sy24inst2 - The Initiative Group

Rendamax
2.2 Hydraulic system
2.2.1 General
Although it is not the intention to provide a complete handbook covering the most divergent
hydraulic systems, the data is more extensive than would generally be provided in the case of
conventional central heating boilers.
2.2.2 Water flow
Table 6 lists the required relationship between the three parameters Q (water flow), P (pressure)
and t (temperature) at maximum capacity. Because of the high flow rate, the appliance is less
sensitive to water hardness. Therefore, the water hardness may not exceed 250 ppm with a supply
temperature of 80 °C.
2.2.2.1 Flow rate and resistance
Type Dt 22 K Pump data
R301
R302
R303
R304
R305
R306
R307
Nominal
flow rate
Boilerresistance
Grundfos
pump type
Pump
speed
Max. power
consumption
m 3 /h kPa UPS W
2.72
3.51
4.52
5.48
7.25
9.05
10.85
17.0
23.5
30.0
30.0
20.0
23.0
32.0
32-40
32-60
32-60
32-60
32-60
32-80
32-80
3
3
3
3
3
3
3
60
90
90
90
90
245
245
Table 6
Water flow rate and pump data R300
* The maximum power consumption of the pump is given for pump speed 3.
The pump has to be switched in position 3 for all unit types.
The unit has a standard pump control. When the boiler is enabled, the pump is switched on. When
the enable signal is removed, the pump will continu to run for several minutes. This run is on time
adjustable. The standard time is two seconds.
2.2.2.2 Pump characteristics
Fig. 5 Pump characteristic UPS 32-40
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