Brochure

Product range
MAGNA3
3
7
3. Product range
Pump selection
Frequently, pumps are selected based on a maximum
flow and pressure loss in a system as well as peak
efficiency of the pump. For circulators in variable
demand systems such as a heating system where the
heat load varies with the season and time of day it is
more optimal to select a pump for this varying demand
rather than one specific duty point.
The MAGNA3 has been optimized for variable demand
systems. For variable loads, when possible it is most
ideal to size and select the pump such that the
maximum flow and pressure required is on the right
hand side of the pump performance curve.
This enables the pump to have higher efficiency at
partial load and allows the pumps to slow down more
at these partial loads yielding significant energy
savings.
Pump size
The system characteristic is used together with the
pump’s performance curve for sizing and correct pump
selection.
The selection of pump size should be based on the
following:
• required maximum flow
• maximum pressure loss in the system.
Refer to the system characteristics to determine the
duty point. See fig. 5.
Fig. 5 System characteristic
Operating conditions
When selecting a pump, always verify the operating
conditions are fulfilled. Refer to section Guide to
performance curves on page 40 for:
• liquid quality and temperature
• ambient conditions
• minimum inlet pressure
• maximum operating pressure.
Single-head pump
Cast iron Stainless steel (N)
Page reference
115 V 208-230 V 115 V 208-230 V
MAGNA3 32-60 F (N) 98126820 98126822 42
MAGNA3 32-100 F (N) 98126824 98126826 43
MAGNA3 40-80 F (N) 98126800 98126828 98126802 98126830 44
MAGNA3 40-120 F (N) 98126804 98126832 98126806 98126834 45
MAGNA3 40-180 F (N) 98126808 98126836 98126810 98126838 46
MAGNA3 50-80 F (N) 98126812 98126840 98126814 98126842 47
MAGNA3 50-150 F (N) 98126816 98126844 98126818 98126846 48
MAGNA3 65-120 F (N) 98124696 98126848 98124702 98126850 49
MAGNA3 65-150 F (N) - 98126852 - 98126854 50
MAGNA3 80-100 F (N) - 98126856 - 98126858 52
MAGNA3 100-120 F (N) - 98126860 - 98126862 54
MAGNA3 D 65-150 F - 98126863 - - 51
MAGNA3 D 80-100 F - 98126864 - - 53
MAGNA3 D 100-120 F - 98126865 - - 55
TM02 2040 3301
Q
Duty point
H