Finish Thompson SP22 Series Self-Priming - Manual (Page 8)

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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 and fill the housing with (2 1/2) US
gallons (9 5 liters) of the service liquid or water Replace fill
plug and tighten until the o-ring is seated
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 has been filled with 2 1/2 gallons (9 5
liters) of service liquid and the fill plug 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
Section IV - Shutdown
Turn off the motor
NOTE: When the pump is stopped without a check valve in the
piping, liquid will flow through the pump returning to the suction
source The SP design allows enough liquid to be retained in the
housing to allow repriming without having to refill with liquid
Flush Systems
CAUTION: Some fluids react with water; use compatible
flushing fluid
1 Turn off the pump
2 Completely close the suction and discharge valves
3 Connect flushing fluid supply to flush inlet valve
4 Connect flushing fluid drain to flush drain valve
5 Open flushing inlet and outlet valves Flush system until the
pump is clean
NOTE: The drain can be used as the flushing drain valve using
appropriate customer supplied fittings Using the drain helps to
promote superior flushing and draining results
strainer must be periodically cleaned to prevent restriction
Strainer hole size should be 1/8” (1 6 mm) with the amount
of open area equal to or greater than 2 times the suction
pipe diameter
• It is recommended that a vacuum/pressure gage be installed
in the suction piping
• For faster priming on installations with high lift, a foot valve
is recommended
• Check and control valves (if used) should be installed on
the discharge line The control valve is used for regulating
flow Isolation valves on the suction and discharge are used
to make the pump accessible for maintenance The check
valve helps protect the pump against damage from water
hammer This is particularly important when the static
discharge head is high
NOTE: If a check valve is used in the discharge line, it must
be placed at a distance at least equal to the maximum suc-
tion 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 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)
• 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” BSPP 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 2 1/2 gallons
(9 5 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 overload
protection circuit
Wire the motor for clockwise rotation when facing the fan
end of the motor