Staff Answer
Jul 31, 2026 - 08:14 AM
Yes, it looks like the Dometic FreshJet 3 (FJX3473MWHAS) can replace your Duo-Therm 630515-321, but from what we've read, it doesn't appear to be compatible with your existing 5-button Comfort Control Center (CCC) thermostat (3109228.001) as-is.
As we see it, you have a couple options:
- Look into upgrading to the newer CCC2/CT control system. This involves replacing the control box and thermostat with the current-generation components designed for the FreshJet 3.
- Look into a Dometic conversion kit that would allow the FreshJet 3 to communicate with the older 5-button CCC system. This path isn't as obvious, compatibility depends on your existing control box and whether your RV is a single- or multi-zone system.
The following info would be helpful:
- Is your RV a single A/C or dual A/C setup?
- Is the 630515-321 the only rooftop air conditioner?
With that information, we can recommend the correct control box, thermostat (if required), and any conversion kit needed.
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