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Old 09-24-2017, 05:34 PM   #1
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2018 30' Classic
Edmond , Oklahoma
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What's this valve?

We purchased a 2018 Classic 30 last week. The dealer had partially filled the tank with water...tasted horrible so we are draining it today.

Came across this valve but there is no mention in owner's manual.

We noted that when we turned it on we got fresh water! So that I know...but what is the purpose?

Thanks!


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Old 09-24-2017, 05:57 PM   #2
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Kalispell , Montana
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Low point drain for winterizing.
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Old 09-24-2017, 06:24 PM   #3
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What's this valve?

There are two low point drains next to the fresh water tank drain. All three are located between the tires. This one was for sure giving me fresh water from the hose which is connected and turned on. I know this because I turned off the supply and voila the water stopped coming out this drain also.
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Old 09-25-2017, 04:51 AM   #4
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The valve you pictured is an additional low point valve for the bathroom area.

Then there are two others under the trailer, almost between the two wheels mounted on the tanks, one is hot one is cold.

Then another one under the dinette for the hot water jacket in the Alde boiler.

Bud
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Old 09-25-2017, 06:19 AM   #5
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Quote:
Originally Posted by paiceman View Post
The valve you pictured is an additional low point valve for the bathroom area.

Then there are two others under the trailer, almost between the two wheels mounted on the tanks, one is hot one is cold.

Then another one under the dinette for the hot water jacket in the Alde boiler.

Bud


Ok, it makes sense. I can imagine other uses...a quick bucket fill and perhaps even a cold water hand wash.
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Old 09-25-2017, 06:41 AM   #6
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I use that valve to drain the hot water tank when I need to capture another aggravating air bubble in our hot water tank. I do have to open the pressure relief vale when I do.
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Old 09-25-2017, 02:47 PM   #7
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I use that valve to drain the hot water tank when I need to capture another aggravating air bubble in our hot water tank. I do have to open the pressure relief vale when I do.
2017 actually don't have a traditional hot water tank. Only a small 2.5 gallon water jacket in the Alde boiler and it is drained by a flip valve under the front dinette.

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Old 09-26-2017, 11:35 AM   #8
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Hi

The most practical use for that valve is to do a quick flush once all the hoses are hooked up. It's right where you want it for that purpose. Open it for 20 seconds or so to run all the weird critters out of your hose and the campground supply line.

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Old 02-21-2018, 05:40 PM   #9
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The valve is to relieve the pressure in the system prior to disconnecting the water line.
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Old 02-22-2018, 06:47 AM   #10
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If you hold that hinged door just right, also good for rinsing knees to toes.
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Old 02-22-2018, 12:42 PM   #11
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OK, I've been meaning to do this for a long time. This question has been skirted, partially explained and answered incorrectly for a long time....and AS has NEVER put a good explanation in any manual that I know of.

Everything in the explanation will revolve around these two pictures. This is a 2007 classic, but I believe any AS with the outside water compartment down below the floor, in the curved under belly would be the same in operation, although some of the components have changed.

PIC #1 (outside water compartment)

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PIC #2 (water heater compartment)

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Components and description: Outside water compartment
1) city water hose hookup (far Left, white in color)
2) low point drain, water heater drain, outside hand held shower hookup (brass household hose bib)
3) Black tank flush (far right around the corner, black and chrome

All of these components are below floor level and outside the frame rail. As such there is ZERO freeze protection for all of these components. When hooked to city water, the outside hose bib/low point drain is tee'd off the fresh water hookup directly behind the mounting panel. The other leg of the tee, goes through the floor, up into the undersink area by the water heater. From there that line feeds the entire trailer fixtures, including the water heater.

Components and description: Water heater compartment

1) Far left edge of pic = water line from outside water compartment which feeds entire trailer when on city water hook-up.
2) Chrome valve, front center of pic = outside water compartment shutoff, for use in freezing temps AND while using tank water/pump.
3) bypass line and one way valve (brass) = runs behind and around the chrome shutoff valve. This brass one way valve allows water to flow from left to right in the bypass lines, but not right to left.

Operation:

Summer operation while on either city water or tank water: Keep chrome bypass valve open.
1) city water will feed the outside spigot/drain and the whole trailer.
2) while on tank water, outside spigot will still be fed since chrome valve is open.

Winter operation while on tank water: Close chrome bypass valve; open the spigot/drain, and use low pressure air in the city water hose connection and let it blow out the spigot/drain. Leave the drain/spigot open during freezing weather.
Since the chrome valve is closed and the bypass valve will not allow right to left flow of tank/pump water, the entire outside water compartment is now empty and isolated from pump pressure and you will have no damage to the outside components.

Other benefits:
1)Spigot/drain can be used for an outside water source whether on city water or tank water in above freezing temps.
2) the outside spigot makes an excellent water heater drain, eliminating the need to screw around with the plastic drain on the water heater tank.
3)spigot/drain is an additional low point drain for winterizing (into storage).

I think that about does it....hope this all makes sense.
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Old 02-22-2018, 04:20 PM   #12
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Rich, Perhaps you meant to post on the 2007 Classic thread. I wouldn’t want the op to get wrong information for his/her unit.
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Old 02-22-2018, 04:25 PM   #13
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Rich, Perhaps you meant to post on the 2007 Classic thread. I wouldn’t want the op to get wrong information for his/her unit.
His pics look the same, as far as basic plumbing goes. It has been common amongst many models for a long time. I know his water heater is different, but that really doesn't matter for the outside compartment. Real question is what he has in the cabinet close to the water hookup (bath sink?). Like I said, I believe all units with hookups in the lower rounded compartment are very similar. Components and valves may be different styles, but I believe layout is same.
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Old 02-22-2018, 04:33 PM   #14
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Thank you for clearing that up me and others that may not have known.
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