Operating instructions

Blower (Draft Inducer)
The blower provides a means for pulling air through the boiler and
exhausting the flue gasses into the vent system. The blower shuts off
when the burners are not firing. This keeps heat in the house rather
than having it go up the chimney.
Pressure Switch
The air pressure switch works on a negative pressure. When the
blower comes on the air pressure switch operates the intermittent pi-
lot and gas valve. The air pressure switch is factory set and will only
work when the blower operates properly. It will not allow the boiler
to come on if the blower does not generate enough pressure or if the
venting system is blocked.
Rollout Switch
(Flame Rollout Safety Shutoff)
The rollout switch is a temperature-sensitive fuse link device. It is lo-
cated on the boiler base just outside the fire box. In the event of heat
exchanger flueway blockage causing flame to roll out of the fire box,
the fuse will blow, shutting down the flow of gas to the main burners.
The fuse does not change in appearance when blown.
If the rollout switch blows, it must be replaced with an exact replace-
ment. Check heat exchanger flueways for blockage when restoring
system to operating condition. Do not operate system without a
rollout switch.
Factory Pressure Switch Set point:
-0.4" wc. for 2-5 section boilers.
-0.5" w.c. for 6-7 section boilers.