Search: Posts Made By: user 10
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12-17-12, 04:25 PM
Replies: 34
Views: 5,300
Posted By user 10

That's a 58F rise, which is okay but a little...

That's a 58F rise, which is okay but a little high.

50F is optimal for a modern furnace.

Anything lower than 45F would feel drafty.

I think anything lower than 40F could cause condensation...
12-13-12, 10:36 PM
Replies: 34
Views: 5,300
Posted By user 10

Normally modern gas furnace should have a...

Normally modern gas furnace should have a temperature rise of 40-60F.

Oil units might put out hotter air - shoot for no higher (rise) than 70F if there's no temp rise range printed on the rating...
12-07-12, 12:02 PM
Replies: 34
Views: 5,300
Posted By user 10

Don't change the speed without checking the...

Don't change the speed without checking the temperature rise.
12-05-12, 12:39 PM
Replies: 34
Views: 5,300
Posted By user 10

So the fan cycles a few times before it stays on?...

So the fan cycles a few times before it stays on? Example - hits 140 and turns on, drops back to 90 and shuts off a few times until the furnace warms up.

Does the oil burner stay on when the...
12-04-12, 10:24 PM
Replies: 34
Views: 5,300
Posted By user 10

The heating blower speed was probably set by the...

The heating blower speed was probably set by the installer to get proper temperature rise. Every duct system is different.
12-04-12, 09:45 PM
Replies: 34
Views: 5,300
Posted By user 10

Normally at those settings, the fan shouldn't...

Normally at those settings, the fan shouldn't cycle like that.

You can try changing the fan off setting to 85F; if that doesn't work change the fan on setting to 145F. (don't go higher than that)...
12-04-12, 06:43 PM
Replies: 34
Views: 5,300
Posted By user 10

Your furnace does have a fan/limit switch. ...

Your furnace does have a fan/limit switch.

Does it look like this?

http://www.myhvacparts.com/store/media/education/honeywell-fan-limit-switch.jpg
12-04-12, 10:03 AM
Replies: 34
Views: 5,300
Posted By user 10

The blower speed may not be too high. If...

The blower speed may not be too high.

If your furnace is 15+ years old, it may have a adjustable fan/limit switch which controls the fan. A small adjustment may be needed.

Post a picture of the...
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