compresor on /off continusly

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3 weeks 1 day ago - 3 weeks 1 day ago #1479 by Emblemdhc
Air conditioning  switch in auto position  compressor continuously  On/off. 
Attachments:
  • VID-202405...0031.mp4

Last edit: 3 weeks 1 day ago by Mark.

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3 weeks 1 day ago #1480 by Mark
Replied by Mark on topic compresor on /off continusly
Could I get a aircraft type and possibly a schematic?

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3 weeks 1 day ago - 3 weeks 1 day ago #1481 by Emblemdhc
  Aircraft -Cessna CJ2
Last edit: 3 weeks 1 day ago by Emblemdhc.

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3 weeks 1 day ago - 3 weeks 1 day ago #1482 by Mark
Replied by Mark on topic compresor on /off continusly
Bypass "Binary Pressure Switch" (Jumper it with CB-2 pulled as this is a hot circuit).

The coil in "Motor Power Relay" might be going bad (Opening when hot - closing when cold).

I would think the second is probably more correct. Pull CB-1 and put a meter across the power contacts of relay. See if it opens and closes continuously. That diode shown below the power relay is a Suppression Diode , it could be breaking down also. Most are built into the relay itself.... if not, one side of it can be disconnected for testing purposes.

You said "Auto" position. I see no "auto" on your print.
Last edit: 3 weeks 1 day ago by Mark.

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3 weeks 1 day ago - 3 weeks 1 day ago #1483 by Emblemdhc
 

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please check this wiring diagram it include Auto switch and other signal to turn on/off  compressor
Last edit: 3 weeks 1 day ago by Emblemdhc.

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3 weeks 11 hours ago #1484 by Mark
Replied by Mark on topic compresor on /off continusly
There is a little more going on as shown on the second print.

I would still stick with what I mentioned above as a first step.

You can backtrack on the compressor control relay coil for 28 VDC. It has a hard wired ground, so there is nothing to follow on the ground side.

First stop is the binary pressure switch. Is 28 present? Is it cycling?

If cycling, move upstream to PT040 or the Evap Fan Freeze Protection Switch. Is 28 present? Is it cycling?

Next up is K2.... Is 28 present at Pin 15? Is it cycling? Is the cycling caused by the relay? If so,change paths and follow that relay voltage.

Let the VOM tell you where the problem is. A schematic or wiring print is just a road map. Somewhere, there's a back-up, blockage, break..... seek the problem out.

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2 weeks 6 days ago #1485 by Emblemdhc
The condensor motor was found faulty sir 
what thumb rule you follow during troubleshooting. 
 

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