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PYROGAS VARINO 65 - 300
We reserve the right to make changes to dimensions and construction 18 Edition 02.09.2015
© Copyright YGNIS AG CH-Ruswil
6.10. Flue gas installation
The pertinent rules of technology as well as the country-specific regulations and valid standards must be
observed.
6.10.1. Requirements
Flue gas installations must be corrosion-resistant, leak-tight in terms of gas and condensate and withstand the
static and operating requirements. The flue mouth must ensure unhindered emergence of the flue gases (a flue
cap is not recommended).
The right choice of the diameters of the flue gas installation will depend on the height of the installation, the
number of elbows to be applied and other factors. The necessary calculations for the dimensioning of the
installation shall be carried out by the manufacturer of the installation who shall ensure that the boundary
conditions related to the available delivery pressure will be in accordance with chapter 4.5 in those cases where
the installation is planned to be operated with a positive back-pressure (appliance type B23P).
Attention: Appliance type B23P is only valid when the appliance is installed with flue systems meeting the norm
EN1856-1 with CE-marking and classified as P (overpressure).
6.10.2. Execution
The condensing unit is to be placed as near as possible to the flue. The connection between the condensing unit
and the flue must be designed with a gradient so that the condensate which is produced can flow from the flue
gas tube into the condensate trough of the boiler. This connection should not contain many bends nor cross-
sectional changes. The connection of the flue gas installation to the boiler must ensure leak-tightness with regard
to gas and condensate. A standard commercial coupling (e.g. Straub coupling) is best suited for this purpose.
The flue gas installation does not have to be provided with it's own condensate drain pipe. The condensate outlet
on the PYROGAS VARINO is dimensioned large enough so that condensate and rain water can be disposed of.
If the flue gas line is made out of material which is not temperature-resistant a safety temperature limiting device
is to be fitted in the flue gas line. This can be delivered completely assembled as an option or supplied by the
flue constructor (regulating thermostats are inadmissible). In the latter case, the potential-free contact must be
connected to the terminals of the boiler control whereby a safe disconnection of the burner is ensured if the
temperature is exceeded (external safety).
It is recommended to ground plastic flue gas lines, since these become statically charged during operation.
6.10.3. Measurement connections for firing control
Measurement connections in accordance with the official regulations must be provided for flue gas, temperature
and pressure measurements in the flue gas tube (supply by flue constructor).
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