Question about Cozy Enclosed Front Console Heater 70,000 btuh Natural Gas

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Fan switch will not make (limit switch).

On 1-25-08 my partner and I installed a brand new fan type wall furnacein very old apartment building. After we got the old furnace out and new furnace in place we realized that to make the new furnace fit properly the bottomplate of the furnace would have to be removed. I know that thisis not the thing to do but because of existing vent, and no room forplay, we felt that we had no other option. I personally thinkthat this could be part if not all of our problem. I'm thinkingwith this plate missing furnace plenum is not able to gererated enoughheat to activate my limit swithch to power my fan. When T-Statcalls for heat burner flame ignites as it should, but no fan. Ilet furnace cycle 3-4 times to really let some heat generate inside ofplenum to see if limit switch would make nothing. After a whilethe vent switch on the furnace which is NC will open on temp. rise asit should to kick out gas to burner. Jumped out swithch fan runsfine. Removed switch aswell to test switch for proper operation,switch is closing on temp. rise, and opening on temp fall as it isdesigned to do. Even though my limit switch test ok, could itstill be faulty. Had another technician that I work with to bringme another limit switch just in case it was bad. Long story shorthe brought me a NC switch by accident, being that it was getting late Iinstalled the NC switch to give customer continuous fan operationthrought the weekend, so they would have heat. I have ordered anew fan switch, but still not certain to what is causing fanswitch/limit control not to close and complete circuit to fan. Ifnew switch does not resolve problem, is it possible to use anotherlimit switch that closes @ lower temp. Existing switch is rated @120F-25F. Thanks for any assistance you can give me.

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Re: Fan switch will not make (limit switch).

If the snap switch is not located close enough to the plenum, this can be problem. The other option would be to cover the switch area with a metal shield or liatherm paper (fire rtardant paper).

Posted on Jan 29, 2008

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Gas furnace short cycles 2 minutes or less. Multiple troubleshoot steps and replaced components - no help. Any advice?

I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
Hope this helps.

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1 Answer

Lennox G12 furnace blower will not come on.

It may be a bad fan limit switch or a bad fan check the motor turn the thermostat fan setting to fan on or jumper between R and G where the thermostat wires connect to the furnace. If fan comes on the fan motor is probably good and it is probably the fan limit switch. If it does not come on it is probably the fan motor . This is assuming you haven't installed a new thermostat in which case it may be a heat anticipator setting too low.hope this helps.

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1 Answer

Fan staying on at all times brivis tek304

this means a limit switch is open, or the thermostat is set to fan on, as opposed to "auto".
Unplug the unit, then plug it back in and watch the sequence.

If it goes through it's normal operation and then the burners shut off, it means the high limit has been triggered. usually this means the furnace is suffocating, remove your filters and try again.
If it works fine the second time you just need new filters. if not then the high limit is bad.
The high limit is inside, near the burners on the back wall connected to 2 wires.
it's easy to replace, order a new one (be sure to get the right temperature setting, it's on the old one). pull the old one out and plug the new one in. the wires don't have sides as long is one is in Common or C, and one is in NC.

If the main fan comes on first and the furnace does not cycle, it means a limit is open (or the thermostat is in fan on mode). The rest of the limits are on the same circuit as the high limit, trace that circuit and push the button on each switch along the way, if one clicks you know you've reset it... you also know that it has been set off, which implies a safety hazard and technically you should call a pro to come see it.
Anyway, continue along the circuit checking each one until you've come to the main circuit board. then plug the furnace back in and watch it go. if that hasn't fixed it, call a professional.

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1 Answer

Blower fan running constant after new fan and limit switch installed.more info.Honeywell-tradeline.L4064B 2210, combination fan and limit control, adjustable fan differential with manual fan switch, flush...

Here's my best shot.
Check the temperature settings for the fan switch.
The low OFF setting should be about 100 degrees.
The ON setting should be around 150 degrees and this is the setting that "makes" the ON contacts.
The HIGH LIMIT setting should be about 180 degrees.
If these are set, can you use a meter to see if the FAN ON contacts are closed?
Lastly, it appears that one hot line should go to one side of the blower and the other hot line should go to the bottom FAN terminal with the other side of the blower being fed by wiring from the top FAN terminal.
Good Luck. Gary

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I have a fahrenheat wall mounted heater, 120 v model,(can't find a model number on the unit) with a dial temp control. No matter which number setting it is on, the unit cycles off after about 50 seconds....


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How to properly install plenum limit switch

If this is the old style limit/fan switch. Turn power off
remove the wires and label where they got disconnected from and wire the new one in. Make note of the settings on the old limit switch so you can
adjust the new one. The limit switches come in
different lengths so get the right one.

If it is a flat bimetal disc, then I think you have only to
wires that have to be connected so hook up same
to wires from the old one. With Bimetal disc fan
limits you need to make sure you get the same
temperature reading as the old one

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1 Answer

T-stat turns gas valve on,burner lightsburns long enough for fan stat to turn on fan,high limit shuts off gas valve,fan shuts off;repeats cycle

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