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Old 04-25-2012, 09:26 AM   #31
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Fan / limiter switch replacement


Yep, thats the way i wired it. Even with the thermostat off, i was able to jump #2 and #4 together and the fan would run, Just cant seem to get it to start on its own via furnace temp. I did have to mount the camstat sideways into the pre existing hole for the old one, but that shouldnt have an effect on it, would it? heres a pic, the brown is connected to the black power wire. Sorry so blurry, couldnt get a good pic this morning and was rushed before work. Red is fan and yellow is furnace.

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Old 04-25-2012, 05:02 PM   #32
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heat assisted cam-stat....takes 24 volts from a gas valve.
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Old 04-25-2012, 05:04 PM   #33
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Just curious. When the old fan limit worked. How long did the furnace run before the fan came on? I have my oil furnae down fired really low, so it takes almost 10 minutes fr it to come on when I first come home and its been off all day(my basement gets really cold then). On average i would say it takes 7 to 10 minutes before my fan comes on.

Run your furnace again, and check how hot the supply plenum is or isn't after 5 minutes, then 7 minutes then 10. If it is real hot, the cam stat may be defective, if not real hot, then its just going to take it how ever long to start the fan.
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Old 04-25-2012, 07:06 PM   #34
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Don't do oil but based on what has been posted, the heat assist feature of Com Stat should be used.
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Old 04-25-2012, 08:06 PM   #35
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Fan / limiter switch replacement


Hey HVAC6546
Any cam stat fan/limit control with heat assist that I've seen requires 6 terminals to work? I only see 4 on the pic?

I'd also like to see a clearer picture that shows the designation marks of the terminals just to ensure it's been connected up properly.
Can you turn the temp adjustment down low enough to get the blower to engage with a 8 min heat run?? Try setting the "diff" to low or "A" to help.
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Old 04-25-2012, 10:15 PM   #36
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Quote:
Originally Posted by how View Post
Hey HVAC6546
Any cam stat fan/limit control with heat assist that I've seen requires 6 terminals to work? I only see 4 on the pic?

I'd also like to see a clearer picture that shows the designation marks of the terminals just to ensure it's been connected up properly.
Can you turn the temp adjustment down low enough to get the blower to engage with a 8 min heat run?? Try setting the "diff" to low or "A" to help.
I could not tell from the pic either...was just saying he should use the Cam Stat with heat assist.
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Old 04-25-2012, 10:23 PM   #37
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this is fan only.
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Old 04-26-2012, 12:04 AM   #38
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Fan / limiter switch replacement


Hey HVAC5646
Not sure what you mean with the photo.

The Cam-stat Fal3c 05td-120 that the op listed is a combination fan & limit control although I do have 5" versions of it in my truck with an additional preheater. Usually reserved for counter flows that need an earlier blower start than conventional fan/limits can provide.
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Old 04-26-2012, 08:10 AM   #39
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Fan / limiter switch replacement


Ill give it a shot tonight, ill se it to low and let the furnace run, i think its not getting hot enought where the switch is to kick it on. The old switch has those half loop bars on the end that you can see in the pics, im thinking they were up high enough to go over the metal guard by the heat exchanger, the camstat goes straight in and does not go above it.
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Old 02-16-2014, 03:53 PM   #40
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need help with a camstat 3 '' fan limit switch
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Old 02-17-2014, 09:24 PM   #41
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Fan / limiter switch replacement


try checking this site http://www.bestbuyheatingandaircondi.../fan&limit.htm

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