Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 32)

Form I-SC, P/N 207696 R11, Page 32
8.0 Controls
(cont'd)
8.6 Burners, Orifices, and Carryover System
Burners - Individually formed steel burners capable of operating on either natural or
propane gas are used in this heater. These burners have accurate, machine-formed
ports to give controlled flame stability and operation without lifting or flashback. All
burners are lightweight and factory mounted in an assembly which permits all of the
burners to be removed as a unit for inspection or service.
Burner Carryover Systems - All natural gas burners (except when equipped with
electronic modulation Option AG39 or AG40) are equipped with two flash carryover
systems, one on each end of the burner rack. (NOTE: A natural gas burner rack on
furnaces manufactured prior to Series 6 had a gas lighter tube carryover and one flash
carryover.)
Carryover Lighter Tube
Pilot Carryover
Regulator
Flash
Carryover
FIGURE 32B - Burner Rack With a Pilot for
Propane
Auxiliary
Flame
Probe
Propane Pilot
Pilot
Auxiliary
Sensor
Flash
Carryover
Flash
Carryover
FIGURE 32A - Natural Gas Burner Rack (does
not apply to furnaces with Option AG39 or
AG40)
Natural Gas
Pilot
Model SC Size 100 125 150 175 200 225 250 300 350 400
Burner
Orifices
Qty 4 5 7 7 9 9 12 12 14 16
Natural
Gas
Drill Size #41 #42 #44 #42 #43 #42 #44 #42 #42 #42
P/N 11792 84437 11833 84437 11828 84437 11833 84437 84437 84437
Propane
Drill Size 1.45 mm 1.45 mm #55 1.45 mm #55 1.45 mm #55 1.45 mm 1.45 mm 1.45 mm
P/N 61652 61652 11830 61652 11830 61652 11830 61652 61652 61652
Carryover
Orifice
Propane
Drill Size #70 #70 #65 #65 #65 #65 #59 #59 #56 #56
P/N 9870 9870 9680 9680 9680 9680 10370 10370 9791 9791
FIGURE 33 - Propane
Burner Rack Showing
Burner Air Shutter
Adjustment Screw
Burner Air Shutter
Adjustment
Screw
All propane gas burners are equipped with one flash carryover and a regulated gas
lighter tube system. The carryover lighter tube receives its gas supply through a regu-
lator, simultaneously with the gas to the burner orifices.
During regular service, check the main burner ports, the carryover assemblies, and the orifices for cleanliness.
Burner Orifices - Heaters are shipped with orifices of proper size and type for gas specified. NOTE: Natural gas units
have a dual flash carryover system and do not require a carryover orifice.
Burner Air Shutters - Air shutters are required on propane units, optional on natural units. A slotted screw on the end
of the manifold bracket moves air shutters and adjusts all burners simultaneously (See FIGURE 33). Turning the screw
clockwise opens the air shutter; counterclockwise closes shutter.
After the furnace has been in operation for 15 minutes, close air shutter until the flame turns yellow. Open shutter until
yellow disappears.
DANGER
Failure to adjust air shutters
according to directions
could cause property
damage, personal injury, and
or death.