techem Classic S3, Operating Instructions Manual

Page: 10 / 144

10
Device structure / Technical data
• Installation: sufficient spacing (250 mm) between the computer unit and possible sour-
ces of electromagnetic interference • Do not connect to the building’s earthing • Select
a good, dry, easily accessible place • Energy-saving mode (display off)
• Individual remote reading with optional plug & play modules (M-bus, pulse)
Installation
General installation instructions
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Observe the environmental conditions!
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Note the cable lengths: Volume measuring section: max. 10 m (use shielded cable),
temperature sensor: max. 10 m.
Securing the computer unit on the wall
Install the computer unit on the wall with the enclosed mounting material.
Installing the temperature sensors
!
Temperature sensors must only be installed as they have been delivered. The
cables may neither be shortened nor extended.
• The temperature sensor type (Pt 500) must agree with the specifications on the name
plate of the computer unit.
• Do not lay the temperature sensor cable near cable ducts or channels (min. 300mm).
• The temperature sensors can be installed in special ball valves or immersion pockets
which are authorised for this type of sensor. – Observe the national regulations.
Be careful to install the temperature sensors symmetrically. Preferably directly immer-
sed.
Directly immersed installation
1 Remove the pressure from the sensor installation location
2
Unscrew the closing screw from the special ball valve.
3 Place the enclosed O-Ring on the assembly pin. Only use one O-Ring.
When replacing sensors, replace the old O-Ring with a new one.
4 Using the assembly pin, turn the O-Ring into the bore hole of the screw plug with a
rotating movement.
5 Place the O-Ring in its final position using the other end of the assembly pin.
6 Place the assembly pin with the sleeve end over the temperature sensor as far as it
will go.
7
Position and attach the attachment screw (plastic nut or brass union piece) on the
temperature sensor.
8
Remove the assembly pin from the temperature sensor.
9 Insert the temperature sensor into the ball valve and tighten the union joint hand-
tight
.
Installation in immersion pockets
• Sensor immersion pockets are best installed in T-pieces with 45° or 90° angles. In
the process, the tip of the immersion pockets points against the flow direction and is
located in the middle of the flow.
• Can only be used in combination with approved immersion pockets !
• Insert the temperature sensor into the immersion pockets as far as it goes