Viadrus CLAUDIUS K 2 Series, Manual For Operation And Installation

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7 Commissioning
7.1 Connection to the heating system and filling with water
Before filling the heating system with water the system should be duly cleaned, it means that the system should be
twice filled with clean water and drained.
Water for the boiler and the heating system filling must be clear and colourless, without suspended solids,
oil and aggressive chemicals. The heating system must be filled with water that meets the requirements of
CSN 07 7401 and especially its hardness must not exceed the required parameters.
The parameters of circulating and make-up water must correspond to the following:
Tab.
№
. 5 The maximum permissible values of heating water according to CSN 07 7401
Recommended values
Hardness mmol/L 1
Ca
2+
mmol/L 0.3
Total Fe + Mn concentration mg/L (0,3)*
*recommended value
ATTENTION!!! The manufacturer does not recommend the use of antifreeze.
If the water hardness is unsuitable it has to be adjusted. Even the multiple heating of water with a higher hardness
does not exclude salts on the boiler body walls. Precipitation of 1 mm calcite reduces at a given point the heat
transfer from the metal to water by 10%.
During the heating season, it is necessary to maintain a constant volume of heating water in the heating system
and ensure that the heating system is vented. Water from the boiler and the heating system must never be drained
or taken for usage except for the emergency cases like repairs etc. Heating water discharge and filling with new
water increases the danger of corrosion and scaling. If it is necessary to refill water in the heating system, refill
only the cold boiler in order to avoid disruption.
Before filling the system with water, shift a three-way valve control lever into the intermediate position using a
screwdriver or manually by pulling it toward yourself slightly down (if the boiler has the option of feeder water
preparation) Fig. No. 9. After filling the heating system, dismantle the water valve drive by pushing the metal push
button and turning right. After remounting the water valve drive, the lever comes back to the position for heating the
heating system.
Lever shifted in the intermediate
position when filling the heating
system and water heater
Lever in the position for HW heating Lever in the position for heating the
heating system
Fig. № . 9 Three-way valve VC 4013
When filling the boiler with water the system must be disconnected from the mains. Bleeder valve on the boiler and
on the heating system must be open and functional.
Adjust the expansion vessel to a pressure of 10 kPa
(0.1 bar) higher than the pressure required in the heating system (only for the version
CLAUDIUS
K 2 L31, CLAUDIUS K 2 L33). The system is pressurized to the desired pressure of about 100 kPa (1 bar) and
again vented. For filling water, it is recommended to use a filter on the heating system inlet.
The heating system must have a sufficient number of vents. Drain valve must be installed at the lowest point of the
heating system.
The expansion tank is 8 L volume and its volume is sufficient for 150 l of water in the heating system. The
expansion tank is not mounted for the version CLAUDIUS K 2 L5X.
The system should be designed to a temperature gradient of 55/45 °C with respect to condensation use.
Condensing boiler can be used also for old self-load systems which were pre-dimensioned and thus condensation
can be efficiently used also for this system, but the system should be supplemented with a corresponding
expansion tank.