K4
Changes in models reserved.
Dimensions not binding!
Installation
8.3 Connection To The Heating System And Water Filling
Water for filling the boiler and the heating system must be clear and colorless, with no suspended sub-
stances, oil and chemically aggressive substances. The parameters of circulation and refilling water
must meet the table on page 36.
If the water hardness does not meet the required parameters, it must 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. The water from the boiler and the heating system must 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 must be disconnected from electric power supply. The
draining valve on the boiler and on the heating system must be functional and open. Adjust the expan-
sion vessel to a pressure which is 10 kPa over the required pressure in the heating system. The system
will be pressurised to the required pressure of approx. 100 kPa and then has to be vented again. We
recommend using a filter on the inlet to the heating system for water filling.
The heating system must have a sufficient number of venting points. The lowest point of the heating
system must be equipped with a drain valve.
8.4 Gas Connection
Prior to connecting the gas pipeline to the boiler, the piping must be tested and subjected to revision
inspection. After connecting the boiler to the gas supply, all gas connections must be tested again
with the help of a detector or foaming solution. The input pressure of natural gas must correspond to
the value on page 7.
While checking the tightness of the gas distribution and the valve connection, it is necessary to be
careful not to wet the coil of the gas valve!
8.5 Electric Power Supply Connection
The boiler is equipped with a flexible power supply line and a plug. According to EN 60 335–1 ed. 3
the boiler must be placed so 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 must
correspond to the effective regulations and it must be subjected to revision inspection.
8.6 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 24 mm. The pH value of this condensate is > pH 3.
The boiler condensate outlet must be implemented in such a way so it does not prevent fluent dischar-
ging 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 natio-
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