Selecting A Circulator Pump - Viega Climate Trak Installation Manual

System Design

3.6 Selecting a Circulator Pump

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The pump must have a capacity equal to the system flow rate and a head
equal to the system pressure loss. These two system characteristics are
the primary ones in selecting a pump. Flow rates come from the Radiant
Wizard program.
Pressure drop comes from the previous page or from the Radiant
Wizard program. Remember that for pressure drop, use the highest
pressure drop of all the circuits fed by their circulator. If the circulator can
overcome that pressure drop, then it can overcome all the others.
Procedure:
1. Locate the pressure drop on the left vertical axis.
2. Locate the total system flow rate on the bottom horizontal axis.
3. Follow to the intersection of both variables.
4. Select the pump with a curve higher than this point.
Example:
Total GPM through ½" Viega Barrier PEX: 5 GPM
Longest circuit pressure drop: 10 ft. of head
Pump selected: Low Head Pump
Stock Code Speed
HI
12126 MED
LOW
Amps Watts
0.75 87
0.66 80
0.55 60
IM-HC 530590 0621 Climate Trak (EN)
HP
/
1
25
/
1
25
/
1
25