Cleaning The Filter Basket; Frost Protection; Maintenance And Service; Fault Finding Chart - Grundfos GP 7-44 Montage- Und Betriebsanleitung

7. Cleaning the filter basket

Before starting work on the pump, make
sure that the electricity supply has been
switched off and that it cannot be acciden-
tally switched on.
The filter basket incorporated in the pump should be
checked every day and, if necessary, it must be
cleaned. Before removing the transparent cover,
close the isolating valves on either side of the pump.
After cleaning, the pump must be filled
with water and vented.
The cover must be fitted to the pump.
The pump can then be started.
Note: High-pressure cleaning is not allowed.

10. Fault finding chart

Before removing the terminal box cover and before any removal/dismantling of the pump, make sure
that the electricity supply has been switched off and that it cannot be accidentally switched on.
Fault
Pump runs but gives no water.
Pump is not operating
satisfactorily.
11. Disposal
Disposal of this product must be carried out accord-
ing to the following guidelines:
1. Use the local public or private waste collection
service.
6

8. Frost protection

Pumps which are not being used during periods of
frost should be drained to avoid damage. To drain
the pump, remove the drain plug in the pump hous-
ing. Do not replace the plug until the pump is to be
used again.
Fig. 2
Drain plug
Drain plug

9. Maintenance and service

Under normal operating conditions, the pump is
maintenance-free. The motor bearings are lubricated
for life.
Cause
a) Supply failure or motor protection has tripped out.
b) The pump has not been vented.
c) The pump has not been filled with water.
d) Leakage in suction pipe/hose.
e) The transparent cover has not been fitted correctly.
– Check the filter basket.
– Tighten the screws evenly.
f) Suction lift is too great.
– Maximum permissible suction lift is 3 metres.
g) Total friction losses in the system exceed the capacity of the pump.
– Make a new calculation of the required pressure.
h) Leakage in mechanical shaft seal.
a) Direction of rotation is incorrect (three-phase pumps only).
– Reverse the direction of rotation.
b) The filter basket in the pump or in the skimmer is dirty or blocked.
– Clean the baskets.
c) The water level in the swimming pool is too low.
– Increase the water level up to the middle of the skimmer opening.
d) The pipes/hoses are partly blocked by impurities.
– Clean the pipes/hoses.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz-
ardous materials from it to your nearest GRUND-
FOS company or service workshop.
Before starting work on the pump, make
sure that the electricity supply has been
switched off and that it cannot be acciden-
tally switched on.
Subject to alterations.