Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 150

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Sole- SV1a
noid Discharge-suc-
valve tion
bypass
SV4a, SV4b,
SV4d
Heat
exchanger
capacity control
SV7a,7b
Heat
exchanger
capacity control
SV7c
Heat
exchanger
capacity control
SV9
Heater CH11
4-way 21S4a
valve
21S4b
Elec- LEVINV
tronic
expan-
sion
LEV1
valve
(for SC control)
LEV6
LEV7
HWE15060
Notes Usage
1) High/low pressure bypass at
start-up and stopping, and
capacity control during low-
load operation
2) High-pressure-rise preven-
tion
Controls heat source unit heat ex-
changer capacity
Controls heat source unit heat ex-
changer capacity
P350 Controls heat source unit heat ex-
P400 changer capacity
P450
P500
P550
P600
models
only
PQRY High-pressure-rise prevention
only
Heats the refrigerant in the com-
pressor
Changeover between heating
and cooling
P350
P400
P450
P500
P550
P600
models
only
Controlling the refrigerant flow in
the inverter cooling heat ex-
changer
PQHY Regulates the amount of bypass
only flow from the heat source unit liq-
uid pipe during cooling
Controls heat source unit heat ex-
changer capacity
- 141 -
Specifications
AC220 - 240V
Open while being powered/
closed while not being pow-
ered
AC220 - 240V
Open while being powered/
closed while not being pow-
ered
AC220 - 240V
Open while being powered/
closed while not being pow-
ered
AC220 - 240V
Closed while being powered/
open while not being pow-
ered
Cord heater
1280 ohm 45W
AC220-240V
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
41 - 3000 pulses
Check method
Continuity check
with a tester
Resistance
check
Continuity check
with a tester
Same as with
the indoor LEV.
The resistance
values differs
from that of the
LEVs on indoor
unit.
(Refer to the
section on Trou-
bleshooting the
LEV(page 353))
Refer to the sec-
tion "Continuity
Test with a Tes-
ter".
Continuity be-
tween white and
orange.
Continuity be-
tween yellow,
brown, and blue.
White
M
Orange
Yellow Brown Blue
GB