Requirements For Central Heating Water; Notes For Using Pressure Maintenance Systems - Froling SP Dual compact Operating Instructions Manual

2
Ventilation of the boiler room
Note on standards

2.7.3 Requirements for central heating water

Note on standards

2.7.4 Notes for using pressure maintenance systems

16
Ventilation air for the boiler room should be taken from and expelled directly outside,
and the openings and air ducts should be designed to prevent weather conditions
(foliage, snowdrifts, etc.) from obstructing the air flow.
Unless otherwise specified in the applicable building regulations for the boiler room,
the following standards apply to the design and dimensions of the air ducts:
ÖNORM H 5170 - Construction and fire protection requirements
TRVB H118 - Technical directives on fire protection/prevention
Austria: ÖNORM H 5195
Germany: VDI 2035
Switzerland: SWKI 97-1
Italy: D.P.R. no. 412
NOTICE! Note on filling with make-up water: Always bleed the filling hose before
connecting, in order to prevent air from entering the system.
Observe the standards and also follow the recommendations below:
❒ Max. cumulative value for alkaline earth: 1.0 mmol/l or 100 mg/l (equivalent to
5.6 dH)
❒ Use prepared water which complies with the standards cited above for filling and
makeup water
❒ Avoid leaks and use a closed heating system to maintain water quality during
operation
Pressure maintenance systems in hot-water heating systems keep the required
pressure within predefined limits and balance out volume variations caused by
changes in the hot-water temperature. Two main systems are used:
Compressor-controlled pressure maintenance
In compressor-controlled pressure maintenance units, a variable air cushion in the
expansion tank is responsible for volume compensation and pressure maintenance. If
the pressure is too low, the compressor pumps air into the tank. If the pressure is too
high, air is released by means of a solenoid valve. The systems are built solely with
closed-diaphragm expansion tanks to prevent the damaging introduction of oxygen
into the heating water.
Fröling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
Safety
Design information