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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.
12. Selection of circulation pumps
Wilo
Nominal flow
rate at 20 K
Spread [m
3
/h]
HE pressure drop
at 20 K
Spread [mbar]
Wilo type
Delivery
head
[mbar]
Residual
head [mbar]
Output
[W]
Current
[A]
Connection
MGK-2
390
17.2
120
Stratos 50/1-2
770
650
590
2.6
1~230V
DN 50 flange fitting
MGK-2
470
20.2
113
Stratos 50/1-12
680
567
590
2.6
1~230V
DN 50 flange fitting
MGK-2
550
23.7
126
Stratos 65/1-12
730
604
800
3.5
1~230V
DN 65 flange fitting
MGK-2
630
26.7
118
Stratos 65/1-12
655
537
800
3.5
1~230V
DN 65 flange fitting
Grundfos
Nominal flow
rate at 20 K
Spread [m
3
/h]
HE pressure drop
at 20 K
Spread [mbar]
Grundfos
Type
Delivery
head
[mbar]
Residual
head [mbar]
Output
[W]
Current
[A]
Connection
MGK-2
390
17.2
120
Magna3
50-120F
730
610
540
2.4
1~230V
DN 50 flange fitting
MGK-2
470
20.2
113
Magna3
50-120F
640
527
540
2.4
1~230V
DN 50 flange fitting
MGK-2
550
23.7
126
Magna3
50-150F
650
524
630
2.8
1~230V
DN 50 flange fitting
MGK-2
630
26.7
118
Magna3
50-180F
680
562
760
3.4
1~230V
DN 50 flange fitting
•
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.
