Carrier 48HC D17 Series Service And Maintenance Instructions page 45

CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution can result in personal
injury.
Disconnect all electrical power when servicing the gas
train. Apply appropriate lockout/tag- - out procedures.
4. Disconnect gas piping at unit gas valve.
5. Remove wires connected to gas valve. Mark each
wire to assist in re- - connecting power to the gas valve.
6. Remove igniter wires and sensor wires at the Integ-
rated Gas Unit Controller (IGC). See Fig. 57.
7. Remove the 2 screws that attach the burner rack to
the vestibule plate. See Fig. 55.
SCREWS
BURNER
ASSEMBLY
MANIFOLD
PRESSURE TAP
Fig. 55 - - Burner Assembly Removal
1
Item No. Description
1 Gas Manifold Mounting Screws (qty 2)
2 Gas Valve Inlet Plug
Propane Conversion Label
3
(apply label where indicated)
4 Gas Manifold Pressure Tap
Fig. 56 - - Burner Tray Details
VESTIBULE
PLATE
GAS VALVE
C12594
C09395
8. Slide the burner tray out of the unit. See Fig. 56.
9. To reinstall, reverse the procedure outlined above.
Cleaning and Adjustment
1. Remove burner rack from unit as described in Re-
moval 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- - 0.14"
(3.06- - 3.60 mm) and spaced 0.18" (4.60 mm) from the
end of the burner. See Fig. 59.
5. If factory orifice has been removed, check that each
orifice is tight at its threads into the manifold pipe
and that orifice projection does not exceed maximum
valve. See Fig. 54.
6. Reinstall burners on the rack in the same locations as
they were installed at the factory. The outside
crossover flame regions of the outermost burners are
pinched off to prevent excessive gas flow from the
side of the burner assembly. If the pinched crossovers
are installed between two burners, the flame will not
ignite properly.
7. Reinstall burner rack as described in Removal and
Replacement of Gas Train section.
45