1.
Remove screw securing switch’s mounting bracket to
the bottom barrel of the heater. See Fig. 8.
2.
Rotate the switch so its paddle can be pulled down
through the hole.
3.
When installing the replacement switch, ensure
mounting bracket’s tab is positioned in hole adjacent
to mounting screw hole.
FIG. 8
AIR PROVING SWITCH
REPLACEMENT
1.
Remove the screw holding the switch to the side of
the barrel. See Fig. 9.
2.
When installing the replacement switch, ensure
mounting bracket’s tab is positioned in hole adjacent
to mounting screw hole.
FIG. 9
TESTING
The switch should be tested annually.
1.
Remove the switch assembly. Holding the switch by
its bracket, apply a small flame to the sensing disk of
the switch. See Fig. 10. Be careful not to melt the
plastic housing of the switch when conducting this
test.
2.
Within a few seconds, you should hear the contacts of
the switch opening.
3.
Allow the switch to cool. Withins several seconds you
will hear the contacts close. Also check for electrical
continuity across the switch terminals to ensure
contacts have closed.
FIG. 10
BACKFLASH SWITCH
SCREW
TAB
SCREW
TAB
SWITCH
14
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Summary of Contents for CP155
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