State GPH-90N - Manual

Service Instructions
0610 1 319172-000 Rev. 00
GAS WATER HEATERS
HEAT ENGINE REPLACEMENT
This instruction has been prepared to acquaint you with the service of your gas-fi red water heater. It is your responsibility to
ensure that your water heater is properly installed and maintained.
Failure to follow the instructions in this service instruction sheet may result in serious bodily injury and/or property
damage. Thoroughly read and understand all instructions before you attempt to install, operate or service this heater.
Maintenance and service requires trade knowledge in the areas of plumbing, electricity and gas. If you lack these skills or
have diffi culty understanding these instructions you should not proceed. Enlist the help of a qualifi ed service technician to
service this water heater.
Remove panels to gain access:
Door opening
Unlock the door by rotating the lock counter-clockwise
with a wide, slot screwdriver.
Release the top and bottom door pins by prying the pins
out, using a small screwdriver.
Open the door (the door remains fastened to the left
side panel).
Remove the top casing (front)
Use a screwdriver to remove the six screws securing
the top casing.
Lift up and remove casing top (front).
Remove the fl exible venting
Unwrap the insulation covering to expose the front elbow
of the venting.
Loosen the gear clamps securing the venting.
1.
2.
3.
1.
2.
1.
2.
Remove the fl exible elbow from the top of the heat
engine.
Remove the right side panel
Use a screwdriver to remove the screw from the bottom,
front of the right side panel.
Remove the three screws from the right side panel
towards the rear of the unit.
Remove the screw from the top of the unit.
Push the panel back and lift out.
To Remove:
Disconnect the electrical power to the water heater.
Close the shutoff valve on the gas supply line to the
water heater.
Close the shutoff valves on both the hot-water and cold-
water lines.
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.
Carefully disconnect the wire harnesses from the heat
engine.
3.
1.
2.
3.
4.
1.
2.
3.
4.
5.
6.
7.
Access To
Door Pins
Door
Lock
Screws
Top Casing
(Front)
Screws Screws
Top
Casing (Front)