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START-UP PROCEDURE
Start the furnace using the procedures in section
OPERATING YOUR FURNACE.
WARNING: Danger of bodily injury or death.
Liquefied petroleum propane gas is heavier than
air and it will settle in any low area, including open
depressions and it will remain there unless the area
is ventilated. Never attempt start-up of unit before
thoroughly ventilating 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.
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.
Under firing could cause inadequate heat, excessive
condensation or ignition problems. Over firing could
cause sooting flame impingement or overheating of the
heat exchanger.
Before starting natural gas input check, obtain heating
value of gas (BTU per cubic foot) at standard conditions
from your local supplier. This factor is used in "Check the
Gas Input" section and procedure.
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 rating plate of the furnace. For
elevations above 2,000 feet, the measured input must not
exceed the input on the rating plate reduced by 4 percent
for each 1,000 feet that the furnace is above sea level.
Gas supply pressure and manifold pressure with the
burners operating must also be as specified on the
rating plate.
TYPE OF GAS
NATURAL
PROPANE
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.
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 the manifold gas pressure. A "U Tube"
manometer having a scale range from 0 to 12 inches of
water should be used for this measurement. The manifold
pressure must be measured with the burner and pilot
operating. Any major changes in flow must be made by
changing the size of the burner orifice.
Check with your local gas supplier for proper orifice sizing.
CHECK THE GAS INPUT (NATURAL GAS ONLY)
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.
ADJUST PILOT BURNER
(STANDING PILOT MODELS ONLY)
PiIot fIame should surround 3/8 inch to 1/2 inch of the
thermocouple tip. To adjust, remove pilot adjustment
screw on gas valve. Turn screw counterclockwise to
increase flame, clockwise to decrease. Replace cap.
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
FIGURE 26 - THERMOSTAT
COUNTERFLOW TOP VENT GAS WALL HEATER
INDICATOR LOWEST SETTIG
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