Restore reliable climate control to your older Duo-Therm rooftop unit with this direct-replacement electronic control box assembly. Designed specifically for legacy Duo-Therm AC models, this galvanized metal control box integrates with the original Comfort Control Center (CCC) thermostat system and includes all the wiring connections needed for 12V power, furnace control, load shed, and 120V hookup.
Finding a proper replacement control box for an older Duo-Therm air conditioner can be a challenge. This Dometic assembly (part number 3109226.005, vendor part 69-3450) is purpose-built for that job. It is not a generic retrofit -- it is the correct control box for a specific list of legacy Duo-Therm units and is engineered to work with the original Comfort Control Center thermostat.
The housing is galvanized metal for durability in the rooftop environment, and the kit ships with everything needed to complete the installation: the control box itself, a freeze control sensor, a mounting plate, and all required hardware.
Durable galvanized steel construction stands up to rooftop heat, vibration, and the demands of regular RV use.
Ships with freeze control sensor (3312303.005), mounting plate, 3 screws, and 4 bolts (3100895.006) -- no separate hardware order needed.
Includes wires for 12V power, furnace control, load shed circuit, and 120V AC power source for straightforward reconnection.
Compatible with over 25 specific older Duo-Therm AC model numbers -- see the full fitment list below before ordering.
The control box comes with pre-installed wiring leads for: 12V DC power supply, furnace interlock control, load shed (generator management), and 120V AC power input. These match the standard wiring scheme used across the compatible Duo-Therm unit lineup.
This control box assembly is confirmed compatible with the following Duo-Therm air conditioner model numbers:
Cross-reference your existing unit's model number -- found on the rooftop shroud label or inside the AC housing -- before ordering. If your model is not on this list, this part may not be the correct replacement.
This control box is designed for use with the original Duo-Therm Comfort Control Center (CCC) thermostat system. Confirmed compatible thermostat part numbers:
This control box will NOT work with Comfort Control Center 2 (CCC2) thermostats or any later-generation Dometic digital thermostat systems. If your coach has been upgraded to a CCC2 thermostat, this is not the correct control box. Verify your thermostat model before purchase.
The original CCC thermostat (compatible) typically features a simpler analog or early digital interface. The CCC2 thermostat features a larger LCD display and zone control capability. Check the model number printed on your thermostat faceplate or inside the battery compartment to confirm which system you have before ordering this part.