Lennox Pulse Furnace

JK_2

I want to learn how to do proper maintenace on a Lennox Pulse heater. If anyone can go over the steps or tell me how to get the Lennox's maintenace procedures I would greatly appreciate it. Also, is the inducer motor on the Pulse heater noisy?

Unknown

I have a complete

service manual on the G-14 Model and the G-21/GSR21 Model. If you e-mail me your postal address I will send you a copy of each.

Dale

Pulse

Probably the best warm air 90 plus furnace ever made, certainly the most long lived, unfortunately too well made and too costly to produce so now it's not made anymore. The only real maintenance item on the pulse is the air flapper which should be changed every 5 years. Gas pressure is a big deal as most pulses run at 2 inches water column instead of the normal 3.5, the nameplate will tell you the pressure. The inducer motor lasts forever since it only runs on prepurge and post purge and it's really inexpensive if it does fail. Pulses do have a bit more noise, alot more if installed badly. I miss them.

c-rex

the lennox

pulse furnace also has some ( 4 ) heat exchanger mounts that require periodic changing. They sag a little and the units start to knock. They are a bit of a stinker to change out, but using the shipping bolts and a small sheet metal plate, they can be done in an hour or so. Give me a shout if you need help. I also agree, this was the finest unit lennox ever produced, I to shall miss them. C-REX

D lux_2

do you want mine ?

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Unknown

They sure did not work very well

here in RI. We had nothing but problems with them.

Floyd_5

When I started in the business....

I worked for a Co. that sold Lennox....didn't know that there were furnaces out there that didn't need constant attention till... I went on my own and started checking out reliability of other brands....
there are some brands that stand head and shoulders above the rest!!!!
Wouldn't wish a Pulse on my worst enemy, a royal PITA!!!!
Just try and get that damn spark plug out, or change the darned gas flapper assem. after wet gas has that SOB rusted in there.
Oh, and leave the fancy stuff at home when you go to work on it, just fiddle fart around with the thing till you get it working... kinda like I used to do with the 69 Nova engine...whne you could just hear it ping a little when you stomped on it hard then the timing was "just right", have to set them up by how they "sound"... after awhile you could tell if they were "purring" just right...
Oh, and wasn't this the furnace that the dealers had to go around and check every HX because most of them cracked????
No wonder they aren't made any more.....

RC

Not a big fan of the pulse

I'm not a fan of them either. We have 3 that we still service. What a pain in the **** to work on!

Dale

1981

As you can see by the posts some techs like the pulse and some don't. The pulse came out in 1981 and there are thousands from the early 80's that are still running with nothing changed except for maybe a 30 cent yes air flapper. Instead of a $200 inducer motor like the early Heils the pulse is $13. Sure there are good 90 plus models out now but see if anyone posts of a great 90 plus furnace brand from the 80's, ask about the 87% Arlka or the Amana HTM or how many spark pilots or inducers the earlier Carrier product had replaced. NOTHING from the early days of condensing furnace technogy is still running without major parts replacement except the pulse. People don't like the pulse because you can't see the flame, true but if you really understand how they work a microamp or CO2 reading will tell you all you need to know about combustion. Getting the plug or flame sensor out of an old one is hard and a special wrench helps alot but that is the IMO only difficult service point. 90 percent of the pulses were sold in only 4 states, Minn, Iowa, ILL and Wisc. so the techs who installed alot of them got good at it and the service people got alot of good factory training.

Kevin_12

Pulse Furnaces

I've serviced quite a few. You have to clean the air flapper once a year and you have to cut the flue trap and clean it out. Then couple it back together with a 1 1/2 inch coupling, rubber ones ok. Cut it very close to the bottom. You will be cutting a 1/2 inch cpvc pipe inside trap. its ok to shorten the cpvc a inch or two. If its a downflow their is a removable floating ball. Be sure its not full of water. The heat exchanger should be pressure checked with 6# of nitrogen, requiring a kit, to be sure its sound. The secondary heat exchanger is the most typical place to go bad. If you open up the inspection port to see the heat exchanger and you see green substance around the fittings, the heat exchanger is probably bad.

Jim_5

I've worked and installed pulses from the very beginning. I'd rather work on ten of them in a row as any other high eff. furnace. They intimidate amateur service techs and some so called pros. Yeah I know heat exchanger problems. But they took care of that( And did it free) and the pulse 21 model which was the last series made will most likely run forever. I have a pulse in my shop and two at home.

Kevin_12

Hey jbben

I've found lots of G21 pulse heat exchangers bad 1991's 92's and 93's. I pressure checked two twinned together the other day and they both leaked slightly but never lost all my nitrogen pressure. I put 7# in both and one leaked to 5 after 10 minutes and the other one 6 after 10 minutes. I work at a place that is one of the largest Lennox dealers in the midwest, Indianapolis to be exact. I see 2-4 Pulse furnace a week generally. They tell us that the chambers are no longer availble and Lennox gives them a new furnace but the customer has to pay for labor and any additioal material. This runs the customer about $1200.00

Boiler Guy

The Pulse

We had lots of them out here in western Canada. Unfortunately the US/CDN exchange rate kinda killed a lot more sales. As mentioned by others on here -- poor installation practices gave them another black eye. I still service 35 or 40 a year but they are now starting to get tired. So far I haven't found anything to replace them with which can boast the equivalent the fuel savings.

Kevin_12

Steve/Canada

I'm not sure the eff. rating of a new Pulse, which has got to loose some eff. since its a few years old, but surely a new 90%+ 2 pipe furnace is got to be close, if not better. Lennox, Trane, Carrier, Bryant... Alot of manufactures make a 2 pipe furnace.

MikeB34

Check Olsen/Airco GTH...95% out of the box and sweet to work on.