Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 81

[ VI Refrigerant Circuit ]
Symbols
Part name
(functions)
Solenoid SV1a
valve Discharge-
suction
bypass
SV2
SV6
SV9
Linear ex- LEV1
pansion (SC control)
valve
LEV2a
LEV2b
(Refrigerant
flow adjust-
ment)
LEV4
Heater CH11
4-way valve 21S4a
HWE0716A
Notes Usage
1) High/low pressure bypass at
start-up and stopping, and ca-
pacity control during low-load
operation
2) High-pressure-rise prevention
High/low pressure bypass at heat-
ing startup in low temperature or at
resuming operation after the com-
pletion of the defrost cycle
Changes bypass flow path from liq-
uid pipe (or 2-phase liquid pipe) on
the outdoor unit
1) High/low pressure bypass at
heating startup in low tempera-
ture or at resuming operation
after the completion of the de-
frost cycle
2) Capacity control during low-
load heating operation
Adjusts the amount of bypass flow
from the liquid pipe on the outdoor
unit during cooling
Adjusts refrigerant flow during heat-
ing
Opening and closing control of in-
jection circuit
Heats the refrigerant in the com-
pressor
Changeover between heating and
cooling
- 72 -
Specifications
AC208-230V
Open while being powered/
closed while not being pow-
ered
DC12V
Opening of a valve driven by
a stepping motor 0-480 puls-
es (direct driven type)
DC12V
Opening of a valve driven by
a stepping motor 1400 puls-
es
DC12V
Degree of stepping motor
valve closing 0 - 480 pulses
(direct driven type)
Cord heater AC208/230V
CH11: 928ohm (230V)
AC208-230V
Dead: cooling cycle
Live: heating cycle
Check method
Continuity
check with a
tester
Same as in-
door LEV
The resistance
value differs
from that of the
indoor LEV.
(Refer to the
section "LEV
Troubleshooti
ng."(page 192
))
Same as in-
door LEV
Same as LEV1
Resistance
check
Continuity
check with a
tester
GB