Minimum Flow; Electric Data; Maximum Number Of Start-Ups Per Hour; Dimensions And Weights - HYDROO VDROO Serie Manual De Instrucciones De Instalación Y Operación

4.4. Minimum flow

Due to risk of overheating, the pump must not be used below the minimum
recommende flow rate.
Figure 7 shows the minimum flow rate as a percentage of the nominal flow rate
depending on the liquid temperature.
ATTENTION:
The pump must never operate while the downstream valve is closed.
68
Figure 7:
Minimum flow

4.5. Electric data

Check the motor specifications plate.

4.6. Maximum number of start-ups per hour

In order to prevent damages on the electric motor it should not be turned on and off
very frequently. When the pump is turned on and off frequently, the control system
must be revised and adjusted to decrease the number of ON/OFF cycles to an
acceptable level. Likewise, the installation should also be checked.
The following table shows the number of start-ups allowed per hour for motors
supplied by Hydroo.
Motor 0,37 –
4,0 – 7,5 11,0 – 15,0
power[kW] 3,0
ON/OFF cycles
60 40 30
per hour

4.7. Dimensions and weights

The pump dimensions and weights are shown in APPENDIX B.

4.8. Noise level

Noise level produced by the motors is indicated in the following table.
50Hz (2 poles)
Motor [kW] LpA [dB(A)]
0,37 – 0,55
64
(single phase)
0,75 – 1,1
64
(single phase)
1,5 – 2,2
67
(single phase)
18,5 – 30,0 –
45,0 55,0 110,0
22,0 37,0
24 16 8 4 3
LWA [dB(A)]
75
75
78
69