Selection Of Circulation Pumps - Wolf MGK-2-390 Installation Instructions Manual

Wilo
Nominal flow
rate at 20 K
Spread [m /h]
3
MGK-2
17.2
390
MGK-2
20.2
470
MGK-2
23.7
550
MGK-2
26.7
630
Grundfos
Nominal flow
rate at 20 K
Spread [m /h]
3
MGK-2
17.2
390
MGK-2
20.2
470
MGK-2
23.7
550
MGK-2
26.7
630
3063772_201507

12. Selection of circulation pumps

The MGK-2 is supplied without a circulation pump. The pump rate of the pump to be
supplied by the customer must be determined depending on the system and boiler
pressure drop. The fan's power supply and speed control are via the MGK-2 (see
electrical connection).
The primary and secondary circuit pumps should generally have the same flow rate.
The pumps shown below are designed for a spread of 20 K. If the spread on the
secondary side is smaller, a larger pump must be selected on the primary side. The
maximum flow rates under 4. Specification must be observed.
The following pumps are recommended for the assembly of an MGK-2 with low loss
header.
HE pressure drop
at 20 K Wilo type
Spread [mbar]
120 Stratos 50/1-2
113 Stratos 50/1-12
126 Stratos 65/1-12
118 Stratos 65/1-12
HE pressure drop
Grundfos
at 20 K
Type
Spread [mbar]
Magna3
120
50-120F
Magna3
113
50-120F
Magna3
126
50-150F
Magna3
118
50-180F
• The maximum power consumption of the circulation pump must not exceed 4 A.
• Reductions from DN80/PN6 to DN/50 or DN65/PN6 are required for the
hydraulic connection of the pumps.
• For the speed control of the circulation pump via the 0-10 V or PWM output of
the boiler control unit, an extension module may be required from the pump
manufacturer.
Delivery
Residual Output
head
head [mbar]
[mbar]
770 650
680 567
730 604
655 537
Delivery
Residual Output
head
head [mbar]
[mbar]
730 610
640 527
650 524
680 562
Current
Connection
[W] [A]
1~230V
590 2.6
DN 50 flange fitting
1~230V
590 2.6
DN 50 flange fitting
1~230V
800 3.5
DN 65 flange fitting
1~230V
800 3.5
DN 65 flange fitting
Current
Connection
[W] [A]
1~230V
540 2.4
DN 50 flange fitting
1~230V
540 2.4
DN 50 flange fitting
1~230V
630 2.8
DN 50 flange fitting
1~230V
760 3.4
DN 50 flange fitting
19