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LR, LRK, LR-NT, LRK-NT 21 - 32
We reserve the right to make changes to dimensions and construction 38 edition 30.10.2007
© Copyright YGNIS AG CH-Ruswil
6.8. Flue gas system
The pertinent rules of technology and good practice as well as the country-specific regulations and valid
standards must be observed.
The Pyronox LR boilers have been developed using the latest technologies. The perfect balance existing between
boiler and chimney ensures optimal fuel use and economical system operation as a result.
6.8.1. Section determination
Sections must be calculated for boilers without draught.
Fuel type, power output, combustion gas temperature and quantity, chimney construction and height are all
important elements in determining sizes.
6.8.2. Flue gas tubes Pyronox LR, LR-NT
We recommend the use of flue gas tubes made from acid-resistant, non-corrosive materials. The tube must be
laid and introduced in the chimney to an inclination of 30-45° to minimize pressure loss. The tube will have to be
inserted in such a way as to prevent any condensation reversal from the chimney down into the boiler. To avoid
vibration transmission, combustion gas tubes must be fitted with adequate sleeve tubes or clamps. Connections
exceeding 1 m in length should be insulated.
At the same time, ensure that the measuring pipes extend beyond the insulation and that flanges and cleaning
covers remain accessible.
The chimney must be designed so that it is gas and pressure-tight as well as moisture-insensitive and acid-
resistant.
6.8.3. Flue gas tubes Pyronox LRK, LRK-NT
Depending on the return temperature, the flue gases are cooled below the dew point in the recuperator and leave
the boiler with 100% moisture. As a result of the flue gas cooling in the flue gas tube, more condensate is
eliminated. The flue gas unit must therefore be absolutely acid-resistant and condensate-tight, in addition to being
gas and pressure-tight.
The tube must be laid and introduced in the chimney to an inclination of 30-45° to minimize pressure loss. To
avoid vibration transmission, combustion gas tubes must be fitted with adequate sleeve tubes or clamps.
Connections exceeding 1 m in length should be insulated. At the same time, ensure that the measuring pipes
extend beyond the insulation and that flanges and cleaning covers remain accessible.
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