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Old 03-30-2020, 01:55 PM   #1
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Heater Short Cycling Advice

Greetings all you fine folks.

Having an issue with my 40K BTU RV furnace in my bus short cycling, at a 45 degree outdoor temp (t-stat set at 60), it will run for about 4 1/2mins get it super hot in there then shut off for about 20mins, and in that 20 mins it starts to get pretty cold in there. The is repeats over again slightly annoying to say the least.


I had an old guy tell me the trick to keeping any RV warm is a low amount of heat all the time. Something a WAVE style heater would do or one of those Chinese diesel heaters.

What would you think would give me a more stable temp.

1. Rip out the RV propane rig and install diesel heater at 5K BTU might be too small in a 40ft bus in Montana. Don't look forward to the work)

2. Leave propane RV rig in place and install wave 6 heater under current T-stat (see photo) don't like that ideal as it lacks a T-stat but follows the old guys advice.

3. Remove the 42K BTU RV rig and install a 25K BTU version, with maybe a better t-stat. I vote for this but will is solve my problem.

4. Maybe it's all a waste and because I have all of my windows and stock celling in place, I will keep feeling those wild temp swings. Or maybe my poor vent placement is an issue too.

What would you guys do?
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Old 03-30-2020, 04:08 PM   #2
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Does it shutdown if you move the tstat to a higher temp too?


That looks like a 12v unit to me, are you getting the proper voltage? Low voltage makes them go wonky or not run at all. Maybe charge you batteries up if that is where it gets its supply voltage. I have one that won't fire up without a well charged battery.



John
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Old 03-30-2020, 04:33 PM   #3
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John, thanks. Yes the voltage and etc is ok, itís not shutting off just randomly, itís being told to by the T stat. If I turn up the T stat up it just boiling hot in there



Quote:
Originally Posted by BlackJohn View Post
Does it shutdown if you move the tstat to a higher temp too?


That looks like a 12v unit to me, are you getting the proper voltage? Low voltage makes them go wonky or not run at all. Maybe charge you batteries up if that is where it gets its supply voltage. I have one that won't fire up without a well charged battery.



John
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Old 03-30-2020, 05:44 PM   #4
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Join Date: Jun 2013
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If the tstat is working fine then it might be located in a poor position, too hot in other words. When that area cools off then the furnace starts up. Might want to relocate it to a cooler area, away from ductwork.
Could be your bus is to tight in that the heat is being retained longer than in a leaky old bus or rv.
Just continue experimenting I guess bit the tstat should be checked against a known working one I think.



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