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Old 11-10-2016, 10:24 AM   #1
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1988 25' Excella
Sunriver , Oregon
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Coleman Delta TX Mdl 6779B702

Hiya.

I have surfed this site and this thread, and am impressed with the number of knowledgeable and sharing folks herein. Refreshing to visit a community not infected with trolls.

I am no stranger to a toolbox, but this is my first adventure with an AS and the Coleman rooftop AC product. Using the search function did not find the answer to two questions I have, so if I missed an answer that is already here please share a link or steer me in the right direction. Gracias.

The Delta TX itself works as specified without effort, but after almost 30 years the interface with the trailer is no longer watertight. After removing the unit in its entirety and doing a detailed inspection, it is a small wonder it kept any water out at all. But with some replacement parts and a little work to reseal, there is no reason it can't be returned to service.

Problem and question #1: The existing plastic base pan is pretty far gone and should be replaced. I am unable to identify the Coleman part number (surprisingly, no data cast into the piece) or find a source that sells them. I know all this stuff is obsolete, but why junk a perfectly good device simply for lack of a mounting accessory(sorry, us engineers often think like that)? Can anybody steer me to a source? A used pan in serviceable condition is fine if NOS is not available.

Question #2: My condensate drain tube located inside the shell is clear (i.e. no resistance to blowing air through it). It swallows a length of fish tape that would seem to indicate it is connected to one of the holding tanks. A number of posts infer the drain tube dumps the condensate or other collected moisture overboard. Are they accurate? Where is the outlet located? The factory manual does not contain anything regarding this topic. Anybody here have experience with this?

In advance, thanks to all who would help me out.

Jim
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Old 11-16-2016, 10:38 PM   #2
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My Coleman gave up the ghost while in service at JC and was replaced with a new Dometic, so I can't help with Q-1.

The condensate drain tube exits just a few inches ahead of the road-side front wheel of the AS.
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Old 11-18-2016, 08:48 AM   #3
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1988 25' Excella
Sunriver , Oregon
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Coleman Delta TX Mdl 6779B702

blkmagikca:

Thank you for responding. All information is appreciated.

What model Dometic did you install? Are you satisfied with its performance? How long ago? Did the install require much modification of the AS?
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Old 01-09-2017, 08:49 AM   #4
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1988 34' Excella
Freeburg , Illinois
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Turbine of Sunriver Oregon...I too have the same problem you are having. My Delta TX shroud has fallen victim to UV and age. I have a 1988 Excella 1000 34.5' which utilized the Coleman Delta TX unit..The drain exits the Airstream forward of the front tire on the driver side. It is important that the extended vinyl tubing extends out of the aluminum under belly of the Airstream. Otherwise the condensate water will collect in the belly and cause corrosion at the attachment rivets of the belly aluminum as well as lesson the effectiveness of the insulation under the floor.
I have yet to find a source for a replacement AC shroud. I would rebuild the shroud with fiberglass if I had enough of the existing shroud to work with but again age and UV has done it in. Without the shroud the unit will not effectively work.
The AC base sealing of the unit is straight forward as you say you have removed your unit already. Just make sure all old sealant is removed as it can be tenacious and if any remains, it will not seal water out of your camper....
I may have to bite the bullet and upgrade to a new unit to replace the Coleman Delta TX. Installed quotes are at the high end near $1800...Camping World came in around $1300. This would include the heat strip in the unit...
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Old 01-13-2017, 11:55 AM   #5
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1988 25' Excella
Sunriver , Oregon
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fr8rbum747: thank you for responding. I appreciate your message.

By necessity, I have gathered more information since my original post. As a way of giving back to the forum community, these are some things from credible sources and knowledgeable people that I have learned:

1. AS is now installing Dometic AC at the factory. While there are alternate aftermarket brands available, some at lower price points, when the need arises to replace the original Coleman a Dometic as first choice makes sense for the following reasons:
  • if warranty, service, or repair is ever required on a Dometic, it is reasonable to expect a factory authorized AS service center to be experienced and knowledgeable in such activity
  • genuine Dometic parts should be more readily available at an AS authorized service center (don’t even get me started on the quality of substitute “equivalent” parts or supplies)
  • in general, AS authorized service facilities are more numerous and convenient (especially while on the road) than those of the other AC brands
  • **PERSONAL OPINION** Lowest price is not always best value. While there are indeed other brands that cost less, my personal research indicates the quality of materials and design offers the best value for this application.
2. Lack of NOS shroud/cover availability is a bummer for a purist like me. Companies making generic covers that fit the Coleman TX have come and gone. Currently, Maxxair Vent Corporation makes a cover that is a technical fit but looks different than the original in shape and color: TuffMaxx A/C cover, parts #00-325001 and 00-325004. There seem to be a couple of retail outlets selling them. On the internet, AdventureRV.net has a competitive price of $105 + shipping. PM to me for manufacturer’s build sheet data in pdf if you wish. I have not ordered one yet (more pressing issues at this time) so I cannot attest to quality or fit. I will report back when I have something informative to say.

