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Old 04-26-2012, 01:36 PM
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A/C Elec. issues

I have a 2010 International 7400 work star. After the A/C runs for 10 minutes or so the hot wire to the compressor losses its power. It has one 5 amp fuse labled cab HVAC control , one 10 amp circuit breaker for cab HVAC controller, and one 10 amp circuit breaker for cab HVAC L P M.
If you kill the engine and let it sit for a few minutes and then crank it back up, The A/C will work again for another 10 or 15 minutes. Any suggetions as to what is causing this? And yes the Circuit breakers have been changed and the 5 amp fuse is good.

Does anyone know what the L P M stands for?

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Old 04-26-2012, 04:02 PM
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A lot of AC systems have a over and under pressure safety switch. My guess is after 10 minutes the internal pressure in the system is going out of spec and shutting the compressor off to keep from damaging the system. The switch is usually in a line near the dryer. If you put a set of gauges on it you may see the pressure slowly build or drop as it is running. This could be due to some sort of restriction somewhere in the system.
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Old 04-26-2012, 04:59 PM
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Thanks T-Bucket. You were absolutely correct. It was the high pressure switch. It was opening the circuit early. After I posted that I changed the high switch and it corrected the problem.
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Old 04-26-2012, 05:37 PM
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Quote:
Originally Posted by sideshowbh
Thanks T-Bucket. You were absolutely correct. It was the high pressure switch. It was opening the circuit early. After I posted that I changed the high switch and it corrected the problem.
Thanks for posting back
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