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Old 03-05-2018, 01:03 PM   #1
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Question Allegro 32 SA question

Hello folks just took delivery on a 2018 Allegro Open Road 32 SA and was wondering if any of you have experienced a sewer smell coming through the coach a/c system when in use while traveling? It doesn't happen while parked. Was thinking maybe the unit did not get sealed correctly at factory.
Thanks for any insight.
Dave
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Old 03-05-2018, 06:10 PM   #2
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I don't understand the connection between the A/C and a sewer smell. The A/C, contrary to many opinions does not bring in outside air. In your coach, as in mine, the row of 4 inch duct openings on the drivers side are the return and the ones on the passenger side are the outlet. The air goes in the return, is cooled and then is sent back into the coach. It is a closed system. I can't think of any location where the ducts run near the black tank or the vent pipe. A possibility could be that something got into the duct work and died although that would be unlikely. Are you sure that the smell is coming out of the A/C outlets? If you have the bathroom fan on high while flushing that can bring smells from the black tank into the bathroom.
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Old 03-05-2018, 06:27 PM   #3
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I think a lot of the time it's the movement of travel that sloshes the water out of the p-traps in the kitchen and bath, which allows odor to come into the living space. There are roof venturi products that help pull the smell out while driving that usually help. You can also experiment by plugging the sinks before you hit the road and see if that helps.
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Old 03-05-2018, 07:15 PM   #4
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Dump and rinse out your black tank and make sure your gray tank is dumped. Put water in the sink traps, leave water in the toilet, and close all vents. If you still have odor, you need to check the AAVs (air admittance valves) which are mounted high in the corner under each sink. You might want to replace them as they are common sources of odors. BTW, most odors come from your gray tank.
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Old 03-07-2018, 07:55 AM   #5
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Allegro Odor

Thanks for your comments I had made sure all traps were full and toilet was holding water. All I can conclude is that maybe there is an access panel on the a/c not on correctly and will have to check. Like I said it is only present when using the coach a/c while traveling, you would think it would be present while parked as well.
Thanks again. Dave
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Old 03-07-2018, 09:33 AM   #6
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There is no access panel on the a/c that would allow a sewer smell into the unit.
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Old 03-07-2018, 10:33 AM   #7
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Smell in sink cabinets. The AAV are a royal pita and should be banned imho. Got to be a better solution.
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Old 03-07-2018, 04:28 PM   #8
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Smell in sink cabinets. The AAV are a royal pita and should be banned imho. Got to be a better solution.
So bathroom sink cabinet is the location ?
There is a vent system under the sink, not sure of the name of the system .But it is a inexpensive part.
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Old 03-07-2018, 07:50 PM   #9
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Dave, a few questions that may help to narrow it down. It only happens when you are moving and using the A/C correct? I assume that you are using the front A/C. Try turning it off and run the rear A/C. Does it still smell? Are your front and bathroom vents open or closed? Are the vent fans running? I agree with others in that you probably have a bad air admittance valve under the kitchen sink.
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Old 03-08-2018, 04:38 AM   #10
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+ 1 , Yes the Air Admittance valve. May not be a bad idea to have one on hand. My shower trap failed and they are not p traps they are called a waterless waste Hepovalve. Temporary solution was to wet a paper towel to block the fumes.
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Old 03-08-2018, 07:40 AM   #11
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32sa

thanks for the thread...
we have the same model on order...
--
peter says. "may be a good idea to have a valve on hand"

sounds like i need to get one for "just in case"
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Old 03-08-2018, 11:02 AM   #12
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You can pick up one in any hardware store. They are not RV specific. That said I have never had one fail.
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Old 03-08-2018, 12:24 PM   #13
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Another area to check may be where your plumbing vents exit at the roof. If your plumbing vents terminate with a "T" pipe at the top, the "T" may be placed on backwards.

If you have the "T" pipe at the top of the vents, examine the opening on both ends. The end pointing towards the front of the coach should have a smaller opening than the end pointing towards the rear of the coach. What this does is create a venturi effect in your vent pipes while traveling, sucking air out of the vents. If the "T" is backwards with the smaller opening on the rearward facing opening, the forced traveling air is dammed at the "T", going down your plumbing vents into you tanks and exiting inside of the coach... thus the smell (AC on or off will not matter). This is also evidenced by the toilet "burping" when it is flushed while going down the road.

Naturally if you do not have the "T" pipe at the top of your plumbing vents, then just disregard this long answer.
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Old 03-09-2018, 08:44 AM   #14
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A back to the basics idea. Put some more odor eliminating chemicals in the black and gray water tanks. You may not be adding enough.
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