Specifications
Heartland Owners Forum http://manuals.heartlandowners.org
Heating and Cooling Guide V1.pdf Page | 7 Version: 1, March 15, 2013
Analog Thermostat Wiring
There is an informal or “loose” wiring standard for thermostats, but exact terminal functions can vary
from manufacturer to manufacturer. Yours may be different, or use different color wiring, but the basic
functions will be similar. You can rely more on the terminal designations than you can the wiring colors
for wiring or troubleshooting.
Here is a typical chart for the thermostat and equipment terminals in your RV. This may help you in
diagnosing or troubleshooting.
Terminal Color Description
R
Red
12 volt DC (+)
RH / RC Red 12 volt DC (+) HEAT / COOL
W / W1 White Heat (Furnace)
W2 White Backup Heat
Y / Y1
Yellow
A/C Compressor
G Green A/C Fan low-speed
O / OB
Orange
Reversing valve (Heat Pump)
B Blue A/C Fan high-speed
Digital thermostats may have fewer wires going into the thermostat. Some of the remaining control
wires may be located in the relay box above the air intake.
Air Conditioner Operation
Living Room Air Conditioner
The living room air conditioner is usually a 15,000 BTU unit that pumps cold air through a main air dump
that has an adjustable grill. Some of the cold air is also routed through ceiling ducts with registers in the
living room, kitchen, bathroom, and bedroom. The main air dump can be left wide open, spilling most
of the air in the area nearest to the air conditioner. Even when fully open, some air will get through the
ducts to the registers in other areas. You may want to experiment with how to set the grills for best
cooling.
Do You Need the Optional Bedroom Air Conditioner
In mild climates, the living room air condition may be satisfactory to cool the entire coach. Most owners
agree that in hot climates, the optional bedroom unit is required to maintain comfortable temperatures.
What You Can Expect from the Air Conditioners
Cooling load is based on temperature and humidity inside your coach, and the cooling capacity of the
A/C varies based on temperature outside the coach. Having your fan set on high or low speed will affect
the capacity of the unit and the temperature of the discharge air also.