Installing The Temperature Sensors; Fitting The Thermal Insulation; 5.4.1 Fitting The 80 Mm Thermal Insulation; 5.4.2 Fitting The 120 Mm Thermal Insulation - Bosch BST 500/80 Sr Installations- Und Wartungsanleitung

30 | Installation
DANGER: Risk of fire through soldering and
welding!
B As far as possible, carry out any soldering
and welding work before fitting the
thermal insulation.
B Take appropriate protective measures
when soldering and welding as the
thermal insulation is flammable (for
example cover the thermal insulation).
B Check thermal insulation after
completion for perfect condition.
NOTE: Risk of material damage from leaking
connections and exceeding the maximum
values.
B Fit all connection lines free of mechanical
strain.
B In order not to damage the buffer
cylinder, maintain the maximum values
( Table 31, page 28 and Table 33,
page 28).
To prevent subsequent damage to the buffer cylinder:
Use installation material that is heat-resistant to
B
110 °C.
B For solar connections, use installation materials that
are heat-resistant up to 135 °C.
B Use only threaded fittings, with shut-off valves if
required, to connect lines to the cylinder.
Install a drain valve on site at the lowest point of the
B
lower connection.
Checking for leaks
Fig. 10, page 54.
5.3

Installing the temperature sensors

Fig. 9, page 53:
B Apply heat conducting paste to the contact surfaces.
B Insert the temperature sensor into the spring clip so
that the full length of its contact surface is flush with
the cylinder vessel.
Ensure that the full length of the sensor
surface is in contact with the cylinder
vessel.
B Mark the temperature sensor leads at the end of each
lead.
Route the sensor lead carefully to the control unit,
B
ensuring it will be possible to fit the insulation.
6 720 800 379 (2011/03)
5.4

Fitting the thermal insulation

The thermal insulation is best fitted at
temperatures around 15 °C. Lightly tapping
the thermal insulation towards the two ends
makes it easier to bring the ends together.
BST
If you are using an immersion heater, the
thermal insulation for the immersion heater
connection and the cover are not required.

5.4.1 Fitting the 80 mm thermal insulation

Fig. 11, page 54.

5.4.2 Fitting the 120 mm thermal insulation

We recommend completing the installation
and tightness test before fitting the thermal
insulation.
Fig. 12, page 54.
5.5

Fitting the sensor well (optional)

BST
The female connection for fitting a sensor
well on site is located on the rear of the
buffer cylinder. Here, a sensor well can be
fitted to contain the temperature sensor
( Fig. 9, page 53).
To measure and monitor the water temperature in the
B
buffer cylinder, fit the temperature sensor to the test
point.
Guide the temperature sensor with the spring clip
B
into the sensor well.
5.6

Electrical connection

DANGER: Risk to life through electric
shock!
B Ensure that any electrical work is only
carried out by an approved electrician.
B Before opening the control unit, isolate
the heating system from the mains power
supply.
B Secure the heating system against
unintentional reconnection.
B Route the sensor leads to the control unit.
Make the electrical connections of the sensor leads –
B
observe the control unit installation instructions.