Daikin VRV III, Руководство по обслуживанию, Страница: 362 / 567

SiUS34-801A_b Troubleshooting by Indication on the Remote Controller
Troubleshooting 347
Troubleshooting
NO
Electronic
expansion valve is
connected to X7A of
indoor unit PC
board.
Coil
check (
∗
1) of
electronic expansion valve
drive indicates
normal.
NO
NO
YES
Relay
cables short circuit or
disconnected.
YES
Shut the power supply off after
connection and then restart.
Replace coil of electronic
expansion valve.
Replace relay cables.
When restarting the operation after
shutting the power supply off does
not work, replace indoor unit PC
board.
NO
Replace electronic expansion
valve main body.
When power is supplied.
YES
YES
∗
1: How to check the coil of electronic expansion valve drive
Remove the connector for electronic expansion valve (X7A) from PC board. Measure the resistance
value between pins and check the continuity to judge the condition.
1) White
2) Yellow
3) Orange
4) Blue
6) Brown
5) Red
The normal products will show the following conditions:
No continuity between (1) and (2)
Resistance value between (1) and (3) is approx. 300
Ω
Resistance value between (1) and (5) is approx. 150
Ω
Resistance value between (2) and (4) is approx. 300
Ω
Resistance value between (2) and (6) is approx. 150
Ω
White (1)
Red (5)
Orange (3)
φ
1
φ
3
Yellow
(2)
Brown
(6)
Blue
(4)
φ
2
φ
4
M
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.