24
Burners and Igniters
MAIN BURNERS
To access burners, remove burner access panel and slide out burn-
er partition. At the beginning of each heating season, inspect for
deterioration or blockage due to corrosion or other causes. Ob-
serve the main burner flames and adjust, if necessary.
Orifice projection
Refer to Fig. 35 for maximum projection dimension for orifice
face to manifold tube.
Fig. 35 — Orifice Projection
Removal and Replacement of Gas Train
See Fig. 30, 34 and 36.
1. Shut off manual gas valve.
2. Shut off power to unit.
3. Slide out burner partition.
4. Disconnect gas piping at unit gas valve.
5. Remove wires connected to gas valve. Mark each wire.
6. Remove igniter wires and sensor wires at the Integrated Gas
Unit Controller (IGC). (See Fig. 37.)
7. Remove the 2 screws that attach the burner rack to the vesti-
bule plate (Fig. 34).
8. Slide the burner tray out of the unit (Fig. 36).
9. To reinstall, reverse the procedure outlined above.
Fig. 36 — Burner Tray Details
Fig. 37 — Unit Control Box/IGC Location
Cleaning and Adjustment
1. Remove burner rack from unit as described in Removal and
Replacement of Gas Train section.
2. Inspect burners; if dirty, remove burners from rack. (Mark
each burner to identify its position before removing from the
rack.)
3. Use a soft brush to clean burners and cross-over port as
required.
4. Adjust spark gap. (See Fig. 38.)
5. If factory orifice has been removed, check that each orifice is
tight at its threads into the manifold pipe and that orifice pro-
jection does not exceed maximum valve. See Fig. 35.
6. Reinstall burners on rack in the same locations as factory-
installed. (The outside crossover flame regions of the outer-
most burners are pinched off to prevent excessive gas flow
from the side of the burner assembly. If the pinched cross-
overs are installed between two burners, the flame will not
ignite properly.)
7. Reinstall burner rack as described in Removal and Replace-
ment of Gas Train section.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in premature wear
and damage to equipment.
When working on gas train, do not hit or plug orifice spuds.
ORIFICE
1.00-in
(25.4 mm)
MANIFOLD
PIPE
RACEWAY
INTEGRATED GAS UNIT
CONTROLLER (IGC)
HOLE IN END PANEL (HIDDEN)
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