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LEV
3
2
M
Linear expansion valve
5
1
6
4
(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 circuit board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the outdoor controller circuit board and the linear expansion valve>
LEV
3
2
M
5
1
6
4
<Output pulse signal and the valve operation>
Output
Output
(Phase)
1
2
3
4
1
ON
ON
OFF
OFF
2
OFF
ON
ON
ON
3
OFF
OFF
OFF
ON
4
OFF
OFF
OFF
OFF
(2) Linear expansion valve operation
Close
Extra tightening (about 32 pulse)
OCH605A
5
6
7
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
ON
ON
Open
500 pulse
Opening a valve
all the way
Pulse number
Outdoor controller board
12 V DC
Gray
1
2
Orange
3
Red
4
Yellow
5
Black
6
Connector LEV-A
LEV-B
LEV-C
Outdoor controller board
12 V DC
Gray
1
2
Orange
Red
3
Yellow
4
Black
5
Connector LEV-A
LEV-B
Opening a valve : 8 7 6 5
Closing a valve : 1 2
The output pulse shifts in above order.
• 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 point in order to define the valve position. (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
to or when the valve is locked, sound can
be heard.
No sound is heard when the pulse number moves from to
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.
27
Drive circuit
Drive circuit
4
3
2 1
3
4
5 6 7
8
8
1
in
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