Condensing furnace not condensing??

01-02-2013, 04:29 PM	#1
mlijoi Member   Join Date: May 2012 Location: Southern Ontario, Canada Posts: 64	Condensing furnace not condensing?? Hello all and a Happy 2013 to all. My question is a simple one. My early 2000's Lennox Merit 90UGF doesn't seem to be producing any water out of it's condesate drain. No other wate leaks in furnace bay. Is this normal? And yes the drain line is clear and properly routed too.

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01-02-2013, 06:40 PM	#2
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,656	Condensing furnace not condensing?? Check air filter.

01-02-2013, 06:49 PM	#3
mlijoi Member   Join Date: May 2012 Location: Southern Ontario, Canada Posts: 64	Condensing furnace not condensing?? It's clean, just some dust buildup

01-02-2013, 08:31 PM	#4
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,656	Condensing furnace not condensing?? Too ow of air flow, over over firing can cause no condensate.

01-02-2013, 08:41 PM	#5
carmon Member   Join Date: May 2010 Location: winnipeg manitoba canada Posts: 691	Condensing furnace not condensing?? it can indeed......

01-03-2013, 04:02 PM	#6
mlijoi Member   Join Date: May 2012 Location: Southern Ontario, Canada Posts: 64	Condensing furnace not condensing?? Ok, that makes sense. I had a gas man come last year and he made an adjustment with a really old manometer (not digital) and he bumped up the pressue a 1/4 turn so now it's probably over firing. Which way turning the screw reduces pressure?

01-03-2013, 07:12 PM	#7
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,656	Condensing furnace not condensing?? Should only be adjusted using a manometer. I still have a couple old ones. And they work as well as any of my newer ones. Don't assume its over fired. check it with a manometer, or have someone check it. under firing is as bad as over firing.

01-03-2013, 07:38 PM	#8
mlijoi Member   Join Date: May 2012 Location: Southern Ontario, Canada Posts: 64	Condensing furnace not condensing?? Ok thanks, im going to do a meter clocking asap.