Why my Pellet stove take so long for the exhaust fan to cut out after shut down?

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
Status
Not open for further replies.
Randy

Randy

Member
May 17, 2012
87
Canada
howtobuildplans.com
Hi, I installed a low limit switch on my pellet stove exhaust fan and the stove takes longer for the fan to cut out after shut down than it did with the original limit switch. original 25 min. now 50 min. Can I change this somehow? Is it the switch or type of switch? Do I need a ceramic switch?Thanks in advance. Randy!!
 
Check the numbers on each switch to see if they match. You should see some numbers like: L140-20, or F120-20. That is the temperature of the switch. Most are not adjustable, but there are some that are. Those have adjusting screws visible.
 
heat seeker said:
Check the numbers on each switch to see if they match. You should see some numbers like: L140-20, or F120-20. That is the temperature of the switch. Most are not adjustable, but there are some that are. Those have adjusting screws visible.
Click to expand...
The number is F140 and sorry no screw to adjust. Thanks for the reply
 
It will switch the fan ON at rising temperature (at about 140º F) and will stop the fan when the temperature drops to about 120º F.
 
That means the switch contacts close at 140º. Do the old and new switches match numbers?
 
It might, but then it will take longer to start the fan and let the control know there is fire. That could result in the stove shutting down.

I'd leave it as is. My stove takes a long time to cool down, so after I'm sure the fire is out, I pull the wire off the snap disc to stop the fans. Works fine, as long as I remember to put it back. Some day I'll add a switch to make it easier. Some day...
 
heat seeker said:
It might, but then it will take longer to start the fan and let the control know there is fire. That could result in the stove shutting down.

I'd leave it as is. My stove takes a long time to cool down, so after I'm sure the fire is out, I pull the wire off the snap disc to stop the fans. Works fine, as long as I remember to put it back. Some day I'll add a switch to make it easier. Some day...
Click to expand...
That sounds good so what kind of switch? Thanks.....
 
Likely its Reverse Logic for failsafe, any open in the wire or harness or connector keeps the combustion fan running.
 
On my stove, removing the wire tells the control that the stove is cooled off, so the fans stop. Your switch closes the contacts at 140º, so I assume it would work the same. Maybe this is not the Proof of Fire switch you're playing with, or your stove uses another switch/method.

I would put a simple toggle switch in series with my snap disc.

P.S. Does your switch have 2 or 3 terminals/wires on it?
 
It has 2 terminals.

I removed both terminals/wires still stayed going.

I connected 2 terminals together still on

I am here now stuck with no stove just a few days before Christmas so someone please help me?

My stove is a Danson Bayview stove
 
Have you reset the control? Unplug the stove for a few minutes, and try again.

Will your stove not run now? I didn't see where you said that...

Do you have a multimeter so you can check the new switch out?
 
Thanks and sorry forgot to mention after I removed the wire and replaced it the fan won't cut out so I have to unplug it. When I plug it back in the fan comes on again.
 
It shut down this time but can't install the toggle switch if the stove don't shut down with the wire removed. Any other ideas? Toggle switch the fan motor itself????
 
Thanks and will try that. Is that why the motor keep running with wire removed from switch. I did install new exhaust motor when I installed the new low limit switch.
 
It sounds like you are talking about the convection blower and not the exhaust blower. You can't disable the exhaust blower....ever.
If the low limit switch doesn't stop the convection blower (either open or shorted) you probably miswired the motor when you installed it.
All this talk of reaching in and pulling wires makes me think that you are doing this with power applied. That is a very dangerous thing to do.
 
Randy said:
That is what I am talking about stopping the exhaust motor.
Click to expand...

The exhaust blower will typically run until the stove has cooled plus a fixed time set by the controls. If the low limit says the stove is still hot the Exhaust blower must still run. It may not turn off promptly when the low limit is reached.
 
Last edited:
Status
Not open for further replies.

Similar threads

S
Enviro 28 stove starts up but then does not ramp to high heat, it keeps low
Replies
4
Views
281
The Pellet Mill - Pellet and Multifuel Stoves
sartorisan
S
H
Enviro Empress FS Pellet Stove - Vacuum code resolution in step by step detail
Replies
1
Views
483
The Pellet Mill - Pellet and Multifuel Stoves
johneh
johneh
O
Breckwell SP1002 pellet burner faults out after start up
Replies
9
Views
477
The Pellet Mill - Pellet and Multifuel Stoves
johneh
johneh
tbear853
Vermont Castings saved our bacon this week.
Replies
1
Views
359
The Pellet Mill - Pellet and Multifuel Stoves
stoveliker
stoveliker
M
Castle Serenity Pellet Stove - Stove shuts down as it goes into Heating mode - STILL AN ISSUE after installing new Interface Module & exhaust fan
Replies
6
Views
2K
The Pellet Mill - Pellet and Multifuel Stoves
Matt D
M
Top Bottom
Back