Furnace User Manual 2019
5
Outdoor Humidity
Temperature Single -Paned Double-Paned
Glass Glass
+30°F 30% 50%
+20°F 20%
40%
+10°F 15% 35%
0°F 10% 30%
-10°F 5% 25%
-20°F 5% 20%
-30°F 3% 18%
For furnaces operating on propane gas, please review the
following warnings before use.
WARNING
WARNING
WARNING
There are many types and styles of thermostats but
operation is usually similar. BE SURE TO BECOME
FAMILIAR WITH YOUR THERMOSTAT. The simplest type
of thermostat only starts and stops the furnace to maintain
the desired room temperature. The most widely used
types will control both heating and cooling functions and
will have a Fan Switch with Auto and ON settings. On Auto,
the circulating air blower will cycle on/o with the furnace
but if switched to ON it will run continuously regardless of
whether or not heating or cooling is being provided.
In addition, there are thermostats which automatically
switch from heating to cooling mode and those with night
set back capability. The night set back, or multiple set
back, type allows for a dierent temperature at night or
during the day when no one is at home. Programmable
thermostats will allow for more control and tailoring of the
heating and cooling functions. The level of this control
depends on the type of thermostat applied.
Fan Switch
Cool/Heat
Switch
Cool/Heat
Temperature
Control Dials
Room Temperature
Thermostat
System
Switch
Fan
Switch
Action
OFF AUTO
None
COOL AUTO
System only cools, fan
cycles off and on.
COOL ON
System only cools, fan
runs all the time.
HEAT AUTO
System only heats, fan
cycles off and on.
HEAT ON
System only heats, fan
runs all the time.
OFF ON
No heating or cooling,
fan runs all the time.