11
Fig.no.4c)
Diagram of VIADRUS HERCULES U 26 boiler - location of additional equipment
3.3
Equipment for surplus heat removal
The after-cooling loop or the two way safety vent DBV 1 - 02 serves for surplus heat removal in case
the water temperature in boiler exceeds 95 °C.
The after-cooling loop is connected to the boiler flanges according to Fig. No. 5, the two way safety
vent according Fig. No. 7.
In case of boiler overheating (the output water temperature exceeds 95 °C) the thermostatic valve switches
on and the superfluous heat is led off via an after-cooling loop.
Fig. No. 5 Hydraulic chart of after-cooling loop connection
In case the system is equipped with a two way safety vent and the boiler becomes overheated (the output
temperature exceeds 95 °C) the two way safety vent creates a cold water circuit which is kept until the
temperature drops below the limit temperature. At this moment there are simultaneously closed the
discharge cooling equipment and the cold water inlet of refilling the system.
1 – Heating water outlet into the system 2”
2 – Reverse water inlet from the after-cooling loop 1 1/2 “
3 – Reverse water inlet into the boiler from system 2”
4 – Cooling water outlet
5 – Thermostatic valve TS 130 (STS 20)
6 – Heating water outlet from boiler 2 “
7 – Cooling water inlet
1 – rear lining
2 – upper lining
3 – ceramic insert (3 – 10 sect.)
4 – additional grate (3 – 10 sect.)
