Startup; Filling The Pump With Water; Caution; Shaft Seal Run-In - Grundfos JP 5 Installation And Operating Instructions Manual

7. Startup

Warning
Do not start the pump until it has been
filled with liquid.
The pump must not run without delivering

Caution

water for more than four minutes.

7.1 Filling the pump with water

1. Remove the plug (P). See fig. 5.
2. Fill the pump with water.
3. Refit the plug and tighten it using fingers only.
The pump can now be started.
T
Fig. 5 Filling the pump with water
If there is a suction lift, up to four minutes may pass
from the moment the pump is started until it delivers
water. This period depends on the length and
diameter of the suction pipe.
When the pump is delivering water without air, you
may turn the ejector valve to position 2. See fig. 4.

7.2 Shaft seal run-in

The seal faces are lubricated by the pumped liquid,
meaning that there may be a certain amount of
leakage from the shaft seal.
When the pump is started up for the first time, or
when a new shaft seal is installed, a certain run-in
period is required before the leakage is reduced to
an acceptable level. The time required for this
depends on the operating conditions, i.e. every time
the operating conditions change, a new run-in period
will be started.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
P
S
V
8. Maintenance
If the pump has been used for dirty liquids, e.g. pool
water, it must be flushed through with clean water
immediately after use.

8.1 Cleaning the pump

It is only necessary to clean the pump if it does not
work as intended and flushing it with clean water did
not eliminate the problem.
Warning
Before starting work on the product, switch
off the power supply. Make sure that the
power supply cannot be accidentally
switched on.
The position numbers mentioned in the following
sections refer to fig. 6.
8.1.1 Dismantling
1. Pumps with ejector valve: Turn the ejector valve
to pos. 1. See fig. 4.
2. Drain the pump by removing plug (pos. 25) or
ejector valve (pos. 25a).
Warning
Make sure that the escaping hot or cold
liquid does not cause injury to persons or
damage to the equipment.
3. Remove screw (pos. 93) and clamp (pos. 92)
holding pump sleeve (pos. 16).
4. Push pump sleeve (pos. 16) free of the motor
stool with a screwdriver and take it off.
5. Pull ejector (pos. 14) out of the pump sleeve.
6. Clean the ejector and the pump sleeve using a
soft brush or a water jet.
7. Check if impeller (pos. 49) is dirty. If that is the
case, clean the impeller (in place) using a soft
brush or a water jet. See fig. 7.
To prevent the impeller and shaft from rotating,
hold the motor fan blades.
Caution Do not use a high-pressure jet cleaner.
7