Setting of FLU is by means of relative screw; fully tighten the screw to obtain
minimum flow rate setting, fully loosen the screw to have maximum flow rate
setting. The following table gives the values for limiting flow rate settings in m
3
/h
in relation to the pipe diameter. The FLU flow switch is supplied with the setting
screw fully tightened (minimum setting).
For applications in heating systems subject to I.S.P.E.S.L. approval in accordance
with the requirements of Body R, where a safety action is requested (switching off
of the motor-driven pump under an abnormal condition), it is advisable to leave
the setting at minimum, bearing in mind that the device acts on the burner when
the flow rate drops below the value given in the bold-face column.
FLU
Flow switch for liquids, for
piping from 1" to 8".
0401125 1”
IP64
0401126 1”
IP67
Part No. Size Protection
FLU is a flow switch which interrupts the electric control
circuit of the burner when there is insufficient water
circulation in the boiler circuit owing to some abnormal
condition (e.g. stopping of the motor -driven pump).
The FLU flow switch is operated thanks to an electrical
blade-type tripping device (stainless steel blade) and can
be installed on pipework from 1" to 8" in size.
APPLICATION AND OPERATION
Mount so that the direction indicated by the arrow
coincides with the flow.
For correct operation it is advisable:
- to mount on the return pipe
- to mount on horizontal pipe (mounting on vertical piping
is possible after appropriate setting)
- to keep a certain distance from sources of turbulence
(elbows, valves, etc.); recommended min. distance is
equal to 5 times the pipe diameter
- to keep a minimum distance of 55 mm between the
pipework and the lower base of the appliance.
INSTALLATION
The 1-2 contact is normally open (closes when the flow
rate setting is reached); contact 1-3 is normally closed
(opens when the flow rate setting is reached). Earth con-
nection is through relative screw located at the bottom on
the microswitch support.
ELECTRICAL CONNECTIONS
Conformity with Body R of I.S.P.E.S.L. regulations
CE mark in conformity with European Directives EEC
89/336, EEC 73/23.
APPROVALS
ADJUSTMENT OF FLOW RATE SETTING
1”
34
0,9
0,4
2,0
1,5
1”
1/4
34
1,2
0,6
2,6
1,9
1”
1/2
57
1,6
0,9
3,3
2,6
2”
57
3,2
2,3
7,1
5,1
2”
1/2
88
4,2
3,5
8,0
7,0
3”
88
6,3
5,7
12,0
10,5
4”
88
13,5
12,0
28,0
26,0
4”
167
8,0
7,1
20,0
18,0
5”
88
27,0
23,0
60,0
58,0
5”
167
12,1
9,0
30,0,
28,0
6”
88
43,0
36,0
91,0
37,0
6”
167
17,2
12,0
35,0
32,0
8”
88
85,0
73,0
176,0
170,0
8”
167
42,0
36,0
90,0
85,0
Overall dimensions (mm)
DESIGN FEATURES
Casing and cover
Die-cast aluminium
Bellows
Phosphor bronze
Blade
Stainless steel (*)
Fitting
Brass, 1" M
(*) Blade length varies according to the pipe diameter (see table)
TECHNICAL CHARACTERISTICS
Contact load rating
6 (2) A at 250 V ~ at 50 Hz
Max. fluid pressure
10 bar
Max. fluid temperature
110°C
Max. room temperature
60°C
Degree of protection
IP 64 for Art. 0401125
IP67 for Art. 0401126
(*) also available in the version with microswitch 20 (8) A at 250 V ~.
NORMALLY
OPEN
NORMALLY
CLOSED
Pipe
Blade
Flow rate with Flow rate with
diameter
length
minimum setting maximum setting
(screw fully tightened) (screw fully loosened)
inches
mm
m
3
/h
m
3
/h
close open close open
