- This topic has 3 replies, 4 voices, and was last updated 21 years, 3 months ago by
NOS Plumbing and Heating</titl.
-
Posts
-
-
MasterPlumbers
hi all,
installing a new thermostat (LUX 500) and I’ve only got 2 wires from the old thermo…I hook them up and get the furnace to fire and blow hot, but I don’t seem to have any control over it. I crank the heat and it blows hot but then I lower it to 15 degrees, but it still blows HOT air? wazup with that?cheers,
marc -
Still blows hot air after the thermostat has closed off??? You sure you are not just getting the residual heat from when the burner was firing up. You may have a lowering setting on your system as well – it would help some if you were to tell all of us poor Plumber fellas what exactly you have there – after all we are not mindreaders although a lot of our customers think we are!
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians -
It sounds like your thermostat is telling the furnace to provide heat no matter what you set the dial to. You need to remember that the thermostat is basically an on-off switch that opens or closes depending on the ambient temperature (at the thermostat). The kind of problem you describe is due to one of two things: 1) the thermostat is faulty; or 2) the gas regulator at the furnace is faulty. There is a third possibility, that the wiring between the thermostat and the rgulator is shorted, but that’s unlikely and easily checked with an ohm-meter.
You need to tell us whether your regulator uses a millivolt thermopile or low voltage current through a transformer. This gets a bit complicated for the layperson. I could suggest a few procedures to fix your problem, but at this point I recommend that you have a licensed HVAC professional check out your particular system. It shouldn’t cost you much.
NtP
-
do you have a coelman furnace b/c they use a scrud up sistem, it involved about 10 different parts thru out the furnace that it does not need
is it a other traler house furnaces are like that and some houses to.
make sure your therm is a heat only thermistat.
do you have cental air, using the furnace blower???
you could test your new therm with a Ohm meter.
reply with answered ?’s and we can help u more.
-
- You must be logged in to reply to this topic.
