Thermac Regulator

gregsimon

Hello all.

I have a very old Lennox gas furnace and the regulator has stopped allowing gas in. It allows just enough for the pilot to stay lit, but when the unit calls for heat the pilot goes out.

I figured it shouldn't be too hard to replace a regulator, but apparently because of the age, I am having difficulty getting information on the old regulator. So I know what to replace it with.

All the regulator has inscribed on it is Thermac Co. and what appears to be a HM and T11-

Also stamped on it is 4-59.

I have typed all of this in various forms into google search but have had no luck.

Any chance someone here knows what this regulator could be replaced with?

Jamie Hall

That 4-59 may be a date code. In which case, that puppy has served its time... may be time for a whole new furnace?

delta T

I sincerely doubt that you will find a replacement regulator....most standing pilot gas valves are now what are called combination valves, that have a regulator built in. If that 4-59 is a date code, I would be wary of the furnace itself, do you know if the heat exchanger is still good? do you have any CO alarms in the house?

Can you post a picture?

gregsimon

So couldn't I just remove the regulator and replace the old gas valve with a combination valve which has a built in regulator?

Jamie Hall

gregsimon said:

So couldn't I just remove the regulator and replace the old gas valve with a combination valve which has a built in regulator?

Probably. With some fiddling. Keep in mind, however, if you do that you have just built your very own experimental, unapproved gas boiler, and if anything goes wrong with it you own it -- and if it goes really wrong, your insurance company won't touch it with a barge pole.

gregsimon

So that doesn't sound like a good idea.

And what you guys seem to be saying is they do not make stand alone regulators that would work?

EBEBRATT-Ed

No one can make much of a guess without seeing it. Post a few pictures and someone can give you some decent advise

gregsimon

JUGHNE

That is not the original gas valve for that furnace.
It may or may not need the regulator before it.

You have to know what the house gas pressure is.
And if it is natural gas or LP.

What is on the floor under the furnace??
Has the unit been cleaned and inspected recently? It could be time.
I think you need to call someone in to resolve all these problems.

Steamhead

What @JUGHNE said.

Time to call a pro. Where are you located? Have you tried the Find a Contractor page of this site.

HVACNUT

Give yourself a new furnace for a personal holiday present.
I wouldn't spend a nickel on repairing something that old.