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Set-up and installation
FA ROTEX HPSU monobloc compact • 09/2017
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4.5.11 Connecting an external heat generator
For heating support or as an alternative to an electric backup
heater (see chap. 4.5.10), an external heat generator (e.g. gas-
or oil-fired boiler) can be connected to the ROTEX HPSU mono-
bloc compact.
The heat supplied by the external heat generator must be fed to
the unpressurised storage tank water in the ROTEX HPSU
monobloc compact's hot water storage tank.
Ɣ
Implement the hydraulic connection according to one of the
two following options:
a)
unpressurised via the connections (solar feed and
solar return) of the hot water storage tank
or
b)
in the case of ROTEX HPSU monobloc compact …B
device types, via the integrated pressurised solar system
heat exchanger.
–
Observe notes on hydraulic connections (see chap. 2.4)
–
Examples of hydraulic connection (see chapter 9).
The external heat generator request is connected via a relay on
printed circuit board RTX-EHS (see fig. 4-35). Electrical connec-
tion to the ROTEX HPSU monobloc compact is possible as fol-
lows;
a)
External heat generator has a potential-free switching
contact connection for heat request:
–
Connection to K3 if the external heat generator under-
takes hot water preparation and heating support (setting
of parameter [Function Heating Rod]=2)
or
–
Connection to K1 and K3 if two external heat generators
are used (setting of parameter [Function Heating Rod]=3).
In this case, K1 connects the external heat generator (e.g.
gas- or oil-fired boiler) for heating support and K3 con-
nects the external heat generator (BUxx) for hot water
preparation.
or
–
Connection to AUX connection A (see chap. 4.5.15)
b)
External heat generator can only be connected via mains
voltage:
connection (~230 V, maximum load 3000 W) to K1 and
K3.
Ɣ
Refer to the external heat generator's respective installation
instructions for a suitable electrical connection.
Ɣ
Connect the external heat generator to the ROTEX HPSU
monobloc compact (fig. 4-35).
Connection X1 is designed as a screw terminal.
CAUTION!
Danger of voltage flash-overs.
Ɣ
The connections of printed circuit board RTX-
EHS must not be used simultaneously for
connecting mains voltage (~230 V) and
SELV ("Safety Extra Low Voltage").
K1/2/3
Relays for backup heater
L
Phase
N
Neutral conductor
PE
Protective earth conductor
RTX-EHS
Printed circuit board (backup
heater)
X1
Terminal strip for backup
heater mains connection
X3
Internal wiring plug connec-
tion to RoCon BM2C printed
circuit board
Fig. 4-35 Connections on printed circuit board RTX-EHS