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9.11 Position of terminal box
The motor terminal box can be turned to any of four positions in
steps of 90 °.
To rotate the terminal box, remove the four bolts securing the
motor to the pump but do not remove the coupling. Turn the motor
to the desired position; replace and securely tighten the four
bolts. See fig. 7.
Discharge
Position 12:00
Position 9:00
Suction
Motor terminal box positions (top view)
Fig. 7
9.12 Field wiring
Lead sizes should be based on the current carrying properties of
conductors required by the latest edition of the National Electrical
Code or local regulations.
10. Commissioning and start-up
10.1 Priming
To prime the pump in a closed system or an open system where
the water source is above the pump, close the pump isolating
valve(s) and open the priming plug on the pump head. See fig. 8,
fig. 8, and fig. 9.
Drain plug
Bypass
valve
Suction
Drain plug
Position of plugs and valve
Fig. 8
Loosen
center plug
to vent
pump
Vent plug
Fig. 9
Position 3:00
Standard terminal
box position (6:00)
Priming vent plug
CR(I)(N) 1s, 1, 3, 5,
10, 15
Discharge
Vent plug
Gradually open the isolating valve in the suction line until a
steady stream of airless water runs out of the priming hole.
Close the plug and tighten securely. Completely open the
isolating valves.
In open systems where the water level is below the pump inlet,
the suction pipe and pump must be filled with liquid and vented
before starting the pump. Close the discharge isolating valve and
remove the priming plug. Pour water through the priming hole
until the suction pipe and pump are completely filled with liquid.
If the suction pipe does not slope downwards away from the
pump, the air must be purged while priming the pump.
Replace the priming plug and tighten securely.
Follow these steps:
1. Switch off the power supply.
2. Check to make sure the pump has been filled and vented.
3. Remove the coupling guard and rotate the pump shaft by
hand to make sure it turns freely.
4. Verify that the electrical connections are in accordance with
the wiring diagram on the motor.
For CR, CRI, CRN 1s to 5 it is advisable to open
the bypass valve during start-up. See fig. 8.
The bypass valve connects the suction and
Note
Note
discharge sides of the pump, thus making the
filling procedure easier. Close the bypass valve
when operation is stable.
Motors should not be run unloaded or uncoupled
from the pump at any time; damage to the motor
Caution
bearings will occur.
Do not start the pump before priming or venting
the pump. See fig. 15. Never let the pump run dry.
10.2 Operating parameters
CR multi-stage centrifugal pumps installed in accordance with
these instructions and sized for correct performance will operate
efficiently and provide years of service. The pumps are water-
lubricated and do not require any external lubrication or
inspection. The motors may require periodic lubrication as
described in section 12. Maintaining the motor.
Under no circumstances should the pump be operated for any
prolonged periods of time without flow through the pump.
This can result in motor and pump damage due to overheating.
A properly sized relief valve should be installed to allow sufficient
liquid to circulate through the pump to provide adequate cooling
and lubrication of the pump bearings and seals.
10.3 Frost protection
If the pump is installed in an area where frost could occur, the
pump and system should be drained during freezing
temperatures to avoid damage. To drain the pump, close the
isolating valves, remove the priming plug and drain plug at the
base of the pump. Do not replace the plugs until the pump is to be
used again. Always replace the drain plug with the original or an
exact replacement. Do not replace with a standard plug.
Internal recirculation will occur, reducing the output pressure and
flow.
13
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