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chandler001 11-06-2011 01:28 PM

a call for heat:
 
my comfortmaker smart valve will not allow inducer to come on changed 2 valves

Doc Holliday 11-06-2011 01:36 PM

Where does the inducer wire into? Usually it's to the control board. The inducer coming on, if I'm not mistaken, has absolutely nothing to do with the gas valve allowing it.

Doc Holliday 11-06-2011 01:41 PM

Do you have an electrical testing meter, preferrably digital?

chandler001 11-06-2011 02:13 PM

call for heat
 
have digital meter. call for heat ,sends power to board on valve, sends power to inducer relay, inducer does not come on

Doc Holliday 11-06-2011 04:09 PM

Turn breaker to furnace off. Remove inducer wires from board. Connect main furnace power directly to inducer, hot and the neutral, using wire nuts. Remember that if you have to cut the spade terminals on the inducer wires off leave a few inches of wire on those terminals so you can wire nut the terminals back to the inducer wires and plug it back in, unless you have extra spade terminals.

Turn power back on to furnace. If inducer does not start hard wired than it's no good.

beenthere 11-06-2011 04:28 PM

maybe its the inducer that is bad, and not the valves.

Doc Holliday 11-06-2011 04:47 PM

Bt, does the gas valve send power to the inducer on any furnace? Maybe in my limited two years on the service side, 9 or 10 years install prior, I haven't come across that yet but what I have seen 100% of the time is the board sending power to the inducer, the board being where the inducer plugs in to.


Like in the pics I posted a few days ago.

beenthere 11-06-2011 04:48 PM

Some smart gas valves do.

Doc Holliday 11-06-2011 04:53 PM

On these certain smart valves do you send the 120 volts only to the valve which then sends high voltage to board for cool or heat terminals or does the board also get it's own hot?

beenthere 11-06-2011 05:01 PM

Doesn't really have a control board. Uses a fan timer to control the fan. the smart valve controls inducer, pilot/ignition system, and all safeties run through it.

Doc Holliday 11-06-2011 05:04 PM

Seeing as how everyone refers to these Smart Valves as "Dumb Valves", is it feasible to ask can you replace the valve with a non smart valve and put in a board?

Doc Holliday 11-06-2011 05:07 PM

I may have come across that yesterday on an old Snyder-General gas furnace, like the old Consolidated. Only a transformer, relay and gas valve with control strip on outside of small control box lid. No board.

Also was like that on an old American Standard two days ago..?

yuri 11-06-2011 05:09 PM

No. The 2nd generation of Smart Valve controls the inducer.

http://customer.honeywell.com/honeyw...px/SV9541Q2561

Check out the literature for it on their site and bookmark that site. TONS of useful info about Honeywell controls there.

beenthere 11-06-2011 05:14 PM

Trying to convert to a different gas valve would be taking the furnace outside of its UL approval listing.

The SV isn't on old equipment. Depending what you call old.

Doc Holliday 11-06-2011 05:33 PM

But it could be done is what I'm getting at, right? I don't know what kind of gas valve this American Standard has but it has a control strip, a transformer and a regular fan relay and that's it, no board.

http://i87.photobucket.com/albums/k1...g?t=1320437514


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