26
EQUIPMENT & OPTIONAL ACCESSORIES
PRESSURE SWITCH
Air pressure switch works on negative pressure. When
blower comes on air pressure switch operates intermittent
pilot and gas valve. Air pressure switch is factory set and
will only work when blower operates properly. It will not
allow boiler to come on if blower does not generate enough
pressure or if venting system is blocked.
Factory Pressure Switch Set point:
-0.4” wc. for 2-5 section boilers.
-0.5” w.c. for 6-7 section boilers.
ROLLOUT SWITCH
(FLAME ROLLOUT SAFETY SHUTOFF)
Rollout switch is temperature-sensitive fuse link device.
Located on boiler base just outside fi re box. In event of
heat exchanger fl ueway blockage causing fl ame to roll
out of fi re box, fuse does not change in appearance when
blown.
If rollout switch blows, it must be replaced with exact
replacement. Check heat exchanger fl ueways for blockage
when restoring system to operating condition. DO NOT
operate system without rollout switch.
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