A.O. Smith ATI-140H-N Service Handbook page 47

Flame Rod Wire Connector:
To remove, pinch flat sides at end
with your finger nails, then slide
connector off the spade.
Figure 44.
5.2 Remove two heaters and
clips (located at top and
bo om of tube):
◦
Items 413 & 451, p. 70.
◦
Items 414 & 451, p. 70.
See also Figure 47.
5.3 Slide the cold connec on tube
downward and remove it.
Gas Valve
Port
Air Tube
Figure 45.
6. Remove the igniter assembly:
6.1 Remove the screw that
secures the igniter assembly
(Figure 25, page 36).
6.2 Disconnect the igniter
wire at the igniter rod wire
connec on (Figure 25, page
36).
7. Disconnect the blue wires from the
high limit switch. See "High Limit
Switch (Heat Exchanger)," Figure
25, page 36.
The wires are locked onto the
connectors. Pinch the fl at sides of
each connector to release it.
8. Remove the Gas Valve and
Manifold Plate Assembly:
8.1 Unplug wire connectors from
the air/fuel ra o rod (AFR),
fl ame rod, and igniter. See
Figure 44.
8.2 Remove the screws that
secure the green ground
wires to the manifold plate.
Manifold Screws:
• DO NOT remove the screws
shown below (indicated by
white, crossed-out circles).
• Remove the remaining
screws along the outside
edge (except as indicated).
Figure 46.
Condensing Models: On-Demand Water Heater Service Handbook • 47
Example:
Freeze Protection Heaters
with Clips
Figure 47.
8.3 Remove the screws that
secure the manifold plate
(Figure 46).
IMPORTANT: Remove only
the screws along the outside
edges of the manifold plate.
•
DO NOT remove the
screws securing the
manifold plate to the gas
valve.
•
DO NOT remove the
screws along the interior
of the manifold plate.
8.4 Remove the screw on the
le side of the gas valve that
secures the power cord.
8.5 Disconnect the air tube off
the le side of the gas valve
(Figure 45).
8.6 Disconnect the connector
on the right side (blue wires)
which goes to the overheat
cutoff fuse (Figure 25, page
36).