Table of Contents
Advertisement
Fig. №. 7
Recommended Wiring Diagram of the DBV 1 - 02 Two-Way Safety Valve
Installation
Only qualified person may perform installation. To ensure correction functionality of the thermostatic two-way safety valve, it is necessary to
follow prescribed conditions for its installation and respect marking of the flow rate directions marked on the valve body. The safety valve is
always mounted into the output pipeline of the boiler or directly on the boiler in a place of its upper part, where heated water leaves the boiler
and is conveyed into the heating system. While installing the valve, it is necessary to check whether the use of the 3/4" mouthpiece (which can
be either in the pipeline or on the boiler) ensures full submersion of the thermostatic module of the valve. After having mounted into the
mouthpiece, connect the draining pipeline in the place „C" (Fig. No. 6) in which hot water will outflow from the boiler. In the place „A" (Fig. No. 6),
connect (according to Fig. No. 7) the cooling water supply line which - after putting the valve into operation - will ensure boiler cooling-down. It is
necessary to install a filter for capturing mechanical impurities on the cooling water supply line. In the place „B" (Fig. No. 6), connect the pipeline
and - according to Fig. No. 7 - lead it into the return line of the system near the boiler.
Regular Maintenance
Once a year rotate the head of the safety valve to remove possible impurities deposited in it. Clean-up the filter on the cooling water input.
In the case of the use of an opened expansion tank, there is no need in a safety device against overheating.
Each heat source in the opened heating system has to be connected with an opened expansion tank which is situated in the highest point of the
heating system. Expansion tanks have to be dimensioned so that they can cover changes of the water volume which occurred as a result of
heating and cooling.
Opened expansion tanks have to be equipped with non-lockable de-aerating and overflow pipelines. The overflow pipeline has to be proposed
so that it reliably lead away the highest supply rate incoming into the system. It can be achieved by dimensioning of the overflow pipeline by one
DN higher than the feeding pipeline has. The expansion tanks and their connecting pipelines have to be designed and placed in order to reliably
avoid their freezing.
Fig. №. 8
Examples of connection of opened expansion tanks
3.4
Heat Removal Device - Accumulating Tanks
Boilers of VIADRUS U22 Economy series meet conditions of the emission class 5 according to EN-305. They match the requirements of this
class while being operated with the nominal power.
If the nominal power is higher than the immediate request of the facility for heating, it is necessary to exhaust the excessive heat into the
accumulating tank.
If the tank is fully charged, it is necessary to shut down the boiler and heat up with heat from the accumulating tank. After the heat in the tank is
spent, put the boiler into operation again. The accumulating tank enables you to ensure thermal comfort and at the same time a quality
operation of the boiler.
Calculation of the smallest volume of the tank heat-exchanger.
where:
V
accumulation tank volume in l
sp
Q
nominal heating power in kW
N
T
combustion time in hours
b
Dimensions of the accumulating tank must be determined according to the boiler power and used fuel. It is necessary to consider the highest
calculated volume, whereas the minimal used volume of the accumulating tank has to be 300 l.
The hydraulic scheme of connection of the boilers with the accumulating tanks are available in the project supporting documents of Viadrus,
at http://www.viadrus.cz/projekcni-podklady-76.html.
1.
2.
3.
4.
5.
6.
7.
8.
V
= 15T
x Q
(1-0,3 x (Q
/Q
sp
b
N
H
Q
H
Q
min
8
1.
Boiler
2.
DBV 1 - 02 Two-Way Safety
Valve
3.
Safety valve
4.
Pressure control valve
5.
Filter
6.
Ball-valve
7.
Pump
8.
Excessive heat removal
9.
Discharge valve
I. – Cooling water input
II. – Heating water output
III. – Return water input
Heat source
Expansion tank
Safety pipeline
Expansion pipeline
Overflow pipeline
Feeding pipeline
Water lever limiter
Return pipeline
))
min
thermal load of buildings in kW
smallest heating power in kW
Hide quick links:
Advertisement
Table of Contents
