Mitsubishi Electric R410A Service Handbook page 68

[3-3 Functions of the Major Components of Outdoor Unit ]
Part Symbols
name (functions)
Solenoid SV1a
valve Discharge-suc-
tion
bypass
SV5b
Heat
exchanger
capacity control
SV9
SV2
Linear LEV1
expan- (SC control)
sion
valve
LEV2a
(Refrigerant
flow adjustment)
LEV2b
(Refrigerant
flow adjustment)
4-way 21S4a
valve
21S4b
21S4c
Fan mo- FAN motor 1,2
tor
HWE14080
Notes Usage
1) High/low pressure by-
pass at start-up and
stopping, and capacity
control during low-load
operation
2) High-pressure-rise
prevention
P120, Controls outdoor unit heat
P144, exchanger capacity
and
P168
models
only
High-pressure-rise preven-
tion
High-Low pressure bypass
during defrost
Adjusts the amount of by-
pass flow from the liquid
pipe on the outdoor unit
during cooling
Adjusts refrigerant flow
during heating
Changeover between heat-
ing and cooling
1) Changeover between
heating and cooling
P120,
2) Controls outdoor unit
P144,
heat exchanger ca-
and
pacity
P168
models
only
FAN Regulates the heat ex-
motor 2 changer capacity by adjust-
is only ing the operating frequency
on the and operating the propeller
P120, fan based on the operating
P144, pressure.
and
P168
models.
- 59 -
Specifications
AC208-230V
Open while being powered/
closed while not being powered
AC208-230V
Closed while being powered/
open while not being powered
AC208-230V
Open when on, closed when off
AC208-230V
Open when on, closed when off
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
(direct driven type)
DC12V
Opening of a valve driven by a
stepping motor 2100 pulses
(Max. 3000 pulses)
AC208-230V
Dead: cooling cycle
Live: heating cycle
AC208-230V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 100%
or heating cycle
(TLMU)
AC200-230V, 920W
(YLMU)
AC380-400V, 920W
Check method
Continuity check
with a tester
Same as indoor
LEV
The resistance
value differs from
that of the indoor
LEV.
Refer to the fol-
lowing page(s).
[8-8 Trouble-
shooting LEV
Problems](page
258)
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
Continuity check
with a tester
GB