2.11.1
Feed Pumps
Shall be positive displacement type with an adjustable capacity and
discharge pressure not less than 1.5 times the line pressure at the point
of connection. Provide with pressure relief valve, and check valve mounted
in the pump discharge.
2.11.2
Tanks
Construct of high density polyethylene, cylindrical in shape, and with a
hinged cover. The tank shall have sufficient capacity to require
recharging only once per 7 days during normal operation. Provide tank with
a valved cold water line and, if necessary, a valved hot water fill line
with suitable air gap. Provide tank with device to indicate quantity of
solution in the tank. Provide electric mixing device with tank.
2.11.3
Valve Injection Assembly
Provide for each feed pump. Construct of bronze or material suitable for
chemicals being used and install in condenser water line common to all
pumps. Injection fitting shall have male pipe threads. Each assembly
shall include a shut-off valve and a check valve installed close to
condenser water line.
2.11.4
Bleed-off Solenoid Valve
Provide in bleed-off line. Valve shall normally be in closed position and
be opened by a 120 volt waterproof solenoid coil. Connect bleed-off line
to condenser water line and include a gate valve ahead of solenoid valve.
Extend a discharge line from solenoid valve to sewer drain.
2.11.5
Water Meter
Provide with electric contacting register, and remote accumulative counter
and installed in make-up water line near cooling tower. Meter shall be
standard standard product used in water treatment.
2.11.6
Timers
Shall be automatic reset, adjustable type, and electrically operated. House
in metal NEMA type cabinet with a hinged front. Timer shall be suitable
for 120 volt current.
2.11.7
Conductivity Controller
Controller shall measure the total dissolved solids in system water by
conductivity. The conductivity sensor shall consist of epoxy insulated
carbon electrodes and shall not require platinizing. Controller shall have
a meter with a visual readout, set point adjustment with a range between
200 micromhos/cm and 4000 micromhos/cm and a red pilot light indicating
water conductivity above set point. Unit shall operate from a 120 volt
power source.
2.11.8
Control Panel
Provide a factory-wired, NEMA 12, control panel for each system. Construct
of steel with hinged door and lock, and suitable for surface mounting.
Pre-wire controls to numbered terminal strips. Provide laminated plastic
nameplates identifying the switch function. Include the following with the
SECTION 15602N
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