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Linear expansion valve
(1) Operation summary of the linear expansion valve
• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the branch box controller
board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the branch box 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
3
OFF
OFF
OFF
4
OFF
OFF
OFF
(2) Linear expansion valve operation
Close
Extra tightening (about 32 pulse)
(LEV) in Branch box
Output
5
6
7
8
4
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Open
500 pulse
Opening a valve
all the way
Pulse number
Brown
4
Blue
3
Orange
Yellow
2
1
White
Connector LEV-A
LEV-B
LEV-C
LEV-D
LEV-E
Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8
Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1
The output pulse shifts in above order.
• When linear expansion valve operation stops, all output phase
become OFF.
• When the switch is turned on, 700 pulse closing valve signal will be
sent till it goes to
point in order to define the valve position.
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
to
B
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.
44
branch box controller board
DC12V
Red
1
Drive circuit
2
3
4
5
6
or when the valve is locked, sound can
A
4
3
2
1
to
in
B
A
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