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Comfortmaker furnace G-U 400100 -12m need wiring help

G-U 400100 -12m robertshaw unitrol 7000 ber

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14 replies to this topic

#1 chineena

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Posted 24 September 2011 - 12:18 PM

Greetings;

I replaced the old Robertshaw Unitrol 7000 BER-1 24 volt gas valve with a White Rogers 36C03-333 and the relay terminals are different. The furnace wiring diagram is nowhere to be found. Can't seem to figure out how to connect the 2 black and 2 tan/white leads to the new valve.

Obviously, any help would be appreciated. I can post pics if needed.

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#2 Dan Webster

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Posted 24 September 2011 - 04:27 PM

Post some photos
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#3 chineena

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Posted 25 September 2011 - 01:45 PM

Sorry for the delay. Preparing for visitors.

I'm referring to the 2 black leads coming from the thermostat and the 2 marked with arrows (may not be on the correct screws) from the 24v power supply. All 4 of these were connected to the old gas valve. The black were piggy-backed but I separated them. I've attached a diagram that I made minus the 4 leads in question.

I'm referring to the 2 black leads coming from the limit switch - sorry.

Attached Files



#4 RegUS_PatOff

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Posted 25 September 2011 - 04:21 PM

White Rodgers Gas Valve 36C03.pdf
.

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#5 chineena

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Posted 25 September 2011 - 08:00 PM

Thanks (I think) for the pdf but I can't install the executable on my Mac.

#6 chineena

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Posted 25 September 2011 - 08:19 PM

Dummy me, I clicked on the big download button which I guess was an ad.

I actually have that manual. Still befuddled.

#7 Dan Webster

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Posted 26 September 2011 - 03:15 AM

Post a photo of your valve. I think you might have the wrong one. The terminals should have been the same.

Edited by applianceman18007260692, 26 September 2011 - 03:16 AM.

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#8 RegUS_PatOff

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Posted 26 September 2011 - 09:11 AM

can you draw a diagram on how the "old" Valve was connected ?
.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
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#9 chineena

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Posted 26 September 2011 - 12:23 PM

More photos.

This furnace was installed in '85 so it's old. The Robertson Unitrol gas valve only had 2 terminals so the connections were simple. One black and the white to one terminal and the other black and the tan to the other terminal.

Attached Files



#10 chineena

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Posted 28 September 2011 - 01:51 AM

Nobody knows the trouble I've seen...

#11 RegUS_PatOff

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Posted 28 September 2011 - 02:24 AM

can you draw a diagram on how the "old" Valve was connected ?

... into your hand drawn wiring diagram ?
.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#12 chineena

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Posted 28 September 2011 - 03:05 PM

Here's the schematic with the old gas valve connected.

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#13 RegUS_PatOff

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Posted 28 September 2011 - 07:09 PM

use terminal TH and terminal TR
TH-TR is a spare terminal for other connections if needed
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one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#14 Dan Webster

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Posted 28 September 2011 - 09:06 PM

One of them terminals don't do a thang like reg says. You won't get a reading between the dummy terminal and the other 2. So your 24 volts is goin to go between the 2 terminals that you get a reading from. Just in case you come across this again. Since you mentioned you had 3 terminals I wanted to be sure you didn't have a millivolt valve instead of a 24 volt valves. These valve come in a variety of different power ranges from line voltage ac to low voltage ac to millivolt.
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#15 chineena

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Posted 28 September 2011 - 10:48 PM

Excellent. You verified my suspicions. The middle terminal does nothing.

Thank you gentlemen.

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