TESTING CONT.
PART No. OF REPLACEMENT PART
Cell only (Old Style) | |
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4.If safety lockout problem is of an occasional nature the following additional check may be made to insure that flame detector location is not a marginal one:
a.Disconnect flame detector leads from “F” terminals.
b.Attach a jumper wire to one “F” terminal. Start burner. Then immediately connect jumper wire to the other “F” terminal. Burner should continue to run.
c.With burner running, attach flame detector leads to an accurate ohmmeter. Reading of ohmmeter should be below 1000 ohms, and preferably as low as 500 ohms.
NOTE
If indicator of ohmmeter remains steady, readings up to 2000 ohms should also be acceptable. Gener- ally, though, the lower the reading, the better the application, and less likely the chance of a variation in the burner flame causing a safety
d.If resistance of flame detector is over 1000 ohms, it may not be able to see the burner flame properly. Check alignment of the flame detector through the hole in the static pressure disc. Clean this hole if it is blocked by foreign matter. Check for broken “F” wires.
e.If flame detector alignment is good but resistance is still high, readjustment of burner flame and/or nozzle re- placement may be necessary (according to burner manufacturer’s instructions).
!WARNING
Be sure to remove wire jumper after finishing this flame detector check.
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