| Rooftop AC sloooow to start [message #92919] |
Thu, 22 July 2010 21:22  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Is there any reason why my rooftop AC should take about 5 minutes to start? Once she's running everything is good, but it's a nail-biter for a while.
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Rooftop AC sloooow to start [message #92921 is a reply to message #92919] |
Thu, 22 July 2010 21:34  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Larry,
We may need a little more info.
Do you mean that the fan is running but there is a five minute delay before the compressor kicks on and starts cooling? The original AC's had, I believe, a 90 second start delay. Some owners have mentioned disabling the delay. I do not know if it is adjustable.
Maybe it just seems like five minutes when it is hot.
Sent while holding my breath.
Dennis Sexton
73 230 Painted Desert
Germantown, TN
USA
-----Original Message-----
From: Larry Davick <ljdavick@comcast.net>
To: gmclist@temp.gmcnet.org
Sent: Thu, Jul 22, 2010 9:22 pm
Subject: [GMCnet] Rooftop AC sloooow to start
Is there any reason why my rooftop AC should take about 5 minutes to start?
nce she's running everything is good, but it's a nail-biter for a while.
-
arry Davick
he Mystery Machine
976 Palm Beach
remont, Ca
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Rooftop AC sloooow to start [message #92923 is a reply to message #92921] |
Thu, 22 July 2010 22:00 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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My 1977 vintage unit takes a few min before it turns on. Seems like 3-5 min. My 1994 vintage unit comes on right away. both suck. I am replacing them with something completely different...
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Rooftop AC sloooow to start [message #92939 is a reply to message #92921] |
Thu, 22 July 2010 23:59 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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I'll have to time it. Basically I turn the switch and nothing happens for an eternity! I had thought about the delay circuit, but couldn't think of a scenario where it would fail like that. It seems to me that it either works, or it doesn't. With the recent work to the Onan I thought that might be the problem (I've just replaced the bridge rectifier.) But plugging in to A/C still brings slow AC.
The first time this happened I checked the breakers, put a volt meter in an outlet, but everything seemed fine, then she turned on.
Larry Davick
Doing nothing noteworthy at the moment
On Jul 22, 2010, at 7:34 PM, dennisfsexton@aol.com wrote:
>
> Larry,
> We may need a little more info.
> Do you mean that the fan is running but there is a five minute delay before the compressor kicks on and starts cooling? The original AC's had, I believe, a 90 second start delay. Some owners have mentioned disabling the delay. I do not know if it is adjustable.
> Maybe it just seems like five minutes when it is hot.
>
> Sent while holding my breath.
>
>
> Dennis Sexton
> 73 230 Painted Desert
> Germantown, TN
> USA
>
>
>
> -----Original Message-----
> From: Larry Davick <ljdavick@comcast.net>
> To: gmclist@temp.gmcnet.org
> Sent: Thu, Jul 22, 2010 9:22 pm
> Subject: [GMCnet] Rooftop AC sloooow to start
>
>
>
> Is there any reason why my rooftop AC should take about 5 minutes to start?
> nce she's running everything is good, but it's a nail-biter for a while.
> -
> arry Davick
> he Mystery Machine
> 976 Palm Beach
> remont, Ca
> ______________________________________________
> MCnet mailing list
> ist Information and Subscription Options:
> ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
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> List Information and Subscription Options:
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: Rooftop AC sloooow to start [message #92941 is a reply to message #92919] |
Fri, 23 July 2010 00:44 |
aaaa
Messages: 13
Registered: April 2010
Karma: 0
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Junior Member |
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There is a built in delay at the factory 3-4min for the generator to stabilize prior to the compressor starting.
On my 78 Birchaven it averages about 3.5 minutes.
Hope it helps.
Ken Morris
Modesto California
1978 Birchaven
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| Re: [GMCnet] Rooftop AC sloooow to start [message #92946 is a reply to message #92941] |
Fri, 23 July 2010 04:21 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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There is a compressor start delay timer in the circuit. If you take off the
fibreglass outer cover, you will see a metal electrical cover on the drivers
side of the unit held on by a single screw. Make sure the unit is not
energized. Spray the relay contacts with contact cleaner and follow up with
clean compressed air. Not too much pressure, this stuff is old and somewhat
delicate. When you are very sure the cleaner has all evaporated, start the
unit and watch the relay. If you are on a ladder, be careful and don't be
suprised when the compressor cycles on, lose your balance and fall. It makes
a lot more noise on top of the coach than it does when you are inside it.
There is a way to bypass the relay so the compressor starts when you switch
the unit on, but it puts a larger ampere load on the circuit than starting
the fan and then the compressor. Seems like a long time when you are waiting
to cool off though. It is the way the unit was intended to operate.
Jim Hupy
Salem, Or
78 Royale 403
On Thu, Jul 22, 2010 at 10:44 PM, Ken Morris <ken@aaaaimage.com> wrote:
>
>
> There is a built in delay at the factory 3-4min for the generator to
> stabilize prior to the compressor starting.
>
> On my 78 Birchaven it averages about 3.5 minutes.
>
> Hope it helps.
> _______________________________________________
> GMCnet mailing list
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| Re: Rooftop AC sloooow to start [message #92992 is a reply to message #92919] |
Fri, 23 July 2010 15:11 |
WayneB
Messages: 233
Registered: July 2008
Location: Ontario, Canada
Karma: 0
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My roof air (Coleman Mach 1)can be turned on fully starting as soon as my 4000 Onan emerald generator is running.
I wasn't aware of any delay system ever being used (unless Explorer decided to remove it)
1976 23' GMCII By Explorer
[Updated on: Fri, 23 July 2010 20:25] Report message to a moderator |
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| Re: [GMCnet] Rooftop AC sloooow to start [message #93001 is a reply to message #92969] |
Fri, 23 July 2010 17:23 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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| ljdavick wrote on Fri, 23 July 2010 11:05 |
Chris said
"I am replacing them with something completely different..."
And what might that be?
Larry Davick
On Jul 22, 2010, at 8:00 PM, Chris Choffat <cchoffataz@yahoo.com> wrote:
> I am replacing them with something completely different...
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i hear the Penguin AC is very quiet. my Colman is really loud but was a couple of hundred buck cheaper. now i'm paying for it.
Fred V
'77 Royale RB 455
P'cola, Fl
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