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Old 10-30-2018, 12:07 PM   #1
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Furnace issues?

With the collective knowledge of the forum I will ask here first....

Since new the furnace in our June 21 delivered Escape has had, what I consider, a different heat cycle than other furnaces we have had.
I followed it close this last week during the colder weather.

Background: Furnace off, no heat overnight, about 40f inside in the AM.
Furnace turned on, thermostat set for 67f, so about a 30 degree rise called for.

Furnace cycle:
Thermostat call for heat
Blowers start
Gas valve opens, furnace lights. after about 5 minutes, interior temp not met yet,
flame shuts off, (gas valve shuts off), fans continue to run, gas valve again opens and furnace lights.
The cycle continues until thermostat setting has been reached.

Has anyone else noted this? could it be an efficiency gain to not run the flame full time, or is it an issue with overtemp of the heat exchanger, or overtemp switch?

Propane pressure has been set to 11 with furnace, stove, and refrigerator on.
In and out vents are not obstructed in any way that I can see

Thanks for any input or suggestions
Tom
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Old 10-30-2018, 12:21 PM   #2
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So rather than running continuously it cycles on and off until the set point is reached?
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Old 10-30-2018, 12:36 PM   #3
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The furnace has an automatically resetting high limit switch . When the switch sees too high of temps it will shut down the burner but the fan will continue to run until the plenum temperature drops . When the high limit cools it will reset and the furnace will start its’ cycle if the Tstat is calling .
Possible Causes
1) High propane pressure
2) Defective or wrong High Limit
3) Furnace intake / exhaust restricted
4) Furnace output blocked or restricted
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Old 10-30-2018, 01:10 PM   #4
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I'd definitely order a new high temp switch and replace it when you have time. They're cheap.
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Old 10-30-2018, 02:07 PM   #5
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Tom I believe that the furnace is operating normally, Iím on my second furnace and both operate as you have indicated. Iíve also had a chance to check out friends furnaces while camping, they also operate in this mode.
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Old 10-30-2018, 06:10 PM   #6
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Quote:
Originally Posted by cpaharley2008 View Post
So rather than running continuously it cycles on and off until the set point is reached?
The fan continues to run, the flame goes on and off, until set temp is reached

Quote:
Originally Posted by steve dunham View Post
The furnace has an automatically resetting high limit switch . When the switch sees too high of temps it will shut down the burner but the fan will continue to run until the plenum temperature drops . When the high limit cools it will reset and the furnace will start itsí cycle if the Tstat is calling .
Possible Causes
1) High propane pressure
2) Defective or wrong High Limit
3) Furnace intake / exhaust restricted
4) Furnace output blocked or restricted
1) 10.5 in water pressure with appliances on
2) possible and suspect
3) all clear
4) clear


Quote:
Originally Posted by tractors1 View Post
I'd definitely order a new high temp switch and replace it when you have time. They're cheap.
Probably will, just in case

Quote:
Originally Posted by PGDriver View Post
Tom I believe that the furnace is operating normally, Iím on my second furnace and both operate as you have indicated. Iíve also had a chance to check out friends furnaces while camping, they also operate in this mode.
This is what I was hoping for, someone has seen this more than once. I may call Dometic support to check with them also
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Old 10-30-2018, 06:46 PM   #7
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Just for reference we just completed a camping trip in cold temperatures -4C (24F), we left our furnace set at 18C (64F) during the day and night and turned it up to 21C (70F) in the morning.
Our furnace did not cycle as you discribed most likely because of our small temperature difference. The propane use seamed minimal over the 5 days we dry camped, with cooking, fridge and hot water on all the time as well as the furnace we didnít even use one 20lb tank of propane. Hope this helps.
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