Finish Thompson DB6, 6H, 7, 8, 9, 10 Series - Manual (Page 7)

Section II – Installation
Mounting
Motor feet should be securely fastened to a solid foundation.
Note: Shims are required for the motor feet on ALL 63, 71 and 80
frame motors and 90 frame B5 motors.
Instructions for horizontal discharge installation:
The pump ships from the factory with the discharge in a vertical orien-
tation. These instructions allow a horizontal discharge.
1. Remove (4) clamp ring bolts, lock washers and flat washers (items
20, 19, 18). Rotate clamp ring clockwise 90º from the motor end.
2. Reinstall (4) clamp ring bolts, lock washers and flat washers.
Tighten to 60 in-lb (6.8 N-m).
Note: If the pump has the optional o-ring sealing option (avail-
able on 56C and 145 frame pumps only), make sure o-ring is
properly seated in the groove after the clamp has been rotated.
Note: When the pump discharge is in a horizontal configuration,
the motor must be shimmed to raise the front of the pump to
avoid interference.
Piping
Caution: The NPSH available must be greater than the NPSH
required. Filters, strainers and any other fittings in the suction line will
lower the NPSH available and should be calculated into the application.
· Install the pump as close to the suction source as possible.
· Support the piping independently near the pump to eliminate any
strain on the pump casing. In addition, the piping should be aligned
to avoid placing stress on the pump casing.
· The suction side of the pump should be as straight and short as
possible to minimize pipe friction.
· Keep bends and valves at least ten pipe diameters away from the
suction and discharge.
· The suction line should be at least as large as the suction inlet port
or one pipe size larger so that it does not affect the NPSHa. Do not
reduce the suction line size.
· The suction line should not have any high spots. This can create air
pockets. The suction piping should be level or slope slightly upward
to the pump.
· A check valve and control valve (if used) should be installed on the
discharge line. The control valve is used for regulating flow. An
isolation valves on the suction and discharge are used to make the
pump accessible for maintenance. The check valve helps prevent
the pump against damage from water hammer. This is particularly
important when the static discharge head is high.
· If flexible hose is preferred, use a reinforced hose rated for the
proper temperature, pressure and chemical resistance to the fluid
being pumped.
· The suction valve must be completely open to avoid restricting the
suction flow.
· It is advisable to install a flush system in the piping to allow the
pump to be flushed before the pump is removed from service.
Note: The pump is provided with a provision for a customer
installed ¼” drain in the impeller housing. See the Drain Installation
Section for details.
· For units in a suction lift system, install appropriate piping in the
discharge to allow priming of the pump (DB models are not self-
priming).
· When installing pumps with flanges, we recommend the use of low
seating stress gaskets such as Gore-Tex® or Gylon® (expanded
PTFE)
Motor/Electrical
Install the motor according to NEC requirements and local electrical
codes. The motor should have an overload protection circuit.
Wire the motor for clockwise rotation when facing the fan end of the
motor.
CAUTION: Do not operate the pump to check rotation until the
pump is full of liquid.
Check all electrical connections with the wiring diagram on the motor.
Make sure the voltage, frequency, phase and amp draw comply with
the supply circuit.
If utilized, verify that the power monitor has been properly installed
according to the manufacturers instructions.
To verify correct rotation of the motor:
1. Install the pump into the system.
2. Fully open the suction and discharge valves.
3. Allow fluid to flow into the pump. Do not allow the pump to run
dry (ceramic, PTFE and silicon carbide bushings can’t be run dry
without damage to pump components).
4. Jog the motor (allow it to run for 1-2 seconds) and observe the
rotation of the motor fan. Refer to the directional arrow molded
into the pump casing if necessary.
Note: A pump running backwards will pump but at a greatly
reduced flow and pressure.
Section III - Start-up and Operation
1. This pump must be filled from a flooded suction tank (gravity) or
primed with liquid from an outside source. DB Series pumps are
not self-priming.
2. Open the inlet (suction) and discharge valves completely and al-
low the pump to fill with liquid.
3. Close the discharge valve.
4.
Turn the pump on. Slowly open the discharge valve. Adjust the
flow rate and pressure by regulating the discharge valve. Do not
attempt to adjust the flow with the suction valve.
5. Use of a power monitor is strongly recommended for pumps with
ceramic, PTFE or silicon carbide bushings. The power monitor will
stop the pump and help prevent damage if the pump should run dry.
Shutdown
Use the following procedure to shutdown the pump.
1. Slowly close the discharge valve.
2. Turn off the motor.
3. Close the suction valve.
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