Sears 867.736349 Owner's Manual page 16

KNOB
,GAS CONTROL
GA$ COCK POSIT|ON PILOT
INDICATOR ADJUSTING
SCREW COVER
t, Remove the screw cover over the pilot adjusting
screw (Fig. 26).
2. Insert a small screwdriver and adjust flame as
needed. Turn screw clockwise (--_)to decrease
flame. Turn counterclockwise (---):to increase
flame.
3. Turn the thermostat to its highest setting. The
main burner should light quickly and smoothly.
Turn the thermostat to its lowest setting. Main
burner shoutd go out. Pilot should remain lit.
4. Replace the pilot adjusting screw cover,
CHECK GAS INPUT AND PRESSURES
Push Hi-Lo knob on gas valve down (Fig. 26). This
sets pressure for highest firing rate.
Gas input to the burners must not exceed the rated
input shown on the rating plate below the burner.
Gas manifold pressure with the burner on high fire
must be as shown on the rating plate.
Gas supply pressure must be at least 5" water
column for Natural gas and 11" water column for L.P.
gas. it must not be more than 14" water column for
Natural gas or LP gas.
,MAIN BURNER ADJUSTMENT
[I-LO
NOB
I
These points must be checked by a qualified service
technician. He should make any changes or
adjustments necessary. Failure to have this done
cou!d result in premature furnace failure, or
unsatisfactory or possibly hazardous furnace oper-
ation.
ADJUST AIR FOR BURNERS
When the furnace is lighted the first time, the air to
each burner will have to be adjusted, A proper
setting of the air shutter (Fig. 28) gives a soft, blue
flame with no yellow tips.
1. Set thermostat to highest setting.
2. Loosen the wing screw that holds the air shutter
(Fig. 28).
3. Turn the air shutter counterclockwise ((-',) until
the flame has yellow tips. Turn clockwise (,-J)until
the yellow tips just disappear (Fig. 27).
4 . Tighten wing screw to hold the shutter in place.
AIR SHUTTER
ROTATE AIR SHUTTER IN ORDER
TO GET PROPER AIR MIXTURE
/
IMPROPER FLAME PROPER FLAME
ADJUSTMENT ADJUSTMENT
CHECK THERMOSTAT
Check the thermostat, when it is set above
temperature shown on the thermometer, furnace
burner should light. Be sure the thermostat turns off
the furnace when room temperature reaches the
selected setting and starts the furnace when room
temperature falls a few degrees.
Set the thermostat for the desired temperature.
CORRECT
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TOO MUCH AIR, CONES BRIGHT
INNER CONES LIGHT BLUE POINTED TOP
OUTER MANTLE LIGHT BLUE
PROPER FLAME 'l/2" TO _1/4" HIGH
BLUE AND REAL SHARP POINTS
INSUFFICIENT AIR -- LON_ OPEN
END CONES, YELLOW IN COt.OR
15