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DemystifyingSelfSensing Pumps
Design Operating Point300 Gallons Per Minute53 Feet of Head
System Curves
150 ton system @ 12deg Delta T
60 GPM each fan coil
3-Way Control Valve
0 100 200 300 400 500 6000
20
40
60
80
100
120
140
System Curve
Flow (Q) in GPM
Hea
d (
H)
in F
eet
System
Capacity (Q) in GPM
Head (H) in Feet
0.00 0100.00 7200.00 25300.00 53400.00 90500.00 136
Design Operating Point
=
System Curves
System Curves3-Way Control Valve
Pump Curves
Pump Curves
Taco Test Lab
Pump Curves
Input Electrical Power
9.25" Diameter 8.00" Diameter 6.75" Diameter
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
0.00 84.46 -0.05 4.25 0.00 59.55 -0.16 2.86 0.00 39.24 -0.10 1.75
54.17 84.57 25.83 4.48 45.83 59.76 24.24 2.88 37.50 39.31 20.80 1.79108.33 84.75 44.23 5.24 100.00 59.74 44.25 3.40 75.00 39.14 37.46 1.98189.58 84.13 62.21 6.47 160.42 59.05 58.87 4.06 131.25 38.31 55.31 2.30216.67 83.51 66.36 6.88 200.00 58.00 65.04 4.50 150.00 37.84 59.56 2.41270.83 81.45 72.60 7.67 252.08 55.80 70.45 5.04 206.25 35.64 67.94 2.73325.00 78.17 76.49 8.39 300.00 52.76 73.03 5.47 225.00 34.60 69.40 2.83433.33 67.71 77.92 9.51 343.75 49.07 73.63 5.78 281.25 30.36 70.07 3.08406.25 70.82 78.38 9.27 400.00 42.84 71.44 6.05 300.00 28.54 69.01 3.13487.50 60.54 75.20 9.91 458.33 34.60 64.85 6.18 375.00 19.10 56.70 3.19541.67 52.15 69.85 10.21 500.00 27.43 56.08 6.17 412.50 13.14 43.96 3.11650.00 32.11 50.10 10.52 550.00 17.43 39.85 6.07 450.00 6.49 24.71 2.99
KS Model 4009 Test Data at 1760 RPMPump Curves
9.25" Diameter 8.00" Diameter 6.75" Diameter
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
0.00 84.46 -0.05 4.25 0.00 59.55 -0.16 2.86 0.00 39.24 -0.10 1.75
54.17 84.57 25.83 4.48 45.83 59.76 24.24 2.85 37.50 39.31 20.80 1.79108.33 84.75 44.23 5.24 100.00 59.74 44.25 3.40 75.00 39.14 37.46 1.98189.58 84.13 62.21 6.47 160.42 59.05 58.87 4.06 131.25 38.31 55.31 2.30216.67 83.51 66.36 6.88 200.00 58.00 65.04 4.50 150.00 37.84 59.56 2.41270.83 81.45 72.60 7.67 252.08 55.80 70.45 5.04 206.25 35.64 67.94 2.73325.00 78.17 76.49 8.39 300.00 52.76 73.03 5.47 225.00 34.60 69.40 2.83433.33 67.71 77.92 9.51 343.75 49.07 73.63 5.78 281.25 30.36 70.07 3.08406.25 70.82 78.38 9.27 400.00 42.84 71.44 6.05 300.00 28.54 69.01 3.13487.50 60.54 75.20 9.91 458.33 34.60 64.85 6.18 375.00 19.10 56.70 3.19541.67 52.15 69.85 10.21 500.00 27.43 56.08 6.17 412.50 13.14 43.96 3.11650.00 32.11 50.10 10.52 550.00 17.43 39.85 6.07 450.00 6.49 24.71 2.99
KS Model 4009 Test Data at 1760 RPMPump Curves
8.00" Diameter
Capacity (GPM) Head (Ft) Efficiency (%) BHP (HP)
0.00 59.55 -0.16 2.86
100.00 59.74 44.25 3.40
200.00 58.00 65.04 4.50
300.00 52.76 73.03 5.47
400.00 42.84 71.44 6.05
500.00 27.43 56.08 6.17
Pump Curves
KS Model 4009 Test Data at 1760 RPM
8.00" Diameter
Capacity (GPM)
Head (Ft)
Efficiency (%)
BHP (HP)
0.00 59.55 -0.16 2.86100.00 59.74 44.25 3.40200.00 58.00 65.04 4.50300.00 52.76 73.03 5.47400.00 42.84 71.44 6.05500.00 27.43 56.08 6.17
KS Model 4009
Test Data at 1760 RPM
0 100 200 300 400 5000
10
20
30
40
50
60
70Pump Curve
Flow (Q) in GPM
He
ad
(H
) in
Fe
et
Pump Curves
Pump System
Capacity (GPM)
Head (Ft)Efficiency
(%)BHP (HP)
Head (Ft)
0.00 59.55 -0.16 2.86 0100.00 59.74 44.25 3.40 6.91200.00 58.00 65.04 4.50 24.91300.00 52.76 73.03 5.47 52.76400.00 42.84 71.44 6.05 89.83500.00 27.43 56.08 6.17 135.74
KS Model 4009
With an 8.00” impeller
Test Data at 1760 RPM
Pump Curves
SelfSensing Pumps
SelfSensing Pumps vs. Sensors
Correct Sensor Location
Resulting System Performance
Shaded area represents energy savings compared to constant speed pumps
( VFD. SET AT 60. HZ.)
