21
2.8
Equipment for surplus heat withdrawal
The two way safety vent DBV 1 - 02 serves for surplus heat removal in case the water temperature in boiler
exceeds 95 °C.
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.
The two way safety vent DBV 1 – 02 technical data (from the firm Regulus)
Opening temperature (limit):
100 °C (+0° - 5 °C)
Maximum temperature:
120 °C
Maximum stress on boiler side
400 kPa (4 bar)
Maximum stress on water side
600 kPa (6 bar)
Nominal flow at
p 100 kPa (1 bar):
1,9 m
3
/h
Usage
The two way safety vent DBV 1 – 02 is used as a protection of heating boilers against overheating. In the valve
body there is the bleed and supply valve controlled by thermostatic element. When the limit temperature is
reached, the bleed and supply valve is simultaneously opened meaning that the cold water is running in and the
hot water is running out. When the temperature drops below limit, the bleed and supply valve is simultaneously
closed.
Caution! It is not a compensation for safety valve.
In case of two way safety vent reaction, when there is a possibility of boiler having been filled with the
water, which does not meet the
Č
SN 077401 requirements it is necessary to change the water in the
heating system so that it meets the
Č
SN 077401 requirements again.
Fig.
№
. 15 The two way safety vent DBV 1 - 02
It is necessary to install a safety valve for maximum overpressure of 400 kPa (4 bar) on the system and its
dimension must correspond to the rated boiler output. The safety valve must be located directly behind the
boiler. Any stop valve must not be located between the safety valve and boiler. If you have any questions,
please contact our contractual assembly firm and service organizations.
Installation
Installation can be only carried out by a qualified person. For the correct operation of the thermostatic, two ways
safety vent it is necessary to comply with the conditions for its installation and keep the flow directions marking on
its body. The safety vent is always mounted in the output pipe of boiler or directly on the upper part of boiler, where
the hot water leaves boiler and is transported into heating system. When installing the vent it is necessary to check,
if the 3/4“ socket usage, which can be both in pipeline and on boiler, ensures complete immersion of the
thermostatic vent element after the vent installation. After the vent has been installed in socket, connect the down
pipe, in which the hot water from boiler will flow to drain, to „C“(see. fig. no. 15). The cooling water inlet, which will
cool the boiler after setting the vent in operation, is connected (see fig. no. 16) to „A“ (see fig. no. 15). The filter for
mechanical impurities must be installed in the cooling water inlet. It is necessary to connect the pipeline to „B“ (see.
fig. no. 15) and the pipeline is to be led into reverse flow pipe of heating system near the boiler (see fig. no. 16).
A – cold water inlet
B – output to boiler
C – output to drain
D – input from boiler
