A.O. Smith GTS-305-NE Service Manual page 54

Component Replacement Instructions
Heat Exchanger
24. Insert the burner and place the burner
cover plate into position. Attach the
burner cover plate first with 9 screws and
then attach the burner with 2 screws.
(Figure 78)
25. Replace the electrode gasket. (Figure 83)
26. Make sure that the black gasket (Figure 84)
is intact on the gas control assembly.
Replace the lower and upper gaskets
(included in kit) for the manifold plate
removing any residue. (Figure 85)
27. Attach the electrical connector to the
ignitor on the manifold and attach the gas
manifold with 2 machine screws at the
gas control assembly. (Figure 77)
28. Attach the gas manifold with 5 screws at
heat exchanger. (Figure 77)
29. Connect wire harness attachments.
30. Attach the ignition line at the burner
cover plate.
31. Attach the 3 electrical connectors to the
solenoid valves.
32. Attach the wire harness to the fan
assembly (white, yellow, black, red
wires).
33. Attach the brackets to the water line
connections. (Figure 77)
34. Install the front panel using 4 screws.
35. Turn on the water supply, power supply,
and gas supply.
36. Check for gas leaks.
On-Demand Gas Tankless Water Heater Service Manual
705i (ASME)
Figure 83
Gasket
Figure 84
Figure 85
54
Electrode Gasket
Gaskets