5.6 Electrical installation
DANGER
Electric shock when working with voltage applied
The consequence is serious injury or death.
▶
Isolate unit prior to carrying out work and protect against accidental reconnection
to the mains.
The electrical installation must only be carried out by qualified electricians, local reg-
ulations must be observed.
Install Bus and external sensor cable separately and preferably using screened cables
(metal braiding).
Separate ducts are provided for the separate installation of 230 V cables opposite to
Bus and sensor cables (SELV).
▶
Feed the cables from the rear of the unit through the cable ducts to the connection
box.
▶
Assign the inputs and outputs according to application (see Ch. 6.10).
▶
Fit screen of Bus and external sensor cable to the designated screen connection
terminals.
▶
Connect the cables according to the wiring diagram, in the process pay particular
attention to the correct phase location of the voltage supply.
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
5 Installation
83266502 • 1/2010-08 • La
28-95
