State GPH-90N - Manual (Page 3)

0610 3 319172-000 Rev. 00
Remove the 4 nuts holding the heat engine to the tank.
(Requires 1/2” wrench, socket or nut-driver.) It may be
necessary to remove part of the venting system to access
some nuts.
Remove the heat engine.
To Install:
Assemble the new heat engine to the tank.
Reconnect the hoses to the heat engine.
Reconnect the gas line.
Open the shutoff valves on both the hot-water and cold-
water lines.
Open the shutoff valve on the gas supply line.
Fill the tank following the instructions in the “Filling The
Water Heater” section in the Operating Manual.
Carefully reconnect the wire harnesses.
Reassemble the side panel in the reverse order.
8.
9.
1.
2.
3.
4.
5.
6.
7.
8.
Reassemble the fl exible venting in the reverse order.
Re-fi t the insulation around the exhaust elbows.
Reassemble the top casing in the reverse order.
Reconnect the electrical power to the water heater.
Restart the water heater following the “Lighting
Instructions” found in the Operating Manual. 9.
10.
11.
12.
13.
Nut
Nut