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

MAINTENANCE

Indoor Model:
Over-heat
Cutoff Fuse
(OHCF)
Flame Rod
& AFR* Wire
Connections
Clip for High
Limit Wires
This Screw
Secures
Computer
Board
Assembly.
Fuse Box
Ground
Connections
Computer
Board
* Air/Fuel Ratio Rod
See also "Component Diagrams/Item Numbers" which starts on page 67.
High Limit Switch
(Exhaust)
Condensate
Drain Tube
Pipe Heater
Figure 24.
Condensing Models: On-Demand Water Heater Service Handbook • 35
Exhaust
Thermistor
Secondary Heat
Exchanger
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.
Flow Sensor/Control
Valve (Behind Wires)