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Start-Up Procedure
WARNING: Danger of property damage, bodily
injury or loss of life. propane gas is heavier than air and
may settle in any low area, including open depressions
and may remain there unless area is ventilated. Never
attempt start&up of unit before thoroughly ventilating
the area.
Check the furnace operation as outlined in the following
instructions. If any sparking, odors or unusual noises
are encountered, shut off electric power immediately.
Recheck for wiring errors or obstructions in or near fan
motor (if equipped).
WARNING: Natural gas heating value (BTU per
cubic foot) can vary significantly. Therefore, it is the
installer's responsibility to see that BTU/hr. input to
the furnace is adjusted properly. Failure to do so could
cause combustion chamber failure, asphyxiation, fire or
explosion resulting in damage, bodily injury or death.
Refer to the National Fuel Gas Code (NFPA 54) to be
sure the furnace is burning fuel at the proper rate.
CHECK GAS INPUT AND PRESSURES
For furnaces located at elevations between sea level and
2,000 feet, the measured input must not be greater than
the input shown on the nameplate of the furnace. For
elevations above 2,000 feet, the measured input must not
exceed the input on the nameplate reduced by 4 percent
for each 1,000 feet that the furnace is above sea level.
Gas supply pressure and manifold pressure with the
burner(s) operating must also be as specified on the
nameplate.
Rated input will be obtained on a heating value of 2,500
BTU/hr. for propane at 10-inches manifold pressure with
factory-sized orifices. If propane gas having a different
heating value is supplied, orifices must be changed by a
qualified service technician before the furnace is operated.
TYPE OF GAS
NATURAL
PROPANE
CHECK GAS CONTROL VALVE WIRE CONNECTIONS / GAS CONTROL VALVE WIRIG - P323011 OR P322660
MANIFOLD PRESSURE, IN. W.C.
4.0
10.0
CHECK THE MANIFOLD GAS PRESSURE
A tapped opening is provided in the gas valve to facilitate
measuring manifold gas pressure. A water column
manometer having a scale range from 0 to 12-inches of
water column should be used for this measurement. The
manifold pressure must be measured with the burner and
pilot operating. Any major changes in the flow must be
made by changing the size of the burner orifice.
CHECK THE GAS INPUT (NATURAL GAS ONLY)
Under firing could cause inadequate heat, excessive
condensation or ignition problems. Over firing could
cause shooting flame impingement or overheating of the
combustion chamber. Before starting natural gas input
check, obtain the heating value of gas (BTU per cubic foot)
at standard conditions from your local gas supplier.
To measure the input, using the gas meter, proceed
as follows:
1. Turn off gas supply to all other appliances except
the furnace.
2. With the furnace operating, time the smallest dial on the
meter for one complete revolution. If this is a 2-cubic-
foot dial, divide the seconds by 2. If it is a 1-cubic-foot
dial, use the time in seconds as is. This gives the seconds
per cubic foot of gas being delivered to the furnace.
3. Assuming natural gas with a heating value of 1,000 BTU
per cubic foot and 34-seconds per cubic foot used as
determined by step (2), then:
Seconds per hour = 3,600
Input = 1,000 x 3,600 / 34 = 106,000 BTU/hr.
This measured input must not be greater than the
input indicated on the nameplate of the furnace.
4. Relight all other appliances turned off in Step 1 above. Be
sure all pilots are operating.
CHECK THERMOSTAT
Check thermostat operation. When set above room
temperature shown on the thermostat, the main burner
should light. Make certain the thermostat turns off the
furnace when the room temperature reaches the selected
setting and starts the furnace when room temperature falls a
few degrees below the thermostat setting.
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