Removing And Replacing Secondary Heat Exchanger - American Water Heater 160X3P Manual

correctly and seated securely.
Before restoring power to the
55
water heater, check the piping
connec ons by restoring water to the
system and check for any leaks. Allow a
few moments for the system to pressurize.
Correct any leaks immediately. Open a hot
water faucet and allow the water to run
un l it fl ows with a full stream.
Replace the front cover and
56
secure with the four screws
removed earlier. Note the placement of
the built-in controller when se ng the
front cover in place to ensure proper
alignment.
Turn on the gas supply to the
57
water heater at the manual gas
shutoff valve.
Reconnect power to the water
58
heater by plugging it into the wall
outlet or turning it on at the circuit
breaker, as appropriate. Press the On/Off
bu on to turn the water heater back on.
Turn on the gas supply to the
59
water heater at the manual gas
shutoff valve.
Verify proper opera on of the
60
water heater.
Removing
and Replacing
Secondary Heat
Exchanger
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.
Tools Needed: #2 Phillip's Head
Screwdriver, #2 Phillip's Head
Screwdriver (16" or longer with
magnetic tip), Pliers.
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
2
water heater at the manual gas
shutoff valve.
Shut off water to the water
3
heater and drain the system.
Place a bucket under the water heater
and open the plas c drain port located
on the bo om le side of the water
heater. Allow the system to completely
drain before proceeding.
Use a Phillips-head screwdriver to
4
remove the 4 screws securing the
cover to the water heater. Set the front
cover and screws aside for re-installa on.
Remove the screw securing the
5
le side of the rain protec on
tray. Slide the rain protec on plate from
the water heater. Keep the screw with
the rain protec on tray for re-
On-Demand Water Heater Service Handbook for X3P Models
installa on.
Remove the white plas c cable
6
clips securing the various cables
to the copper gas pipe.
Locate the plas c computer
7
board housing on the bo om
right side of the water heater. Remove
the screw and bracket securing the
plas c housing for the computer board.
Keep the screw and bracket for re-
installa on. Slide the computer board
and plas c housing out from the water
heater to access the cable connec ons.
Figure 55: Computer Board Bracket.
Locate the wire on the built-in
8
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 or in the maintenance sheet.
Set the built-in controller aside for re-
installa on.
Disconnect the black fan motor
9
cable from the computer board.
Reference the wiring diagram on page
28 or in the maintenance sheet. Slide
the computer board and plas c housing
back into the water heater to prevent
unnecessary tension on the cables.
Locate and follow the three cables
9
coming from the fan motor
assembly to their plas c connectors.
Disconnect and move them aside.
• 55