|
09-20-2022, 05:38 PM
|
#1
|
Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,135
M.O.C. #1920
|
Furnace/Refrigerator Issue
Right now, in Indiana, the fridge and furnace are working fine. At home (7500 feet) they still work fine, except the fridge makes a loud burping sound when burner starts on propane. Now, at 9000 feet, the furnace burps loudly when it starts and the furnace tries to start an infinite number of times but won’t keep running. Sail switch is fine, burner is fine, board is fine. Altitude related. At rally the techs checked the gas pressure with a manometer and it was perfect (11.5” of water). Anyone adjust their gas pressure at altitude? Which way do you adjust the regulator?
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
|
|
|
09-20-2022, 06:29 PM
|
#2
|
Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,455
M.O.C. #23668
|
I don't think it's a gas pressure issue. It's more likely a gas/oxygen mix issue. Looking online you might need a small orifice in your furnace at higher altitude. Is there any info in the furnace manual?
__________________
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
|
|
|
09-20-2022, 08:47 PM
|
#3
|
Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,677
M.O.C. #12947
|
None of the manuals have any mention about high altitude operation. The only other orifice available is for a couple models that can be converted and operated on natural gas which would not solve the issue of thin air at high altitude.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
|
|
|
09-21-2022, 04:41 AM
|
#4
|
Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,135
M.O.C. #1920
|
Bob, all of my research points to adjusting the pressure. I have an email in to Dometic but searching other sites I’m not too hopeful. The manual calls for 11” wc and mine is 11.5”. RVEngineer says in a search lowering water column to 8” at high altitude is suggested. I bought a digital manometer and may try adjusting to get it to work. It would be nice to get a setting that works at all altitudes. As you mentioned, there isn’t a Dometic orifice for high altitude, only LP or Natural Gas.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
|
|
|
09-21-2022, 08:29 AM
|
#5
|
Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,455
M.O.C. #23668
|
Ron, I hope you get it working and let us know what worked. I saw many articles that state that the furnace simply won't work at those altitudes...seems a little short sighted by the manufacturer but that's what I've seen. I've also been under the impression that the furnace also won't run at less than 11" column inches so I'm curious what your results will be.
__________________
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
|
|
|
09-21-2022, 08:50 AM
|
#6
|
Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,152
M.O.C. #30417
|
Quote:
Originally Posted by rames14
Right now, in Indiana, the fridge and furnace are working fine. At home (7500 feet) they still work fine, except the fridge makes a loud burping sound when burner starts on propane. Now, at 9000 feet, the furnace burps loudly when it starts and the furnace tries to start an infinite number of times but won’t keep running. Sail switch is fine, burner is fine, board is fine. Altitude related. At rally the techs checked the gas pressure with a manometer and it was perfect (11.5” of water). Anyone adjust their gas pressure at altitude? Which way do you adjust the regulator?
|
You're most likely at the altitude threshold. At 9K feet the air is pretty thin and I bet the manometer would have a different reading.
From Google. Be careful and good luck
Does altitude affect propane?
Problems arise because at higher altitudes, air contains less oxygen. For a flame to keep burning, it requires the right mixture of fuel (propane) and air (oxygen). Too much or too little of either and the flame will go out or burn inefficiently. Without a sufficient flame, your appliance won't work properly.
How do you adjust a propane regulator on a camper?
If you need to adjust your RV propane regulator, remove the cap and notice the adjustment screw underneath. Turning this screw clockwise will increase the outlet pressure, in most cases, but the proper direction of the adjustment will also be marked on the regulator itself.Jan 9, 2020
__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
|
|
|
09-21-2022, 12:11 PM
|
#7
|
Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,135
M.O.C. #1920
|
Jeff, it worked last year. Might just take a little tweak. Manual says 11” wc, so 10 might work everywhere.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
|
|
|
09-21-2022, 12:58 PM
|
#8
|
Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,926
M.O.C. #5651
|
I have stayed in the Big Horns (WY) several times. The CG is at 8600, I think and had no problems with frig or furnace.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
|
|
|
09-26-2022, 05:42 AM
|
#9
|
Established Member
Join Date: May 2020
Location: Jasper
Posts: 46
M.O.C. #26260
|
Furnace - reply from customer service
We had that issue at Grand Lake, CO at around 9,000 feet elevation. I wrote the manufacturer. Their reply is attached.
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|