American Water Heater 160X3P Manual page 57

Disconnect the rubber drain tube
20
(# 416) from the bo om right of the
secondary heat exchanger. The connec on
uses a compression clamp and will require
pliers to move the clamp. See Figure 64.
Compression Clamp Compressio
Drain Line
Figure 64: Drain line.
Disconnect the ceramic block
21
heater from the Primary Heat
Exchanger inlet pipe (# 467). Move the
block heater and wires aside to prevent it
catching on the heat exchanger assembly
when it is being removed. See Figure 65.
Primary Heat Exchanger Primary Heat Exchanger
Inlet Inlet t t t t t
Ceramic Block Heater Cerami mi mi mic i i i c Block He
Figure 65: Ceramic block heater on Primary Heat
Exchanger Inlet Pipe.
Disconnect the exhaust thermistor
22
(# 718) and move the wires aside.
Remove and set aside the screw securing
the exhaust duct to the top of the water
heater enclosure. See Figure 66.
on n Clamp
Figure 66: Exhaust Thermistor.
NOTICE: Read this step carefully
23
before performing any ac ons.
Cover electronics and anything directly
under the water heater as some water
will drain from the heat exchanger
assembly during its removal. Remove
and set aside the 4 screws securing the
support bracket to the back of the water
heater enclosure. The heat exchanger
assembly must then be supported by
hand, when removing the two screws
securing it to the enclosure. To reach the
screws, a magne zed p Phillips-head
screwdriver with a length of at least 8
inches or more must be used. See Figure
67. Once both screws are removed and set
aside, begin the removal of the heat
exchanger assembly. While suppor ng the
heat exchanger base, lt it outward from
the bo om. Use care not to damage the
water piping and other components under
the heat exchanger. Once the heat
exchanger assembly base is clear of the
front of the water heater slowly lower it to
disconnect the plas c exhaust duct from
its fi ng at the top of the water heater.
The heat exchanger assembly should be
placed on a secure surface, taking note not
damage the various piping and wiring
connec ons that are s ll a ached.
On-Demand Water Heater Service Handbook for X3P Models
Screws Screws ws
Exhaust Duct Exhaus s t t t t t t t D D D D D D D Du Du D u ct
Screw Screw
Figure 67: Heat Exchanger Screws
Exhaust
Remove
24
Thermistor
fasteners securing the copper
inlet tube (#467) to the heat exchangers.
See Figure 68. If you are replacing only
the inlet tube, proceed to step 32.
Otherwise, proceed to the next step.
Figure 68: Header Connection Removal
Disconnect the green and gray
25
wires from the igniter rod.
Unbundle the green wire from the metal
cable guides. See Figure 69.
Ig Igniter Rod g ni ni n n i i
Figure 69: Igniter Rod Connections.
Remove
26
securing the support bracket and
set them aside for re-installa on.
Remove the ten screws securing the
s s s s s s s
the 16-25A metal
16-25A Metal A Meta l
Fastener er
t e te te ter t r r r r Ro R R R d
the three screws
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