State GPH-90N - Manual (Page 19)

Service Instructions
0610 19 319172-000 Rev. 00
GAS WATER HEATERS
GAS VALVE 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.
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.
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 ten screws that secure the front cover of
the heat engine. Remove the front cover of the Heat
Engine.
Remove the two screws securing the circuit board and
partially extract it.
Carefully disconnect the Gas Valve wiring harness plug
from the circuit board.
Disconnect the gas line from the heat engine.
Remove the two screws that secure the Gas Inlet
Fitting.
Remove the four screws that secure the Burner Orifi ce
Plate. One of these screws also secures the Spark
Generator.
Pull the Gas Valve Assembly away from the heat
engine.
Carefully disconnect the wire harness from the Gas
Valve Assembly.
Remove the fi ve screws and washers securing the Burner
Orifi ce Plate to the Gas Valve.
Remove the four screws and washers that secure the
Gas Line Extension to the Gas Valve.
Remove the Gas Valve. 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
To Install:
Fasten the Gas Line Extension to the new Gas Valve
with the four screws and washers. Ensure the O-ring is
undamaged and properly positioned.
Secure the Burner Orifi ce Plate to the Gas Valve with
fi ve screws and washers.
Carefully reconnect the wire harness to the Gas Valve
Assembly (green wire pair to the lower right solenoid,
yellow & black pair wire to the lower left solenoid, black
& white pair to the top right side solenoid and black &
brown pair to the top left side solenoid).
Install the Gas Valve Assembly into the heat engine,
ensuring the Assembly is seated properly between the
Orifi ce Plate and the heat engine.
Secure the Orifi ce Plate with four screws. Ensure the
Spark Generator is properly secured.
Secure the Gas Inlet Fitting with two screws. Ensure the
O-ring is undamaged and properly positioned. 1.
2.
3.
4.
5.
6.
Access To
Door Pins
Door
Lock