Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 82

[3-3 Functions of the Major Components of Outdoor Unit ]
Part Symbols
name (functions)
Sole- SV1a
noid Discharge-
valve suction
bypass
SV2
SV9
SV10
SV11
SV14, 15 EM200-
EM450
models
only
Linear LEV1
expan- (SC control)
sion
valve
LEV9
(Refrigerant
flow adjust-
ment)
LEV4
LEV2a
(Refrigerant
flow adjust-
ment)
LEV2b
(Refrigerant
flow adjust-
ment)
LEV2c (E)M500
(Refrigerant model
flow adjust- only
ment)
4-way 21S4a
valve
21S4b
21S4c (E)M500
models
only
BS_03_E
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
Continuous heating cycle mode
Continuous heating cycle mode
Controls outdoor unit heat ex-
changer capacity
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
Injection amount control
Adjusts refrigerant flow during
heating
Cut off the refrigerant flow during
continuous heating cycle
Changeover between heating and
cooling
1) Changeover between heating
and cooling
2) Controls outdoor unit heat ex-
changer capacity
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
(1) Normal direction flow
Open while being powered/
closed while not being pow-
ered
(2) Reverse direction flow
Closed while being powered/
open while not being powered
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
DC12V
Opening of stepping motor
driving valve 0-480 pulses
(direct driven type)
DC12V
Opening of a valve driven by a
stepping motor 2100 pulses
(Max. 3000 pulses)
AC220-240V
Dead: cooling cycle
Live: heating cycle
AC220-240V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 25%, 50%
or heating cycle
Check method
Continuity check
with a tester
Refer to the follow-
ing page(s). [8-8
Troubleshooting
LEV, FCV Prob-
lems]
Continuity Test 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
15
chapter 3 -