Mitsubishi Electric PUHY-RP200 Service Handbook page 93

[ VI Refrigerant Circuit ]
Part Symbols
name (functions)
Sole- SV1a, SV1b
noid Discharge-suc-
valve tion
bypass
SV3
(Controls the
refrigerant flow
in the plate heat
exchanger.)
SV5b
Heat
exchanger
capacity control
SV8
(Controls the
refrigerant flow
during automat-
ic refrigerant
charging opera-
tion.)
SV9
Linear LEV1
expan- (SC control)
sion
valve
SLEV
(Refrigerant oil
return)
LEV2a
LEV2b
(Controls the
intermediate
pressure.)
Heater CH11
4-way 21S4a
valve
21S4b
HWE10130
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
(1) Controls the refrigerant flow
while cleaning the piping sys-
tem in the heating mode.
(2) Prevents the high pressure
from rising too high during
heating operation.
Controls outdoor unit heat ex-
changer capacity
Opens or closes as necessary
during automatic refrigerant
charging operation.
Allow refrigerant to bypass when
starting up in the heating mode at
low ambient pressure or when re-
suming normal operation after the
completion of defrost.
Adjusts the amount of bypass flow
from the liquid pipe on the outdoor
unit during cooling
Controls the amount of refrigerant
oil that returns to the compressor
from the accumulator.
Keeps the intermediate pressure
within a specific range during cool-
ing.
Heats the refrigerant in the com-
pressor
Changeover between heating and
cooling
1) Changeover between heating
and cooling
2) Controls outdoor unit heat ex-
changer capacity
- 84 -
Specifications
AC220-240V
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
RP200 model
1511 ohm 35W
RP250 - RP350 models
1176 ohm 45W
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 50%
or 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
Troubleshoot-
ing.")
(page 228)
Same as in-
door LEV
Resistance
check
Continuity
check with a
tester
GB