State GPH-90N - Manual (Page 58)

0610 58 319172-000 Rev. 00
Remove additional components:
Remove the casing bracket
Use a Phillips screwdriver to remove the four screws
holding the casing bracket to the tank.
Remove the fl exible venting
Unwrap the insulation covering the venting.
Loosen the gear clamps securing the venting.
Remove the fl exible venting.
Remove the Heat Engine
Close the shutoff valves on both the hot-water and cold-
water lines.
Close the shutoff valve on the gas supply line to the
water heater.
Drain the tank following the instructions in the “Draining
The Tank” section in the Operating Manual.
Disconnect the hoses from the heat engine (top is water
outlet and bottom is water inlet).
Disconnect the gas line from the heat engine.
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.
Remove the water lines
Disconnect the hot-water and the cold-water lines from the
tank.
Remove the condensation trap
Remove the venting to the unit.
Use a Phillips screwdriver to remove the two screws
holding the condensation trap to the tank.
Remove the condensation trap by pulling it straight out.
Remove the baffl es
Remove the large baffl e by pulling it straight up out of the
top of the fl ue tube.
Remove the small baffl e by pulling it straight out of the
side of the fl ue tube.
Remove the tank temperature sensor
Remove the clip and slide the sensor out.
Remove the earthquake straps
Remove the bolts at the clamp that hold the two halves
of the earthquake strap.
To Remove:
Lift tank out of position. Hint: Screw a short length of 3/4”
NPT pipe into the sides of the water heater to use as
handles to move the water heater.
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To Install:
Fit the new tank in position. Hint: Screw a short length of
3/4” NPT pipe into the sides of the water heater to use
as handles to move the water heater.
To Reassemble:
Reinstall the earthquake straps in the reverse order.
Reinstall the tank temperature sensor and clip in reverse
order.
Install the large baffl e.
Install the small baffl e into the condensation trap by fi tting
the tabs into the slots inside the condensation trap and
then install condensation trap and small baffl e into tank
in reverse order.
Reinstall the venting.
Connect the hot-water and cold-water lines to the tank.
Assemble heat engine to the tank.
Reconnect the gas line.
Reconnect the hoses to the tank.
Open the shutoff valves on both the hot-water and the
cold-water lines.
Fill the tank following the instructions in the “Filling The
Water Heater” section of the Operating Manual.
Carefully reconnect the wire harnesses.
Reinstall the fl exible venting in reverse order.
Re-fi t the insulation around the exhaust elbows.
Reinstall the casing bracket in reverse order.
Reassemble the rear panel in reverse order.
Reassemble the left side panel in reverse order.
Reassemble the right side panel in reverse order.
Reassemble the top casing (front and back) in reverse
order.
Close and lock the door.
Open the shutoff valve on the gas supply line to the water
heater.
Reconnect the electrical power to the water heater.
Restart the water heater following the “Lighting Instructions”
found in the Operating Manual.
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