Pentair JUNG PUMPEN MULTIFREE 25/2 AW Instructions De Service page 12

ENGLISH
Tightening
Gap dimen- Pump
torque of the
sion X type
impeller screw
2 mm AW 65 Nm
2 mm BW1 65 Nm
2 mm CW1 65 Nm
3 mm CW2 160 Nm
Replacing the impeller
Worn impellers can have sharp
edges.
1. Remove the 4 hexagonal screws and
lift the motor unit off the ring housing.
2. Block the impeller to prevent it from
turning.
3. Loosen the central impeller screw lo-
cated in the impeller hub.
4. Loosen the impeller by knocking it
gently with a hammer and then slide it
off the shaft.
5. Clean all the parts of the impeller
mounting.
6. Grease the shaft cover on the inside.
ATTENTION! Do not use grease con-
taining graphite, (e.g. "Molykote").
7. Fix all the parts of the impeller
mounting in place and tighten the im-
peller screw until it is "hand tight".
8. Slide the new impeller over the pre-
assembled impeller mounting onto the
shaft.
9. Set the gap dimension x and then
tighten the impeller screw securely.
10. Mount the motor unit on the ring
housing; the cable entry point is oppo-
site the discharge branch.
12
WHAT TO DO IN THE
EVENT OF ANY
PROBLEMS
Pump does not work
∙ Check mains current (do not use a
pin gauge)
∙ Fuse faulty = may be too weak (please
refer to Electrical Connection)
∙ Mains supply cable damaged = repair
to be carried out by manufacturer
only
Pump runs but does not pump
∙ Empty pressure pipe or hose to allow
the non-return valve to open and let
the air escape from the ring housing.
∙ Ventilate the pump housing by un-
screwing the "Luft" (air) sealing
screw.
The impeller is blocked
∙ Solids and fibrous matter have be-
come lodged in the ring housing
(please refer to Maintenance)
Decreased pumping performance
∙ The impeller is blocked (please refer
to maintenance)
∙ The impeller is worn out = replace it
∙ Wrong direction of rotation = change
2 phases of the power supply