Finish Thompson SP11/15 SERIES SELF-PRIMING - Manual (Page 9)

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NOTE: If a check valve is used in the discharge line, it must be placed at a distance at least equal to the maximum
suction lift from the pump. If this cannot be done, an air vent must be provided in the discharge line.
• If flexible hose is preferred over pipe, use a reinforced hose rated for the proper temperature, pressure and is chemi-
cally 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).
• 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 1/2” BSP drain in the impeller housing.
• A “tee” can be installed in the discharge piping as an alternative location for filling the housing with fluid before
pump operation.
• “Filling” is defined as filling the housing with 1 US gallon (3.8 liters) of liquid
• “Priming” is defined as evacuating all the air from the suction piping/pump and replacing it with fluid.
Motor/Electrical
Install the motor according to NEC requirements and local electrical codes. The motor should have an over-
load 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. Remove the fill plug (item 3A, 3 next to discharge) and fill the housing with 1 US gallon (3.8 liters) of the service
liquid or water. Replace fill plug and tighten until the o-ring is seated.
NOTE: Use a funnel with flexible spout to fill the housing on pumps equipped with flanges.
3. Fully open the suction and discharge valves.
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 front of the housing if necessary.
NOTE: An SP pump running backwards may not prime.
Section III - Start-up and Operation
1. Be sure the housing (item 1) has been filled with 1 US gallon (3.8 liters) of service liquid and the fill plug (item
3A, 3) has been installed and tightened until the o-ring is seated.
2. Open the inlet (suction) and discharge valves completely.
3. Turn the pump on. Wait for discharge pressure and flow to stabilize (could take several minutes depending upon
suction lift). Adjust the flow rate and pressure by regulating the discharge valve. Do not attempt to adjust the flow
with the suction valve.
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