Installation manual

[ VI Refrigerant Circuit ]
- 81 -
HWE10040 GB
Sole-
noid
valve
SV1a
Discharge-suc-
tion
bypass
1) High/low pressure bypass at
start-up and stopping, and
capacity control during low-
load operation
2) High-pressure-rise preven-
tion
AC220-240V
Open while being powered/
closed while not being pow-
ered
Continuity
check with a
tester
SV5b
Heat
exchanger
capacity control
Controls outdoor unit heat ex-
changer capacity
AC220-240V
Closed while being powered/
open while not being powered
SV5c P350 -
P450
EP250·
EP300
mod-
els only
SV9 High-pressure-rise prevention Open while being powered/
closed while not being pow-
ered
Linear
expan-
sion
valve
LEV1
(SC control)
Adjusts the amount of bypass flow
from the liquid pipe on the outdoor
unit during cooling
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
(direct driven type)
Same as in-
door LEV
The resis-
tance value dif-
fers from that
of the indoor
LEV.
(Refer to the
section "LEV
Troubleshoot-
ing.")
(page 279)
LEV2
(Refrigerant
flow adjust-
ment)
Adjusts refrigerant flow during
heating
DC12V
Opening of a valve driven by a
stepping motor 2100 pulses
(Max. 3000 pulses)
Same as in-
door LEV
Heater CH11 Heats the refrigerant in the com-
pressor
Cord heater AC240V
P200 - P250, EP200 models
1511 ohm 35W
P300 - P450, EP250 - EP300
models
1176 ohm 45W
Resistance
check
4-way
valve
21S4a Changeover between heating and
cooling
AC220-240V
Dead: cooling cycle
Live: heating cycle
Continuity
check with a
tester
21S4b 1) Changeover between heating
and cooling
2) Controls outdoor unit heat ex-
changer capacity
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
21S4c P350 -
P450
EP250·
EP300
mod-
els only
Fan
motor
FAN motor 1,2 FAN
motor 2
is only
on the
P450
and
EP300
mod-
els.
Regulates
the heat exchanger ca-
pacity by adjusting the operating
frequency and operating the pro-
peller fan based on the operating
pressure.
AC342V, 50.5Hz, 920W
Part
name
Symbols
(functions)
Notes Usage Specifications Check method