Bypassing the low pressure switch will cause the compressor to run any
time the PBCU calls for it, although it will still switch off as
evaporator temp drops or it is cycled for temp control. The low
pressure switch on protects against inadequate freon (and no compressor
lubrication). Do not leave it shorted, if it's low, get it pumped out
and fix the leak, then replace the switch and properly recharge.
I heat the cans of freon in some hot tap water (only as hot as the
water heater delivers it!) making sure the can stays upright. If you
leave it at room temp, it can take forever to transfer because the low
side pressure is too high.
I would strongly recommend against adding freon to a system without a
working gauge set -- it's fairly easy to add too much and blow a high
side hose!
Peter
On Wednesday, August 10, 2005, at 04:02 PM, [EMAIL PROTECTED]
wrote:
Hey Dave,
Someone correct me if I am wrong but with the switch bypassed the
compressor should never cycle just always stay on. Correct?
In that case you either have air in the system or not enough
refrigirant. how long did it take to add the refrigirant? One of my
vehicles needed a can of r-12 and in 96* weather it took a good 30
minutes to empty the can.
-------------- Original message --------------
> George,
>
> In this case, that's definitely not the problem. ;-) After evacuating
> and recharging with R-12 this spring, I then discovered the
> combination low/high pressure switch did not work. So it's shorted
> right now - there is no low or high pressure safety at the moment. I
> believe the charge is good although I will put gauges on it this
> weekend to confirm that.
>
> :-)
>
> -Dave M.
>
> > ------------------------------
> > Date: Tue, 09 Aug 2005 22:01:12 +0000
> > From: [EMAIL PROTECTED]
> > Subject: Re: [MBZ] W124 A/C question - compressor cuts off too
soon?
> >
> >
> > Hey Dave,
> >
> > A compressor cycling too often is usualy due to a low charge. Can't
> > confirm without low & high pressures.
> >
> > Basicaly when there is not enough refrigirant, the low side
pressure
> > drops too low and the low pressure cut off switch turns off the
compressor.
> >
> > Depending on when your system was made there could also be a high
> > pressure cut off switch as well.
> >
> > Good luck
> >
> > George
>
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