Carrier AquaSnap 61WG Series Installation, Operation And Maintenance Instructions page 50

10 - NOMINAL WATER FLOW CONTROL WITH FIXED-SPEED PUMP
To reduce the hydraulic system pressure drops, it is necessary:
- to reduce the individual pressure drops as much as possible (bends, level changes, accessories, etc.)
- to use a correctly sized piping diameter.
- to avoid hydraulic system extensions, wherever possible.
Legend
1 Unit pump curve
2 Plate heat exchanger pressure drop (to be measured with the pressure gauge installed at the water inlet and outlet)
3 Installation pressure drop with control valve wide open
4 Installation pressure drop after valve control to obtain the specified flow rate
50
Example: Unit with a given nominal flow rate of 4.8 l/s
200
175
150
125
100
75
50
25
0
2
4
4
3
1
2
6 8
Water flow rate, l/s
10