Mitsubishi Electric PUHY-(E)P200 Service Handbook page 85

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Sole- SV1a
noid Discharge-suc-
valve tion
bypass
SV5b
Heat
exchanger
capacity control
SV5c
SV9
Linear LEV1
expan- (SC control)
sion
valve
LEV2a
LEV2b
(Refrigerant
flow adjust-
ment)
Heater CH11
4-way 21S4a
valve
21S4b
21S4c
HWE07010
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 outdoor unit heat ex-
changer capacity
P350 -
P450
EP300
mod-
els only
High-pressure-rise prevention
Adjusts the amount of bypass flow
from the liquid pipe on the outdoor
unit during cooling
Adjusts refrigerant flow during
heating
Heats the refrigerant in the com-
pressor
Changeover between heating and
cooling
1) Changeover between heating
and cooling
P350 -
2) Controls outdoor unit heat ex-
P450
changer capacity
EP300
mod-
els only
AC208-230V
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
(direct driven type)
DC12V
Opening of a valve driven by a
stepping motor 1400 pulses
Cord heater AC230V
P200 - P250 models
1511 ohm 35W
P300 - P450 models
1176 ohm 45W
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 50%
or heating cycle
- 76 -
Specifications 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 226
))
Same as in-
door LEV
Resistance
check
Continuity
check with a
tester
GB