4
Set-up and installation
Installation and operating instructions
30
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
Fig. 4-27
P-connection kit for Biv device types (example shows
GCU compact 5xx Biv )
A
Connection for inflow (red)
B
Connection for return flow (blue)
4.7
Electrical connection
DANGER: RISK OF ELECTROCUTION
Touching live parts can result in an
electric shock
and
lead to potentially fatal injuries and burns.
▪ Before beginning work on live parts, disconnect all of the
systems circuits
from the power supply
(switch off ex-
ternal main switch, disconnect fuse) and secure against
unintentional restart.
▪ Establishment of the electrical connection and work on
electrical components should only be performed by
elec-
trical technicians
in compliance with valid standards
and guidelines as well as the specifications of the en-
ergy supply company and the instructions in this manual.
▪ Never make constructional changes to connectors or
other electrical equipment components.
▪
Device covers and service panels
must be
replaced
as soon as the work is completed.
All GCU compact control and safety devices are connected ready for
use and tested. Modifications on the electrical installation are dan-
gerous and prohibited. The operator alone shall bear responsibility
for any resulting damage.
The mains connection, outside temperature sensor and other op-
tional applications (e.g. circulation pump) still have to be connected
to the boiler control panel.
4.7.1
Opening the control unit housing and
establishing electric connections
1
Check the supply voltage
(~230 V, 50 Hz
).
2
Switch the mains switch on the boiler control panel of the
GCU compact to "Off".
3
Switch off the circuit breaker in the junction box of the domestic
power supply.
4
Remove the protective cover (see
).
5
Remove the locking screw at top right on the boiler switch panel
(
).
Fig. 4-28
Removing the locking screw
6
Remove the cable cover from the back of the controller housing
(
).
Fig. 4-29
Removing the cable cover
7
When cutting to length and laying cables to be connected, make
sure that the connection is tension-free.
Summary of Contents for GCU compact Series
Page 2: ......
