Removing And Replacing The Main Gas Valve Mv Assembly - American Water Heater 160X3P Manual

Removing and
Replacing the
Main Gas Valve
(MV) Assembly
WARNING!
• To ensure your safety and the
safety of others, read and follow
each step of these instructions.
Failure to do so could result in
personal injury or death.
• If you do not have the skills
necessary to complete this
procedure correctly, do not
proceed. Seek assistance from a
qualified service technician.
Removing the gas valve assembly:
Tools Needed: #2 Phillip's Head
Screwdriver
NOTICE: DO NOT USE ELECTRIC
SCREWDRIVERS OR DRILLS, HAND
TIGHTEN ALL SCREWS TO PREVENT
OVER TIGHTENING.
Disconnect power to the water
1
heater by unplugging it from
the wall outlet or turning it off
at the circuit breaker, as appropriate.
The power button on the water heater
and remote does NOT disconnect
power to the water heater. You must
physically disconnect power to the
water heater.
Use a non-contact circuit tester to
confirm that power is off before
working on or near any electrical parts.
Shut off the gas supply to the water
2
heater at the manual gas shutoff
valve.
Use a Phillips-head screwdriver to
3
remove the 4 screws securing the
cover to the water heater. Set the front
cover and screws aside for re-installa on.
Locate the wire on the built-in
4
controller and follow it to the
computer board. Carefully disconnect
the built-in controller from the computer
board. Reference the wiring diagram on
page 28 in the manual or maintenance
sheet. Set the built-in controller aside
for re-installa on.
Built In Controller
Connector Connecto
Figure 36: Built-in controller removal.
Remove the screw securing the
5
surge box fi xing plate to the base
of the water heater housing. See Figure
37.
Surge Box Fixing Plate Box Fixing P P P P P P P la lat lat lat la la la e
R R Remove and keep R R R em R R R ove and
this screw. this screw.
Figure 37: Surge box fixing plate removal.
Carefully reposi on the surge
6
box fi xing plate, computer
On-Demand Water Heater Service Handbook for X3P Models
board, and wiring so that you have clear
access to the gave valve assembly.
1
7
fastener securing the copper
gas pipe to the gas valve assembly.
Carefully reposi on the pipe for clear
access to the gas valve assembly.
Remove the screw securing the wiring
harness to the gas valve assembly.
Remove the screw securing the gas valve
assembly to the gas inlet mount. See
Figure 38.
1
or o o r r r r r r r r
Figure 38: Gas valve assembly removal.
Li the gas valve assembly from
8
the water heater. Check the gas
valve assembly to ensure the old o-ring
and plas c bushing were not le in the
gas inlet mount.
Replacing the gas valve assembly:
WARNING! The gas valve assembly
must be properly installed to prevent
gas leaks.
instruc ons can result in serious injury
or death from explosion, fi re or carbon
monoxide poisoning.
Install
9
assembly. Inspect the o-ring on
the new gas valve assembly, if any cuts
or nicks are present replace the o-ring
immediately.
Remove the 16-25A metal
2
3
2
3
Failure to follow these
the new gas valve
• 49