2.4.3.2
Space Heating and Steam Loads or Distribution Lines
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NOTE: For space heating loads only, delete this
paragraph.
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The condensate pump shall be provided with an approved float-actuated valve
or water feeder in the cold-water makeup connection either external to or
integral with the receiver. Where a de-aerating feedwater heater is not
included, the condensate pumping unit shall be controlled automatically by
a pump controller with low-water cutout on each boiler. The pump
controller and low-water cutout shall have two float-operated mercury
switches arranged to start and stop the condensate pump at preset boiler
water levels. One switch shall control the operation of the condensate
pump by starting the pump when the water in the boiler reaches a preset low
level and by stopping the pump when the water in the boiler rises to a
preset high level. The second switch shall ring an alarm bell and
simultaneously shut down the burner. Relays shall be provided if
necessary. A minimum 100 mm 4 inch alarm bell with bell-ringing
transformer shall be installed where directed. A gate valve and a check
valve or a stop-check (nonreturn) valve shall be installed in the feed line
between the boiler and the pump adjacent to the boiler connection. The
condensate pump motor shall be provided with a magnetic, across-the-line
starter equipped with thermal-overload protection conforming to the
requirements of paragraph ELECTRICAL EQUIPMENT. Where two or more boilers
are provided, a pump controller and low-water cutout shall be installed at
the normal waterline of each boiler. An automatic feed valve shall be
installed in the feed line to each boiler. When any boiler requires water,
the pump controller shall open the feed valve by actuating an end switch
which, in turn, operates the condensate pump. When the normal water level
is restored, the pump controller shall close the feed valve, and the end
switch of the valve shall stop the condensate pump.
2.4.3.3
Rating and Testing
The pump manufacturer shall submit a certified test report covering the
actual test of the unit and certifying that the equipment complies with the
indicated requirements.
2.4.4
Vacuum Pumping Unit
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NOTE: Delete this paragraph if hot water is
utilized.
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The vacuum pumping unit shall be a combination air removal and condensate
return unit consisting of [a single pump, electric motor, and receiving
tank] [pumps, electric motors, and other functioning parts in duplicate and
a single receiving tank] as indicated. Two interconnected single units
will be acceptable in place of a duplex unit. The unit shall be arranged
for automatic operation. Where duplicate pumps are used, one pump shall
serve as a standby. Where it is standard with the manufacturer, separate
pumps may be used for air removal and condensate return if both pumps are
mounted on a common receiver. The receiver shall be constructed of cast
iron, or of not less than 4.75 mm 3/16 inch thick black iron or steel. The
pumping unit shall be bronze fitted throughout with bronze shafts or with
shafts protected by bronze sleeves. Pumps, motors, and receiver shall be
SECTION 15569A
Page 34
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