74
<Output pulse signal and the valve operation>
(2) Linear expansion valve operation
Open
Extra tightening (about 32 pulse)
Pulse number
500 pulse
Opening a valve
all the way
Close
Valve position (capacity)
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 A 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 B to A or when the valve is locked,
sound can be heard.
No sound is heard when the pulse number moves from B to A
in 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 expan-
sion valve.
LEV
M
1
6
:4
:4
:3
:2
:1
1
Gray
Orange
Red
Yellow
Black
3
4
5
6
Connector LEV-A
DC12V
Outdoor controller board
Drive circuit
:3
:2
:1
3
2
5
4
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 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>
1
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
:1
Output
(Phase)
Output
:2
:3
:4
234
5678
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
ON
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