| 78 Royal Hot Water Heater Control Board [message #278032] |
Tue, 19 May 2015 10:01  |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Need a model number for a 78 Royal Hot water heater. Believe the control board is
bad but cannot find and any nomenclature on the unit. One of the paper instruction
sheets is so weathered that it is impossible to read. I was given an Atwood #962692
but PPL (RV parts house)could not find that number.
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: 78 Royal Hot Water Heater Control Board [message #278061 is a reply to message #278032] |
Tue, 19 May 2015 21:02  |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Senior Member |
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Bruce, I will try to check the model and numbers on mine tomorrow. I have not been able to figure out exactly how mine works. Mine is a pilot light model but I understand there were also electronic ignition models. If I manually light my plot light and set the control to on the heater operates fine. I'm just not sure what the switch under the sink does? Maybe it just keeps it from turning on? The wires are there but not connected to the switch. I will have to study the wiring diagram and try to figure it out.
Is yours a pilot light or electronic ignition?
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: [GMCnet] 78 Royal Hot Water Heater Control Board [message #278071 is a reply to message #278061] |
Wed, 20 May 2015 04:23 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Willies, is also a pilot light. The switch under the sink starts the heater
up.
How do set the control to on?
Thanks Steve
On Tue, May 19, 2015 at 8:02 PM, Steve Adams wrote:
> Bruce, I will try to check the model and numbers on mine tomorrow. I
> have not been able to figure out exactly how mine works. Mine is a pilot
> light
> model but I understand there were also electronic ignition models. If I
> manually light my plot light and set the control to on the heater operates
> fine. I'm just not sure what the switch under the sink does? Maybe it
> just keeps it from turning on? The wires are there but not connected to the
> switch. I will have to study the wiring diagram and try to figure it out.
>
> Is yours a pilot light or electronic ignition?
> --
> 1978 GMC Royal
> Eastern Pennslyvania
> 1968 Chevrolet C20 396 Camper Special
> 1969 Chevrolet C20 Camper Special
> 1985 Buick Electra Park Avenue
> 1992 Camaro 25th Anniversary Heretage Edition Black
>
> _______________________________________________
> GMCnet mailing list
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>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] 78 Royal Hot Water Heater Control Board [message #278107 is a reply to message #278086] |
Wed, 20 May 2015 21:11 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Thanks Wayne,
I have no idea what water heater is in my friends coach. I checked with
another GMCer with a Royal and his looked like the one in the documents.
My friends circuit board has what looks like a transformer on it and is
open on the sides I would guess would be for air flow.
On Wed, May 20, 2015 at 12:59 PM, Wayne Rogewski wrote:
> This document was helpful to me in figuring out the heater in our 77 Royale
>
> http://beamalarm.com/Documents/atwood_water_heater_troubleshooting.html
>
>
> For what its worth, the switch usually under the sink in a Royale, when
> switched On tells the unit to ignite or Turn on. If there is no ignition
> after I think 3 attempts the light next to the switch should light up,
> indicating failed ignition.
>
>
> --
> 77 Royale
> Mid Michigan
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: 78 Royal Hot Water Heater Control Board [message #278171 is a reply to message #278032] |
Thu, 21 May 2015 20:07 |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Senior Member |
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Bruce,
I took a picture of my water heater but can't seem to upload pictures right now. Mine is definitely pilot light and I don't see or recall any circuit board controls. There are only two controls on the outside, first a round blue knob on the gas valve that can be set to off, on, or pilot, second a sliding lever where you can adjust the heat. That lever is on top of the gas control valve.
After reading and watching some Utube videos, it seems that the electric switch inside the coach is not really for true ignition on this model but just provides or cuts the 12 volt power to the water heater. I am going to try to re-wire the switch this weekend. My wires are currently all just connected together, essentially just bypassing the switch. The heater works fine without the switch. Once the pilot is lit it will come on automatically and bring the water up to temperature and then shut off. After I ran the hot water for a little bit it kicked back in until the water was back up to temperature. This also leads me to believe that the switch inside only prevents the heater from coming on.
I could be wrong but that is how mine seems to function. Functions exactly like the water heater in my 1968 truck camper (no electric switch or circuit board, just old school propane pilot light and controls)
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: [GMCnet] 78 Royal Hot Water Heater Control Board [message #278194 is a reply to message #278171] |
Fri, 22 May 2015 08:45 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Steve,
Thanks for checking, yours sounds totally different than the one in my
friends.
On Thu, May 21, 2015 at 7:07 PM, Steve Adams wrote:
> Bruce,
> I took a picture of my water heater but can't seem to upload pictures
> right now. Mine is definitely pilot light and I don't see or recall any
> circuit
> board controls. There are only two controls on the outside, first a round
> blue knob on the gas valve that can be set to off, on, or pilot, second a
> sliding lever where you can adjust the heat. That lever is on top of the
> gas control valve.
>
> After reading and watching some Utube videos, it seems that the electric
> switch inside the coach is not really for true ignition on this model but
> just provides or cuts the 12 volt power to the water heater. I am going
> to try to re-wire the switch this weekend. My wires are currently all just
> connected together, essentially just bypassing the switch. The heater
> works fine without the switch. Once the pilot is lit it will come on
> automatically and bring the water up to temperature and then shut off.
> After I ran the hot water for a little bit it kicked back in until the water
> was back up to temperature. This also leads me to believe that the switch
> inside only prevents the heater from coming on.
>
> I could be wrong but that is how mine seems to function. Functions
> exactly like the water heater in my 1968 truck camper (no electric switch or
> circuit board, just old school propane pilot light and controls)
>
>
> --
> 1978 GMC Royal
> Eastern Pennslyvania
> 1968 Chevrolet C20 396 Camper Special
> 1969 Chevrolet C20 Camper Special
> 1985 Buick Electra Park Avenue
> 1992 Camaro 25th Anniversary Heretage Edition Black
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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