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I-SCE (09-18) PN207697R9
Table 19. Burner and Carryover Orifice Specifications
Model
Burner Orifice Carryover Orifice
Qty
Natural Gas Propane Gas Propane Gas
PN Drill Size PN Drill Size PN Drill Size
125 5 84437 #42 61652 1.45 mm 9870 #70
150 7 11833 #44 11830 #55 9680 #65
175 7 84437 #42 61652 1.45 mm 9680 #65
200 9 11828 #43 11830 #55 9680 #65
225 9 84437 #42 61652 1.45 mm 9680 #65
250 12 11833 #44 11830 #55 10370 #59
300 12 84437 #42 61652 1.45 mm 10370 #59
350 14 84437 #42 61652 1.45 mm 9791 #56
400 16 84437 #42 61652 1.45 mm 9791 #56
Natural gas units have a dual flash carryover system and do not require a carryover orifice.
Burner Carryover Systems: All natural gas burners, except when equipped with electronic modulation option AG39
or AG40, are equipped with two carryover systems—one on each end of the burner rack.
NOTE: Natural gas burner racks on furnaces manufactured before before Series 6 units have a
gas lighter tube carryover and one ash carryover.
All propane gas burners are equipped with one flash carryover and a regulated gas tube system. The carryover
lighter tube receives its gas supply through a regulator, simultaneously with the gas to the burner orifices.
During regular service, check the main burner ports, the carryover assemblies, and the orifices for cleanliness.
Typical natural gas and propane gas burner racks are shown in Figure 30.
Figure 30. Typical Burner Rack
BURNER AIR SHUTTERS
⚠ DANGER ⚠
Failure to adjust air shutters according to directions could cause property damage, personal injury,
and/or death.
Air shutters are required on propane gas units but are optional on natural gas units. A slotted burner air adjustment
screw on the end of the manifold bracket (see Figure 31) moves the air shutters and adjusts all burners simultaneously.
Turn the adjustment screw clockwise to open the air shutter or counterclockwise to close the air shutter.
After the furnace has been in operation for 15 minutes, close the air shutter until the flame turns yellow. Open the
shutter until yellow disappears.
Carryover Lighter Tube
Pilot
Carryover
Regulator
Flash
Carryover
Auxiliary
Flame
Probe
Propane Gas
Pilot
Pilot
Auxiliary
Sensor
Flash
Carryover
Flash
Carryover
Natural Gas
Pilot
NATURAL GAS BURNER RACK
(NOT APPLICABLE TO FURNACES WITH OPTION AG39 OR AG40)
BURNER RACK WITH PROPANE GAS PILOT
BURNERS, BURNER ORIFICES, AND CARRYOVER SYSTEM—CONTINUED
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