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Linear expansion valve
(1) Operation summary of the linear expansion valve
• Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the outdoor controller board and the linear expansion valve>
LEV
3
2
M
1
5
4
6
<Output pulse signal and the valve operation>
Output
(Phase)
1
2
3
ø1
ON
ON
OFF
ø2
OFF
ON
ON
ø3
OFF
OFF
OFF
ø4
OFF
OFF
OFF
(2) Linear expansion valve operation
Close
A
B
Extra tightening (about 32 pulse)
OCH754A
(KA30/36)
Output
5
6
7
8
4
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
OFF
C
Open
500 pulse
Opening a valve
all the way
Pulse number
ø4
Orange
ø3
Yellow
ø2
ø1
Black
Connector LEV-A
LEV-B
LEV-C
The output pulse shifts in the following order.
Opening a valve: 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8
Closing a valve: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1
• When linear expansion valve operation stops, all output phases
become OFF.
• When the power is turned on, 700 pulse closing valve signal will
be sent till it goes to
A
(The pulse signal is being sent for about 20 seconds.)
• When the valve moves smoothly, there is no sound or vibration
occurring from the linear expansion valve; however, when the
pulse number moves from
sound can be heard than normal situation.
No sound is heard when the pulse number moves from
case coil is burn out or motor is locked by open-phase.
• Sound can be detected by placing the ear against the screw driver
handle while putting the screw driver to the linear expansion valve.
53
Outdoor controller board
12 V DC
Gray
1
Drive circuit
ø4
2
ø3
Red
3
ø2
4
ø1
5
point in order to define the valve position.
to
or when the valve is locked,
B
A
to
in
B
A
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Troubleshooting
