Many RV enthusiasts love to explore the world in their motorhomes or travel trailers. However, the comfort of an RV depends on the efficiency of its heating and cooling systems. To regulate the temperature, Dometic has introduced a range of Duo Therm thermostats that work seamlessly with an RV’s HVAC system. In this article, we’ll discuss the wiring diagram of Duo Therm by Dometic thermostat and how you can install it without any hassle.
What is a Duo Therm thermostat?
Duo Therm is a well-known brand in the RV industry that specializes in manufacturing thermostats for RV heating and cooling systems. Although there are various models available, the most common ones are the analog and digital thermostats.
The analog thermostat is easy to understand, and it uses a dial to regulate the temperature. On the other hand, the digital thermostat is more advanced and comes with a touch screen display that shows the current temperature, set temperature, and other features.
No matter what type of Duo Therm thermostat you own, understanding its wiring diagram is crucial to ensure that it works correctly.
Wiring diagram for Duo Therm by Dometic thermostat
The wiring diagram for a Duo Therm thermostat depends on the model and the HVAC system installed in your RV. However, some common wiring configurations are as follows:
Wiring for a Single Zone LCD Thermostat (Dometic Part# 3313189.XXX)
If you have a single zone LCD thermostat, the wiring diagram will look like this:
| Wire Color | Description | Terminal |
|---|---|---|
| Red | 12V positive supply | RC |
| Yellow | Compressor | Y |
| Green | High fan | GH |
| Blue | Ground | – |
| White | Low fan | GL |
It’s important to note that the RC and RH terminals are jumpered together on this thermostat, so you only need to connect the 12V positive supply to the RC terminal.
Wiring for a Single Zone LCD Thermostat (Dometic Part# 3313192.XXX)
If you have a single zone LCD thermostat with heat pump capability, the wiring diagram will look like this:
| Wire Color | Description | Terminal |
|---|---|---|
| Red | 12V positive supply | RC |
| Yellow | Compressor | Y |
| Green | High fan | GH |
| Blue | Ground | – |
| White | Low fan | GL |
| Orange | Reversing valve for heat pump | O/B |
| Brown | Auxiliary heat | W |
As you can see, this thermostat has additional terminals for the reversing valve and auxiliary heat, which are required for heat pump systems.
Wiring for a Multi-Zone CCC Thermostat (Dometic Part# 3312024.XXX)
If you have a multi-zone CCC thermostat with three or four zones, the wiring diagram will look like this:
| Wire Color | Description | Terminal |
|---|---|---|
| Red | 12V positive supply (zone 1) | RC |
| Yellow | Compressor (zone 1) | Y1 |
| Green | High fan (zone 1) | GH |
| Blue | Ground | – |
| White | Low fan (zone 1) | GL |
| Purple | 12V positive supply (zone 2) | RC |
| Tan | Compressor (zone 2) | Y2 |
| Orange | High fan (zone 2) | GH |
| Gray | Low fan (zone 2) | GL |
| Black | 12V positive supply (zone 3) | RC |
| Light Blue | Compressor (zone 3) | Y3 |
| Yellow/Green | High fan (zone 3) | GH |
| Pink | Low fan (zone 3) | GL |
| White/Black | 12V positive supply (zone 4) | RC |
| Gray/Black | Compressor (zone 4) | Y4 |
| Orange/Black | High fan (zone 4) | GH |
| Tan/Black | Low fan (zone 4) | GL |
The multi-zone CCC thermostat is more complex and requires additional wiring for multiple zones. Therefore, it’s recommended to seek professional help if you’re unsure about installing this type of thermostat.
FAQs
Q. Can I install a Duo Therm thermostat myself?
A. Yes, you can install a Duo Therm thermostat yourself if you have basic knowledge of electrical wiring. However, if you’re unsure about the wiring or installation process, it’s recommended to seek professional help.
Q. How do I know which wiring diagram to follow?
A. The wiring diagram you should follow depends on the type of Duo Therm thermostat you have and the HVAC system installed in your RV. Refer to the user manual or seek professional help if you’re unsure.
Q. Why is it essential to understand the wiring diagram of a Duo Therm thermostat?
A. Understanding the wiring diagram of a Duo Therm thermostat ensures that it’s installed correctly and working efficiently. Accidentally connecting the wrong wires can damage the thermostat or the HVAC system of your RV.
Q. What if my wiring diagram looks different from the ones mentioned in this article?
A. The wiring diagram for a Duo Therm thermostat can vary depending on the model and the HVAC system. Refer to the user manual or seek professional help if you’re unsure about your wiring diagram.
Q. Can I use a Duo Therm thermostat with a different brand of HVAC system?
A. No, it’s recommended to use a Duo Therm thermostat with a Duo Therm HVAC system for optimal performance. Using a different brand of thermostat or HVAC system can cause compatibility issues and affect the efficiency of the system.
Conclusion
Installing a Duo Therm thermostat in your RV’s HVAC system can improve its performance and provide you with a comfortable RV experience. However, it’s crucial to understand the wiring diagram of your thermostat to ensure it’s installed correctly. By following the correct wiring diagram and seeking professional help if necessary, you can enjoy the benefits of a well-functioning HVAC system in your RV.
