Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-26-2016, 10:35 PM   #15
Rivet Master
 
1998 30' Excella 1000
Livingston , Texas
Join Date: Jan 2014
Posts: 546
Quote:
Originally Posted by m.hony View Post
No propane in use.
In a campground hooked to shore power-
Running water heater on electric-
No need for furnace-


Sent from my iPad using Airstream Forums
So are you saying that these were the conditions when you heard the humming mentioned in your original post?
__________________

__________________
Siegmann is offline   Reply With Quote
Old 03-27-2016, 05:58 AM   #16
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
Yes.
Mild day-
Plugged in at a campsite-
No propane being used-
Both tanks full-
Seemed to only do it when batteries removed and stopped when new batteries installed and power switched back on-


Sent from my iPad using Airstream Forums
__________________

__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is offline   Reply With Quote
Old 03-27-2016, 07:08 AM   #17
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
Is it possible to have a propane leak and not smell any propane?

Are all connectors on the propane system accessible? Are their any connectors located under the subfloor?

Kelvin
__________________
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
KJRitchie is online now   Reply With Quote
Old 03-27-2016, 07:56 AM   #18
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
The sound is at the tanks, regulator, gauge.
I'm sure if there was a leak I'd smell it.


Sent from my iPad using Airstream Forums
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is offline   Reply With Quote
Old 03-27-2016, 08:09 AM   #19
Moderator
 
jcanavera's Avatar

 
2004 30' Classic Slideout
Fenton , Missouri
Join Date: Mar 2002
Posts: 9,002
Images: 143
Send a message via AIM to jcanavera Send a message via Skype™ to jcanavera
You say nothing was on, but I'll bet the fridge was on. Based on your model year it probably is a model with the automatic fuel changeover. No power and the unit changes over to gas. Power on, gas goes off and fridge returns to it's electrical mode. I've heard my regulator have a low hum also but it was the fact that we were flowing gas from some gas appliance.

The only thing that doesn't quite add up is you noted "the batteries being removed". Unless something has changed in the newer years, I always thought that some power (from the battery) was required to keep the AES electrical brains of the refrigerator circuit alive even when operating in gas mode. Maybe the control panel now retains just enough power long enough to make that final switch over to gas when it sees the voltage level drop in order to maintain refrigerator cooling? That would make sense to me. Or is there some power feed from the battery that the AES monitors? I'm assuming when you did the battery change out you were still plugged into electrical power and either turn the master disconnect switch into the off position prior to changing out the batteries? I know I have always turned off the disconnect switch prior to a battery change out.

As a matter of fact I've had a hum from my home natural gas regulator. The hum was so loud that my neighbor heard it when walking between my home and he and called me. We ignored it at first but eventually the hum got loud enough to change tones to higher pitch and become fairly loud. Called the gas company and they changed out the regulator and meter. They guy coming out said there probably wasn't any probability failure even though it was quite loud. He replaced anyway it because it was excessively loud when the furnace was drawing gas.

Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
jcanavera is offline   Reply With Quote
Old 03-27-2016, 08:50 AM   #20
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
I don't think so.
The power was turned off at the disconnect.
The house batteries were removed.
Doesn't the refrigerator require 12 volt power to the circuit board for the thermostat, switches, and digital display?


Sent from my iPad using Airstream Forums
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is offline   Reply With Quote
Old 03-27-2016, 09:07 AM   #21
Moderator
 
jcanavera's Avatar

 
2004 30' Classic Slideout
Fenton , Missouri
Join Date: Mar 2002
Posts: 9,002
Images: 143
Send a message via AIM to jcanavera Send a message via Skype™ to jcanavera
That's what I thought but maybe it's been refined to detect either a loss of 12 or 110 volts. Should be easy for you to prove back.

Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
jcanavera is offline   Reply With Quote
Old 03-27-2016, 11:36 AM   #22
Rivet Master
 
kdickinson's Avatar
 
1969 23' Safari
Palmer Lake , Colorado
Join Date: Oct 2014
Posts: 524
That was happening to me, I could hear it from inside the trailer at night. I went out and turned the propane off at both source tanks. The humming went away. I needed some service done anyway so I asked to have the LP system pressure checked and sure enough there was a slow leak at the refrigerator.
__________________
kdickinson is offline   Reply With Quote
Old 03-27-2016, 01:50 PM   #23
Moderator
 
jcanavera's Avatar

 
2004 30' Classic Slideout
Fenton , Missouri
Join Date: Mar 2002
Posts: 9,002
Images: 143
Send a message via AIM to jcanavera Send a message via Skype™ to jcanavera
One of the best ways, and what I do every spring is to pressurize the system and check all the gas appliances. Once I'm sure everything lights, I turn off the gas at the tanks and walk away for an hour or two. Then I come back and with the valves still off, attempt to light a burner on the stove. If it lights and burns, I know I still have pressure and no leaks. May not be the absolute way but if I have a leak it should be obvious.

Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
jcanavera is offline   Reply With Quote
Old 03-27-2016, 05:09 PM   #24
Rivet Master
 
1998 30' Excella 1000
Livingston , Texas
Join Date: Jan 2014
Posts: 546
You've got a real mystery here.... be sure to let us know how you resolve it.
__________________
Siegmann is offline   Reply With Quote
Old 03-27-2016, 11:27 PM   #25
Classy Roscoe
 
Jekerrville's Avatar

 
2017 30' Classic
1969 31' Sovereign
Kerrville , Texas
Join Date: Jun 2015
Posts: 143
Smile Mystery gas hum.

Mystery LP gas regulator hum? Hum.

Ever looked inside a gas regulator? They are really simple devices. Gas flow (vapor not liquid) enters the input side of the regulator and makes its way to a very small orface ( specially cut bowl shaped opening).

At that point there is a dumbbell shaped valve structure that rests against this small bowl opening in such a way as to completely cut off the flow of vapor thru the bowl opening and out of the regulator.

The opposite end of the dumbbell rests against a large diaphragm. On the opposite side of the diaphragm is a spring that can be adjusted with a screw. Some regulators are set and you can not adjust, thus no screw.

The spring is set so that regardless of the input vapor pressure against the diaphragm only .25 pounds per square inch of vapor can pass around the dumbbell end in the cup shaped opening. The spring makes sure of this flow rate as the vapor pushes against the diaphram trying to open the passage way.

Now that you know how to make a watch. I tell you what time it is

Sometimes this valve assembly will start to vibrate at such a rate (open/close) as to sound like a hum. It's harmless. If you turn on additional gas appliances you can change the tune of the hum or it will go away altogether. As the available tank vapor pressure changes the hum of it can go away as well.

As far as the batteries having anything to do with it, I agree it is just the frig swapping from gas to AC. There may be enough residual power left in the filter capacitors of the AS power converter to keep the 12 VDC controls alive in the frig to pass a bit of vapor when the batteries were out of circuit.

Happy Trails
__________________
Jekerrville is offline   Reply With Quote
Old 03-28-2016, 08:38 AM   #26
Wise Elder
 
Jammer's Avatar
 
2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,119
Quote:
Originally Posted by m.hony View Post
I don't think so.
The power was turned off at the disconnect.
The house batteries were removed.
Doesn't the refrigerator require 12 volt power to the circuit board for the thermostat, switches, and digital display?


Sent from my iPad using Airstream Forums
If you have the batteries removed, and are plugged into shore power, there may be some DC ripple that will cause slight vibration and humming of any of the DC wiring that is carrying current, and of the converter itself.

Is it possible that was the source of the hum, rather than the propane system itself?
__________________
To learn to see below the surface, you must adjust your altitude
Jammer is offline   Reply With Quote
Old 03-28-2016, 01:27 PM   #27
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
Shore power turned off at disconnect-
Noise seem to be definitely coming from propane tanks-
My head/ear was right there as I was installing new house batteries-


Sent from my iPad using Airstream Forums
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is offline   Reply With Quote
Old 03-28-2016, 08:33 PM   #28
Rivet Master
 
1998 30' Excella 1000
Livingston , Texas
Join Date: Jan 2014
Posts: 546
Have you tried putting the fridge on gas or lighting a stove burner and see if you can detect the sound again?
__________________

__________________
Siegmann is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
humming gas tank mixedpuppy LP Gas, Piping, Tanks & Regulators 2 11-29-2015 08:59 PM
Propane Tanks Humming Mrs. Bale LP Gas, Piping, Tanks & Regulators 3 02-19-2012 03:54 PM
Humming / buzzing when hooked up to elect likable_1 Batteries, Univolts, Converters & Inverters 3 08-23-2011 12:42 PM
Buzzing Radio farmerjim General Motorhome Topics 1 02-07-2004 09:56 PM
Univolt Low Buzzing Noise rjones1138 Electrical - Systems, Generators, Batteries & Solar 23 07-16-2003 07:23 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:53 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.