Bosch NGT73 User manual

This page intentionally left blank

TABLE OF CONTENTS
TITLE PAGE
FEATURES OF COOKTOP................................................................................................1
30” Models ...................................................................................................................1
36” Models ...................................................................................................................1
COOKTOP OPERATION ...................................................................................................2
Sealed Burners ...................................................................................................... 2
Burner Caps...........................................................................................................2
Burner Grates ........................................................................................................ 2
Burner Control Knobs ............................................................................................ 2
Electronic Ignition/Reignition .................................................................................3
Typical Flame Characteristics................................................................................3
Power Failure.........................................................................................................3
Replacing the Maintop ........................................................................................... 4
Replacing a Burner Base & O-Ring ....................................................................... 6
Replacing an Ignitor...............................................................................................7
Replacing a Gas Valve & Spark Switch.................................................................8
Replacing the Spark Module................................................................................10
Replacing a Jet Holder ........................................................................................ 12
Replacing the Gas Pressure Regulator ...............................................................14
TROUBLESHOOTING......................................................................................................15
THEORY OF OPERATION ........................................................................................ 15
The Gas Distribution System ...............................................................................15
Principles of the Isophording Gas System........................................................... 16
Isophording Sealed Gas System .........................................................................16
How to Measure Gas Pressure............................................................................17
The Gas Pressure Regulator ...............................................................................18
Manifold and Gas Values.....................................................................................18
Testing a Gas Pressure Regulator ......................................................................19
Gas Valve Operation ...........................................................................................20
Gas Valve Bypass Screw .................................................................................... 20
Orifices................................................................................................................. 21
The Injector Sleeve..............................................................................................22
Burner Assembly .................................................................................................23
Spark Switch........................................................................................................ 24
The Spark Ignitor (Electrode)...............................................................................25
Spark Module....................................................................................................... 25
The Gas Pressure Regulator ...............................................................................26
Troubleshooting Chart B ............................................................................................27
Wiring Diagram ..........................................................................................................28

This page intentionally left blank