Testing cont’d, Type 956 Flame Detectors

TYPE 956 FLAME DETECTORS

OLD STYLE	NEW STYLE

TESTING (cont’d)

NOTE

CELL SOCKET ASSEMBLY

CELL ASSEMBLY

Rotate Cell Assembly counter- clockwise to remove it. To replace it, insert end through notched open-

ing in bracket and rotate clock-

wise. NOTE: If bracket is ever re- BRACKET moved from burner, Cell Assembly

will not fit if bracket is reinstalled backwards.

If indicator of ohmmeter remains steady, read- ings up to 2000 ohms should also be acceptable. Generally, the lower the reading, the better the application, and less likely the chance of burner flame variation causing a safety lock-out.

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

PART No. OF REPLACEMENT PARTS

F063-0485	Cell only (Old Style)

F063-2006	Cell assembly (New Style)

still high, readjustment of burner flame and/or nozzle

replacement may be necessary (according to burner

manufacturer’s instructions).

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.

!WARNING

Be sure to remove wire jumper after finishing this flame detector check.

668-451 specifications

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