Roof A/C

C

chuck blanford

New member
Feb 6, 1998
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I am also interested in the answer to this post. My compressor doesn't
kick in for several minutes, but seems to function well and stay on line
once it does.

Chuck

- ----------
> From: Dave Lowry
> To: gmcmotorhome
> Subject: GMC: Roof A/C
> Date: Monday, August 17, 1998 2:02 PM
>
> Arch (or anyone else who might know);
>
> The recent post re: capacitors reminded me of another abnormality I have
> not yet dealt with. Whenever we start the roof a/c, the fan comes on
> immediately but the compressor doesn't kick in for 60 to 90 seconds. Once
> working, it cools well and has never failed, but I'm worried that one day
> it will. We're about to leave on a coast-to-coast-to-coast trip (7,000
mi.
> or so), and will certainly need the a/c to work.
>
> Is it likely to fail without further warning? How can I prevent failure,
or
> fix it when it fails?
>
> I can't get onto the roof to fix it myself, but I'd sure like to have an
> idea what was wrong before I had someone else get up there an play with
it
> at my expense.
>
> I travel with all the manuals (thanks to Cinnabar) and many useful snips
> from the posts on GMCnet, but I haven't found any mauals for the old a/c.
>
> Any ideas what's going on?
>
> TIA, Dave
>
> ps: I too look forward to the daily GMCnet e-mail. I wouldn't be keeping
> this beautiful but needy old girl were it not for all the information and
> assistance available here. Thanks all!
>
 
Arch (or anyone else who might know);

The recent post re: capacitors reminded me of another abnormality I have
not yet dealt with. Whenever we start the roof a/c, the fan comes on
immediately but the compressor doesn't kick in for 60 to 90 seconds. Once
working, it cools well and has never failed, but I'm worried that one day
it will. We're about to leave on a coast-to-coast-to-coast trip (7,000 mi.
or so), and will certainly need the a/c to work.

Is it likely to fail without further warning? How can I prevent failure, or
fix it when it fails?

I can't get onto the roof to fix it myself, but I'd sure like to have an
idea what was wrong before I had someone else get up there an play with it
at my expense.

I travel with all the manuals (thanks to Cinnabar) and many useful snips
from the posts on GMCnet, but I haven't found any mauals for the old a/c.

Any ideas what's going on?

TIA, Dave

ps: I too look forward to the daily GMCnet e-mail. I wouldn't be keeping
this beautiful but needy old girl were it not for all the information and
assistance available here. Thanks all!
 
If I'm not mistaken, the roof top A/C manual points out that there is a
delayed start for the compressor. I'm not at home now and don't have my
manual available to me to tell you the reason.

Paul Bartz

From: Chuck Blanford [mailto:Chuck.Blanford]
Sent: Monday, August 17, 1998 1:48 PM
Subject: Re: GMC: Roof A/C

I am also interested in the answer to this post. My compressor doesn't
kick in for several minutes, but seems to function well and stay on line
once it does.

Chuck

From: Dave Lowry
Subject: GMC: Roof A/C
Date: Monday, August 17, 1998 2:02 PM

Arch (or anyone else who might know);

The recent post re: capacitors reminded me of another abnormality I have
> not yet dealt with. Whenever we start the roof a/c, the fan comes on
> immediately but the compressor doesn't kick in for 60 to 90 seconds.
Once
> working, it cools well and has never failed, but I'm worried that one
day
> it will. We're about to leave on a coast-to-coast-to-coast trip (7,000
mi.
> or so), and will certainly need the a/c to work.
>
> Is it likely to fail without further warning? How can I prevent
failure,
or
> fix it when it fails?
>
> I can't get onto the roof to fix it myself, but I'd sure like to have
an
> idea what was wrong before I had someone else get up there an play
with
it
> at my expense.
>
> I travel with all the manuals (thanks to Cinnabar) and many useful
snips
> from the posts on GMCnet, but I haven't found any mauals for the old
a/c.
>
> Any ideas what's going on?
>
> TIA, Dave
>
> ps: I too look forward to the daily GMCnet e-mail. I wouldn't be
keeping
> this beautiful but needy old girl were it not for all the information
and
> assistance available here. Thanks all!
>
 
