Installation instructions S-HR series page 12
5
External calorifiers
Various external calorifiers can be connected to a S-HR
unit, depending on the comfort requirements. The
wiring of the calorifier thermostat can be connected to
the connection block in the Control Tower by means of
the relevant plug.
Calorifiers which are used together with the S-HR boiler
should be of the quick recovery type.
S-HR51 and S-HR60
Consult STREBEL when using calorifiers
with lower absorption than 20kW or primary
pipe and/or coil size less than 3/4 inch.
S-HR with calorifier
figure 14
6
Electrical connection
The unit complies with the CE machine guidelines 89/
392/EEC.
The installation must be in accordance with:
- Current I.E.E. Regulations;
- Local Regulations;
- A visible electrical isolation switch must be fitted
adjacent to the boiler complete with an earth.
The apparatus complies with the following regulations:
- low-voltage guideline 73/23/EEC
- EMC guideline 89/336/EEC
Furthermore the following general regulations are valid:
- no modifications may be made to the wiring of the
unit;
- all connections must be made to the connection
block.
The Brain room thermostat and controls must be
connected to their allocated connections. All other types
or makes of room thermostats or controls which are
used must have a potential-free contact
When using an on/off thermostat or control, it is possible
that an anticipating resistance must be installed in order
to prevent too high temperature fluctuations. As a stand-
ard rule this means mercury thermostats. This resis-
tance wire is present in the Control Tower and must be
connected to clamps 23 and 27. The anticipating resis-
tance in the room thermostat has to be set at 0.11 A.
For more detailed questions regarding the components
which are not supplied by STREBEL, the supplier
concerned should be contacted.
The connections of the Brain Interface and
the wiring of the three-way valve with the
calorifier sensor are only applicable if they
are installed in the Control Tower.
230 Volts for external pump
mains power supply
230 Volts for external control
230 Volts
internal or external three-way valve motor and calorifier sensor
Brain clock thermostat
On/off
thermostat
or
control
Connection block in the Control Tower
STREBEL outside sensor
External
safety
contact
24 Volts maximum 100 mA
