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Old 06-22-2020, 06:15 PM   #1
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Join Date: Dec 2016
Location: Phoenix
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Anyone add the third air conditioner to Fuzion 420?

Curious if it is likely "pre-wired" for the third AC? I have one in the front bedroom and the other is in the garage. I have two very basic thermostats for these so not sure how would "control" the three also as assume get to only use two at once. I see the location for the third was above the bunk bed where currently have a roof vent. Seems like a bit strange location so not sure how effective it is, especially since also don't know if might be some plugged ducting to tap into also to help get it from the bunk area out into the actual living area or if will just have to be a direct dump of air only?

- '16 Fuzion Chrome 420
- '15 RAM 3500 SRW 4x4 Aisin Crew
- '17 Maverick X3 RS
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Old 06-23-2020, 01:02 PM   #2
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You will need the power management module amongst many things before you can add in a third AC unit...

Does the “pre wired” option already incorporate this....



2007 GMC Classic club cab 4x4 Duramax LBZ
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Old 06-23-2020, 06:41 PM   #3
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Is there another breaker in the panel or an empty slot labeled? 3 ACís would need 3 separate breakers. Is there a plate at the vent? You can remove the trim ring and look for 110VAC Romex and maybe 5 strand thermostat wiring or 12VDC wiring.

If you donít have all the above, your probably not prewired for a 3rd AC.

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Old 06-23-2020, 07:56 PM   #4
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Our unit was prewired at the rear vent but - it was connected to a load sharing switch to split service between the front bedroom and the garage. I didn’t like that and opted to install a new breaker. The load sharing device was close to service panel so it was a short re-wiring job. There was no thermostat wiring so that was a bit of a challenge to link back to the central unit via the ducting. As Chuck noted the trim ring will reveal all. Likely both 110 ac and 12v dc for a fan is pre-staged. Good luck!

Kevin -n- Lisa
17 Fuzion 325 / 15 Chevy 3500 HC DRW
06 HD Ultra Classic
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Old 06-29-2020, 06:39 PM   #5
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Location: Fresno, TX
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Our 420 came with 3 AC units installed. One's located in the bedroom, one in the bunk bed area, and the 3rd in the garage. I can have all three AC units on, but only two will run simultaneously. It will function the same whether running on the generator or shore power. We have one thermostat on ours that shows 3 zones. I will note that it gets cold as ice in that bunk area! I don't understand why Keystone put the AC unit there and not in the living area. I've found if I close the vents on that unit, it makes a tremendous difference (increase) in the amount of air flow coming from the vents in the living/kitchen area. Sorry, I couldn't be of more help.

Dennis & Jackie
2015 Ram 3500 Laramie DRW, 6.7L CTD
2016 Fuzion 420 Chrome Toy Hauler
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air conditioner, fuzion

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