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Start-Up
Procedure
Start
the furnace
using
the
procedures
in section
OPERATING YOUR FURNACE. Pages 19 thru 24.
WARNING
DANGER OF PROPERTY DAMAGE,
BODILY INJURY OR DEATH.
LIQUIFIED
PETROLEUM
L.IR 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 STARTUP OF UNIT BEFORE
THOROUGHLY
VENTILATING AREA.
CHECK THE GAS INPUT (NATURAL GAS ONLY)
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 (NFPA-54) TO BE
SURE THE FURNACE IS BURNING FUEL AT THE
PROPER RATE.
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.
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 burn-
ers operating must also be as specified on the rating plate.
Type of Gas
Manifold Pressure, In. W.C.
|
Natural
4
]
L.P.
10.5
Rated input will be obtained on 2500 Btu propane at 10.5
inch manifold pressure with factory-sized orifices. If LP gas
having a different heating value is supplied, orifices must
be changed by a qualified service technician before the
furnace is operated.
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.
SURE TH_
ANTICIPATOR IS SET PROPERLY
ADJUST PILOT BURNER
NOTE
STANDING PILOT MODELS ONLY
Pilot flame should surround 5/8 to 1/2 inch of the
thermocouple tip. To adjust, remove cap from pilotad-
justing screw on gas valve. Turn screw counterclock-
wise to increase flame, clockwiseto decrease. Replace
cap. See Figs, 31, Page 25 and Fig. 32, Page 26.
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.
Underfiring could cause inadequate heat, excessive con-
densation or ignition problems. Overfiring could cause
sooting
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:
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 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.
4. Relight all other appliances turned off in step 1 above.
Be sure all pilot burners are operating.
THERMOSTAT (TYPICAL)
SQUEEZE
FIRMLY
BOTH SIDES
AND LIFT TO
REMOVE COVER
WARNING
DANGER OF IGNITION FLASH
AND EYE INJURY OR BLINDNESS
PROTECT YOUR EYES. NEVER ATTEMPT TO
LIGHT PILOT WITH GAS CONTROL VALVE KNOB
IN
"ON"
POSITION.
FLASH
BACK COULD
OCCUR.
--18--
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