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Old 07-26-2016, 09:49 AM   #11
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So after only 1.5 seasons (which admittedly are long and brutal in South Louisiana) our rear Coleman Mach 8 15K BTU air conditioner died. The compressor locked up.

After a lot of hemming and hawing about how to move forward, I decided to replace the unit with a Coleman Mach 15 (also 15K BTU).

The new Coleman would have several drawbacks:

1. Doesn't fit "exactly" the same
2. May or may not work with the existing wiring, thermostat and control module
3. Adds an additional few inches to the already very high profile of the Trilogy.

The pros outweighed the cons for me:

1. Longer track record of durability
2. To say much quieter is an understatement. (Inside and outside)
3. Less expensive to replace
4. Better cooling power

I wanted to share that I was able to throw the old unit off of the roof and drag the new unit up the ladder and install it in about 1 hour. I say "install" loosely because technically it's not even bolted down as I wait on a mounting bracket to arrive that I will have to place below the unit in a new hole in the ceiling. It's not a tough job and will take about 15 to 30 mins to complete. I will have to add new trim to clean up the look from the inside.

In the end I wanted others to know that it is possible to swap the Mach 8 with a Mach 15 with no major issues. In my experience the quieter operating is the single biggest advantage. My wife actually had to get up in the night to go check it because she thought it wasn't running. It's that quiet.

I also wanted to note that there is a potentially huge loss of cooling power with the original install as Dynamax saw fit to just throw the gigantic control module box right down into the intake area of the 14" x 14" AC hole in the ceiling which consequently disrupts airflow significantly and blocks I would estimate about 30% or more of the airflow into the AC unit.

The solution is to move the control box up into the AC unit and screw it down. It won't block the airflow near as much and will greatly assist the unit's ability to cool. This can be done on the Mach 15 but there is no room to move that control box up into the AC unit in the original Mach 8. I believe this is the source of a huge loss in cooling in the Trilogy models.

I am including a photo of the control box in the intake for reference.

If you need to replace an AC and want quieter operation and better cooling AND can deal with a minor modification to the mount procedure as well as a few more inches in height then I would greatly recommend the Mach 15.

Attachment 115084


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Our Coleman Mach 8 15,000 btu also died yesterday after 1.5 seasons! Same exact thing! WTH?!

Good news is it's still under warranty.

Bad news is getting is serviced.

Found a Mobile RV repair guy who's an authorized service person, but he can't get out to me for another 6 days. Plus, he needs to find the unit in stock somewhere.

Frustrating.


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Old 07-26-2016, 10:15 AM   #12
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I would imagine it basically comes down to supplier pricing. They probably base who they use on the current best bid for a supply contract for a production run/brand/season (or combinaton thereof) of RV units. Lowest bidder gets the contract--it's all about keeping production costs as low as absolutely possible. As far as brand goes, I find that it's like Ford/Dodge/Chevy. Some people like what they like and nothing will change their minds. I just want whatever works best at a reasonable price.

That being said, switching from Coleman to Dometic or any other brand for that matter would be a serious pain as it appears from what I have read that it would require completely new everything AC unit, mounting hardware, ceiling bracket, control module, thermostat--even down to the wiring to the thermostat!
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Old 07-26-2016, 10:18 AM   #13
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Originally Posted by Ksilvi View Post
Our Coleman Mach 8 15,000 btu also died yesterday after 1.5 seasons! Same exact thing! WTH?!

Good news is it's still under warranty.

Bad news is getting is serviced.

Found a Mobile RV repair guy who's an authorized service person, but he can't get out to me for another 6 days. Plus, he needs to find the unit in stock somewhere.

Frustrating.


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That was the other issue we had. No one seemed to stock the Mach 8. Wonder why? :-)
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Old 07-26-2016, 11:15 PM   #14
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kwoodrg, did you look at a replacement yet for your living room for when the time comes? Just curious if you found one with a heat pump in it. I haven't looked myself, so guess I better do that too.

John
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Old 07-27-2016, 09:01 AM   #15
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kwoodrg, did you look at a replacement yet for your living room for when the time comes? Just curious if you found one with a heat pump in it. I haven't looked myself, so guess I better do that too.

