A.O. Smith ATI-140H-N Service Handbook page 43

connec on. Hand-tighten
only. See Figure 24, page
35.
10.5 A ach the air tube from the
bo om of the combus on
chamber to the port on the
le side of the gas valve. (See
page 42, Figure 37.)
10.6 Secure the power cord to the
gas valve as shown in Figure
24 on page 35. (See the
"Power Cord Moun ng Tab"
callout.) Hand-tighten only.
•
Use the mounting tab
and the M4X10 screw.
•
The mounting hole is
located on the left side of
the gas valve.
10.7 Line up the manifold plate
with the holes on the burner
and combus on box. Insert
and hand ghten the top
center screw on the manifold
plate. (See "Manifold Plate,"
page 35.)
10.8 Hand ghten the remaining
manifold plate screws. Do
not over ghten.
NOTE: Leave the fuse box
moun ng holes open (le
side of plate). The fuse box
will be mounted later.
11. Install the igniter assembly to
the lower, right-hand corner of
the manifold plate. (See "Igniter
Assembly" and "Igniter Rod Wire
Connection" on page 35; see also
item 709 on page 69 .)
11.1 Insert and hand ghten the
screw.
11.2 Slide the black igniter
wire onto the igniter rod.
See "Igniter Rod Wire
Connec on" in Figure 24,
page 35.
12. Install the flow sensor/control valve
(item 402, p. 70) and cold connection
tube (item 462, p. 70) as follows:
12.1 Insert the long, straight end of
the cold connec on tube into
the elbow on the secondary heat
exchanger. See connec on point
"B" on page 70 (shown in two
places).
12.2 Install the fl ow sensor/control
valve onto the inlet water
connec on (Figure 24, page
35).
12.3 Insert the end of the cold
connec on tube into the outlet
of the fl ow sensor/control valve.
See connec on point "D" on
page 70 (shown in two places).
12.4 Install the fasteners:
•
One 16A fastener. See
item 459 on p. 70, which
secures the inlet of the flow
sensor/control valve to the
inlet water connection.
"16A" is marked on the end
of this clip.
Install the clip as shown in
Figure 38.
Figure 38.
Flange fits between top and
bottom of clip.
16A Fastener
Condensing Models: On-Demand Water Heater Service Handbook • 43
•
Two 14-22 fasteners. ("14-
22" is marked on the end of
each clip.)
See both instances of item
458 on page 70. These
fasteners secure the cold
connection tube at each
end. Install as described
in Figure 32, page 40.
See also connection
points "B" and "D" on
page 70. The cold
connection tube's
brass rings must be
fully inserted at each
connection point.
12.5 Verify that all of the
fasteners on the water
tubing are installed properly.
12.6 Install the cold water inlet
fi lter. Refer to the water
heater's manual, if needed.
12.7 Test for leaks by slightly
opening the water supply
to the water heater. Check
the water tube connec ons
for any drips or leaks. If any
appear, turn off the water,
drain the water heater, dry
the components that got
wet, and fi x the leak.
13. Verify that the following pipe heaters
are installed. See the pipe heaters on
page 70: item 413 (three instances),
item 414 (two instances), and item 418
(one instance).
13.1 Install the long pipe heater to
the bo om of the secondary
heat exchanger. It will span
the front, le -hand side of the
primary heat exchanger as
shown in Figure 24, page 35.
See also item 413, page 70.