L.B. White I-17 Infraconic - 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 - (L. B. White Part No.
21188) When used with a standard digital multimeter,
t h i s k i t a l l ow s te s t i n g o f t h e t h e r m o c o u p l e a n d
electromagnetic power unit.
• Pressure Gauge - (L. B. White Part No. 20736) For
checking inlet pressures to the heaters.
INITIAL PREPARATION
-- Inspect heater for damage.
-- Thoroughly clean the heater.
Heater Problems Page
1. Heater does not light . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2. Flames extending beyond outer cone or lazy flame. . . .21
3. Heater lights but does not stay lit. . . . . . . . . . . . . . . . . . .22
4. Outer combustion cone does not heat up on
high thermostatic head setting . . . . . . . . . . . . . . . . . . . .23
5. Heater backflashes gas through air housing inlet . . . . .24
6. Heater does not cycle back to low heat . . . . . . . . . . . . .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.