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Rendamax Type ∆T 22 K Pump data R301 R302 R303 R304 R305** R306** R307** Nominal flow rate Boilerresistance Grundfos pump type Pump speed Head at Qnom. Available head at Qnom. Max.* power consumption m 3 /h kPa UPS kPa kPa 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 25-80 25-80 32-80 32-80 32-120F 32-120F 32-120F 3 3 3 3 3 3 3 66 58 52 45 75 65 52 49.0 34.5 22.0 15.0 55.0 42.0 20.0 245 245 245 245 380 380 380 Table 8 Water flow rate and pump data R300 * The maximum power consumption of the pump is given for pump speed 3. The optimum operating point in relation to efficiency and minimum power consumption can be determined from the related pump curve ** 3-phase pump available as an option. The optional primary pump has been sized to have an optimum duty when∆T = 22 K. When running at ∆T’s less than this the pump size should be checked to ensure suitability. The water flow rate can be adjusted with the aid of the built-in 3-speed pump control. The water flow rate can be measured by making a ∆P measurement via the filling and drainage valve in the supply and return pipe of the unit. The measured head can be compared with the boiler resistance (table 8). At full capacity the water flow rate can be very accurately compared with the ∆T, measured across the flow and return of the boiler. 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 continue to run for several minutes. This run on time is adjustable. The standard time is two minutes. y When the system includes air heaters (ventilation, air treatment), it is usually desirable to have a small ∆T over these components. Because of this, the quantity of water flowing through the total secondary circuit is usually greater than that flowing through the boiler units. The low velocity header must be dimensioned such that the water speed does not exceed 0.5 m/s. In this case the diameter of the header must be calculated for the water volume flowing through the secondary circuit. When the water volume flowing through the secondary circuit is great er than that flowing through the primary circuit, a mixed temperature will exist which is lower than the desired temperature of the supply from the appliance. The regulation system reacts to this and opens the control devices (valves, etc.). Usually the supply temperature from the boiler(s) must be adjusted to obtain the desired temperature in the connected circuits. For additional energy savings an optional speed controlled pump is available for the R300 series. For details of this, consult your supplier. 22 Doc586/50CV22C
Rendamax 5.4.2.2 Pump characteristics Fig. 9 Pump characteristic UPS 25-80 Fig. 10 Pump characteristic UPS 32-80 Doc586/50CV22C 23
Page 1 and 2: Rendamax Technical documentation R3
Page 3 and 4: Rendamax Contents R300 Technical da
Page 5 and 6: Rendamax R300 Technical data Type R
Page 7 and 8: Rendamax Type R301 R302 R303 R304 R
Page 9 and 10: Rendamax 1.5 General restrictions T
Page 11 and 12: Rendamax 2.2 Main components 1 Cas
Page 13 and 14: Rendamax Connecting terminals [23]
Page 15 and 16: Rendamax 4 Delivery and transport 4
Page 17 and 18: Rendamax d Ensure that the correct
Page 19 and 20: Rendamax KKM option This is a boile
Page 21 and 22: Rendamax 5.3.4.2 Air supply pipe Th
Page 23 and 24: Rendamax The following table lists
Page 25: Rendamax The connection to the drai
Page 29 and 30: Rendamax 5.4.2.5 Water flow protect
Page 31 and 32: Rendamax Where: ∅ = the diameter
Page 33 and 34: Rendamax Hydraulic short-circuit In
Page 35 and 36: Rendamax P3 setpoint temperature (*
Page 37 and 38: Rendamax drainage valve. The user m
Page 39 and 40: Rendamax Adjusting the gas valve R3
Page 41 and 42: Rendamax 9 Conversion formulae and
Page 43 and 44: Rendamax Doc586/50CV22C 39
Page 45 and 46: Rendamax Technical documentation R3
Page 47 and 48: Rendamax Dimensions R300 Bypass Fig
Page 49 and 50: Rendamax 1 Description 1.1 General
Page 51 and 52: Rendamax 1.2.1 Description of princ
Page 53 and 54: Rendamax 2.2 Hydraulic system 2.2.1
Page 55 and 56: Rendamax 2.3 Examples of hydraulic

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