Figure 71.26. Circulating pump switch.

(2) With the flame switch at room

temperature, loosen the adjusting screw

until a distinct click is heard. Then tighten

the screw until a second click occurs. At

this point continue to tighten for three-

eighths of a turn to correctly position the

adjusting screw.

Flame Switch Test.

(1) At room temperature, check for continuity

across terminals 2 and 4 and terminals 2

and 5 (fig. 71.23) with an ohmmeter. If

continuity exists, continue the test.

(2) Apply heat to the flame switch tube. The

switch should change to hot position at

400 to 500oF. Continuity should now be

across terminals 1 and 2 and terminals 1

Figure 71.25. Limit switch, removal and installation.

and 5. Allow the

Figure 71.26. Circulating pump switch.

AGO 5667A