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Thread: First Lenox Pulse 21 Gas Furnace
12-18-2012, 08:59 AM #27
The proper way is a pressure test. You could actually make one. All you have to do is pull the Air diaphragm and put a plug in the hole, then pull exhaust at furnace and plug it. The only thing you need is the gas flapper because you have to attach a 12" long nipple to it and put a gauge and shredder valve on. Pretty simple plugs range from 3/4" to 1 1/8"
12-18-2012, 10:10 AM #28
I actually have a brand new pulse heat exchanger in the crate in my basement. This reminded me I need to throw it in the scrap bin.
12-18-2012, 10:28 AM #29
12-18-2012, 10:33 AM #30
12-18-2012, 08:50 PM #31
12-18-2012, 09:33 PM #32
I have to pull a pulse out Tomorrow and I'm not looking forward to it, there so damn heavy!
12-19-2012, 09:59 AM #33Regular Guest
- Join Date
- Dec 2003
The pulse furnace is pretty much obsolete. Lennox no longer supports most parts. The ignition control has always been a problem and there is an after market replacement avaiable from Johnstone Supply. I hav used 1 sofar and it has worked. Time will tell if it last better than the original. The air flapper diaphram should be replaced yearly. Also some of the older units had a plastic assembly for the diaphram and the threads where it screws unto the furnace would fail allowing the assembly to fall off preventing the furnace from fireing. Be carefull with the spark plug they are not easy to access and break easily if you don't have the socket on straight. Check your condensate drains and the termination of the flue pipe for obstructions. Good luck.
PS: your customer would be best served by reccommending the furnace be replaced as they did have heat exchanger problems and should be pressure tested every 4 years.