Crown Boiler 24-07 - Manual (Page 56)

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2. FLOAT TYPE LOW WATER CUTOFF
During the heating season, if an external low water
cutoff is on the boiler, the blow off valve should
be opened once a month (use greater frequency
where conditions warrant) to flush out the sediment
chamber so the device will be free to function
properly.
Low water cutoffs and water feeders should be
dismantled annually by qualified 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 float when this type of control
is used. Check float for evidence of collapse and
check mercury bulb (where applicable) for mercury
separation or discoloration. DO NOT ATTEMPT
TO REPAIR MECHANISMS IN THE FIELD.
Complete replacement mechanisms, including
necessary gaskets and installation instructions, are
available from the manufacturer.
D.
CHECK BURNER AND CONTROLS at least once
a year. See Section IV - Operating Instructions, Step J
for control checks. See Burner Manual for burner tests
and adjustments.
E. LUBRICATE BOILER COMPONENTS according
to manufacturer’s instructions. Generally, this involves
the oil burner and circulator. This includes the type of
lubricant to use, frequency of lubrication, and points to
lubricate.
F.
GENERAL MAINTENANCE CONSIDERATIONS
1. Keep radiators and convectors clean.
2. If a hot water radiator is hot at the bottom but not at
the top, it indicates that air has accumulated inside
and should be vented. To vent radiator, hold small
cup under air vent (located near top of radiator),
open vent until water escapes and then close.
3. If much water is added to system, it is advisable to
heat system to a high temperature and vent again.
This will make less venting necessary during the
winter.
4. Where an expansion tank is used, make sure that
neither the tank nor its drain pipe is exposed to
freezing temperatures. Never place valves in piping
leading to or from expansion tank.
5. Boiler and system cleaning will help assure
trouble free operation. See Section IV - Operating
Instructions, Steps K or L for procedure.
G.
ATTENTION TO BOILER WHILE NOT IN
OPERATION
WARNING
If boiler is not used during winter time, it
must be fully drained to prevent freeze
damage.
1. Spray inside surfaces with light lubricating or
crankcase oil using gun with extended stem so as to
reach all corners.
2. With steam boilers, at end of season add sufficient
water to fill boiler to top of water column and leave
it that way until fall when water should be drained
again to proper level. If at this time boiler water is
dirty, drain water, flush out boiler, and refill with
clean water to prescribed water level.
3. Always keep the manual fuel supply valve shut off
when the burner is shut down for an extended period
of time.
4. To recondition the heating system in the fall season
after a prolonged shut down, follow the instructions
outlined in Section IV - Operating Instructions,
Steps B through L.