INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Bisolid Automat OM-BAV05/02/2018/EN
62
Table 18. Boiler water parameters
Parameter
Measurement
Unit
Value
Hardness
mmol/l
1
Ca
2+
mmol/l
0.3
Total concentration of Fe + Mn
mg/l
(0.3)*
* - recommended value
Liquid with low freezing point and anti-corrosion effect can be used as passive protection of
the boiler. In the event, a two-way safety valve is connected to the system, the application of
anti-freezing liquid is not recommended.
9.5. CONNETING THE BOILER TO THE HEATING SYSTEM
9.5.1. BOILER EXCESS HEAT RELEASE
The cooling loop is designed to release excess heat from the boiler to avoid exceeding the
maximum allowed boiler water temperature of 95 °C. Connecting the cooling loop to the boiler
flanges is shown in Figure 23 and to the two-way safety valve in Figure 25. In the event of
boiler overheat (the output water temperature exceeds 95°C), the thermostatic valve switches
on and the excess heat is being released by the cooling loop.
The two-way safety valve DBV 1 is used to release the excess heat in order to avoid
exceeding the maximum permissible temperature of the water in the boiler i.e above 95 °C. In
the event the system is equipped with a protective device against overheating, but
nevertheless the boiler overheats (the output water temperature is higher than 95
0
С
), the
protective device creates a cold water cycle, which remains active until the temperature
decreases below the limit value. At this point, the discharge cooling device and the cold water
running through the system close simultaneously.
Table 19. Two-way safety valve technical data
DBV 1 (Regulus)
9.5.2. PURPOSE OF THE TWO-WAY SAFETY VALVE
It is imperative to install the two-way safety valve. The installation of the
two-way safety valve is performed by a qualified and competent specialist!
Parameter
Dimension
Value
Shutdown temperature
°C
100 (+0-5°C)
Maximum temperature
°C
120
Boiler maximum pressure
bar
4.0
Water maximum pressure
bar
6.0
Nominal flow rate at
∆
p 1bar
m
3
/h
1.9
