A.O. Smith ATI-140H-N Service Handbook page 42

cabinet. You may need to
push the assembly up some
in order to line up the holes.
6.2 Insert and hand ghten
three (3) screws along the
top, front por on of the
burner (Figure 29, p. 39).
7. Insert the outlet tubing into the
water outlet connec on, making
sure that the brass ring on the
tube goes all the way in and is
fl ush with the top of the outlet
connec on (Figure 35). Install
fastener 16-25 (stamped on the
end of the fastener). See also
item 460 on page 70.
8. A ach the top of the condensate
drain tube to the port on the bo om
of the secondary heat exchanger.
(See Item 415 and connec on point
"E" on p. 70.)
Figure 35.
Hot Outlet Tube Installation
Example:
Once tube is installed,
secure with fastener 16-25.
Bottom, left-hand side of case
42 • Condensing Models: On-Demand Water Heater Service Handbook
9. Install the fan with the air inlet
facing toward the front as follows:
9.1 Slide the fan discharge into
the slots on the bo om of
the combus on chamber.
9.2 Line up the holes, then
insert and hand- ghten two
(2) hex head screws (item
54). See page 69.
10. Install the gas valve/manifold
assembly (item 102, p. 69) as
described below:
10.1 Make sure the screen on the
inlet to the gas valve is s ll
in place.
10.2 A ach the wire connectors
to each of the solenoid
valves.
•
Each connector has a dark
blue wire, except for the
proportional valve. The
other wire colors will vary.
•
Each set of wires has a
tag with a number on it.
Each solenoid valve has
Figure 36. Gas Valve Wiring
Solenoid Connector
Stamped Numbered
Number
In each case, these numbers
must match.
•
•
10.3 Slide the gas valve/manifold
plate assembly onto the gas
inlet connec on. You may
need to rotate the gas valve
while sliding down for an
easier fi t. The tab on the
gas valve connec on should
line up behind the tab on
the gas inlet connec on.
10.4 Secure the gas valve to the
gas inlet by installing the
brass screw (with washer)
through both tabs at the
Gas Valve
Air Tube
Wire
Air Tube Connection
a number stamped next
to it. During installation,
each wire number must
match its solenoid valve
number. See Figure 36.
Install each connector to
the solenoid valve with
the matching number.
The proportional valve
does not have a number
and is located at the
bottom of the assembly.
Wire colors: red & white.
Figure 37.
Port