MAINTENANCE
On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models •
MAINTENANCE
Ground
Connection
Pipe Heater/Block Heater
Condensate
Drain Tube
Three Screws
Secure the Secondary Heat
Exchanger to the Case
High Limit Switch
(Heat Exchanger)
Primary Heat
Exchanger
Igniter Rod Wire
Connection
Secondary Heat
Exchanger
Over-heat
Cutoff Fuse
(OHCF)
Bypass Valve
(540 only)
Flame Rod
Connections
This Screw
Secures the
Computer
Board
Assembly.
Fuse Box
Computer
Board (PCB)
High Limit Switch
(Exhaust)
Exhaust Thermistor
See also “Component Diagrams/Item Numbers” which starts on page 71.
Connector for
Overheat Cutoff
Fuse (Blue Wires)
Manifold Plate
Igniter Assembly
(not visible)
Brass Manifold
Test Port Screw
Power Cord
Mounting Tab
Gas Proportional
Valve (GPV)
Main Gas Valve
Brass Screw Securing
Gas Valve to Gas
Inlet Connection.
Flow Sensor/Control
Valve (Behind Wires)
Heat Exchanger
Thermistor
(540 only)
Figure 41 .
Burner
Screws (2)
Securing
Fuse Box
Outlet
Thermistor
(behind PCB)
Clear Plastic Tube
(Combustion Chamber Tube)
Inlet Thermistor (black wires)
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