Specifications

Heartland Owners Forum http://manuals.heartlandowners.org
Heating and Cooling Guide V1.pdf Page | 4 Version: 1, March 15, 2013
Heating & Cooling Guide
This guide is based on the Dometic Thermostats and Air Conditioners, and Suburban Furnaces
commonly found in most Heartland RVs.
Thermostats
The living room thermostat is the primary control for either your living area air conditioner (or heat
pump), and your furnace. The bedroom thermostat controls only the bedroom A/C or heat pump. The
thermostat simply makes or breaks electrical connections in response to what you want it to do (based
on operating mode and set point) and what the temperature in coach actually is. Heartland has used
several types of thermostats in their production, and many owners have performed modifications to use
after-market digital or programmable thermostats.
Dometic Single Zone LCD Thermostat
Depending on which model is installed in your RV,
you may have either three or four modes of
operation. Fan/Cool/Furnace are present on all
thermostats, but the control for Heat Pump or Heat
Strip is not needed unless you have those optional
components.
The button labeled “On/Off Mode” is used to cycle
through the modes. One of the LEDs will light to
indicate to which mode the thermostat is set. If no
LEDs are lit, the thermostat is OFF.
Fan Mode: Allows you to set the fan to HIGH, LOW
or AUTO. It’s usually best to leave this set on AUTO.
Cool Mode: Use the On/Off Mode switch to cycle the thermostat to Cool Mode. If the air temperature
at the thermostat is warmer than the set point showing in the LCD display, the air conditioner will start.
Furnace Mode: When cycled to Furnace, furnace operation is enabled. If the air temperature at the
thermostat is lower than the set point showing in the LCD display, the furnace will start.
NOTE: If the fan is set to HIGH or LOW, the overhead A/C blower will run continuously, including
when you set the thermostat to HEAT mode.