Electrical Connections; Checking Of Direction Of Rotation; Starting; Priming - Grundfos CHV 2-40 Montage- Und Betriebsanleitung

3. Electrical connections

The electrical connections should be carried out in
accordance with local regulations.
The operating voltage and frequency are marked on
the nameplate. Please make sure that the motor is
suitable for the electricity supply on which it will be
used.
Never make any connections in the pump
terminal box unless the electricity supply
has been switched off.
The pump must be connected to an
external mains switch.
Single-phase motors incorporate a thermal
overload switch and require no additional motor
protection.
Three-phase motors must be connected to a motor
starter, the set nominal current of which must
correspond to the electrical data on the pump
nameplate.
Do not start the pump until it has been filled with
liquid.
Connections should be made as shown on the inside
of the terminal box cover.
Choose one of the two cable entries and knock out
the pre-cut disk.

3.1 Checking of direction of rotation

(Three-phase motors)
Arrows on the motor fan cover indicate the correct
direction of rotation.
The pump should rotate counter-clockwise when
viewed from the motor end.
To reverse the direction of rotation, switch off the
electricity supply and interchange any two of the
incoming supply wires.

4. Starting

4.1 Priming

Do not start the pump until it has been filled with
liquid and vented.
In systems with hot liquids, extreme
caution should be exercised when venting
the pump to eliminate the risk of personal
injury caused by escaping water.
Booster systems and systems where the liquid
level on the suction side is above the pump inlet:
1. Close the isolating valves either side of the
pump.
2. Remove the priming plug P, fig. 5.
3. Slowly open the suction valve and keep it open
until a steady stream of liquid runs out the
priming port.
4. Close the valve, replace the priming plug and
tighten securely.
5. Open the suction valve.
6. Start the pump and slowly open the discharge
valve until it is fully open.
Fig. 5
Pumping from tanks and wells where the liquid
level on the suction side is below the pump inlet:
1. Close the discharge isolating valve.
2. Remove the priming plug P, fig. 5.
3. Pour water through the priming port. Make sure
that the suction pipe and pump are completely
filled with liquid and vented.
4. Replace the priming plug and tighten securely.
5. Start the pump and slowly open the discharge
valve until it is fully open.

4.2 Frequency of starts and stops

Maximum 100 starts per hour.
P
9