L.B. White I-34 Infraconic Pilot Ignition - Manual (Page 20)

20
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
The following troubleshooting flow charts provide systematic
procedures for isolating heater problems. The charts are
intended for use by a QUALIFIED GAS HEATER SERVICE
PERSON. DO NOT SERVICE THE HEATER UNLESS YOU HAVE
BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital Multimeter - For measuring DC voltage when using
thermocouple diagnostic kit.
• Thermocouple Diagnostic Kit - (Part No. 21188) When
used with a standard digital multimeter, this kit allows
testing of the thermocouple and electromagnetic power
unit.
• Pressure Gauge - (Part No. 20736) For checking inlet
pressures to heaters.
INITIAL PREPARATION
-- Inspect heater for damage.
-- Clean the heater as necessary.
Heater Problems Page
1. Pilot will not Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2. Pilot Lights, but will not Stay Lit . . . . . . . . . . . . . . . . . . .22
3. Pilot Does Not Relight After Cycling
From Main Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4. Outer Combustion Cone Does Not Heat . . . . . . . . . . . . .23
5. Heater Backflashes Gas Through Injector Body
Air Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6. Heater Does Not Operate from
Main Burner to Pilot Only . . . . . . . . . . . . . . . . . . . . . . . . .24
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart. Refer to the “Servicing” sections as necessary to
obtain information on disassembly and replacement
procedures of the component once the problem is identified
by the flow chart.
Troubleshooting Guide
WARNING
Burn Hazard
■
Troubleshooting this system may require operating the
heater with the burner on. Use extreme caution when
working on the heater.
■
Failure to follow this warning will result in burns
causing severe injury.