Styrofoam block in A/C unit?

[offtohavasu]

How do I determine which size I need, Mach 3, 10, or 15?
I have a 2020 303RLS, 15k Ducted Main A/C.
Assuming 15?
Thanks

15k is Mach 15 and 13.5k (2nd air) is Mach 10

[cookinwitdiesel]

15k is Mach 15 and 13.5k (2nd air) is Mach 10

My 13.5k is actually a Mach 3 Plus

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[offtohavasu]

My 13.5k is actually a Mach 3 Plus

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From the Grand Design website parts lookup, it shows his model/year as a Mach 10 for the 13.5

[cookinwitdiesel]

From the Grand Design website parts lookup, it shows his model/year as a Mach 10 for the 13.5

I see, best way is pop off the cover and lookup the AC model number itself. I referenced pictures of mine from when I installed my soft starts

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[bertschb]

How do I determine which size I need, Mach 3, 10, or 15?

If I'm reading the RV Airflow website correctly, they have two models. One model is for the Coleman Mach 3, 10 and 15 units. The other model is for the Coleman Mach 8.

[minidilbert]

I see, best way is pop off the cover and lookup the AC model number itself. I referenced pictures of mine from when I installed my soft starts

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I looked at my Grand Design build sheet and it says that both of my A/C units are Mach 10. 2019 model 31MB. Rear 15K btu and front is 13.5K btu. I confirmed all the plenum measurements were the same on both units and within the requirements from the RV Airflow website. Used the BEATTHEHEAT promo code for 15% off and standard shipping for a total of $299 for 2 kits. Can't wait to install and try it out.

[RoJoSo]

I'm going to have to look at the model number just to make sure.
Just to be sure.

[kirk&melissa]

I will be camping in the Texas heat next week with only 30 amp service. Can only run one ac. Do you think this mod would help? I usually use the dump for quick cool, but if this works I will give it a tryin both units.
Kirk

[Double Eagle]

I see, best way is pop off the cover and lookup the AC model number itself. I referenced pictures of mine from when I installed my soft starts

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You can also find you model numbers on the back of the user manuals that are in the bag of manuals grand designs provides. There is a sticker on the back of the manual with your model number. Mine were Mach 15 and Mach 10.

[cookinwitdiesel]

You can also find you model numbers on the back of the user manuals that are in the bag of manuals grand designs provides. There is a sticker on the back of the manual with your model number. Mine were Mach 15 and Mach 10.

I wanted to do that, but actually did not have AC manuals in my bag from the dealer

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