Coleman 8330A5221 Carrier-to-Coleman AC Control Conversion Kit

If you're swapping a rooftop air conditioner on your RV and the existing ceiling assembly is a Carrier remote cool-only unit, you don't always have to replace the whole thing. The Coleman 8330A5221 is the conversion kit that bridges the two. It adapts that Carrier remote cool-only ceiling assembly so it can run a Coleman rooftop air conditioner, and it comes with the hardware to get the job done.

Here's the situation it solves. A rooftop AC and the ceiling assembly below it are two separate pieces. The unit up top does the cooling. The ceiling assembly is the part you see and touch inside the coach, with the air distribution and the control interface. When the compressor unit fails or you move up to a Coleman rooftop unit, the old Carrier ceiling assembly and the new Coleman unit don't speak the same language out of the box. This kit is the translator. It lets the Carrier remote-style ceiling assembly control and pair with the Coleman unit, so you keep the interior piece you already have.

This is a cool-only kit. That matters. It's matched to rooftop units that cool and nothing else, so there's no heat strip or heat pump wiring in play. If your setup runs a heat pump or an electric heat option, this isn't the conversion you want. Check what your rooftop unit actually does before you order. Cool only means cool only.

The word remote in the description points to the control style of the ceiling assembly, the remote-type control rather than a wall thermostat setup. If your existing Carrier ceiling assembly uses that remote-style control and cools only, this is the kit that matches it to a Coleman rooftop unit.

A few honest notes from folks who've done this install. First, open the hardware bag and count the screws before you climb onto the roof. It's a small kit, and it's frustrating to be halfway through and find a missing fastener. Second, dry-fit before you commit. The Coleman unit's mounting holes usually line up with the Carrier ceiling assembly cutouts, but confirm the alignment on your specific coach before you seal anything down. Third, seal your roof penetrations properly. RV roofs are rarely flat, and a good bead of sealant around the screw holes is cheap insurance against a leak down the road.

One more thing worth knowing. The kit handles the mechanical and electrical adaptation, but thermostat and control behavior can vary between older and newer setups. If your controls act up after the swap, the fix is usually a matching control board rather than a problem with this kit. Plan for that possibility on an older system and you won't be caught off guard.

Who's this for? RV owners and techs doing a rooftop AC replacement or upgrade who want to reuse a serviceable Carrier remote cool-only ceiling assembly instead of buying a whole new interior unit. It's a practical, money-saving path when the ceiling piece is in good shape. And it's a genuine Coleman RVP part, MPN 8330A5221, so you're getting the factory conversion hardware, not a generic guess. If you're ordering parts for a job, match the part number against your existing setup first, and keep the packaging until you've confirmed the fit on the roof. Reusing a sound ceiling assembly also saves you the labor of pulling and reinstalling a whole new interior unit.

What it isn't. This is an RV rooftop product, not a marine AC part. Don't spec it for a boat's air conditioning. And it won't add heating to a cool-only system. Keep those two lines clear, and this kit does one job well, getting your Coleman rooftop unit talking to the Carrier ceiling assembly you already own.