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24
where conditions warrant) to fl ush out the sediment
chamber so the device will be free to function properly.
Low water fuel cutoffs and water feeders should be
dismantled annually by qualifi ed personnel, to the
extent necessary to insure freedom from obstructions
and proper functioning of the working parts. Inspect
connecting lines to boiler for accumulation of mud,
scale, etc. and clean as required. Examine all visible
wiring for brittle or worn insulation and make sure
electrical contacts are clean and that they function
properly. Give special attention to solder joints on
bellows and fl oat when this type of control is used.
Check fl oat for evidence of collapse and check mercury
bulb (where applicable) for mercury separation or
discoloration. Probe type low water cutoff should be
removed once a year, examined and cleaned of any
dirt accumulations to assure proper operation. Do not
attempt to repair mechanisms in the fi eld. Complete
replacement mechanisms including necessary gaskets
and installation instructions are available from the
manufacturer.
9 LUBRICATION
There are no parts requiring lubrication on the part of
the serviceman or the homeowner. Circulator bearings
are water lubricated. Fan motor bearings are factory
sealed.
Figure 16
CLEANING OF VENT SYSTEM, BOILER FLUES, AND BURNERS