shall be provided with a pressure gauge as specified. The [boiler] [hot
water] circulating pump discharge heater shall be provided with a [flow
switch] [pressure switch]. [Flow switch unit shall be a self-contained
swinging vane type to indicate fluid flow.] [Pressure switch unit shall be
a self-contained snap action type to indicate fluid pressure.] Switch
shall be a SPDT with 120-volt, 15-ampere rating.
2.4.3
Condensate Pumping Unit
**************************************************************************
NOTE: If steam is utilized, only one type of
condensate return unit will be required; delete
either the condensate pumping unit or the vacuum
pumping unit. Delete this paragraph if hot water is
utilized.
**************************************************************************
Each pump shall have a capacity not less than that indicated when
discharging against the specified pressure. The minimum capacity of the
tank shall be as indicated. The condensate pumping unit shall be the
[single] [duplex] [horizontal shaft] [vertical shaft] type as indicated.
The unit shall consist of [one pump] [two pumps] with electric motor drive,
and a single receiver, all mounted on a suitable cast-iron or steel base.
The motor may be mounted on the top of the receiving tank. Pump shall be
the centrifugal or turbine type, bronze-fitted throughout, with impellers
of bronze or other approved corrosion-resisting metal. Pump shall be free
from air binding when handling condensate of temperatures up to 93 degrees
C 200 degrees F. Pump shall be directly connected to suitable drip-proof
enclosed motors. Receiver shall be cast iron or not less than 4.75 mm 3/16
inch thick black iron or steel and shall be provided with all the necessary
reinforced threaded openings, including condensate return, vent, overflow,
and pump suction connections. Inlet strainer shall be provided either
integral in the tank or separate in the inlet line to the tank. Vent pipe
shall be galvanized steel, and the fittings shall be galvanized malleable
iron. Vent pipe shall be extended through the roof and shall be properly
flashed. The pump, motor, and receiving tank may be mounted on a single
base with the receiver piped to the pump suctions. A gate valve and check
valve shall be provided in the discharge connection from each pump and a
strainer and gate valve shall be provided in the suction line to each pump
except where pumps are directly mounted on top of the receiver.
2.4.3.1
Controls for Space Heating Steam Loads Only
**************************************************************************
NOTE: For loads where space heating is only part of
the steam load, delete this paragraph.
**************************************************************************
An enclosed float switch complete with float mechanisms shall be installed
in the head of the receiver. Each condensate pump shall be controlled by a
float switch which shall automatically start the motor when the water in
the receiving tank reaches the high level and stop the motor when the water
reaches the low level. The motors shall be provided with magnetic
across-the-line starters equipped with general-purpose enclosures and
three-position, "Manual-Off-Automatic" selector switches in the cover.
Automatic alternator shall be provided for duplex units.
SECTION 15569A
Page 33
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