Grundfos Fire NKF, Installation And Operating Instructions Manual

Page: 19 / 388

English (GB)
19
Checking the alignment
1. Disconnect the negative pole of the starter battery.
2. Remove the coupling guard.
3. Measure the distance "Z" at the rubber element of all axial
bolts. See fig. 17. The distance must be 50 mm for Clarke
diesel engine JU4H/JU6H and 52.5 mm for Clarke diesel
engine JW6H (other diesel engines on request).
If the alignment is correct, proceed with step 4;
otherwise align pump and engine.
4. Refit the coupling guard.
5. Reconnect the negative pole of the starter battery.
Aligning pump and engine
Fig. 18
Axial and radial fixation of the clamping hub
1. Unscrew the axial and radial bolts from the coupling and push
the clamping hub on the shaft in the direction of the pump.
2. Loosen the screws of the pump foot.
3. Align the pump foot using shims or foil plates.
4. Tighten the screws of the pump foot.
5. Push the clamping hub on the shaft in the direction of the
engine and reinsert and tighten axial and radial bolts.
Always insert the axial bolts first.
6. Check the alignment again.
10.6 Pipe connection
The pipes must be installed as straight as possible and be of an
adequate size. Take the pump inlet pressure into consideration.
Install the pipes so that air locks are avoided. This applies
especially to the suction side of the pump. See fig. 19.
Fig. 19
Installation of pipes
Secure the pipes close to the pump on the suction and discharge
side with pipe brackets attached to the building (wall, ceiling,
floor). See fig. 20.
The pipes should lie true against the pump flanges without being
stressed. Otherwise, the pump may be damaged.
Fig. 20
Fixing points of the pipes
Install isolating valves on both sides of the pump.
Connect the suction pipe to the horizontal pump port and the
discharge pipe to the vertical pump port.
Warning
Disconnect the battery cable before you remove
the coupling guard.
Beware of the sharp edges of the coupling guard.
Wear protective gloves.
Caution
Axial and radial bolts can be reused maximum
three times.
Do not use threadlocker as it may damage the
rubber material.
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Caution
The pipework must not stress the pump housing
or transfer any forces to the pump housing.
See permissible flange forces and torques in
section 8.1 Pump.
Note
Pump set with diesel engine:
The suction pipe must have one port for
connecting the additional copper pipe for the
cooling loop. See section 10.9 Connecting the
cooling system.
Note
The discharge pipe must have a port for venting
and priming the pump.
See section 12.1 Preparations before start-up.
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