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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 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
2
1
M
4
1
5
3
<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
Open
Close
A
Close
B
Extra tightening (about 32 pulse)
OCH744
(LEV) in Branch box
Output
4
5
6
7
8
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
Open
500 pulse
Opening a valve
all the way
Pulse number
Red
ø4
Blue
ø3
Orange
Yellow
ø2
ø1
White
Connector LEV-A
LEV-B
LEV-C
LEV-D
LEV-E
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
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.
16
branch box controller board
12 VDC
Drive circuit
1
ø4
2
ø3
3
ø2
4
ø1
5
or when the valve is locked, sound can
A
to
in
B
A
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