Author Topic: Converting to natural gas/RobertShaw Unitrol 7000-BER-1/403-501-729  (Read 7470 times)

Offline Jerry64

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We are going to natural gas from LP and would appreciate and help to find out what kit we need to change the furnace over.........New man on board so please be gentle....... :) Thanks JerryB.

Offline jumptrout51

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #1 on: July 26, 2010, 07:16:09 PM »
Natural gas utilizes a larger orifice than LP.
The orifices will have to be changed also.
There should be an orifice size designation printed on the furnace.
If not,the furnace manufacturer will provide the info.
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Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #2 on: July 26, 2010, 07:42:31 PM »
Looked on furnace label and no orfice size on it.It is a 125,000 BTU but I would like to lower it to 85-90K BTU if possible.......Thanks,JerryB. :-\

Offline JWWebster

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #3 on: July 26, 2010, 08:00:17 PM »
Post pictures of the unit
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Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #4 on: July 26, 2010, 08:16:39 PM »




Offline jumptrout51

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #5 on: July 26, 2010, 08:34:50 PM »
Who is the furnace manufacturer?
Model Number?
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Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #6 on: July 26, 2010, 08:41:14 PM »
CHJ-125-D4 is the Model# and Tag says "Manufactured for Heat Controllers of Jackson,Mi.......JerryB.

Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #7 on: July 26, 2010, 08:56:48 PM »
The site shows they deal in Comfort-Aire products......JerryB.

Offline JWWebster

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #8 on: July 26, 2010, 09:42:24 PM »
You gonna have to go 10 orifice bits smaller than the size of the orifices are now. That means plugging and re-drilling each orifice. The pilot assembly needs to be changed to LP and the gas valve needs to have that plate removed with the red screw and a flat plate reinstalled on there. Nothing to it. See the picture? (click to slightly enlarge) that is a nat gas reg. It has to be removed from that valve and a flat plate put in its place. I have some of them in my Robertshaw stuff. (retired Robertshaw distributer)
« Last Edit: July 26, 2010, 09:51:13 PM by JWWebster »
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Offline JWWebster

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #9 on: July 26, 2010, 09:47:54 PM »
That is a 24 volt, half" in half" out Robertshaw natural gas valve. The blue wires coming out from under the safety thermocouple go to a limit.
May the hinges of our friendship
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About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline JWWebster

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #10 on: July 26, 2010, 09:57:21 PM »
I noticed you aint got no tape on the nipple. If air or humidity gets into that valve it won't be worth a dayum. Duct tape that valve or lose it.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #11 on: July 27, 2010, 07:27:07 AM »
The furnace was converted from NG to LP when it was installed 29 years ago.Now I need to re-convert it back to NG and the furnace guy is long gone.:)....JB

Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #12 on: July 27, 2010, 07:35:10 AM »
It has a 3 burner tube and the tips are 49's now with LP.......JB.

Offline JWWebster

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #13 on: July 27, 2010, 08:09:38 AM »
The only thing to do is install a 3.5 reg as shown above. Open all orifices 10 sizes bigger and change the pilot light to a nat gas one. Plenty of furnace men are still around. Check with your local nat gas supplier.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline Jerry64

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Re: Converting to natural gas/RobertShaw Unitrol
« Reply #14 on: July 27, 2010, 08:32:33 AM »
Thanks for all the info JW......much appreciated.I can do the work on it..Just need a little guidance.......... O0 O0 O0.....JerryB.

 

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