Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 137

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Heater CH11
4-way 21S4a
valve
Elec- LEV1
tronic (for SC control)
expan-
sion
valve
LEV2a
LEV2b
(Refrigerant
flow control
HWE09080
Notes Usage
Heats the refrigerant in the com-
pressor
Changeover between heating and
cooling
PQHY Regulates the amount of bypass
only flow from the heat source unit liq-
uid pipe during cooling
PQHY Controls the refrigerant flow dur-
only ing heating
- 128 -
Specifications
Cord heater
1035 ohm 51W
AC208-230V
Dead: cooling cycle
Live: heating cycle
12 VDC
Stepping motor driven valve
opening
0-480 pulses (direct driven)
12 VDC
Stepping motor driven valve
opening
1400 pulses
Check method
Resistance
check
Continuity
check with a
tester
Same as with
the indoor
LEV.
The resistance
values differs
from that of the
LEVs on in-
door unit.
(Refer to the
section on
Troubleshoot-
ing the
LEV(page 310
))
Same as with
the indoor
LEV.
GB