4.3 Priming
If not primed properly, the pump will not
deliver liquid.
Closed systems or open systems where the liquid
level is above the pump inlet (flooded systems)
Fill the inlet pipe and pump with liquid and vent them
before the pump is started. Proceed as follows:
1. Close the outlet isolating or throttle valve.
2. Loosen the vent screw (17) and the plug for shaft
seal flushing (20d).
TM042592
Position of the vent valve and plug for shaft seal
flushing
WARNING
Hot or cold surface
Death or serious personal injury
‐ Pay attention to the direction of the
vent hole, and ensure that the
escaping water does not cause
injury to persons or damage to the
motor or other components.
‐ In hot-water installations, pay
special attention to the risk of injury
caused by scalding hot water and
hot surfaces.
‐ In cold-liquid installations, pay
special attention to the risk of injury
caused by cold liquids and cold
surfaces.
3. Slowly open the isolating valve in the inlet pipe
until a steady flow of liquid runs out of the vent
hole.
4. Rotate the shaft by hand, if possible, while priming
and venting to free entrapped air from the impeller
channels.
5. Tighten the vent screw and completely open the
isolating or throttle valve(s).
Open systems where the liquid level is below the
pump inlet (suction lift systems)
Fill the inlet pipe and pump with liquid and vent them
before the pump is started. Proceed as follows:
Suction lift system with foot valve
1. Close the outlet isolating or throttle valve and
open the isolating valve in the inlet pipe.
2. Remove the vent screw and connect a priming
device to a drain hole.
3. Fill the inlet pipe and casing with liquid at a
pressure of 1 to 2 bar from an external source
until the inlet pipe and pump are completely filled
with liquid.
4. Rotate the shaft by hand while priming and
venting to free entrapped air from the impeller
channels.
5. Refit the vent screw and tighten it securely.
6. You can fill the inlet pipe with liquid and vent it
before you connect the pipe to the pump. You can
also install a priming device before the pump.
Suction lift system without foot valve
1. Connect an external vacuum pump to the vent
hole on the top of the pump casing.
2. Close the outlet isolating or throttle valve and
open the isolating valve in the inlet pipe.
3. Open the valves between the pump and vacuum
pump.
4. Start the external vacuum pump.
5. Pump until the inlet pipe and the pump are
completely filled with liquid.
6. Rotate the shaft by hand while priming and
venting to free entrapped air from the impeller
channels.
7. When the liquid runs out of the vacuum pump,
stop the external vacuum pump and close the
valves between the pump and vacuum pump.
Never let the pump run dry. The pump is
not self-priming.
Dry-running will cause serious damage to
the stuffing boxes, shaft seals, wear rings
and shaft sleeves.
4.3.1 Opening of valves
1. Open the valves for the flushing liquid to the
stuffing boxes.
2. Completely open the isolating valve on the inlet
side of the pump and leave the outlet isolating or
throttle valve partly open.
21
English (GB)
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