>
> The recent post re: capacitors reminded me of another abnormality I have
> not yet dealt with. Whenever we start the roof a/c, the fan comes on
> immediately but the compressor doesn't kick in for 60 to 90 seconds. Once
> working, it cools well and has never failed, but I'm worried that one day
> it will. We're about to leave on a coast-to-coast-to-coast trip (7,000 mi.
> or so), and will certainly need the a/c to work.

Dave,

Has this unit always behaved this way as long as you've owned it or did
it just start doing this recently. IIRC, the roof a/c on my father's
old HRC trailer also had a delayed start on the compressor. This was a
safety feature to prevent compressor damage if the power went out and
came back on quickly. It allowed refrigerant pressures to equalize
before the compressor restarted.

Patrick
- --
Patrick Flowers
Mailto:patri63

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
Mine works the same way and at first I thought I would have to replace it.
It runs fine and appears to be designed to run that way.

>Arch (or anyone else who might know);
>
>The recent post re: capacitors reminded me of another abnormality I have
>not yet dealt with. Whenever we start the roof a/c, the fan comes on
>immediately but the compressor doesn't kick in for 60 to 90 seconds. Once
>working, it cools well and has never failed, but I'm worried that one day
>it will. We're about to leave on a coast-to-coast-to-coast trip (7,000 mi.
>or so), and will certainly need the a/c to work.
>
>Is it likely to fail without further warning? How can I prevent failure, or
>fix it when it fails?
>
>I can't get onto the roof to fix it myself, but I'd sure like to have an
>idea what was wrong before I had someone else get up there an play with it
>at my expense.
>
>I travel with all the manuals (thanks to Cinnabar) and many useful snips
>from the posts on GMCnet, but I haven't found any mauals for the old a/c.
>
>Any ideas what's going on?
>
>TIA, Dave
>
>ps: I too look forward to the daily GMCnet e-mail. I wouldn't be keeping
>this beautiful but needy old girl were it not for all the information and
>assistance available here. Thanks all!
>
>
>
>
 
Many of the a/c units deliberately start the fan and then the compressor about
a minute or two later. Mine work that way and I just wait a few minutes and
then the compressor comes. It may be that your's is the same.

regards Al Chernoff

> Arch (or anyone else who might know);
>
> The recent post re: capacitors reminded me of another abnormality I have
> not yet dealt with. Whenever we start the roof a/c, the fan comes on
> immediately but the compressor doesn't kick in for 60 to 90 seconds. Once
> working, it cools well and has never failed, but I'm worried that one day
> it will. We're about to leave on a coast-to-coast-to-coast trip (7,000 mi.
> or so), and will certainly need the a/c to work.
>
> Is it likely to fail without further warning? How can I prevent failure, or
> fix it when it fails?
>
> I can't get onto the roof to fix it myself, but I'd sure like to have an
> idea what was wrong before I had someone else get up there an play with it
> at my expense.
>
> I travel with all the manuals (thanks to Cinnabar) and many useful snips
> from the posts on GMCnet, but I haven't found any mauals for the old a/c.
>
> Any ideas what's going on?
>
> TIA, Dave
>
> ps: I too look forward to the daily GMCnet e-mail. I wouldn't be keeping
> this beautiful but needy old girl were it not for all the information and
> assistance available here. Thanks all!
 
Date: Mon, 17 Aug 1998 12:02:06 -0700
From: dlowry (Dave Lowry)
Subject: GMC: Roof A/C
My 78 Kingsley works the same with the fan coming on and then the compressor
90 seconds latter. I think it is the way the system works. It allows the
fan to come up to speed and then compressor to reduce head pressure when it
cycles on and off. So you should be ok, and have a great trip.
Thank You
Tim Jones
timjones
 
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