American Water Heater 160X3P Manual page 51

Figure 39: 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
10
on the fan motor assembly to their
plas c connectors. Disconnect and move
them aside. Reference Figure 40 to iden fy
cables.
Air Damper
Connector
Gas Solenoid
Y,O,W,R,BR
Valve Connector
R,LB,G,B
Figure 40: Fan Motor Assembly Wire Connections
Remove the 16-25A
11
fasteners on both ends of the
copper gas pipe (# 104) and set them
aside for re-installa on. Remove the two
screws securing the fan motor to the
mixing chamber assembly. See Figure 41.
Copper Gas Pipe
Fan Motor Screws Fan Motor Screws
Figure 41: Gas Pipe and Fan Motor Assembly
removal.
Remove the complete fan motor
12
assembly from the water heater
and set it aside for re-installa on.
Disconnect the heat exchanger
13
thermistor cable (# 411). Figure 42.
Figure 42: Disconnect for Heat Exchanger Thermistor.
Disconnect the plas c connector
14
joining the purple igniter rod wires.
Disconnect
15
connector (Yellow wire). No ce:
the fl ame rod connector uses a special
connec on. Press the small tab in the
Pressure
center of the connector to release it. See
Sensor
Figure 43.
Connector
R,W,BK
metal
Press small
tab.
Flame Rod Conne Flame Rod Connector
On-Demand Water Heater Service Handbook for X3P Models
16-25A Fastener
Heat Exchanger
Thermistor
the fl ame rod
Figure 43: Flame Rod Connector.
Disconnect the Over Heat Cutoff
16
Fuse (O.H.C.F.) # 413 wires at the
plas c connector and the Hi Limit Switch (#
721) wires at the plas c connector. Both
connectors are located on the same blue
cable. They are located at the right side of
the Primary Heat Exchanger.
Disconnect the inlet thermistor (#
17
407). It is located under the
secondary heat exchanger. See Figure 44.
Inlet Thermistor Connector
Figure 44: Inlet Thermistor Connector.
Disconnect the 16-25A metal
18
fasteners connec ng the copper
pipe to the primary heat exchanger outlet
(# 468) and the water outlet tee (Reference
Joint C in maintenance instruc ons). Move
the pipe aside and keep the metal
fasteners for re-installa on. See Figure 45
on page 51.
16-25A Metal
Fastener
Primary Heat
Exchanger Outlet
Figure 45: Primary Heat Exchanger Outlet.
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