26
FA ROTEX HPSU compact 4 - 06/2015
4 x Set-up and installation
Connection variant 3
4.4.15 Connection of an external heat generator
For heating support or as an alternative to an electrical Backup
Heater (see section 4.4.14) 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 C
arry 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 unit types ROTEX HPSU compact ... BIV, via the
integrated pressurised solar heat exchanger.
– Observe the instructions concerning hydraulic connections
(see chap
ter 2.5)
– Examples of hydraulic connection (see chapter 9).
Demand from an external heat generator is switched to the RTX-
EH
S circuit board via a relay (see fig. 4-29). 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 [Funktion EHS]=2)
or
– Connection to K1 and K3 if two external heat generators
are be
ing used (setting parameter [Funktion EHS]=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 4.4.19)
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 Suitabl
e electrical connection from the relevant installation
instructions for the external heat generation.
Ɣ Connect external heat generation to the ROTEX HPSU
compact (fig. 4-29).
Connection X1 is a screw terminal.
Isolated 6.3 x 0.8 mm push-on receptacles are required for
conn
ections X2_1/2/3.
When connecting a Backup Heater with a heating ele-
ment (BUH1 / BUH3), the parameter [F
unktion EHS]=2
must be set.
Fig. 4-28 Connection Backup Heater with a heating element (BUH1 /
BUH3) (for legend see fig. 4-26)
Warning!
When contacting a damaged connection 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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