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The water used for filling boiler and heating systems must be clear and colourless, without
suspended solids, oil and aggressive chemicals. Its hardness must comply with ČSN 07 7401:
1992 and it is essential that in case the water hardness does not comply, it must be treated.
Even multiple heating of water with a higher hardness does not stop salt build-up on the walls
of the exchanger. 1 mm of calcite reduces the heat transfer from metal to water at the given
point by approximately 10%.
Heating systems with an open expansion tank allow direct contact between the heating water
and the atmosphere. During the heating season the water expanding in the tank absorbs
oxygen which increases corrosion and at the same results in significant water evaporation.
Refilling can only be performed with water treated according to ČSN 07 7401:1992. The
heating system must be thoroughly flushed in order to wash out all impurities.
During the heating season it is necessary to maintain a constant volume of water in the
heating system. When refilling the heating system with water no air must be sucked into the
system. The boiler and heating system water must never be discharged or taken for use
except in emergencies like repairs etc. Water discharge and filling with new water increases
the danger of corrosion and scaling.
If it is necessary to refill the heating system with water only do this when the boiler is cold to
prevent damage to the steel heat exchanger.
b) Heating system tightness
c) Connection to the chimney - must be approved by a chimney sweeping company
d) Provide for proper sealing of the grate into the mixer by means of stove sealant (with a
temperature resistance of 1200 °C)
e) Electric connection
The sockets are connected so that the protective plug is upwards and the phase conductor
is connected to the left tube when viewed from the front. The same applies to double
sockets.
The assembly completion and heating test must be recorded in the "Guarantee certificate".
6.5. Putting into operation
1. Fire the boiler.
2. Bring the boiler to operating temperature. The recommended operating temperature of the
output heating water is 65 to 80 °C.
3. Check the boiler tightness again.
4. Carry out the heating test according to relevant standards (see the Guarantee certificate)
5. Acquaint the user with the boiler operation - see chapter 7.
6. Make a record in the Guarantee certificate.
7. Boiler operation by user
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