PURGING BLOWER (EXHAUST FAN).
Check that exhaust louvers open and close.
Check that baffle plate, fan guard and attaching hardware are
Check that fan is activated when switch (S3) is energized.
d. Check that fan operates and louvers open to exhaust position
when zero adjust shaft is turned clockwise to energize the gas alarm
A troubleshooting chart for the fan is
listed in table 3-2.