19
Installation
Hydraulics Circulation pumps
Pump head diagram, boiler type 75
Pump head diagram, boiler type 125 – 150
Pump head diagram, boiler type 105
Pump head diagram, boiler type 180 – 210
Boiler type
Pump type
Circulating water volume heat cell
(m
3
/h - l/min)
Residual head
(mH
2
O - mbar - kPa)
ΔT20 (K)
ΔT25 (K)
ΔT20 (K)
ΔT25 (K)
XL75F
1 x WILO PARA 8
2,8 - 46,7
2,2 - 37,4
1,5 - 150 -15
4,0 - 400 - 40
XL105F
1 x WILO PARA 9
3,8 - 64,7
3,1 - 51,7
-
2,0 - 200 - 20
XL125F
2 x WILO PARA 8
2x 2,4 - 40,6
2x 1,9 - 32,5
3,3 - 330 - 33
5,4 - 540 - 54
XL150F
2 x WILO PARA 8
2x 2,8 - 46,7
2x 2,2 - 37,4
1,5 - 150 - 15
4,0 - 400 - 40
XL180F
2 x WILO PARA 9
2x 3,8 - 64,7
2x 3,1 - 51,7
-
2,0 - 200 - 20
XL210F
2 x WILO PARA 9
2x 3,8 - 64,7
2x 3,1 - 51,7
-
2,0 - 200 - 20
For single boiler installation the connection to a low velocity header and secondary circuit pump is strongly
recommended.
For installation of cascaded boilers the connection to a low velocity header and secondary circuit pump is
mandatory.
Temp differential nominal
The WILO PARA 8 or 9 circulation pump, which is installed at the factory in the boiler, operates continuously and adapts its
pump speed to heat requirements (ΔT).
The boiler electronics continues to control the boiler’s output such that the boiler temperature setpoint is maintained.
Pump speed control controls the boiler pump’s speed in a way that the parameterized nominal temperature differential of
boiler return and boiler flow is maintained.
If the effective differential is greater than the nominal differential, the pump’s speed is increased, otherwise it is decreased.
