Rotex GCU compact 315, Installation And Maintenance Instructions Manual

Page: 37 / 84

4 x Set-up and installation
The temperatures detected by the internal temperature sensors
(flow and return flow temperature sensors, internal mixer
sensors) are used to control the burner's output and to detect
faults. The temperature sensors are connected in the factory and
can be connected to the appropriate sensor directly upon re-
placement.
The storage tank temperature sensor is installed and con-
nected to the terminals at the factory (NTC thermistor).
To regulate a mixer circuit the ( RoCon M1, 15 70 68 ) mixer
module is needed that contains the mixer circuit inflow temper-
ature sensor.
Further electric components can be connected to the circuit
board connectors:
J13 circuit board connector
Further optional control system components in the CAN bus
system (room controller, mixer module etc.) are connected over
the
J13 circuit board connector to the control panel (see
chap. 4.7.5 to 4.7.7).
J8 circuit board connector
Additional switching contacts for external boiler control can be
connected to the
J8 circuit board connector.
– An external operating mode switchover can be made by a
potential-free switching contact connected to terminals 1+2
(EXT) .

When the switching contact is closed switchover is made to
the assigned operating mode depending on an intercon-
nected resistance - see chap. 4.7.9 and function "Operating
mode switchover over EXT input" in the "ROTEX controller
RoCon BF" documentation.
– An external heat request can be made by a potential-free
switching contact connected to terminals 3+4 (EBA) .

When the switching contact is closed the target inflow temper-
ature is set to the value configured by the parameter [T-Flow
Day] on the RoCon BF controller.

The EBA switching contact has priority over a request from
the room thermostat.

Switching by the EXT switching contact has priority over this
request.
Terminals 11+12 (t
AG/WP
) are not occupied for these devices and
are available for additional functions.
J3 circuit board connector
An external control, acquisition or display device (e.g. lamp) can
be connected to the internal switching contact on the
J3 circuit
board connector (terminals A+A1,A2) . Different connection
conditions must be complied with depending on the model of the
external device (see fig. 4-37).
The condition for the switching function can be set by the param-
eters [AUX Fct] and [AUX time] on the RoCon BF controller (see
the operating instructions for the controller).
The relays user for variant 2 (switched output > 15 W) must be
suitable for a 100 % power-on time.
Connection terminals B+B1 are not occupied for these devices or
are available for additional functions
J16 circuit board connector
A room thermostat (potential-free switching contact) can be con-
nected to the
J16 (terminals 1+2) circuit board connector (see
chap. 4.7.8). A connected room thermostat has to be activated by
parameter [Room thermostat] on the RoCon BF controller.
In "Heating" operating mode and during the active heating
phases of the time program, a closed switching contact causes a
heat request. This request has priority over the switching func-
tions connected over the J8 circuit board connector (exception
EBA switching contact).
Frost protection functions are also active when the switching
contact is open.
Terminals 3+4 are not occupied for these devices and are
available for additional functions.
4.7.4 Connecting the RoCon OT1 external
temperature sensor
● Choose a location at about one third of the building height
(minimum distance from floor: 2 m) at the coldest side of the
building (North or North-East). Ensure that the location is not
near to any external heat sources (flues, air ducts), nor
subject to direct solar radiation.
● Place external temperature sensors in such a way that the
cable exit points face downwards (prevents humidity ingress).
Fig. 4-37 Connection of switching contact (AUX output)
You will find further instructions and a detailed descrip-
tion in the "ROTEX RoCon BF" controller documenta-
tion. It is included in the scope of delivery for the
ROTEX GCU compact.
CAUTION!
Laying the sensor and mains lines in parallel within a wiring
conduit can lead to major malfunctions during regular operation
of the ROTEX GCU compact.
● Always lay the sensor line separately.