Furnace question
Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: Off Topic
Forum Discription: Anything non-Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=35248
Printed Date: January-22-2025 at 10:00am
Topic: Furnace question
Posted By: Gary S
Subject: Furnace question
Date Posted: January-07-2015 at 3:16pm
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We have a very diverse base here so I thought I'd ask. I have a Lennox LF24-50A-1 a hanging mount natural gas furnace in my garage. It seems to be cycling alot meaning it starts up runs and heats then the burners shut off,the blower keeps going then after a few minutes the burners start up again for a few minutes and shut off again. This keeps repeating until the garage finally warms up. When it's this cold it never catches up. I have replaced the flame sensor with no change. I feel that it is a sensor but am out of ideas. It is a 85% model? I think, with an exhaust blower. Any ideas? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Replies:
Posted By: phatsat67
Date Posted: January-07-2015 at 3:18pm
Bummer Gary, I will come take it off your hands so you don't have to take it to the dump yourself  ------------- |
Posted By: Gary S
Date Posted: January-07-2015 at 3:42pm
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Thanks Zach, better hurry up I have about had it here,it's 80 at the other place with a boat hanging on davits just waiting! I have to call you and get going on that bow cover,I'll give you a ring tommorow if thats ok. Just sat here and baby sat it,the burners ran for 1m 15s than shut off for 30s than started for 1m 11s,off for 45s on 1m 52s off 38s then started for 17s then off for 30s than started again 1m 20s ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: January-07-2015 at 3:57pm
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Gary, Check the high limit control. Get the volt meter out and trace to confirm. Is there enough air moving through the unit? Remember what I am always saying about testing first before becoming a "parts changer"?  An IR temp meter would be useful to check the temp directly next to the limit to see if it's good or not.------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Orlando76
Date Posted: January-07-2015 at 4:00pm
| Did you check the thermostat or bad/dirty flame sensor? |
Posted By: phatsat67
Date Posted: January-07-2015 at 4:22pm
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We have an old in our north heated building. It always fires right up but blows out Luke warm air. I need to get up there and investigate further. I feel the excess amount of dust and such from the previous owner may be preventing proper transfer of heat to the air passing by. Call me tomorrow sir. Outside of that I know basically nothing about furnaces and can't help although I am willing to learn. ------------- |
Posted By: peter1234
Date Posted: January-07-2015 at 4:39pm
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Fan and limit i'd bet prepurge -flame-blower-then cold blown air? ------------- former skylark owner now a formula but I cant let this place go |
Posted By: JoeinNY
Date Posted: January-07-2015 at 4:40pm
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What's the control board flashing at you? You don't happen to have it blowing directly on the thermostat do you? The flame proving switch should lock out after a few failures for an hour or so, so if it is actually starting up each time and just short cycling that shouldn't be the issue. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: tullfooter
Date Posted: January-07-2015 at 5:43pm
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I'm not familiar with that unit, but if it has a fan control switch, which I assume it does, the high limit on the FS might be the culprit. (like Pete wrote). ------------- Play hard, life's not a trial run. '85 BFN '90 BFN White Lake, Michigan |
Posted By: Gary S
Date Posted: January-07-2015 at 5:51pm
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You guys are going to have to come down to my level, tip and ring what is the high limit? is that a sensor that looks for a overheat? Joe this unit while having a circut board has no lights,and just keeps running like it has for the last couple of hours,ie no lock out. Thermostat is just a 2 wire cheapy. I put it everything in back in 95 and other than the flame sensor and 1 exhaust blower,it has been fine and has had no other changes. This problem started last year and frankly not being around I didn't worry about heat in the garage! Could I short the thermostat wires together and see if that changes the operation to eliminate thermostat problems. Or is that a no no on a furnace with a board? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: tullfooter
Date Posted: January-07-2015 at 5:58pm
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I doubt it's the thermostat unless, like Joe said, you are blowing right on the thermostat. I'm betting on the fan switch. I'm used to the ones with the chrome dial that you can watch turn back and forth while it's cycling. Have you checked the exhaust vent for blockages? ------------- Play hard, life's not a trial run. '85 BFN '90 BFN White Lake, Michigan |
Posted By: Gary S
Date Posted: January-07-2015 at 6:28pm
Here a pic of the controls- What is what?? I guess there is no board it's all sealed  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: phatsat67
Date Posted: January-07-2015 at 6:29pm
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Cut the yellow wire, that's always the safe ones in movies right? ------------- |
Posted By: 8122pbrainard
