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Rendamax R3400 Manual

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38 Doc890/3456CV02B
Type ∆T 20 K Pump data
Nominal
fl ow
rate
Boiler-
resis-
tance
Grundfos
Pump type
Pump
speed
Head
at
Qnom.
Available
head at
Qnom.
Max.*
power
consump-
tion
m
3
/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.
y
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.
… 35 …


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