15
7.5.
CONNECTING BOILER TO CHIMNEY.
Method of connection of flue and connection to it should be in
accordance with the requirements of Regulation of the Minister of
Infrastructure of 12 March 2009 on technical conditions which should be
fulfilled by buildings and its location /Journal of Laws 56/2009 item 461/.
The smallest size of cross-section or diameter of brick flues with
natural draught and smoke ducts should be equal to at least 0.14 m, and
in the case of use of steel, chimney inserts the smallest size of diameter -
at least 0.15 m.
In case of installation of the boiler in a country other than Poland
connection to the chimney should fulfill the requirements of standards and
legal regulations in force in the country of destination.
In order to connect the boiler to the chimney, a steel section of
appropriate intersection and shape is to be used. This section should be
sealed on flue gases outlet from boiler and outlet of boiler and the length
should not exceed 400 - 500 mm. The connection should be made from a
steel plate of thickness of at least 3 mm. The connection should decline
towards the boiler.
It is necessary to foresee self-closing and self-sealing openings for
measurement of flue gas emission on the connection with the chimney.
The appropriate height and the intersection of the chimney as well as
the precision of its execution have a significant impact on the
maintenance of required chimney draught. Usability of the chimney for
operation should be confirmed by the authorized chimneysweep.
Approximate sizes of flue can be calculated using Sander’s formula.
Boiler water should have the following parameters:
•
pH reaction: 8.0÷9.5
- in steel and cast iron systems;
8.0÷9.0
- made of copper and mixed materials steel/copper;
8.0÷
8.5 - for systems with aluminum radiators;
•
total hardness < 20°f
•free oxygen content <0.1 mg/l, recommended <0.05mg/l
•chlorines content <60mg/l.
Hint!
Before connecting the boiler to old central heating system
user should carry out flushing to remove sludge remaining
in the radiators and pipes.
The system is to be filled with water before the boiler is started.
Filling the boiler and the system with water should be made by means of
a boiler's release socket. This process should be carried out slowly in
order to deaerate the system.
To check if the system has been filled with water, the straight-run
valve located on the signaling pipe should be opened for a few seconds.
Continuous water outflow means that the system has been filled in
correctly. Any water refills should take place in the boiler's inactivity
period. If necessary, water can be drained, upon cooling it down, through
a release socket to a sink or a floor drain.
Note!
It is unacceptable and strictly forbidden to refill water during
the boiler's operation, especially when the boiler's
temperature is high as it may lead to its damage or crack.
where:
Q - power of heat source, [W]
a - coefficient taking into account type of fuel and type of chimney, for
solid fuel fired boiler 0.03
h - chimney's height measured from grate to output, [ m ]
Hint!
Too weak chimney draught causes deposition of steam on
walls of the heat exchanger, what leads to quick destruction of
the boiler. It can also cause smoking from upper doors and
cleaning holes of the boiler.
Hint!
The boiler operates in flue gas negative pressure on the outlet
from the boiler.
It is essential that the chimney will start from the level of the boiler
room floor because flue gases getting out of the boiler should have a
reflection possibility. It is also important to have a cleanout opening with
tight closure in the lower part of the chimney.
The chimney should be led vertically above the roof, at the height
protecting against inadmissible disturbances of draught and protected
with a cap. Flue's walls should be smooth, tight, without neckings and
bends, and free from other connections. A new chimney must be dried
and heated before starting up the boiler. In case of any doubts, the
chimney's condition is to be assessed by a chimneysweep. Chimneys
made from steel pipes should be about 15-20% higher than brick
chimneys.
Hint!
To connect the boiler to the chimney, only flue gas
extensions recommended by the manufacturer should be
used. Using non-genuine elements may invalidate the
warranty for the device.
Hint!
Due to high efficiency, for the DWS boilers, it is
recommended to use chimney inserts made of stainless acid-
resistant steel.
Note!
Water can be refilled only due to its losses by evaporation.
Other decrements such as system leakage are inadmissible
as they may lead to creation of boiler scale resulting in
permanent damage of the boiler.
8.2. BOILER START-UP /INSTRUCTION FOR SERVICE/.
Hint!
Only the AUTHORIZED SERVICE of the MANUFACTURER may
check the correctness and integrity of the boiler connection,
preparation for operation according to this manual and
applicable regulations and first start-up and train the user
within the scope of boiler operation and servicing.
Failure to observe the above recommendations will void the
warranty for the equipment.
Prior to the start-up, the steps below are to be followed:
• check if the central heating system has been filled with water;
• check heating system tightness;
• check
the correctness of chimney connection;
• check
the tightness of the contact surface of cleaning holes;
• method of connection
to the electrical system /if applicable/.
Boiler's start-up sequence of operation:
• surfaces adjacent to the ceramic nozzle should be sealed with a heat
-resistant
sealant (1500
°
C);
• start the boiler;
• start the furnace according to
instructions provided herein - point 8.3.;
•heat up the boiler to appropriate operating temperature; recommended heating
water output temperature on outlet equals to at least 65°C;
Hint!
If the required draught cannot be achieved it is necessary to
use the supporting fan /option/.
8.
USAGE AND OPERATION.
8.1.
FILLING WITH WATER.
Water quality has an essential influence on the life of the boiler and
the efficiency of operation of heating equipment and the whole Plant.
Water with wrong parameters is a reason of corrosion of heat transfer
surface of heating equipment, and transmission pipes and causes
formation of scale. It can also lead to damage or destruction of the
heating system. Boiler's water should be free from mechanical and
organic pollutants and should meet the requirements of PN-93/C-04607
standard. Observation of the requirements concerning the quality of
boiler water is a basis for possible warranty claims.
Hint!
Information about installation and the heating test run is to be
noted in the Warranty Card.
A filled in Warranty Card is to be sent by the user to the
manufacturer in order to register the user in the Company's
database.
• check boiler's tightness once again;
• perform flue gas emission measurement with flue gas analyser;
• carry out a heating test run according to the standards;
•instruct the user within the scope of
correct operation;
• make appropriate annotation in the Warranty Card.