GPMFM\FLOW FT\HEAD H.P.
0.000 56.833 2.6674.055 56.600 3.19144.206 56.516 3.94220.416 55.522 4.80286.850 53.348 5.46360.737 49.545 6.10
( VFD. SET AT 40. HZ.)
GPMFM\FLOW FT\HEAD H.P.
0.000 25.090 0.8548.511 24.959 0.9996.347 24.887 1.23
143.507 24.500 1.47193.075 23.391 1.68240.515 21.753 1.86
( VFD . SET AT 20. HZ)
GPMFM\FLOW FT\HEAD H.P.
0.000 5.962 0.1625.477 5.934 0.1848.194 5.921 0.2171.406 5.872 0.2496.522 5.624 0.27119.514 5.245 0.29
SelfSensing PumpsKS Model 4007
With 7.5 horsepower motor and VFD
With a 7.50” diameter impeller
Test data displayed below
Each pump goes through a complete data collection process
The data points are plotted to create pump curves at various speeds
SelfSensing Pumps
The SelfSensing pump operates anywhere in the dark grey area of the graph
SelfSensing Pumps
SelfSensing Pumps
3-Way Valve
Variable Flow
Constant Flow
0 50 100 150 200 250 300 350 400 4500
10
20
30
40
50
60
70
80
90
100
Flow (GPM)
Hea
d (
Ft.
)
SelfSensing Pumps
Valves Open Maximum Flow
Valves Closed Minimum Flow
0 50 100 150 200 250 300 350 400 4500
10
20
30
40
50
60
70
80
90
100
Flow (GPM)
Hea
d (
Ft.
)
Valves Open Maximum Flow
Valves Closed Minimum Flow
60 Hz50 Hz40 Hz30 Hz20 Hz
SelfSensing Pumps
0 50 100 150 200 250 300 350 400 4500
10
20
30
40
50
60
70
80
90
100
Flow (GPM)
Hea
d (
Ft.
)
SelfSensing Pumps
60 Hz
20 Hz
Valves Open Maximum Flow
Valves Closed Minimum Flow
Control Curve
SelfSensing Pumps
During increasing demand, the pump rides to the right (down) on the pump curve.
The SelfSensing pump automatically responds and keeps the pump on the control curve. (follow A to B and so on)
SelfSensing Pumps
During decreasing demand, the pump rides to the left (up) on the pump curve.
The SelfSensing pump automatically responds and keeps the pump on the control curve. (follow I to J and so on)
0 50 100 150 200 250 300 350 400 4500
10
20
30
40
50
60
70
80
90
100
Flow (GPM)
Hea
d (
Ft.
)
Valves Open Maximum Flow
Valves Closed Minimum Flow
Constant Flow
SelfSensing Pumps
60 Hz
20 Hz
0 50 100 150 200 250 300 350 400 4500
10
20
30
40
50
60
70
80
90
100
Flow (GPM)
Hea
d (
Ft.
)
SelfSensing Pumps
60 Hz
20 Hz
Valves Open Maximum Flow
Valves Closed Minimum Flow
Constant Pressure
SelfSensing Pumps
When you use the pump selection wizard, the software generates a control curve that is unique to your system configuration.
If you do not specify a control head, at time of order, Taco uses 40% of the design operating point.
You can adjust the control head on the selection wizard and specify the desired value on your order
Control Head
Control Head Adjustment
SelfSensing vs. Sensors
SelfSensing Pumps vs. Sensors
• Sensors are frequently placed in the wrong location in the system; this incorrect sensor placement results in system inefficiency.
• In a typical system, trial and error must be used (i.e. physically moving the sensor) until the optimum location is determined.
• Another strategy is to use multiple sensors to increase the odds of correct placement.
• These strategies can become costly.
• Even if correct placement is achieved, correct setpoint is rarely used.
SelfSensing Pumps vs. Sensors
Incorrect Sensor Location
Resulting System Performance
Shaded area represents energy savings compared to constant speed pumps
SelfSensing Pumps vs. Sensors
Correct Sensor Location
Resulting System Performance
Shaded area represents energy savings compared to constant speed pumps
SelfSensing Pumps vs. Sensors
The SelfSensing pump has an advantage over sensors because you no longer have to worry about the sensor location. The SelfSensing pump automatically operates on the control curve shown.
You can quickly adjust the control head on a SelfSensing pump in the field. Adjusting the control head is akin to moving the sensor to a new more optimal location in the building. This optimization strategy is now significantly quicker and cheaper when using a SelfSensing pump.
0 50 100 150 200 250 300 350 400 4500
10
20
30
40
50
60
70
80
90
100
Flow (GPM)
He
ad
(F
t.)
Design Operating Point
Control Curve
Control Head
If you are having trouble deciding whether to use a SelfSensing pump or a sensor, just ask :How often does the construction team know in advance what the optimum location will be?How often does the construction team place the sensor in the perfect location?
SelfSensing Pumps vs. Sensors
