Starting Up The Product; Dry Running; Before Starting An Atex-Approved Pump - Grundfos NB Instrucciones De Instalación Y Funcionamiento

5. Starting up the product

WARNING

Dry running

Death or serious personal injury
- Make sure that the pump is filled with
pumped liquid during operation.
5.1 Before starting an ATEX-approved
pump
Strictly observe the following check list.
1. Compare the order with the supplied pump and
motor. Check that the EPL of the pump and motor
(Equipment Protection Level) corresponds to
what is ordered. If the EPL of the motor and
pump differs from each other or the temperature
class of the motor differs from that of the pump,
the following applies:
– The EPL which defines the lower protection
level applies. Example: The EPL of the motor
is Gc and the pump's is Gb. Gc applies.
– The temperature class which defines the
higher temperature applies.
Example 1: Motor temperature class is T4 (135
°C), and pump temperature class is T3 (200
°C). T3 (200 °C) applies.
Example 2: Motor temperature class is T3 (200
°C), and pump temperature class is T4...T3.
T3 (200 °C) applies.
2. Check that the pumped liquid and its operating
temperatures are in accordance with what is
stated on the "key application data sheet".
3. Check that the shaft seal and rubber parts of the
pump are as ordered. See the nameplate.
Fig. 7 Example of code for rubber parts on the
NB, NBG nameplate
T P 1 5 0 - 3 6 0 / 4 A - F - B - Q Q E
Fig. 8 Example of code for rubber parts on the
TP nameplate
10
The key to the nameplate is shown in the installation
and operating instructions for the standard pump.
4. Check that the maximum speed on the pump
nameplate corresponds to the speed of the motor
and that the pump will not be used for operation
with a frequency over 60 Hz.
5. Check that the pump has been filled with liquid
and is vented.
Fig. 9 Location of vent screws
6. Check that the shaft can rotate freely. There must
be no mechanical contact between impeller and
pump housing.
7. Check the direction of rotation. The correct
direction of rotation is shown by an arrow on the
pump housing.
8. Before start and during operation, make sure that
the pump does not leak or have any
malfunctions.
9. The pump must be re-vented in these cases:
– The pump has been stopped for a period of
time.
– Air or gas has accumulated in the pump.