(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
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.