In a closed system, there can work only boilers with cooling coil protection against
overheating of the device, if local laws do not state otherwise!
The coil must be connected to the water supply system, absolutely guaranteeing a continuous
supply of water - regardless of electric power supply. Water supply to the protective coil is
controlled by the thermostatic valve, which opens the water flow at the time the boiler has exceeded
the safe operating temperature. The outflow of water from the coil protection should be connected
to the sewer drain. The requirements for thermostatic valves and water supply system are shown in
Table 6.
Temperature initiating the thermostatic valve opening
97ºC
Temperature of the thermostatic valve operation
110ºC
Minimum pressure of the coil supplying water
1,5 bara
Minimum flow of the coil supplying water
2 m
3
/h
Table 6. Parameters of the protective coil thermostatic valve
The presented hydraulic diagrams do not replace the design of central heating installation
and are used for illustrative purpose only!
The above data are informative only!
Apart from them, hydraulic installation of the boiler
must be in accordance with the valid regulations, standards and the construction trade
practices.
It must provide the correct and safe operation of heating equipment.
If required,
the installation should be inspected by the respective authorities!
Holz Master Manual
wer. 22/05/2012/EN/V1.0
HKS LAZAR
str.26
