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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
5
1
6
4
<Output pulse signal and the valve operation>
Output
(Phase)
1
2
3
[1
ON
ON
OFF
[2
OFF
ON
ON
OFF
OFF
OFF
[3
[4
OFF
OFF
OFF
(2) Linear expansion valve operation
Open
Close
A
Close
B
Extra tightening (about 32 pulse)
OCH756
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
Open
500 pulse
Opening a valve
all the way
Pulse number
Orange
[4
[3
Yellow
[2
Black
[1
Connector LEV-A
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.
· No sound is heard when the pulse number moves from
case coil is burnt 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.
39
Outdoor controller board
12 V DC
1
Gray
Drive circuit
[4
2
[3
Red
3
[2
4
[1
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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