Checking The Direction Of Rotation; Starting; Frequency Of Starts And Stops; Maintenance And Service - Grundfos TP Serie Instrucciones De Instalación Y Funcionamiento

7.2 Checking the direction of rotation

Do not start the pump to check the direction of
rotation until it has been filled with liquid.
The direction of rotation should not be
checked with the motor alone, as an
adjustment of the shaft position is
Note
required when the coupling has been
removed.
The correct direction of rotation is shown by arrows
on the motor fan cover or on the pump housing.

7.3 Starting

1. Before starting the pump, completely open the
isolating valve on the suction side of the pump
and leave the discharge isolating valve almost
closed.
2. Start the pump.
3. Vent the pump during starting by loosening the
air vent screw in the motor stool until a steady
stream of liquid runs out of the vent hole.
See fig. 12.
Warning
Pay attention to the direction of the
vent hole and take care to ensure that
the escaping water does not cause
injury to persons or damage to the
motor or other components.
In hot-water installations, special
attention should be paid to the risk of
injury caused by scalding hot water.
4. When the piping system has been filled with
liquid, slowly open the discharge isolating valve
until it is completely open.
16

7.4 Frequency of starts and stops

Maximum number of starts per hour
Frame
Number of poles
size
2
56-71 100
80-100 60
112-132 30
160-180 15
200-225 8
250-315 4
• On twin-head pumps, the duty and standby pumps
should be alternated on a regular basis, i.e. once
a week, to ensure an even distribution of the
operating hours on both pumps.
Pump change can be effected either manually or
automatically by installing a suitable pump
controller.
• If twin-head pumps are used for pumping
domestic hot water, the duty and standby pumps
should be alternated on a regular basis, i.e. once
a day, to avoid blocking of the standby pump due
to deposits (calcareous deposits, etc.).
Automatic pump change is recommended.

8. Maintenance and service

Warning
Before starting work on the pump,
make sure that the electricity supply
has been switched off and that it cannot
be accidentally switched on.

8.1 Pump

The pump is maintenance-free.
If the pump is to be drained for a long period of
inactivity, inject a few drops of silicone oil on the
shaft between the motor stool and the coupling.
This will prevent the shaft seal faces from sticking.

8.2 Motor

The motor should be checked at regular intervals.
It is important to keep the motor clean in order to
ensure adequate ventilation. If the pump is installed
in a dusty environment, the pump must he cleaned
and checked regularly.
4 6
250 350
140 160
60 80
30 50
15 30
8 12