Start-Up Procedure
Start the furnace using the procedures in section CHECK THE GAS INPUT (NATURAL GAS ONLY) Operating Your Furnace on pages 15 through 19.
WARNING
DANGER OF BODILY INJURY OR DEATH
LIQUEFIED PETROLEUM (L.E) GAS IS HEAVIER THAN AIR AND IT WILL SETTLE IN ANY LOW
AREA, INCLUDING OPEN DEPRESSIONS AND IT WILL REMAIN THERE UNLESS AREA IS VENTILATED.
NEVER ATTEMPT
Check the furnace operation as outlined in the following instructions• If any sparking, odors or unusual noises are encountered, shut off electrical power immediately. Recheck for wiring errors, or obstructions in or near op- tional blower motor•
NOTICE:
During the initial firing of this unit some smoke and odor may occur• We recommend ventilating the area during this initial "break in period."
CHECK GASlNPUT AND PRESSURES
For furnace located at altitudes between sea level and 2000 feet, the measured input must not be greater than the input shown on the rating plate of the furnace. For elevations above 2000 feet, the measured input must not exceed the input of the rating plate reduced by 4 percent for each 1000 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 MANIFOLD PRESSURE, IN. W.C.
Natural | 4 |
L.R | 11 |
WARNING
NATURAL GAS HEATING VALUE (BTU PER CUBIC
FOOT) CAN VARY SIGNIFICANTLY, THEREFORE, IT IS THE INSTALLER'S RESPONSIBILITY TO SEE
THAT BTU INPUT TO THE FURNACE IS ADJUSTED PROPERLY. FAILURE TO DO SO COULD CAUSE HEAT EXCHANGER FAILURE, ASPHYXIATION, FIRE OR EXPLOSION, RESULTING IN DAMAGE, BODILY INJURY OR DEATH. REFER TO THE NATURAL
FUEL GAS CODE
Underfiringcould cause inadequate heat, excessiveconden- sation or ignition problems. Overfiring could cause soot- ing flame impingement or overheating of 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.
To measure the input using the gas meter, proceed as follows:
Step 1: Turn off gas supply to all other appliances except the furnace.
Step 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. (3,600 = Sec. Per Hr.) This gives the
seconds per cubic foot of gas being delivered to
• the furnace.
Step 3: Assuming natural gas with a heating value of 1000 Btu per cubic foot and 34 seconds per cubic foot as determined by step (2), then:
Input: 1,000 X 3,600 + 34 = 106,000 Btu Per Hour
This measured input must not be greater than the input indicated on the rating plate of the furnace.
Step 4: Relight all other appliances turned off in step 1 above. Be sure all pilot burners are operating.
ADJUST PILOT BURNER
Rated input will be obtained on 2500 B'FUpropane at 11 inches manifold pressure with
NOTE: Pilot gas may need adjustment depending on inlet pressure, increase or decrease to obtain proper setting.
Pilot flame should surround 3/8 inch to 112inch of the ther-
mocouple tip. To adjust, if needed, remove pilot adjustment cap (do not lose gasket).
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 the flow must be made by changing the size of the burner orifice. Check with local gas company for proper orifice size.
m14m
1, Remove screw cover over pilot adjusting screw.
2.Insert small screwdriver. Adjust flame as needed. Turn screw counterclockwise
clockwise (_) to decrease.
3.Turn thermostat to highest setting. Main burners should light quickly and smoothly. Turn thermostat to lowest setting. Main burners should go out. Pilot should re- main lighted.
4.Replace screw cover over pilot adjusting screw.
