Dometic provides detailed installation instructions with your system, including a printed manual and a video guide. You should make sure you understand these instructions and follow them completely.
Note: The APU must be set to deliver 115 Volt 60 Hz output in order for the air conditioner to function properly. Check with your APU supplier.
The Dometic auxiliary air system comes with a standard digital thermostat/display unit. Operation is intuitive and easy, with up and down arrows to adjust the setpoint and fan speed.
To improve the air conditioner’s performance on a hot day, you can reduce the heat load by parking in a shaded area, covering windows with reflective shades to block out direct sunlight, and pulling the curtain between sleeper and cab. Make sure windows and doors are tightly closed, and turn off any other heat-producing appliances.
Operation and Maintenance
You should inspect and clean the air filter regularly to ensure good airflow across the evaporator coils. You will find the filter in the return air path, either directly behind the grill or in front of the evaporator coil.
- Make sure you do not block the airflow between the return air grill and evaporator coil with pillows, blankets, papers or other objects.
- Check the condensate drain often to make sure water is draining properly. Make sure the drain fittings do not get clogged.
- If you have a split system with external condensing unit, make sure you inspect and clean any debris from the condenser coil area to ensure good air flow.
Dometic’s auxiliary air systems, both self-contained and split, are designed so that you should never need to recharge the refrigerant loop under normal circumstances. If the refrigerant level ever needs to be adjusted, federal law requires that it must be done by an EPA-licensed HVAC technician with the proper tools to avoid accidental discharge of any refrigerant gas into the air. Occasionally check for chafe on outside wires and refrigerant lines (split systems).