Dave,
http://www.freepoolheat.com/gassystem.html#millivolt

Jabs


"DaveC" wrote in message
al.net...
Have a 50-year-old (?) natural gas wall heater in my apartment. Thermostat
is
connected to gas valve in heater by 2 wires. No evidence of transformer or
low voltage (ie, 30 vac) on the wires.

Symptom is that the 'stat won't open the valve. If I short the terminals
for
just a second, the valve opens, and shuts at the appropriate temperature.
(I
since have read that it's not a good idea to short those terminals
together;
it could damage the valve, or some other component.)

What replacement thermostat should I be looking for? All I see are
multi-wire
types that require a transformer voltage. Will any mercury-bulb type work?
(That's what the old one was.)

I'm also curious where the voltage comes from to operate the valve. Is
this
generated by the thermocouple / sensor next to the pilot flame?

Suggestions welcome.

Thanks,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC

This is an invalid return address
Please reply in the news group