51- 51 -
HWE10170 GB
4. LEV
LEV operation
An LEV (Indoor unit: Linear expansion valve), is a stepping-motor-driven valve that operates by receiving the pulse signals
from the indoor and outdoor unit control boards.
1. Indoor LEV
The valve opening changes according to the number of pulses.
(1) Indoor controller board and LEV connection.
(2) Pulse signal output and valve operation
(3) LEV valve closing and opening operation
(A) Brown (F) White
(B) Red (G) Control board
(C) Blue (H) Connection (CN60,CN7V)
(D) Orange (I) Drive circuit
(E) Yellow (J) Linear expansion valve
4
3
6
5
2
1
(G)
(H)
(I)
(J)
(A)
(A)
(B)
(B)
(C)
(C)
(D)
(D)
(E)
(E)
(F)
(F)
12VDC
M
4
6
2
3
5
1
Output state
Output
(phase)
number
1234
1 ON OFF OFF ON
2 ON ON OFF OFF
3 OFF ON ON OFF
4 OFF OFF ON ON
Output pulses change in the following orders when the
Valve is closed; 1 2 3 4 1
Valve is open;
4 3 2 1 4
*1. When the LEV opening angle does not change,
all the output phases will be off.
*2. When the output is open phase or remains ON,
the motor cannot run smoothly, and rattles and vibrates.
*When the power is turned on, the valve closing signal of 2200 pulses
will be output from the indoor board to LEV to fix the valve position.
It must be fixed at point A .
When the valve operates smoothly, no sound from LEV or no vibration
occurs, however, when the pulses change from E to A in the chart or
the valve is locked, a big sound occurs.
*Whether a sound is generated or not can be determined by
holding a screwdriver against it, then placing your ear against the handle.
Valve opening (refrigerant flow rate)
Valve closed
Valve open
E
B
80 - 100 pulses
Pulses
Fully open: 2000 pulses
A
C
D
HWE10170.book 51 ページ ２０１１年７月１９日 火曜日 午後２時５７分
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