In order to ensure the required return water temperature the following
solutions are suggested:
Higher settings on the boiler (possible only with low external temperatures).
Recommended
use of a mixing system based on the application of a three-way mixing valve
with a boiler circulator (the solution ensuring the proper temperature of both
the return water and the central heating system)
Boiler water requirements:
water for filling up boilers and heating installations should comply with the
requirements of the PN-93/C-04607 standard,
the boiler water should have the following parameters:
- pH value > 8.5
- total hardness < 20of
- free oxygen content < 0,05 mg/l
- chlorides content < 60 mg/l.
the used water treatment technology for filling up the heating installation
should comply with the requirements referred to above,
In the event of failing to comply with the above-mentioned requirements,
THERMOSTAHL may withdraw the guarantee for the installed boiler (boilers).
4.6. Chimney system
It should be installed as an acid-proof, double-wall, insulated chimney, or in
the case of chimneys made of brick, comply with the requirements of the
PN89/B-10425 standard; the technical parameters of the chimney should
ensure its protection against the effects of the condensate resulting from
cooling of the flue gas. Use of acid-proof chimney inserts (tin, stoneware, etc.)
is recommended.
The section of the chimney can be calculated following the formula provided
below:
D = 20(3+P)
1/2
[m
2
]
; where: D-diameter in mm, P-boiler power rating in kW.
The chimney diameter may not be less than the diameter of the flue.
Connecting several boilers to one common chimney flue is not recommended.
The connection of the boiler to the chimney should be thermally insulated and
run the shortest possible way with the least possible number of pipe elbows,
with the appropriate height of the flue towards the chimney.
The chimney should be freely open towards the top and built at least 1 m
above the roof,
The diameter of the flue gas duct should be selected (calculated) in
accordance with the recommendations of the manufacturers of the chimney
inserts, however it should not be less than the diameter of the boiler flue.
Installation of an inspection door for removing combustion residues should be
envisaged,
The entire length of the chimney should be maintained clean,
