Start-Up Procedure; Check Gas Input And Pressures; Check The Manifold Gas Pressure; Check The Gas Input - Williams 5508332 Owner's Manual

Start-Up Procedure
Start the furnace using the procedures in section
OPERATING YOUR FURNACE.
WARNING
DANGER OF BODILY INJURY OR DEATH.
LIQUIFIED PETROLEUM L.P. 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 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 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 NATIONAL
FUEL GAS CODE (NFPA-54) TO BE SURE THE FUR-
NACE IS BURNING FUEL AT THE PROPER RATE.
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 1000 Btu
per cubic foot and 34 seconds per cubic foot used as
determined by step (2), then:
Second per hour = 3,600
Input = 1,000 x 3,600 + 34 =106,000 BTU Per Hour
This measured input must not be greater than the in-
put indicated on the rating plate of the furnace.
4. Relight all other appliances turned off in step 1 above.
Be sure all pilot burners are operating.
Underfiring could cause inadequate heat, excessive conden-
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.
CHECK GAS INPUT AND PRESSURES
For furnace located at elevations 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
LP. 10.5
Rated input will be obtained on 2500 Btu propane at 10.5
inch manifold pressure with factory-sized orfices. If LP gas
having a different heating value is supplied, offices must
be changed by a qualified service technician before the
furnace is operated.
CHECK THE MANIFOLD GAS PRESSURE
A tapped opening is provided in the gas valve to facilitate
measuring the manifold gas pressure. A "U Tube"
ADJUST PILOT BURNER
(STANDING PILOT MODELS ONLY)
Pilotflame should surround 3/8 inch to 1/2 inch of the ther-
mocouple 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 temperature
shown on the thermostat, the main burner should light.
Make certain the thermostat turns off the furnace when
room temperature reaches the selected setting and starts
the furnace when room temperature falls a few degrees.
MAKE SURE THERMOSTAT ANTICIPATOR IS SET
PROPERLY, SEE PAGE 20.
THERMOSTAT (TYPICAL)
SEI"_G
--24 m