Installation - A.O. Smith ATI-140H-N Service Handbook

Installa on
1. If a new burner is being installed,
then you must complete one of
the following steps:
Transfer the burner damper (item
112, p. 69) from the original
burner to the new burner. Remove
two (2) screws (one on each end),
then hand tighten them on the new
burner.
-OR-
Install a new burner damper if one
is needed (item 112, p. 69). They
are different for indoor and outdoor
models, although the burner
assembly (item 102, p. 69) is the
same.
•
INDOOR Model: part no.
320273-359. It has 881
stamped on the lower,
right-hand corner.
•
OUTDOOR Model: part
no. 320273-360. It has
882 stamped on the
lower, right-hand corner.
2. Install the burner into the
combus on chamber. There
are grooves on the sides of the
combus on chamber to slide the
bo om of the burner in between:
2.1 Insert and hand ghten two
screws below the burner,
at the back (Figure 69, p.
58). These screws will
secure to the back of the
cabinet. You may need to
push the assembly up some
in order to line up the holes.
2.2 Insert three screws along the
top por on of the burner, then
hand ghten them. See Figure
69, page 58.
3. Install the manifold plate/gas
valve assembly (item 102, p. 69)
to the combus on chamber:
3.1 A ach the white wire
connector (blue & red wires)
to the solenoid on the back
of the manifold plate (Figure
72).
3.2 Line up the manifold plate
with the holes on the burner
and combus on box.
3.3 Insert and hand ghten
the top center screw on
the manifold plate. Do not
overtighten.
3.4 Secure the manifold plate
by hand ghtening the
remaining screws around
the outside edge of the
plate. Do not overtighten.
If necessary, refer back to
Figure 70, page 58.
3.5 A ach the clear air tube
from the bo om of the
combus on chamber to the
port on the le side of the
gas valve. (See Figure 66)
4. Install the igniter assembly (item
709, p. 69) to the lower, right-
hand corner of the manifold plate.
See Figure 24, page 35.
4.1 Insert the screw, then hand
ghten it.
4.2 Slide the black igniter
wire onto the igniter rod.
(See "Igniter Rod Wire
Connec on" in Figure 24,
page 35).
5. Hand- ghten a screw at the
bo ommost hole of the manifold
plate (le side). This hole is just
below the loca on at which the
Condensing Models: On-Demand Water Heater Service Handbook • 59
fuse box will be installed. (If
needed, refer to Figure 74, page
60).
6. Hook up the freeze protec on
heater wiring:
6.1 At the top of the fuse box
loca on, connect two plugs
and receptacles as described
in Figure 71, p. 58.
NOTE: All connectors with
yellow wires are connected
to the same circuit, so the
order in which you connect
them does not ma er.
6.2 Below the fuse box loca on,
connect three plugs and
receptacles as shown in
Figure 73.
6.3 Locate the one remaining
plug/receptacle pair (yellow
wires). Plug them together.
Secure these wires with the
cable clamp on the le side
of the cabinet.
Below the fuse box location,
connect plugs to receptacles.
Three pair:
white with yellow wires.
Figure 73.