Integrated Heating Circulation Pump And 3-Way-Valve; Temperature Sensor; Connecting The Exterior Temperature Sensor Rocon Ot1 - Rotex GCU compact Installation And Maintenance Instructions Manual

4.7.3 Integrated heating circulation pump and 3-way-
valve
The ROTEX GCU compact comes as standard with an integrated
heating circulation pump and, according to the type:
– GCU compact 3xx:
–
– GCU compact 5xx:
– with a 3-way distribution valve (3UV DHW)
– and a 3-way mixer valve (3UVB1).
The heating circulation pump and the 3-way valves are con-
nected at the factory, the valve drive is inserted.
On :
1 Boiler flow (AB)
2 Heater flow (A)
3 Storage tank charging flow (B)
On 3UVB1:
1 Boiler return (AB)
2 Heater return flow (B)
3 Storage tank charging return
(A)
Fig. 4-28 Design of the 3-way valve

4.8 Temperature sensor

Instructions concerning temperature sensors
CAUTION:
Using unapproved temperature sensors or those
which do not match the device can cause considerable
malfunctioning in the regular operation of the ROTEX
GCU compact, damaging the device control.
Use only the ROTEX temperature sensor available
as an accessory.
The ROTEX GCU compact can regulate the flow temperature,
dependent on the weather. The external temperature sensor
(RoCon OT1), which is contained in the scope of delivery, is re-
quired for this function.
ROTEX GCU compact -
4 3-way valve
5.1 Valve drive
- 3UV DHW (black)
- 3UVB1 (black)
5.2 Unlock button for the drive
locking mechanism
5.3 Hand lever
4 x Set-up and installation
The temperatures detected via 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 already factory-connected
and can be plugged directly to the respective sensor, if they need
to be swapped.
The storage temperature sensor is also installed and con-
nected at the factory (NTC resistance).
To regulate a mixer circuit you will need the Mixer Module
(RoCon M1, 15 70 68), which includes the mixer circuit flow
temperature sensor.
Additional information and a detailed description can be
found in the documentation "ROTEX Regulator RoCon
BF". It is included in the scope of delivery of the GCU
compact.
4.8.1 Connecting the exterior temperature sensor
RoCon OT1
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). Thereby, exclude the proximity
of external heat sources (chimney, air shafts) and direct
sunshine.
Place external temperature sensors in such a way that the
cable exit points face downwards (prevents humidity ingress).
CAUTION!
The parallel routing of sensor and mains lines within
an installation pipe can cause considerable malfunc-
tioning in the regular operation of the ROTEX GCU
compact.
Always lay the sensor line separately.
Connect the exterior temperature sensor to a twin-core
sensor line (minimum diameter 1 mm
Install the sensor line to the GCU compact.
Connect the sensor line in the boiler control panel, at the plug
of the connecting terminals 7 and 8 of the 12-pin sensor plug
J8 (see section 4.7.2).
Insert the plug onto the switching panel PCB (fig. 4-29).
Fig. 4-29 Insert the sensor plug J8 onto the switching panel PCB
Close the switching panel.
2
).
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