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Elco R600 IP-ZW Manual

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9
Bypass water heater
When a higher temperature increase than 17K should be achieved directly within one step,
this can be done by using a water heater with internal bypass. The built-in bypass pump
secures a minimum flow rate through the water heater.
When using a water heater with bypass, the internal pump will not transport the hot water
from the water heater to the system. Therefore a system pump should be selected, based on
the desired ∆T. Below you’ll find a schematic drawing of the situation, plus two tables with all
the necessary information for the selection of the system pump. Please be aware that for the
calculation method an additional resistance of 10 kPa for the system piping is included.
Bypass pump data
R601 R602 R603 R604 R605 R606 R607
Pump type [-] UPS
32-80B
UPS
32-80B
UPS
32-80B
UPS
32-80B
UPS
32-120FB
UPS
40-120FB
UPS
50-120FB
Voltage [V] 230 230 230 230 230 230 400
∆T = 40K Curve setting [-] 2 2 3 3 1 1 1
∆T = 50K 2 3 3 3 2 2 2
∆T = 55K 2 3 3 3 2 2 2
∆T = 60K 2 3 3 3 3 2 2
∆T = 70K 2 3 3 3 3 3 2
∆T = 80K 2 3 3 3 3 3 2
System pump design data
R601 R602 R603 R604 R605 R606 R607
∆T = 40K Flow rate [m3/h] 3.1 4.1 5.1 6.1 8.2 10.2 11.6
Required pump head [kPa] 35.5 28.9 57.3 50.7 42.3 49.0 60.6
∆T = 50K Flow rate [m3/h] 2.4 3.2 4.1 4.9 6.5 8.2 9.2
Required pump head [kPa] 30.3 58.5 50.8 44.4 40.8 56.3 64.6
∆T = 55K Flow rate [m3/h] 2.2 2.9 3.7 4.4 5.9 7.4 8.4
Required pump head [kPa] 27.3 56.4 48.7 41.4 34.7 53.0 61.4
∆T = 60K Flow rate [m3/h] 2.0 2.7 3.4 4.1 5.4 6.8 7.7
Required pump head [kPa] 26.2 55.4 46.6 39.3 58.6 47.9 69.1
∆T = 70K Flow rate [m3/h] 1.7 2.3 2.9 3.5 4.7 5.8 6.6
Required pump head [kPa] 24.2 52.3 44.4 35.2 51.4 61.6 66.8
∆T = 80K Flow rate [m3/h] 1.5 2.0 2.6 3.1 4.1 5.1 5.8
Required pump head [kPa] 22.1 50.2 40.3 30.2 45.3 53.5 65.6
R1
R2
P1
P2
Q1
Q2
Q1+Q2
P1 = bypass pump
P2 = system pump
… 9 …


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