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Basics of Pump Application for HVAC Systems
Basics of Pump Application for HVAC Systems 305
80
70
One pump,
100% capacity,
constant speed
60
50
Two pumps,
50% capacity,
kW Input 40
variable speed
One pump
30 50% capacity,
variable speed
One pump
100% capacity,
variable speed
20
10
0
0 500 1000 1500 2000 2500 3000
System flow—GPM
Figure 10.16 kW input for Tables 10.8, 10.9, and 10.10.
10.10.1 Total kW input indication and
pump programming
Total kW input indication for an actual pumping system can be dis-
played easily on the pumping system controller. The operator can
observe the kW input before a pump is added or subtracted.
kW input is an excellent procedure for programming variable-speed
pumps in a multiple-pump installation. Rather than waiting for a system
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