Operating Instructions and Installation Instructions

VARINO GRANDE 350 - 600
We reserve the right to make changes to dimensions and construction 19 Edition 10.07.2015
© 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
Waste 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 waste 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 4.4 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 waste
gas tube into the condensate trough of the boiler. This connection should not contain many bends nor cross-
sectional changes. The connection of the waste gas installation to the boiler must ensure tightness with regard to
gas and condensate. A standard commercial coupling (e.g. Straub coupling) is best suited for this purpose. The
waste gas installation does not have to be provided with it's own condensate drain pipe. The condensate outlet
on the VARINO GRANDE is dimensioned large enough so that condensate and rain water can be disposed of.
If the waste gas line is made out of material which is not temperature-resistant a safety temperature limiting
device is to be fitted in the waste 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 waste 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 waste gas,
temperature and pressure measurements in the waste gas tube (supply by flue constructor).