Bryant Outdoor Heating Unit 379A User Manual Page 7
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and turn gas pressure adjusting screw counter
clockwise.
Checking Propane Gas input
The burner orifices are sized for rated input with a
manifold pressure of 11.0” w.c. for propane gas. Con
nect a manometer to the 1/8" pressure tap on the gas
manifold. With the burners fired, adjust regulator at
the supply tank to provide a pressure of 11.0" w.c.
Air Shutter Ad|ystmerit
To adjust the primary air to each burner, partially
close tire air shutter until there is a slight yellow tip
on the top of the ñame, then open the air shutter until
the yellow tip just disappears. This should be done af
ter the burners have been operating at full input for 5
or 10 minutes (approximately).
Airflow and Temperature Rise
The furnace is designed for operation within a tem
perature rise of 45 °F to 75 °F, all against an external
static pressure up to 0.5 inch water column.
The external static pressure against which the blower
is operating is the difference in pressures in the return
air duct and discharge air duct near the furnace.
An adjustable flange on the blower motor pulley is
used to adjust the blower speed. Proceed as described
below to adjust blower motor speed.
WARNING: Turn off power at disconnect switch
before removing blower belt.
1. Refer to Figure 5. Loosen the belt tensioning ad
justing screw until there is slack in belt. Remove belt
from pulleys.
2. Loosen setscrew in movable flange of blower motor
pulley. Screw movable flange toward fixed flange to
increase blower speed, and away from fixed flange to
reduce blower speed. Tighten set screw on one of the
two flat surfaces on the pulley hub.
GAUTION: Increasing the blower speed will impose
a greater load on the blower motor. Do not exceed
the rated current draw of the motor.
3. Replace belt and adjust for proper tension. The belt
should have approximately a 3/4-inch sag under nor
mal finger pressure midway between pulleys.
4. Check motor pulley and blower pulley for proper
alignment.
VIII. MAINTENANCE
Blower Motor Lubrication
Lubricate the blower motor per oiling label located in
blower compartment. See Figure 5.
Cleaning the Heating Section
1. Turn off power at main disconnect switch.
WARNING: Tag switch with suitable warning label.
2. Remove front access panel.
3. Turn off manual gas valve and pilot gas cock.
4. Disconnect pilot and escapement tubing.
5. Remove burners.
6. Remove flue baffle retainer and vent section shelf.
7. Remove flue baffle.
8. Clean passages with suitable brush.
9. Reassemble furnace by reversing above procedure.
Filters
Every two months throughout the heating season,
remove and inspect air filters for clogging due to dirt.
When necessary, replace disposable filters or clean
permanent type filters using clear water. Be sure to
coat permanent filters with a water-soluble oil after
cleaning if instructions require it.
LEGEND
IB - Transformer
2A - Blower Fan Relay (Cooling)
2G - Blower Fan Relay (Heating)
3A - Blower Motor
5B - Magnetic Gas Valve
6B - Reignition Piiot
7K - Hi-Temp Limit
7P - Pilot Pressure Switch
11A - Resistor
Figure 7—Models 48W- and 60W-379A Wiring Diagram
— 7 —
39379D36
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