24
Fig. 33 — Orifice Projection
REMOVAL AND REPLACEMENT OF GAS TRAIN
See Fig. 27, 32, and 34.
1. Shut off gas at the manual shut off located on the gas supply
line, then turn off gas valve switch located on gas valve (ON/
OFF).
2. Shut off power to unit and install lockout tag.
3. Disconnect gas piping at unit gas valve.
4. Remove wires connected to gas valve. Mark each wire.
5. Remove igniter wires and sensor wires at the Integrated Gas
Unit Controller (IGC). (See Fig. 35.)
6. Remove the 2 screws that attach the burner rack to the vesti
-
bule plate. (See Fig. 32.)
7. Slide the burner tray out of the unit. (See Fig. 34.)
8. To reinstall, reverse the procedure outlined above.
Fig. 34 — Burner Tray Details
CLEANING AND ADJUSTMENT
1. Remove burner rack from unit as described in Removal and
Replacement of Gas Train section, above.
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. The gap should be 0.12 to 0.14-in. (3.06 to
3.60 mm) and spaced 0.18-in. (4.60 mm) from the end of the
burner. (See Fig. 36.)
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. 33).
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.
Fig. 35 — Unit Control Box/IGC Location
ORIFICE
1.00-in
(25.4 mm)
MANIFOLD
PIPE
3
2
1
1
ITEM NUMBER
DESCRIPTION
1
Gas Manifold Mounting Screws (qty 2)
2
Gas Valve Inlet Plug
3
Propane Conversion Label
(apply label where indicated)
4
Gas Manifold Pressure Tap
IGC Bo
a
rd
IGC Bo
a
rd
