45
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.
CAUTION
!
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.
BURNER
ASSEMBLY
GAS VALVE
VESTIBULE
PLATE
SCREWS
MANIFOLD
PRESSURE TAP
~
C12594
Fig. 55 -- Burner Assembly Removal
4
3
2
1
1
C09395
Item No.
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
Fig. 56 -- Burner Tray Details
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.
48H
C
Summary of Contents for 48HC D17 Series
Page 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Page 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Page 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Page 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Page 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...
