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- From: ghg@en.ecn.purdue.edu (George Goble)
- Subject: Re: AC compressor always engaged
- Message-ID: <1992Jul25.141806.24921@en.ecn.purdue.edu>
- Organization: Purdue University Engineering Computer Network
- References: <1992Jul23.112155.28589@dg-rtp.dg.com> <31160114@hpspkla.spk.hp.com>
- Date: Sat, 25 Jul 92 14:18:06 GMT
- Lines: 18
-
- In article <31160114@hpspkla.spk.hp.com> borowski@hpspkla.spk.hp.com (Don T. Borowski) writes:
- >Air conditioner compressors are controlled by electric clutch. Just pull
- >the wire off the compressor and see if it stops running. If it does, you
- >have an electrical problem. If is does not, then the electric clutch is
- >stuck in the engaged position, and need to be repaired or replaced.
- >
- >In normal operation, the compressor will cycle off and on, controlled by
- >the interior air temperature themostat and also (I believe) a pressure
- >switch.
-
- Some systems use a continuous running type of compressor, such as
- the "V-5" on GM cars. The V-5 is a "variable displacement" compressor.
- When the suction pressure drops to 28 PSIG (as the car cools down), the
- compressor reduces its stroke (capacity), as to hold the suction line
- at 28 PSIG. Other systems use cont run compressor use "POA" or other
- valves to throttle the suction line to cause capacity control.
- These cont run systems save wear on the compressor clutch.
- --ghg
-