Specifications

Heartland Owners Forum http://manuals.heartlandowners.org
Heating and Cooling Guide V1.pdf Page | 14 Version: 1, March 15, 2013
• Clean the outside coils.
Modifications to Improve Airflow Through A/C Ducts
The living room air conditioner sends much of the cold air through the main air dump, and the rest
through the duct system. Depending on the layout of the trailer, this can result in uneven distribution of
cold air. If the main air dump is further forward, the seating area at the very rear of the coach may not
get as much cold air as desired through the ceiling vents.
TimK Tent Modification
Several years ago, a Heartland owner devised a relatively simple modification that redirects airflow so
that more goes through the ceiling vents.
Here’s a link to the document that shows you how to add this
to your main air conditioner.
Closing the Bedroom Vents
During the day, closing the bedroom and bathroom vents helps to force more cold air out the living
room vents. Several owners have replaced the factory vents with adjustable vents that can be closed.
Here’s a link to the DwinCorp website. Click on the line drawing specifications to make sure you’re
ordering a compatible size.
Note that at night, you’ll probably want the vents open. The living room air conditioner usually sends
enough cold air into the bedroom that you don’t need the bedroom air conditioner on at night.
Cooling Starts and Stops Frequently
Check above the air intake for short-cycling where cold air leaks through gaps in the panel that
separates the main air dump from the warm air return. Use aluminum tape to seal gaps and leaks.
Air Conditioner Runs with Thermostat Set to HEAT Mode
The air conditioner blower runs continuously any time the thermostat’s fan setting is on HIGH or LOW –
even when the thermostat mode is set for HEAT. Cycle the Mode to FAN and use the + or – button to
change Fan speed to AUTO.
Air conditioner Won’t Start
• Check the thermostat settings. Cycle the mode to OFF. Then press the + or – button to display
the current temperature at the thermostat location. Cycle the mode back to COOL. Use the + or
- buttons to adjust the temperature set point to several degrees below the current temperature.
• Check the circuit breakers. When a circuit breaker trips, it moves slightly toward the off
position. If you run your fingers along the bottom edge of the circuit breakers, you can feel if
any of them are slightly out of place. To reset, flip the breaker to OFF and then back to ON.
• Check the DC fuse panel. On most panels, a red LED will illuminate next to a blown fuse. If you
suspect a blown fuse, carefully remove it and replace with a fuse of the same value.