Working pressure
10 bar
Pipe of sensor L=142 mm, external thread ½“
ATTENTION !
The system of the emergency cooling of the boiler can not be used for the
heating of water
.
Description of the principal scheme of the boiler room.
When the water temperature in
the boiler reaches
60
0
C there is launched circulation pump connected with the boiler. Water circulates
through the thermostatic mixing valve in the cycle „boiler – thermostatic mixing valve – boiler“.
Heating system is equipped with the programmed automatic control processor and 3-way mixing valve
with electric drive (if the heating system is not equiped with the programmed automatic control
processor and 3-way mixing valve with electric drive there can be installed manual operation 3-way
mixing valve and to perform the regulation of heating system in manual way). When the water
temperature rises further the programmed processor control and regulate the temperature of the water
supplied from the accumulation tank to the heating system. This temperature depends very much on
the outside and ambient temperatures measured with the sensor.
In order to avoid the corrosion of boiler caused by the water condensate in the temperatures below
55
0
C thermostatic mixing valve automatically ensures that the minimal temperature of water returning
to the heating boiler is 60
0
C.
Installing the boiler, the following requirements should be fulfilled:
The boiler should be installed in a closed heating system with a closed (membranous)
expansion vessel, the volume of which should be no less than 10% of the total volume
of a heating system (including the boiler). The closed heating system is the system with
no free access to atmospheric air, which actuates corrosion. Due to this, it is restricted
to drain water from the system without a particular reason (e.g. in summer, etc.). It is
also necessary to ensure tightness of the system in order to need fewer refills with
fresh water having free oxygen. Quantity of the additional water should not exceed 5%
of water volume of the system per year. If an open expansion vessel is installed at the
highest point of the heating system, it should be disconnected from the system and an
automatic air escaper installed instead as well as a closed expansion vessel at the
boiler (see fig. 4).
There must be no shut-off valves between the boiler and safety valve.
The technical characteristics of the safety valve:
Instrument
Technical characteristics
Type of boiler
Safety valve
Connection diameter does
not exceed ½”, opening
pressure 2 bar
Astra G-18, Astra G-25,
Safety valve
Connection diameter does
not exceed 3/4”, opening
pressure 3 bar
Astra G-31,5, Astra G-40,
Astra G-50, Astra G-80,
Astra G-100,
Temperature – pressure
gauge
Range of pressure 0-4 bar
Temperature 0-120°C
All the boilers
Water from the safety valve should be conducted via an offtake duct. It should be
conducted in the way that the water let by the valve would safely flow, avoiding exposure with people
and electrical parts of the boiler. The diameter of the offtake duct should be no less than the diameter of
the offtake opening connection branch of the safety valve. Total length of the offtake duct should not
exceed 2 metres. Installing this duct, no more than 2 elbow joints at 90
0
angles should be used. No
closed, adjustable or other reinforcements should be installed in the valve water offtake duct. This duct
should be installed in the way to see the offtake flow of the water. If the end of the duct is to be hidden
(e.g. in the sewerage pipe), then this duct should have a special funnel enabling to see the offtake flow
of the water.
WARNING!
Operation of the safety valve should be checked at least once per month. The
valve is opened for a while by turning its head to see a small quantity of the offtake water. Avoiding this,
due to a high temperature impact, the components of the valve may stick together and serious
damages of the boiler and the heating system may occur as well as danger arise for human health and
life.
The temperature of the returning water from the heating system to the boiler should be
no less than 60
°
C. This is the only way to prevent the walls of the boiler combustion
chambers from weeping, and the boiler will be protected from corrosion. To ensure the
temperature of the returning water to the boiler and to regulate water temperature of
Содержание G-100 MES
Страница 12: ......
