Grundfos Hydro Multi-E Montage- Und Betriebsanleitung Seite 11

7. Start-up
Do not start the pumps until they have been filled
Caution
with liquid.
Warning
When pumping hot liquids, ensure that persons
cannot accidentally come into contact with hot
surfaces of the product.
7.1 Hydro Multi-E in system with positive inlet
pressure
When you have carried out the mechanical and electrical
installation described in section
follows:
1. Check that the Hydro Multi-E corresponds to order and that no
single parts have been damaged.
2. Switch off the main switch.
3. Switch off the circuit breakers of all pumps.
4. Check that the precharge pressure in the diaphragm tank is
0.7 times the required discharge pressure (setpoint).
Measure the precharge pressure while the
Note
system is pressureless.
5. Connect water and power supplies to the system.
6. Open all pump suction and discharge valves.
7. Vent all pumps by means of the air vent screws.
Fig. 16 Position of air vent screws in systems with CME-A/-I
pumps
Air vent screws
Fig. 17 Position of air vent screws in systems with CR(I)E
pumps
8. Switch on the main switch.
9. Start pump 1 by switching on the circuit breaker.
10. Vent pump 1 by means of the air vent screw.
11. Repeat steps 9 and 10 for the other pumps in the system.
12. Set the desired discharge pressure.
6. Installation, proceed as
Air vent screws
If you change the discharge pressure, you must
change the diaphragm tank precharge pressure
Note
accordingly.
13. Check that the pumps are cutting in and out, thus adjusting
the performance to the demand.
Hydro Multi-E is now in automatic mode and ready for operation.
7.2 Hydro Multi-E in system without inlet pressure
Hydro Multi-E systems with CME pumps require a
positive inlet pressure during start-up and
Caution
operation. The following start-up procedure
therefore only applies to Hydro Multi-E systems
with CRE or CRIE pumps.
When you have carried out the mechanical and electrical
installation described in section
follows:
1. Check that the Hydro Multi-E corresponds to order and that no
single parts have been damaged.
2. Switch off the main switch.
3. Switch off the circuit breakers of all pumps.
4. Check that the precharge pressure in the diaphragm tank is
0.7 times the required discharge pressure (setpoint).
Measure the precharge pressure while the
Note
system is pressureless.
5. Connect water and power supplies to the system.
6. Open all pump suction valves.
7. Close all pump discharge valves, and prime all pumps and the
suction pipe.
Air vent screws
Fig. 18 Position of air vent and filling screws
8. Switch on the main switch.
9. Start pump 1 by switching on the circuit breaker.
10. Vent the pump by means of the air vent screw.
11. Slowly open the discharge valve approximately 50 %.
12. Repeat steps 9 and 11 for the other pumps in the system.
13. Slowly fully open all pump discharge valves.
14. Wait for a few minutes.
15. Set the desired discharge pressure.
If you change the discharge pressure, you must
change the diaphragm tank precharge pressure
Note
accordingly.
16. Check that the pumps are cutting in and out, thus adjusting
the performance to the demand.
Hydro Multi-E is now in automatic mode and ready for operation.
6. Installation, proceed as
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