Instruction manual GWV 31
is
3.9.3 Parallel connections
The air supply duct and flue gas outlet duct for the GWV 120, 150 and 200 exit
the appliance separately. They must be connected (3.9.2 "Requirements for
flue gas discharge materials") to the concentric wall conduit or roof conduit
using a transition piece.
The following requirements must also be fulfilled:
• The maximum allowed chimney length (A+B (C)) has the following
dimensions:
- 8 metres of uninsulated pipe including 2 bends;
- 20 metres of uninsulated pipe including 2 bends. With a condensation
outlet in the flue gas outlet, within 8 metres of the appliance;
- 20 metres of insulated pipe including 2 bends;
Caution
Contact the supplier for the installation of an insulated pipe.
• maximum number of 45° or 90° bends allowed is 2.
• If you make use of horizontal piping, then this must slope towards the
appliance at a minimum of 5 mm per metre running length!
• The transition piece to convert the air supply and flue gas discharge from
parallel to concentric must be placed immediately before the roof or wall flue
terminal.
• The duct length of the air supply must be approximately the same as that of
the flue gas discharge chimney. Make sure that the chimney discharges into
an area where this is permitted for this type of appliance.
3.9.4 Specifications
Note
For C13 and C33-category appliances, we prescribe the use of a roof or wall
conduit approved for the appliance. Use of an incorrect roof or wall flue conduit
can cause the installation to malfunction.
