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7. Preparing the boiler for commissioning
Prior to putting the boiler into operation, the conditions stipulated under the relevant ČSN must be adhered to (such as chimney
inspection and approval of fitness for purpose by the Chimney Authorities, a heating system designed calculated for this type
of boiler, completion of a heating test, etc.).
Installation of the boiler is conditioned by the connection of the controlled mixing valve in the primarily heating water circuit and
connection of a safety discharge valve, TS 130. The connection of the safety discharge value is mainly necessary in the event
of a use of an uncontrolled mixing valve in the primary heating water circuit. In the event that the specified safety discharge valve
is not used, emergency removal of the residual heat in the event of power failure needs to be ensured while designing
the heating system and installing the boiler, where the pumps and the servo-drives of the mixing valves are blocked.
At the beginning of the heating season, it is always necessary to check the filling and de-aeration of the heating system!
7.1 Binding standards in designing and installing the boilers
ČSN 06 0310 - Heating systems in buildings – Design and installation
ČSN 06 0830 - Heating systems in buildings – Safety equipment
ČSN 73 4201 - Chimneys and smoke ducts – Designing, executing and connecting fuel material consuming appliances
ČSN 06 1008 - Fire safety of local heating appliances and heat sources
ČSN 07 0240 - Hot water and low pressure steam boilers
ČSN 07 0245 - Hot water boilers with power up to 50kW
ČSN EN 13501-1 - Fire classification of construction products and building constructions – Part 1:
7.2 Boiler connection to the hot water system
The boiler shall be connected to the heating system using flanges to be welded onto the pipes of the heating system. A
gasket must be inserted between the flanges and bolted together using M8x25 bolts. A TS 130 safety discharge valve shall be
fitted. The fixture must be bolted to one of the lateral 3/4" outlets and a measuring probe shall be inserted into the sink between
the outlets. Connect the cold water branch of the water mains to the TS 130 fixture. Connect the sanitation outlet to the other 3/4"
outlet. In the event of boiler overheating, the thermostatic valve integrated in the fixture shall open the cold water supply into
the cooling loop. After passing through the cooling loop, the cooling water flows spontaneously away into the sewerage system.
Once the boiler has cooled down, the water flow rate is automatically stopped.
Connection of the safety outlet fixture is a pre-condition to safe boiler running. The boiler may only be connected
up by an expert company or a professional heating engineer.
Safety valve connection chart
The boilers are partially protected against overheating by a safety thermostat. The thermostat switches off the fan once the water
temperature in the boiler exceeds 95
in the boiler passing into the steady heating mode and gradually reducing its power. Once the boiler water temperature drops
o
by approx. 15
C, the safety thermostat will switch the fan back on and the boiler will ramp up to the required power.
The present system of boiler protection only works reliably under the condition of steady supply of pressurised cold water
from the water mains (pay attention to domestic water plants in the event of power failures). Please also note that the safety
systems described above are only fully and reliably functional under the condition of electric power supply. Therefore, the very
issue must be addressed, for hot water systems with forced circulation, by connecting a part of the heating system to a gravity
circulation circuit with the minimum power consumed being at the level of 20% of the nominal boiler power, as a minimum
requirement.
Classification based on response to fire test results
o
C (the condition being moreover indicated by the failure indicator LED). This will result
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