3. I did find a replacement source for the pan sandwiched between the Coleman AC unit and the exterior surface of the roof of the trailer. However, the cost of shipping was brutal and just about doubled the delivered cost to almost $400. That is a tough call given the uncertainty of how much longer the original Coleman TX may stay serviceable. The original pan is acrylic styrene, which means it can be resurrected with the right materials and a willingness to spend some time on it. Haven’t made a decision yet on course of action. Still hoping to stumble across a good used article.

You talked about replacing the Coleman w/Dometic including the heater. Some credible folks have expressed concern about the heater option. Seems the compressor runs when the heater is on, even though it is not really needed. The compressor is a finite life part, so will it require expensive replacement before the rest of the AC unit wears out? Not to mention the cost of unnecessary power consumption driving the compressor. Might want to get clarification on that issue from your vendor if you end up replacing the Coleman.


Thanks again for writing, and let us know how it all turned out for you. Knowledge is power.


Jim
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Old 01-16-2017, 09:48 PM   #6
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1988 34' Excella
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Coleman Delta TX replacement

After contacting my local AS dealer I was told that the fan portion runs during heat strip operation but not the compressor. This is the same as in using the original Coleman Delta TX..
By using the switches on the ceiling you effectively eliminate the compressor operation when selected to heat. The blower fan will blow and is adjustable to speed with the blower fan rheostat. The replacement unit will be what the AS factory is now installing when I take it there this spring for replacement.
In the mean time I have acquired a Max Aire / Tuff Aire shroud. When I get what is left of my original top shroud from the Delta TX off the trailer I will attempt to install the replacement top shroud and will report on this forum if that actually can be done and what else was involved in that install. I am not worried so much at this point in maintaining the originality of the sleek Delta TX shroud on the top of the Airstream as some on this forum mentioned. I just need functionality and protection for the unit until I get it to the dealer to replace...about a 5 hour drive at highway speeds.
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Old 01-16-2017, 10:04 PM   #7
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1988 34' Excella
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Delta TX Replacement Shroud

Turbine...Thanks for all the information you had in your post...I failed to mention that in my previous post in answer to you..
We have both traveled down the same paths in research on the internet...I made several calls to get first hand answers prior to purchase of the Maxair Tuff shroud. Many of my queries were dead ends and the only real answer concerning an original shroud was to look in trailer salvage yards...
As far as your problem with the lower pan I wish you luck. I found nothing. I will not be removing the entire AC unit from the AS in that it appears the lower pan on my unit will be usable for my intents and purpose. If and when I get this unit replaced I will attempt to salvage my lower pan. Perhaps, if in any kind of usable condition, you may be able to use it to replicate it or use it on your rig. I will keep you informed if you are interested. Hey the price would be right...as in free to you...I would even pay for the shipping to help out another Airstreamer...
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Old 01-16-2017, 11:20 PM   #8
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1988 25' Excella
Sunriver , Oregon
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Gracias.
Yes, please keep me in mind if your pan is salvageable. No, please let me at least cover the cost of shipping. I’d feel uncomfortable otherwise. But thank you for offering!
How soon are you expecting to install the TuffMaxx shroud? I will be anxious to know your opinion of quality and fitment.

Jim
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Old 02-17-2017, 10:11 PM   #9
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1988 25' Excella
Sunriver , Oregon
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Report on TuffMaxx shroud

Bought the TuffMaxx shroud. Wifey insisted on polar white. I would have been OK with black, since this item is not identical in appearance to the Coleman Delta TX. I think TuffMaxx is missing out on additional revenue by not offering a grey similar to the factory original. I would pay more if grey/silver was available. That would have been my first choice.

Fitment was correct to the AC unit in terms of height and close fit to the pan. No modification required, other than a new hole in the top of the shroud for the two rear mounting studs. Because the front studs fit without issue, it was a piece of cake to locate and make the new holes.

Material quality seems excellent. Higher density than factory shroud, and thicker. For the price, I think it an excellent value.

Jim
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Old 02-17-2017, 11:33 PM   #10
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You can always paint it.
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