A.O. Smith ATI-140H-N Service Handbook page 36

Outdoor Model:
Over-heat
Cutoff Fuse
(OHCF)
Flame Rod
& AFR* Wire
Connections
Fuse Box
This Screw
Secures
Computer
Board
Assembly.
Ground
Connections
Computer
Board
* Air/Fuel Ratio Rod
See also "Component Diagrams/Item Numbers" which starts on page 67.
36 • Condensing Models: On-Demand Water Heater Service Handbook
Condensate
Pipe Heater
Drain Tube
Figure 25.
Three Screws
Secure the Secondary Heat
Exchanger to the Case
Secondary
Heat Exchanger/
Exhaust Vent
Primary Heat
Exchanger
High Limit Switch
(Heat Exchanger)
Igniter Rod Wire
Connection
Manifold Plate
Connector for
Overhead Cutoff
Fuse (Blue Wires)
Igniter Assembly
(not visible)
Brass Manifold
Test Port Screw
Main Gas Valve
Power Cord
Mounting Tab
Gas Proportional
Valve (GPV)
Brass Screw Securing
Gas Valve to Gas Inlet
Connection
(not visible)
Flow Sensor/Control
Valve (Behind Wires)