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09-26-2019, 08:06 AM
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#21
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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Quote:
Originally Posted by goodellj
......
. There is an on-off switch at the water heater, and I learned the hard way that when you are draining the tank, turning this switch off should be step one. The switch controls both gas and electric and prevents accidentally heating an empty tank.........
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Actually I think on most, if not all, the switch mounted on the front of the water heater only controls the electric heating element, not the propane burner.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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09-26-2019, 10:46 AM
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#22
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,363
M.O.C. #4831
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Quote:
Originally Posted by goodellj;
<snip>.. The switch controls both gas and electric and prevents accidentally heating an empty tank...
</snip>
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Not exactly. That external rocker switch only control the 120V side of the water heater. The propane side works regardless of the rocker switch position.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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09-26-2019, 05:23 PM
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#23
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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You all beat me to it. The external switch on the water heater itself ONLY controls the 120 volt ac. NOT the propane.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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10-28-2019, 01:12 PM
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#24
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Established Member
Join Date: Oct 2019
Location: Georgetown
Posts: 23
M.O.C. #25205
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Could someone explain to me why there is an electric and gas switch inside. On my last rv, there was just a switch on the water heater and one for propane. When I had RV school I was told to remember, the switch on the water heater is always first on and first off. What does the electric switch inside do??
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10-28-2019, 01:41 PM
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#25
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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The inside switch is wired in series with the switch on the water heater. You can turn on the switch on the water heater and leave it in. Then you can control the water heater, electric or propane, from inside.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-28-2019, 01:46 PM
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#26
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Established Member
Join Date: Oct 2019
Location: Georgetown
Posts: 23
M.O.C. #25205
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I got that, thanks, but definately do not leave the outside one on or it will burn up??
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10-28-2019, 02:07 PM
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#27
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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Quote:
Originally Posted by Karenraecamp
I got that, thanks, but definately do not leave the outside one on or it will burn up??
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Since they are effectively wired in series, you have to leave the outside one on for the inside one to work. Leaving the outside one on will not burn up anything.
I say effectively wired in series because the inside switch is actually 12 vdc that energizes a relay that sends 120 vac to the outside switch that sends 120 vac to the heating element. I posted a diagram of that wiring in a comment a little farther up this thread.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-28-2019, 02:32 PM
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#28
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Established Member
Join Date: Oct 2019
Location: Georgetown
Posts: 23
M.O.C. #25205
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thank you
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10-28-2019, 05:30 PM
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#29
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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Quote:
Originally Posted by BB_TX
Since they are effectively wired in series, you have to leave the outside one on for the inside one to work. Leaving the outside one on will not burn up anything.
I say effectively wired in series because the inside switch is actually 12 vdc that energizes a relay that sends 120 vac to the outside switch that sends 120 vac to the heating element. I posted a diagram of that wiring in a comment a little farther up this thread.
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Exactly, well stated. First thing I do when breaking camp where I have electric service is to turn that exterior switch off so the inside switch will do nothing. I even go so far as to put tape over the propane switch if we have power and vice versa if we don't. Its a given someone will turn on the wrong switch. Usually the DW. LOL
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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