Bell & Gossett DN0141D Domestic Pump 2′ NPSH Horizontal Pumps Series DB-F - Manual (Page 4)

4
GROUTING
After the pump has been leveled, securely bolted to the floor,
and properly aligned, a good grade of non-shrinking grout
should be poured inside the pump base. To hold wedges or
shims in place, allow the grout to flow around them.
PUTTING THE UNIT INTO SERVICE
1. Assure that the unit is piped in accordance with instructions.
2. Validate that the connected system is ready to operate.
3. Connect electrical supply per National Electrical Code.
4. Install drain plugs.
5. Prime pump and bleed air from system. Avoid freezing
conditions after pump has been primed.
6. Check for proper rotation of all three phase motors.
Rotation must be clockwise looking down on the motor as
indicated by directional arrow on pump casting. If pump
runs backwards, interchange two wires (3 phase only).
7. Throttle plug cock in discharge line until pressure at pump
(while pump is discharging) approaches pump rated pres-
sure. Secure adjustment.
8. Bleed all air from the volute. Where appropriate, use an
air bleed line to a tank ahead of the pump or to the pump
suction.
9. If possible, observe operation thru several cycles.
WARNING: EXPLOSIBLE
Maximum suction pressure is 35 psi unless otherwise
specified by manufacturer. Do not exceed this pressure.
Failure to follow these instructions could result in serious
injury or death.
WARNING: HIGH VOLTAGE
Disconnect and lock out power before connecting or
servicing unit. Failure to follow these instructions could
result in serious injury or death.
CAUTION: DO NOT RUN DRY.
SEAL DAMAGE MAY OCCUR.
Inspect pump seal regularly for leaks. Replace as required.
Failure to follow these instructions could result in injury or
property damage.
CAUTION: DO NOT REVERSE
Reverse operation can cause extensive damage to
pumps. Jog the motor to test for direction of rotation. Failure
to follow these instructions could result in serious injury or
property damage.
ELECTRICAL WIRING & CONTROLS
Connect power wiring per NEC. Recheck nameplate vs. spec-
ifications and conditions. All single phase motors have internal
thermal protection.
Three phase motors must use starters with properly sized over-
load relays. Overload relays furnished are designed for manual
reset.
WARNING: HIGH VOLTAGE ELECTRICITY
Disconnect and lock out power before connecting or
servicing unit. Failure to follow these instructions could
result in serious injury or death.
ROTATION
Pump rotation is clockwise when viewed from back of the
motor. An arrow is also located on the motor bracket or motor
to show the direction of rotation.
PIPING
Always install a section of straight pipe between the suction
side of the pump and first elbow. This reduces turbulence of
the suction by straightening out the flow of liquid before it
enters the pump. The length should be equal to five times the
diameter of the pipe. A Bell & Gossett suction diffuser can be
used if there is not adequate room for a straight suction line.
Be sure to eliminate any pipe-strain on the pump. Support the
suction and discharge pipes independently by use of pipe
hangers near the pump. Line up the vertical and horizontal
piping so that the bolt-holes in the pump flanges match the
bolt-holes in the pipe flanges. DO NOT ATTEMPT TO SPRING
THE SUCTION OR DISCHARGE LINES INTO POSITION.
Bearing wear will result if suction or discharge lines are forced
into position. The code for Pressure Piping (A.S.A.B. 31.1) lists
many types of supports available for various applications.
As a rule, ordinary wire or band hangers are not adequate to
maintain alignment. It is very important to provide a strong,
rigid support for the suction and discharge lines.
Where considerable temperature changes are anticipated,
fittings for absorbing expansion should be installed in the sys-
tem in such a way as to avoid strain on the pump.
A check valve and an isolation/throttling valve should be
installed at the discharge of the pump.
NOTES:
1. When installing the pump, suction and discharge gauge
ports should be installed in the pipeline.
2. The pipeline should have isolation valves around the pump
and have a drain valve in the suction pipe.
3. When installing the suction and discharge connections to a
threaded pump housing the use of PTFE tape sealer or a
high quality thread sealant is recommended.