Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 63

[3-4 Functions of the Major Components of Outdoor Unit ]
Part Symbols
name (functions)
Sole- SV1a
noid Discharge-
valve suction
bypass
SV2
SV9
SV10
SV11
Linear LEV1
expan- (SC control)
sion
valve
LEV9
(Refrigerant
flow adjust-
ment)
LEV2a
(Refrigerant
flow adjust-
ment)
LEV2b
(Refrigerant
flow adjust-
ment)
4-way 21S4a
valve
21S4b
Fan FAN motor 1
motor
14
- chapter 3
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
Makes excessive refrigerant in the
accumulator evaporate
High-pressure-rise prevention
-
-
Adjusts the amount of bypass flow
from the liquid pipe on the outdoor
unit during cooling
Adjusts the flow of refrigerant by-
passed from the pipe for cooling
the control board when the control
board temperature rises
-
Control refrigerant distribution
(OC and OS)
Control refrigerant distribution
(OC and OS)
Heat exchanger capacity control
Regulates the heat exchanger ca-
pacity by adjusting the operating
frequency and operating the pro-
peller fan based on the operating
pressure.
Specifications
AC220-240V
Open while being powered/
closed while not being pow-
ered
Open while being powered/
closed while not being pow-
ered
Open while being powered/
closed while not being pow-
ered
Open while being powered/
closed while not being pow-
ered
Open while being powered/
closed while not being pow-
ered
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
DC12V
Opening of a valve driven by a
stepping motor 2100 pulses
(Max. 3000 pulses)
AC220-240V
AC220-240V
AC380-400V, 920W
Check method
Continuity check
with a tester
Same as indoor
LEV
The resistance val-
ue differs from that
of the indoor LEV.
Refer to the follow-
ing page(s). [8-8
Troubleshooting
LEV Problems]
Continuity check
with a tester
Continuity between
white and orange.
Continuity between
yellow, red, and
blue.
White
M
Orange
Yellow red Blue
Continuity check
with a tester
BS_03_C