4
Set-up and installation
Installation and operating instructions
33
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
Fig. 4-34
Installing the cable cover
16
Close the front panel and screw in the locking screw.
CAUTION
Clamped cables can cause short-circuits and malfunctions.
▪ When closing the front panel, make sure that cables are
not jammed.
17
Attach the protective cover.
18
Establish the mains connection between the GCU compact and
the circuit breaker in the junction box of the domestic power sup-
ply (see
▪ Use an all-pole separating main switch on the junction box of
the domestic power supply (separate isolator in accordance
with EN 60335-1).
▪ Ensure that the polarity and earthing is correct.
19
After completion of all electrical connection tasks, re-establish
the power supply to the relevant circuit breaker.
4.7.2
Integrated heating circulation pump and
3-way valve
The GCU compact is equipped as standard with
▪ an integrated heating circulation pump
▪ a 3-way distribution valve (3UV DHW)
▪ a 3-way mixer valve (3UVB1)
.
The heating circulation pump and the 3-way valves are connected at
the factory, the valve drive is connected.
Fig. 4-35
Set-up and position assignment of 3-way valves
4.7.3
Temperature sensors and further
electrical components
Instructions for temperature sensors
CAUTION
The use of temperature sensors that are not approved or
unsuitable for the device can lead to major malfunctions
during controlled operation of the GCU compact and impair
the control function of the device.
▪ Only use the temperature sensors available as ac-
cessories from us.
The GCU compact can regulate the inflow temperature on a
weather-compensated basis. The outside temperature sensor (Ro-
Con OT1) contained in the scope of delivery is required for this func-
tion. For information on the installation location and electrical con-
nection, see
.
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 temper-
ature sensors are connected in the factory and can be connected to
the appropriate sensor directly upon replacement.
The
storage tank temperature sensor
is installed and connected to
the terminals at the factory (NTC thermistor).
To regulate a mixer circuit, the (RoCon M1) mixer module is needed
that contains the mixer circuit inflow temperature sensor.
Further electrical 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 to the control
panel (see
) via the
J13
circuit board con-
nector.
J8 circuit board connector
Additional switching contacts for external boiler control can be con-
nected to the
J8
circuit board connector.
Summary of Contents for GCU compact Series
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