Finish Thompson AC8/8H - Manual (Page 7)

Section II - Installation
Pump motor base should be securely fastened to a solid foundation.
CAUTION: The NPSH available to the pump must be greater than the NPSH required. NPSH available should be two feet (.6
meters) greater than NPSH required.
• 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.
• The suction line should not have any high spots. This can create air pockets that can reduce pump performance. The suction
piping should be level or slope slightly upward to the pump.
• If flexible hose is preferred over pipe, use a reinforced hose rated for the proper temperature, pressure and is chemically resistant
against the fluid being pumped.
• The suction valve must be completely open to avoid restricting the suction flow.
• When installing pumps with flanges, we recommend 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.
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.
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 label on
pump housing if necessary.
NOTE: A pump running backwards will pump but at a greatly reduced flow and pressure.
Section III - Start-up and Operation
CAUTION: Do not run the pump dry. This pump should never be started without liquid in the casing. The fluid being transferred
by the pump lubricates the pump components. Even short periods of running the pump dry could damage the pump. It is recom-
mended that run dry protection is used. Optional electronic power monitors are available to help protect against run dry.
1. This pump must be filled from a flooded suction tank (gravity) or primed with liquid from an outside source. The AC6 & 8 pumps
are not self-priming.
2. Open the inlet (suction) and discharge valves completely and allow 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.
Shutdown
1. Use the following procedure to shutdown the pump.
2. Slowly close the discharge valve.
3. Turn off the motor.
4. Close the suction valve.
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