31
REMOVAL AND REPLACEMENT OF GAS TRAIN
See Fig. 46, 49, and 53.
1. Shut off manual gas valve.
2. Shut off power to unit.
3. Remove the control box access panel.
4. Remove the control box high voltage cover.
5. Remove the screw at the base of the burner partition panel
(see Fig. 51) and slide out the panel.
6. Disconnect gas piping at unit gas valve.
7. Remove wires connected to gas valve. Mark each wire.
8. Remove igniter wires and sensor wires at the Integrated
Gas Unit Controller (IGC). (See Fig. 54.)
9. Remove the two screws attaching the burner rack to the
vestibule plate (see Fig. 50).
10. Slide the burner tray out of the unit (see Fig. 53).
11. Reverse the procedures outlined above to reinstall the
burner rack.
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. 55-58.)
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. 52.
6. Reinstall burners on rack in the same locations as factory-
installed. (The outside crossover flame regions of the out-
ermost 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.
Fig. 53 — Burner Tray Details
Fig. 54 — Unit Control Box/IGC Location
Removing the Heat Exchanger
The following procedure details the steps to remove the heat
exchanged from the unit.
1. Turn off electric power to the unit and shut off the unit’s
gas supply.
2. Remove the two exterior panels: control box access panel
and indoor blower access panel.
3. Remove the unit center post (see Fig. 51).
4. Remove the three interior panels: control box high voltage
panel, burner partition panel, and heat exchanger cover
panel.
5. Disconnect the wires connected to the gas valve. Mark
each wire.
6. Disconnect the igniter wires and sensor wires at the inte-
grated gas controller (IGC).
7. Disconnect a gas pipe union and remove the gas manifold
with the gas valve.
8. Remove the two screws attaching the burner rack to the
vestibule plate (see Fig. 50).
9. Remove the pressure switch hose from the connection on
the flue cover assembly (see Fig. 50).
10. Remove the screws around the vestibule plate.
11. Remove the nuts holding the heat exchanger support rack
to the fan deck.
12. Remove the heat exchanger from the unit.
13. Separate the following from the heat exchanger: inducer
fan-motor assembly, flue cover assembly, retainer, regula-
tor, regulator gasket, and if a Low NOx unit, also remove
the baffle assembly. See Fig. 50.
RACEWAY
INTEGRATED GA
S
UNIT
CONTROLLER (IGC)
HOLE IN END PANEL (HIDDEN)
Summary of Contents for Preferred 581J04-14
Page 36: ...36 Fig 60 Integrated Gas Control IGC Board RED LED STATUS ...
Page 44: ...44 Fig 65 RTU Open Overlay for Economizer Wiring ...
Page 45: ...45 Fig 66 VFD Overlay for W2770 Controller Wiring ...
Page 100: ...100 Fig F 581J 08 09 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 101: ...101 Fig G 581J 11YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 102: ...102 Fig H 581J 12 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 103: ...103 Fig I 581J 04 06 YAC Power Diagram 208 230 1 60 APPENDIX D WIRING DIAGRAMS ...
Page 104: ...104 Fig J 581J 04 06 YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 105: ...105 Fig K 581J 04 06 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 108: ...108 Fig N 581J 07 12A B C YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 109: ...109 Fig O 581J 07 12A B C YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 110: ...110 Fig P 581J 08 09 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 111: ...111 Fig Q 581J 08 09 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 112: ...112 Fig R 581J 11 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 113: ...113 Fig S 581J 11 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 114: ...114 Fig T 581J 11 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 115: ...115 Fig U 581J 12 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 116: ...116 Fig V 581J 12 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 117: ...117 Fig W 581J 14 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 118: ...118 Fig X 581J 14 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 119: ...119 Fig Y 581J 14 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 120: ...120 Fig Z 581J 14 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 143: ...143 Fig AW RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...