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Rendama
x
40 Doc890/3456CV02B
Type Pump
speed
Pmax
W
Pmin
W
I
A
3x400 V
cos
φ
UPS 65-120F
R3401 - R3403
R3501 - R3503
R3601 - R3603
1
2
3
850
900
1150
440
460
600
1.35
1.45
2.15
0.91
0.90
0.77
UPS 80-120F
R3404 - R3405
R3504 - R3505
R3604 - R3605
1
2
3
1000
1100
1500
710
760
960
1.65
1.80
2.75
0.87
0.88
0.79
LM 80-160/162
R3406 - 1500 - 4.05 0.79-0.70
Table 13 Electrical data for pumps
5.4.2.3 Isolating valves
It is recommended that manual valves be fi tted between the fl ow and return connections and the
installation.
5.4.2.4 Valves
For R3400/R3500/R3600 units connected in cascade, a de layed motorised shut-off valve can be
used if it is controlled by the boiler using terminals 14 + 15 or alternatively, a mechanical non-re-
turn valve can be used. This is required so as to avoid short-circuiting the appliance on the water
side.
5.4.2.5 Water fl ow protection
The unit is provided with water fl ow protection. This shuts the appliance down in the event that
the fl ow of water through the appliance falls below the minimum required value. This protec tion is
implemented by means of a water fl ow switch.
5.4.3 Water pressure
5.4.3.1 Operating pressure
y
At a maximum supply temperature of 90°C and a minimum water fl ow rate such as occurs at a ∆T
of 20 K, the minimum operating pressure must be greater than 1.5 bar. The operating pressure
must be measured with the pump switched off. If a lower pressure is desired, the maximum sup-
ply temperature must be adjusted accordingly.
Minimum operating
pressure in bar
Flow temperature
°C
T
K
›1.5
›1
90
80
20
20
Table 14 minimum operating pressures
5.4.3.2 Boiler expansion tank
It is advisable to t an expansion tank in the return pipe be tween pump and the boiler isolating
valve.
5.4.3.3 System expansion tank
The size of the expansion tank is determined by the quantity of water in the system. Our advice is
to fi t the system expansion tank at the neutral point (centrally) of the low velocity header.
5.4.3.4 Water pressure protection
All appliances are fi tted with a safety valve that opens at 3 bar. As an option, safety valves can be
supplied with settings be tween 3 and 6 bar with increments of 1 bar.
37


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