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507964-01 9/2019
8- Restore electrical power and gas supply. Follow lighting
instructions attached to unit and use inspection port in
access panel to check flame.
WARNING
Danger of explosion.
Can cause injury or death.
Do not overtighten main burner
mounting screws. Snug tighten only.
BURNER BOX ASSEMBLY - 036 & 060 UNITS
FIGURE 39
GAS
VALV
E
BURNERS
GAS
MANIFOLD
BURNER BOX
TOP CAP
REMOVE INDIVIDUAL BURNERS ON
OLDER UNITS; REMOVE THE ENTIRE
BURNER ASSEMBLY ON NEWER UNITS
GAS
MANIFOLD
BURNER BOX ASSEMBLY - 120 & 240 UNITS
FIGURE 40
GAS
VALVE
BURNER BOX
TOP CAP
FIGURE 41
IGNITOR AND SENSOR POSITION
036 & 060 UNITS
150,000 BTUH - 7 BURNERS
108,000 BTUH - 5 BURNERS
SENSOR IGNITOR
SENSOR IGNITOR
70,000 BTUH - 3 BURNERS
SENSOR IGNITOR
D-Combustion Air Inducer (SG Units)
A combustion air proving switch checks combustion air
inducer operation before allowing power to the gas
controller. Gas controller will not operate if inducer is
obstructed.
Under normal operating conditions, the combustion air
blower wheel should be checked and cleaned prior to the
heating season. However, it should be examined periodically
during the heating season to establish an ideal cleaning
schedule. With power supply disconnected, the condition of
the blower wheel can be determined by looking through the
vent opening.
TABLE 36
Dimension
Unit
Btuh Input
Length - in. (mm)
Ignitor Sensor
A 130/260K 7-3/4 (197) 11 (279)
B 180/360K 5 (127) 5-1/2 (140)
C 240/480K 2-1/4 (57) 2-3/4 (70)
FIGURE 42
IGNITOR
SPARK GAP SHOULD
BE 1/8” (3mm)
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