Bedienungsanleitung Rendamax R3400 (Seite 35 von 51) (Englisch)

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Type ∆T 20 K Pump data

Nominal

ﬂ ow

rate

Boiler-

resis-

tance

Grundfos

Pump type

Pump

speed

Head

Qnom.

Available

head at

Qnom.

Max.*

power

consump-

tion

/h kPa kPa kPa W

R3401 28.54 46 UPS 65-120F 3 77 31 1.15

R3402 31.63 53 UPS 65-120F 3 69 16 1.15

R3403 37.00 36 UPS 65-120F 3 54 18 1.15

R3404 41.84 43 UPS 80-120F 3 70 27 1.50

R3405 46.75 50 UPS 80-120F 3 62 12 1.50

R3406 51.60 58

LM 80-160/162

- 70 12 1.50

R3501 26.36 37 UPS 65-120F 3 80 43 1.15

R3502 30.83 25 UPS 65-120F 3 72 47 1.15

R3503 34.87 30 UPS 65-120F 3 60 30 1.15

R3504 38.96 35 UPS 80-120F 3 75 40 1.50

R3505 43.00 40 UPS 80-120F 3 68 28 1.50

R3601 26.36 37 UPS 65-120F 3 80 43 1.15

R3602 30.83 25 UPS 65-120F 3 72 47 1.15

R3603 34.87 30 UPS 65-120F 3 60 30 1.15

R3604 38.96 35 UPS 80-120F 3 75 40 1.50

R3605 43.00 40 UPS 80-120F 3 68 28 1.50

Table 12 Water ﬂ ow rate and pump data

* The maximum power consumption of the pump is given for pump speed 3. The optimum operating point in relation to

efﬁ ciency and minimum power consumption can be determined from the related pump curve.

The primary pump has been sized to have an optimum duty when ∆T = 20 K. When running at ∆T’s

less than 20 K the pump size should be checked to ensure suitability.

The water ﬂ ow rate can be adjusted with the aid of the built-in 3-speed pump control. The water

ﬂ ow rate can be measured by making a ∆P measurement via the ﬁ lling and drainage valve in the

supply and return pipe of the unit. The measured head can be compared with the boiler resistance

(table 12). At full capacity the water ﬂ ow rate can be very accurately compared with the ∆T, meas-

ured acros the ﬂ ow and return of the boiler.

The unit has a standard pump control. When the boiler is en abled, 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.

When the system includes air heaters (ventilation, air treat ment), it is usually desirable to have a

small ∆T over these components. Because of this, the quantity of water ﬂ owing through the total

secondary circuit is usually greater than that ﬂ owing 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 ﬂ owing through

the secondary circuit. When the water volume ﬂ owing through the secondary circuit is great er

than that ﬂ owing through the primary circuit, a mixed temper ature 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.

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