Date Posted: January-07-2015 at 6:34pm
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Gary, I doubt it has the good "high end" Honeywell limit Steve mentions. More likely it has a "clicks-on" type and they are known to be a problem. Do you have the wiring diagram? Certainly after all the years with a Bell company you can follow it. The high limit should be labeled on the diagram. Find it and see if power (24V) is going through it when the burner shuts down. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Gary S
Date Posted: January-07-2015 at 6:55pm
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Yes I have it Pete it's on the cover plate. I thought it was the blue wire Zach, I'll just cut the yellow one then and see what happe--- ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: peter1234
Date Posted: January-07-2015 at 7:07pm
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it might be your fan proving switch timing out the flame once in a while . the little silver ufo looking thing next to the fan and limit (brown thing) next to the silver thingy ------------- former skylark owner now a formula but I cant let this place go |
Posted By: peter1234
Date Posted: January-07-2015 at 7:08pm
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or a hose going to it could be plugged. i'd just go to florida and forget it ------------- former skylark owner now a formula but I cant let this place go |
Posted By: 8122pbrainard
Date Posted: January-07-2015 at 7:17pm
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Gary, When you find the high limit, jumper it out. All good HVAC guys carry jumper wires with alligator clips on each end! Then see if it makes a difference. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: peter1234
Date Posted: January-07-2015 at 7:27pm
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no pete all good hvac guys carry 2 sets one easy on uninsulated and one line voltage insulated ------------- former skylark owner now a formula but I cant let this place go |
Posted By: 8122pbrainard
Date Posted: January-07-2015 at 7:33pm
Peter, I'll never forget one day when I was up on the roof with one of the guys from our HVAC firm trouble shooting one of the rooftops. He had forgotten his jumpers in his other bag and it was down in his truck. He was absolutely lost!! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
peter1234 wrote:Posted By: Gary S
Date Posted: January-07-2015 at 7:49pm
Right now Im leaving it sit,its up to temp out there now and has shut off but my feet are cold  I'll shut if off for now and try it later,should not take long to cool off out there. I'll try the jumper next the limit switch is clearly marked,it's a combo switch where the limit side is on top and below is the gas valve side------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Hollywood
Date Posted: January-07-2015 at 10:04pm
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Ill second peters suggestion of heading south. What the hell are you doing up here? ------------- |
Posted By: Orlando76
Date Posted: January-07-2015 at 10:15pm
| Don't head south, we're gonna hit 40 tonight. Now I have to remember how to turn my heat on. |
Posted By: Gary S
Date Posted: January-07-2015 at 10:24pm
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I heard something about Chicago Beers and with gas and me being cheap, here I am. And I missed doing this-  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: peter1234
Date Posted: January-08-2015 at 7:31pm
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you can do that in the sand at the beach...go ------------- former skylark owner now a formula but I cant let this place go |
Posted By: Gary S
Date Posted: January-08-2015 at 8:15pm
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Thats the plan Peter. Braved the cold to get a jumper in the other garage but then went inside and sat by the fireplace,will look at the heater tomorrow- maybe. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: January-10-2015 at 9:46am
Gary, You've been spending way too much time down south! Just remember the cold days kneeling in the snow at a ped!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 8122pbrainard
Date Posted: January-12-2015 at 8:14am
And, any results? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: jbear
Date Posted: January-13-2015 at 2:21am
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hmm...no answer Pete...maybe he used his head and headed south. he better stop here on his way by this time.... john ------------- "Loud pipes save lives" AdamT sez "I'm Canadian and a beaver lover myself"... |
Posted By: 8122pbrainard
Date Posted: January-13-2015 at 11:50am
Or he tried to jumper the wires under the red and yellow wire nuts and now is too embarrassed to reply!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Gary S
Date Posted: January-13-2015 at 12:14pm
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I taking Peters advise and spending my time packing instead. I'm tired of having to get bundled up,I'm tired of moving this white stuff and I'm tired of looking at a boat stuck on a lift when I can actually be using one. Being cold and not getting compensated for it does not appeal to me anymore. Got myself a new Garmin chart plotter and a new VHF radio for an update in electronics. A day of installation in flip flops and a t shirt and I'll be set! I did jump the limit switch and no change. My next step is to check the pressure hose and fittings on the exhaust side,that can wait until I get back since it will be a little warmer out. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |