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Old 02-02-2009, 08:12 PM   #16
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Resource for understanding gas valve?


Quote:
I'm not sure where your previous post is. If you copy and paste it in here, I'll take a look at it and see if I can help solve your problems.
How to check gas control valve?

Quote:
I know lots of things that are older than 24 years.
Besides you and me???

I checked with a local parts distributor a few days ago as you suggested, but unfortunately they tell me that this Modine furnace is obsolete, no parts info available. I gave them all info as far as model, ser#, other codes on the label.

For the gas valve itself, I have taken it off and there is absolutely no info stamped into the body. "Honeywell","Gardena, California", a couple of die marks, "1/2 psi (?)" is all that is there. There is a label that has long since faded and which I presume had the necessary info on it.

The connector terminals are somewhat rusty and after cleaning them as best I could, I managed to get intermittent voltage at both black valve terminals. If I wiggle the terminal at the TR connection, I can hear the valve try to open but I have to keep my finger on it. At least for a couple of times, but now it doesn't even do that.

Quote:
and download the original documentation that came with that gas valve. That will tell you the correct way to wire that valve (with or without safety controls on the 24 VAC side).

Ditto for the furnace. You should be able to download the documentation that came with that furnace, and it will include a "ladder diagram" telling you how the start up sequence is supposed to work on that furnace. (That will include all the 120 and 24 VAC loops and what relays turn on which loops in order to get 24 VAC to the main solenoid of the gas valve.)
Ergo my delimna, no schematics to follow and limited knowledge of what is supposed to be where.

Backup plan: I have two other heaters that I can replace this one with.

darsunt-
My apology for hijacking your thread.

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Old 02-02-2009, 11:38 PM   #17
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Resource for understanding gas valve?


Downunder:

I read your previous post, and if you're only intermittently getting 24 VAC to the gas valve, then I'd expect that one of the safety controls in your heater is either intermittently stopping power from getting to the gas valve, or the transformer isn't working properly.

I know Modine makes car radiators, so I thought that maybe the company closed it's gas fired boiler operations, but apparantly I was wrong.

This web page shows that Modine is still building gas fired heating units:

http://www3.modine.com/v2portal/page...anding_003.htm

One of the free downloads on that site is entitled "Service Diagnosis Guide for Modine Gas Fired Unit Heaters". That seems to be the pot of gold you're looking for. Even if the types of heaters discussed in that booklet are different than yours, the ladder diagrams SHOULD be similar to yours. That's because their idea of the "best way" to start up a boiler would have been used through all the different models of boilers they made.

I'd start by downloading that guide and seeing if it's relevant to your heater.

I'd also look in your local white pages phone book and see if there's a Honeywell office in your area. Take some pictures of your gas valve and see if anyone in that office can identify it.

Hang on, I'm going to look through that Modine service booklet and see if the unit heaters they discuss look like yours.
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Old 02-02-2009, 11:49 PM   #18
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Resource for understanding gas valve?


That Unit Heater Diagnosis booklet doesn't have any wiring or ladder diagrams in it. It just consists of standard things to check for specific conditions.

However, it does talk about a "burner motor" which may run but not produce a spark to ignite the gas. They also talk about a fuse and a reset switch.

Modine does maintain a tech support phone number for help on it's heating systems. Go to:

http://www.modine.com/techsupport/

On the right side, under the picture of their manufacturing facility in Racine, Wisconsin is a "Questions, Comments and Feedback" linke. I'd e-mail those people some pictures of your greenhouse heater and see if they can identify the model. (IT doesn't have to be exactly the right model. All the models similar to your heater built about the same time as your heater will have pretty similar wiring and ladder diagrams.) See if they can identify your heater, and ask if they can send you or e-mail you the original documentation that came with that heater, espcially the wiring and ladder diagrams.

And, check to see if there's a Honeywell office near you and see if they can visually identify that gas valve. If not, e-mail some pictures of it to:
https://www51.honeywell.com/honeywel...ombustion.html

If it's a Honeywell gas valve, someone at Honeywell should remember it.
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Last edited by Nestor_Kelebay; 02-03-2009 at 12:03 AM.
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Old 02-03-2009, 08:44 PM   #19
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Resource for understanding gas valve?


"Clean and tight" my daddy used to say as a mechanic. Anything that needed a gasket, clamp, or connection. In recent years I have heard the philosophy of KISS- Keep It Simple Stupid!

Final solution- rusty connection on the call for heat circuit at the terminal from the transformer to the lead going in to the valve. A little emory cloth....

Our "walks on water" shop mechanic disassembled the supply plumbing, took the valve out and took it most of the way apart, put it all back together, lit the pilot and declared it healed! I asked if he wanted to actually turn it on (call from stat) and see if it worked. I did that and told him that only the pilot was on but no heat. He found something else to work on so I had to start this saga from scratch. It's a little hard to see up a dark hole with bifocals, behind a heater, no head room, and the glare of the sun in one's eyes. Remember, this is in a greenhouse. So I got a flashlight-in the bright sun- and discovered the rust. Tried to clean it with some WD40 and scraping it with a pocketknife blade. Finally took it off so I could get it on a bench. Unable to find any model info but did find a faded out decal on the side. I'm beginning to ramble. After a good cleaning, I connected the source current, kicked up the stat for a call, and played morse code with the valve by touching the ground to complete the circuit. Put it all back together, turned the stat up, VIOLA! Hit it four times over the next couple of hours and it's still working.

Clean and tight!
Dedicated to the best troubleshooter I have ever known.
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Old 02-04-2009, 12:08 AM   #20
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Resource for understanding gas valve?


Glad to see that the heating unit is working.

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