4 x Set-up and installation
FA ROTEX HPSU compact (V5) •
33
Connection variant 3 4.5.14 Connection of an external heat generator
For heating support or as an alternative to an electrical Backup
Heater (see section 4.5.13) you can connect an external heat
generator (e.g. gas or oil boiler) to the ROTEX HPSU compact.
The heat supplied by the external
heat generator must be added
to the unpressurised storage tank water in the ROTEX HPSU
compact hot water storage tank.
Ɣ Carry out hydraulic connection in accordance with one of the
two following possibilities:
a)
unpressurised via connections (solar infeed and
solar return) of the hot water tank
or
b)
on device types ROTEX HPSU compact …Biv, via
the integrated pressurised solar heat exchanger.
– Observe the instructions concern
ing hydraulic connections
(see chapter 2.4)
– Examples of hydraulic connection (see chapter 9).
Demand from an external heat generator is switched to the RTX-
EHS
circuit board via a relay (see fig. 4-37). The electrical con-
nection to the ROTEX HPSU compact is possible as follows;
a) External heat generator has a potential-free switch
contact connection for heat demand:
– Connection to K3, if the external heat generator takes
over the hot water generation and heating support (setting
parameter [Function Heating]=2)
or
– Connection to K1 and K3 if two external heat generators
a
re being used (setting parameter [Function Heating]=3).
Here K1 switches the external heat generator (e.g. gas or
oil boiler) for heating support and K3 the external heat
generator (BUxx) for hot water generation.
or
– Connection on AUX connection A (see section 4.5.18)
b)
External heat generator can only be switched via the
mains power supply:
Connection (~230 V, maximum load 3000 W) at K1 and
K3.
Ɣ Suitab
le electrical connection from the relevant installation
instructions for the external heat generation.
Ɣ Con
nect external heat generation to the ROTEX HPSU
compact (fig. 4-37).
Connection X1 is a screw terminal.
Isolated 6.3 x 0.8 mm push-on receptacles are required for
con
nections X2_1/2/3.
When connecting a Backup Heater with a heating ele-
ment (BUH1 / BUH3), the parameter [Function Heat-
ing]=2 must be set.
Fig. 4-36 Connection Backup Heater with a heating element (BUH1 /
BUH3) (for legend see fig. 4-34)
Warning!
When contacting a damaged connec-
tion cable of the Backup Heater this can
cause electrocution and thus cause life-
threatening injury and burns.
Ɣ Do not repair the connection cable of
the Backup Heater.
Î Always replace the complete
Backup Heater.
Caution!
Risk of voltage arcing.
Ɣ The connections on the RTX-EHS
circuit board must not be used for
switching the mains voltage (~230 V)
and protective low voltage (SELV =
"Safety Extra Low Voltage") at the
same time.
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