Power Supply Waveforms Check; Electronic Expansion Valve Check - Daikin FTX20JV1B Service Manual
Inverter pair wall mounted type j-series
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Also See for FTX20JV1B:
- Service manual (267 pages) ,
- Operation manual (26 pages) ,
- Installation manual (16 pages)
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Check
5.3
Power Supply Waveforms Check
Check No.11
Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
Fig.1
5.4
Electronic Expansion Valve Check
Check No.12
Conduct the followings to check the electronic expansion valve (EV).
1. Check if the EV connector is correctly connected to the PCB.
2. Turn the power off and on again, and check if the EV generates a latching sound.
3. If the EV does not generate a latching sound in the above step 2, disconnect the connector
4. Check the continuity between the pins 1 - 6, 3 - 6, 2 - 5, 4 - 5 (between the pins 1 - 6, 2 - 6, 3 - 6,
5. If the continuity is confirmed in step 3, the outdoor unit PCB is faulty.
Note:
Please note that the latching sound varies depending on the valve type.
87
Check if the power supply waveform is a sine wave. (Fig.1)
Check if there is waveform disturbance near the zero cross. (sections circled in Fig.2)
and check the continuity using a tester.
4 - 6 for the harness 5P models). If there is no continuity between the pins, the EV coil is faulty.
Harness 6P
S20
Check
6P Connector
1 2 3 4 5 6
Fig.2
(R1736)
Harness 5P
1 - 6
3 - 6
S20
6P Connector
2 - 5
4 - 5
1 2 3 4 5 6
(R16385)
SiBE041010EA
(R1444)
1 - 6
(5)
2 - 6
Check
3 - 6
4 - 6
(R16386)
Service Diagnosis
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