
5
Propane Furnaces Only
For furnaces operating on propane gas, please review the
following warnings before use.
WARNING
PERSONAL INJURY HAZARD
To avoid death, personal injury or property
damage due to explosion or fire, install a gas
detecting warning device. Since the odorant
in propane gas can be reduced by iron ox-
ide (rust), a gas detecting warning device is
the only reliable method to detect propane
gas leaks.
WARNING
PERSONAL INJURY HAZARD
If the gas furnace is installed in a basement,
an excavated area or a confined space, it is
strongly recommended to contact a propane
supplier to install a gas detecting warning
device in case of a gas leak.
• Since propane gas is heavier than air, any
leaking gas can settle in any low areas or
confined spaces.
• Propane gas odorant may fade, making
the gas undetectable except with a warn-
ing device.
An undetected gas leak will create a danger
of explosion or fire. If the presence of gas is
suspected, follow the instructions on the
cover of this manual. Failure to do so could
result in SERIOUS PERSONAL INJURY OR
DEATH.
II. Operation
Thermostat
This furnace requires a two stage thermostat. A two stage
thermostat controls which firing rate is used depending on
the temperature difference between the set point and the
room temperature. If the difference is small, the thermostat
will energize the furnace on the low stage. If the tempera-
ture difference is high, the thermostat will energize the fur-
nace on high stage. A two stage thermostat and furnace
properly used will maintain a much tighter control of tem-
perature than a conventional single stage thermostat and
furnace.
For optimal operation of this furnace, set the thermostat to
the temperature desired. Do not overadjust the thermostat to
turn the heat on. This will cause the high stage heat to come
on when the low stage heat could have satisfied the demand.
Setting the temperature to the desired temperature will
minimize temperature fluctuations.
In addition there are thermostats that automatically switch
from Heating to Cooling and with night setbacks. The night
set-back, or multiple set-back type, will lower the tempera-
ture at night or during the day when no one is at home, sav-
ing energy and lowering fuel bills.
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.
General Information
This furnace is equipped with an electronic ignition device
which lights the burners. It also has an induced draft blower
to draw combustion air into the heat exchanger.
Keep both doors in place except for inspection and mainte-
nance. An interlock switch prevents furnace operation if the
blower door is not in place.
Do not use this furnace if any part has been under water.
Immediately call a qualified servicer to inspect the furnace
and to replace any part of the control system and any gas
control which has been under water.
WARNING
PERSONAL INJURY HAZARD
To avoid death, personal injury or property
damage do not remove any internal com-
partment covers. Electrical components are
contained in both compartments. Contact a
qualified servicer at once if an abnormal
condition is noticed.
Operating Instructions
1. Close the manual gas valve external to the furnace.
2. Turn off the electrical power supply to the furnace.
3. Set room thermostat to lowest possible setting.
4. Remove the door on the front of the furnace.
5. This furnace is equipped with an ignition device to auto-
matically light the burners. Do not try to light burners by
hand.
6. Turn the gas control knob clockwise to the Off
position (Figure 2). The knob should turn easily. Do not
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