VERTICAL MULTISTAGE PUMPS
9
FIELD WIRING. All wiring connections and wiring sizes must
meet National Electrical Code and local requirements.
MOTOR PROTECTION. See the motor nameplate for electrical
connection/wiring diagram.
Pentair pumps must be used with the proper size and type of motor
starter to ensure protection against damage from low voltage,
phase failure, current imbalances, and overloads. The overload
should be sized to trip at the full-load current rating of the motor.
OPERATION:
PRIMING.
NOTICE: Under no circumstances should the pump be operated
without flow through the pump. Never operate the pump dry.
Operation of closed systems or open systems with the liquid
level above the pump priming plug:
1. Close the discharge isolating valve and loosen the needle
valve located in the assembly in the pump head (Figure 8).
Do not remove the needle valve.
NOTICE: On PVM(X)2/4 models, remove the coupling guard
for access to the vent plug.
2. Slowly open the isolation valve in the suction pipe until a
steady stream of liquid runs out the vent in the priming port.
3. Tighten needle valve to 25 in.-lbs. Completely open isolation
valves.
NOTICE: Please turn to Starting before proceeding any further.
Operation of open systems with the liquid level below the top
of the pump:
NOTICE: The suction pipe requires a check valve or isolation
valve.
1. Close the discharge isolation valve.
2. Remove the vented priming plug.
3. Pour liquid through the priming port until the suction pipe
and the pump are completely filled with liquid.
4. Replace the vented priming plug and tighten it securely.
5. Repeat steps 1–4 until the pump is primed.
NOTICE: Please turn to Starting before proceeding any further.
CHECKING DIRECTION OF ROTATION. NOTICE: Do not
disconnect the motor from the shaft to check the direction of
rotation. If you remove the coupling, then you must adjust the
shaft position when you reinstall it. This must be done before
starting the pump.
Arrows on the pump head show the correct direction of
rotation. When seen from the motor fan, the pump should rotate
counterclockwise (
). For pump motors without a fan, remove
one of the coupling guards and look at the coupling to determine
the direction of rotation. Turn off the pump and replace coupling
guard.
NOTICE: Do not check the direction of rotation until the pump
has been filled with liquid. See Priming.
1. Switch power off.
2. Remove the coupling guard and rotate the pump shaft to be
certain it can turn freely. Replace the coupling guard.
3. Verify that the electrical connections are in accordance with
the wiring diagram on the motor.
4. If the fan is visible, turn on and off to verify rotation.
5. To reverse the direction of rotation, first switch OFF the
power supply.
6. On three-phase motors, switch 2 of the 3 power leads on
the load side of the starter. On single-phase motors, see the
connection diagram on the motor nameplate. Change the
wiring as indicated.
Warning: Hazardous Pressure
Do not run the pump with the discharge valve closed; the
water in the pump may boil, causing risk of explosion and
steam burns to anyone nearby.
Warning: Hazardous Voltage
Disconnect all power to the pump before servicing or working
on the pump. Make sure that the power is locked out and that
the pump cannot be accidentally started.
Vented
Priming
Plug
Drain
Plug
Back off needle valve
to vent air. Retighten
to 25 in.-lbs. when vent
port runs a steady stream
of water.
Figure 8. Priming and drain plugs.
Warning: Risk of Water Damage and Injury
Watch the direction of the priming plug and make sure that the
liquid escaping from it does not injure persons nearby or damage
the motor or other components. In hot water installations, pay
particular attention to the risk of injury from scalding hot water.
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