I have a 1961 Gaffers and Sattler furnace, model #90 FEF. The gas valve was not hooked up when we bought the home. The gas company was called and I was told that the gas valve needed to be replaced. I replaced it with a Robertshaw 7000 ERLC gas Valve. I also replaced the transformer. It has a 24V transformer plugged into a 110 wall receptacle. The transformer has 2 leads marked 24 Volt and 50VA. I also replaced the Thermocoupler.

So far so good. The furnace turns on and works very well. Lots of heat. Here is the problem, It will not shut off. I ended up replacing the Thermostat twice and still no luck. To shut the unit down I have to turn the gas valve from on to Pilot.

My question is did I wire it together incorrectly. I had nothing to go off because the old system was not in working order or attatched. On the Robertshaw Gas valve is a terminal that has two connections marked TR and TH. Those are on top of the valve facing toward the incoming gas. There are two additional connectors also marked TR and TH coming off that same terminal facing the outgoing gas. The connectors look as though they are connected, meaning that both TR or TH connections are tied together.

Here is what I did. From the transformer I connected the 24V directly to the TR connection and the 50VA to the TH connection. From the Thermostat I connected one wire to the TH and the other wire to the TR. If that is incorect let me know.

The wires leading to the thermostat are also a problem. On the thermostats that I found they don't have a TR or TH connection. Where do those wires connect to? Everything I found wants me to follow a system that has me attatching the red wire here and the yellow wire there. I only have the 2 wires and they are both the same color.

Is there a wiring diagram anywhere on the unit? If not, I think you need to call in a pro to hook up the unit correctly. If you have both 24v leads hooked directly to the gas valve, the gas valve is getting 24v all the time, so it won't shut off. The power from the transformer need to run through the thermostat and any high limit devices before it hooks to the gas valve. The way you have it wired right now is very unsafe. Without being there to actually see what other limit devices etc are on the unit, it would be near impossible tell you exactly how to wire it. If you find a wiring diagram, it should show you exactly how to wire it. Good luck and please let us know how things work out.

What did he end up with?