater
4-way 21S4a
valve
21S4b
Notes Usage
Adjusts the amount of bypass
flow from the liquid pipe on the
outdoor unit during cooling
TH12 is Heats the refrigerant in the com-
available pressor
only on
P168-
P234
models
Changeover between heating
and cooling
P126- 1. Changeover between heating
P234 and cooling
models 2. Controls outdoor unit heat ex-
only changer capacity
- 128 -
Specifications
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
(direct driven type)
Cord heater
AC208/230V
CH11, CH12:
928ohm 57W (230V)
AC208/230V
Dead: cooling cycle
Live: heating cycle
AC208/230V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 50%
or heating cycle
Check
method
Same as
indoor LEV
The resis-
tance val-
ue differs
from that
of the in-
door LEV.
(Refer to
the section
"LEV Trou-
bleshoot-
ing.")
Resis-
tance
check
Continuity
check with
a tester