Circulation Pump Sizing - Riello TAU Unit 50 Installation And Maintenance Manual

GENERAL INFORMATION
DESCRIPTION
Maximum working pressure
Minimum supply pressure
Maximum permitted temperature
Lockout thermostat activation temperature
Adjustment temperature (min / max)
Thermal module water content
Maximum condensation at 100% rated heat output (40-30°C)
Power supply
Index of protection
Consumption at full load
Consumption at part load
Electrical consumption in standby mode
1.8

Circulation pump sizing

This TAU Unit boiler comes without a pump. A pump must therefore be provided as part of the installation.
In order to choose a pump of the right size, bear in mind the boiler's water-side pressure drop, as shown in the figure below.
Water-side pressure drop
Pressure drop (mbar)
350
300
250
200
150
100
50
0
0 2
75
50
25
0
0 1
9
At the first start-up, and at least once a year, the rotation
of the circulator shaft should be checked as, especially after
long periods of not being operated, deposits and/or residu-
als could impede its free rotation.
Elmax
Elmin
4 6 8
2 3
TAU Unit
50
91
8
100
40
Psb
TAU Unit 50
TAU Unit 70
10 12 14
TAU Unit 70
4 5
9
Before loosening or removing the circulator cap, protect the
electric devices located underneath from any water that ex-
its.
0
It is prohibited to operate the circulators without water.
10
TAU Unit TAU Unit TAU Unit
70 100 115
5
1
110
110
30/80
99 130 130
11 14 15
230-50
X0D
150 230 230
50 60 60
18
TAU Unit 100
TAU Unit 115
16 18 20
TAU Unit 50
TAU Unit 100
TAU Unit 115
6 7
Flow-rate (m
bar
bar
°C
°C
°C
I
l/h
V-Hz
IP
W
W
W
22
8
3 /h)