John

Had the same idea...good website


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Old 07-27-2016, 03:11 PM   #16
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Replace Coleman Mach 8 AC Unit

Well my ac problem turned out to be the dreaded Coleman Mach 8 cracked fan blade. Not a bad compressor.

I'm not sure why Coleman doesn't just recall these fan blades that ALL fail. We got lucky and the blade broke off and wedged itself into the other blades. I've read others that have had the blade cause damage to other components inside the ac.

So I found a mobile RV repair guy who's doing the warranty work. But Coleman is only paying for parts and labor. But not the extra $85 for a service call.

All dealers in my area couldn't even get me an appointment until after Labor Day. It's hot NOW. It's broken NOW. Seems like Coleman should pay the whole bill under the warranty. Especially since this is a known issue for these fans.


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Old 07-27-2016, 03:11 PM   #17
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kwoodrg, did you look at a replacement yet for your living room for when the time comes? Just curious if you found one with a heat pump in it. I haven't looked myself, so guess I better do that too.

John
We don't have an AC unit in the living room. We only have one unit in the rear bunk room and one in the front bedroom. This is a 37BH model. The two running at both ends of the camper push air through the ducting into the middle living room area. Due to the recent failure, the rear unit is now replaced now with the Mach 15 (AC only) unit. The front unit (when it goes out) will be replaced with a Mach 15 AC only unit as well.

For heat, we use the electric fireplace and set the furnace at a lower temp for back up if it gets chilly enough. We don't really need a lot of heat where we live and since we get our camp site and all utilities for free it works well for us most of the time.
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Old 07-27-2016, 09:18 PM   #18
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Found the post below on another Forum, April 2016:


Apparently, RVP made a fan blade change on the Mach 8 A/C’s in mid-2014 from a six-bladed fan (the original 1472A504 version) to a three-bladed fan (the 1472B504version) due to a noise problem. There was a design/manufacturing problem with the replacement part, and failures started to occur. The fan was redesigned and a new version was released (the “C” version) shortly followed by another change (the “D” version).

I contacted Airxcel/RVP and requested replacement fans and new fan motor isolation mounts for both of my A/C units. After a bit of static and mumbling, they agreed to send the replacement parts to me under warranty.

Upon receipt of the new 1472D504 fans, some of the modifications I noticed in the “D” release included:
1. Filleting of all the fan blade to hub joints. Whereas the B design fan blades met the hub at right angles, the D design fan blades have a curved radius at the joint that should greatly increase the joint strength. Even the thin edges of the blade now curve gently into the hub.
2. The bottom blade edge on the B design fans ended right at the bottom of the hub, on the D design fan blade the bottom edge of the fan blade ends a good distance above the bottom of the hub. This should provide significant additional resistance to cracking. The hub height appears to have been increased to make this change.
3. Significantly improvement in the stiffness of the entire blade assembly was noted also.

So, if you have a Coleman Mach 8 A/C manufactured between mid-2014 and mid-2015 you need to inspect or have your dealer inspect your A/C units to see which outdoor fan you have. Molded on the top of the fan hub is the part number. If it is “1472B504 or “1472C504” you or your dealer needs to contact RVP at (316)-832-4357 and request a 1472D504 replacement fan kit under warranty. Of course you’ll get the “we haven’t heard of this problem before” or “it’s not really that big of a problem” but be determined with them and get the replacement fan.

If you’ve had a fan fail, also request the isolation mount replacement kit. Due to the imbalance caused by a failed fan, the isolation mounts could be weakened or damaged.
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Old 07-27-2016, 09:32 PM   #19
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That was my post you found. It's on this forum also, witty pictures.
ALERT - Coleman Mach 8 A/C Fan Failure

Rick
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Old 07-27-2016, 09:37 PM   #20
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That was my post you found. It's on this forum also, witty pictures.
ALERT - Coleman Mach 8 A/C Fan Failure

Rick
Great post, thanks.

Like some other Trilogy owners, we have two older Mach 8's, that likely have the original LOUD 6 blade fans. In researching those that modified to the three blade fan, most of the specs show improvements in outside noise. Trying to determine if it would be worthwhile to get the new and improved three blade fans for possible interior noise improvement.
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