Installation and operating instruction
Gas condensing unit WTC-GB 15-B Compact and WTC-GB 25-B Compact
5 Installation
83309302 1/2018-05 La
45-196
5.6 Air supply / flue gas duct
Air supply duct
The combustion air can be supplied:
from the installation room (room air dependent operation),
through concentric piping systems (room air independent operation),
through separate air duct in the room (ducted air intake).
Flue gas system
Local and building regulations must be observed when designing the flue gas duct-
ing.
Only approved flue gas systems may be used.
If the appliance is connected to a chimney, this must be damp proof.
Install the flue gas system at the flue gas connection.
1
3
2
1
Measuring point in supply air annular gap
2
Flue gas test point
3
Boiler connection piece (accessory)
The flue gas system must be sound:
carrying out soundness test of the flue gas system.
If a plastic flue gas system is connected, which is not approved for flue gas temper-
atures of up to 120 °C, the
maximum shut off temperature
must be re-