Servicing
31
10.4 Connecting to the Heating System and Water Filling
Water for filling the boiler and the heating system must be clear and colorless, with no suspended
substances, oil and chemically aggressive substances. The parameters of circulation and refilling water shall
meet:
The highest permissible heating water values according to
Č
SN 07 7401
Hardness
(mmol/l)
1
Ca2+
(mmol/l)
0.3
Concentration of total Fe + Mn
(mg/l)
(0.3)*
* a recommended value
When the water hardness does not meet the required parameters, it shall be treated accordingly. Several
times reheated water with a higher hardness does not prevent precipitation of salts on the walls of the boiler
body. The precipitation of limestone decreases the heat transfer from metal to water at the particular point by
10 %.
During the heating season it is necessary to keep a constant volume of heating water in the heating system
and be particular about bleeding the heating system. The water from the boiler and the heating system shall
never be discharged or taken for some other use except in cases of emergency like repairs etc. Draining of
the heating water and filling new water increases the danger of corrosion and scaling. If it is necessary to
refill water into the heating system, then add water only when the boiler is cold.
When adding water to the boiler, the system shall be disconnected from electric power supply. The bleeding
valve on the boiler and on the heating system shall be functional and open. Adjust the expansion reservoir to
a pressure which is higher by 10 kPa than the required pressure in the heating system. The system will be
pressurized to the required pressure of approx. 100 kPa and it will be vented again. We recommend using
the filter on the inlet to the heating system for water filling.
The heating system shall have a sufficient number of venting points. The lowest point of the heating system
shall be equipped with a drain valve.
10.5 Gas Connection
Prior to connecting the gas pipeline to the boiler, the gas pipeline shall be tested and subjected to revision
inspection. After connecting the boiler to gas pipeline, all gas connections shall be tested again by means of
a detector or foaming solution. The input pressure of natural gas shall correspond to the value in table no. 1.
10.6 Electric Power Supply Connection
The boiler is equipped with a flexible mains supply and a plug. According to
Č
SN EN 60 335–1 ed. 3
the boiler shall be placed in such a way that ensures that the plug is freely accessible.
A 230 V/50 Hz socket should be located beside the boiler within a distance of 1.5 m. The socket shall
correspond to the effective regulations and it shall be subjected to revision inspection.
10.7 Condensate Discharge
A built-in siphon (trap) serves as the condensate outlet. It must be connected to a sewerage overflow. Prior
to the commissioning of the boiler, it is necessary to check whether the condensate is being drained. The
size of a PVC drain pipe is Ø 16mm. The pH value of this condensate is < pH 3 and it can be discharged to
the sewerage.
The boiler condensate outlet shall be implemented in such a way that ensures that it does not prevent fluent
discharging of the condensate.
The boiler is equipped with an odor trap (siphon) that needs to be filled with approx. 100 ml of water before
starting of the boiler. Discharging of the condensate to the sewerage is governed by the national or regional
(local) regulations. The drain pipe inclination shall be at least 5° from the boiler to the sewerage and it shall
not be blocked in any way (when the condensate drain pipe is blocked, the boiler furnace will resonate).
10.8 Flue Gas Ducting
See chapter 11 - Flue Gas Ducting
