- 70 -
[
VI
Refrigerant Circuit ]
Linear ex-
pansion
valve
(LEV)
LEV
(SC coil)
Adjusts the amount of bypass
flow from the liquid pipe on the
outdoor unit during cooling
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
(direct driven type)
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.")
Heater
CH11
CH12
Crankcase
heater
CH12 is
available
only on
P500
model
Heats the refrigerant in the com-
pressor
Cord heater
AC220~240V
CH11, CH12:
1280ohm 45W
Resis-
tance
check
4-way
valve
21S4a
Changeover between heating
and cooling
AC220~240V
Dead: cooling cycle
Live: heating cycle
Continuity
check with
a tester
21S4b
1. Changeover between heating
and cooling
2. Controls outdoor unit heat ex-
changer capacity
AC220~240V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 50%
or heating cycle
21S4c P500
model
only
Part
name
Symbols
(functions)
Notes
Usage
Specifications
Check
method
Содержание PU(H)Y-P250YGM-A
Страница 1: ...Models Service Handbook AIR CONDITIONERS PU H Y P250YGM A PUHY P500YGM A PFD P250VM E PFD P500VM E ...
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Страница 72: ... 63 VI Refrigerant Circuit 1 Refrigerant Circuit Diagram 65 2 Principal Parts and Functions 68 ...
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Страница 182: ... 173 X LED Monitor Display on the Outdoor Unit Board 1 How to Read the LED on the Service Monitor 175 ...
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