Astra G-40 MES Manuel d'installation et d'exploitation - Page 4

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Working pressure

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

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

C thermostatic mixing valve automatically ensures that the minimal temperature of water returning

to the heating boiler is 60

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

Safety valve

Temperature – pressure

gauge

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

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

C there is launched circulation pump connected with the boiler. Water circulates

Technical characteristics

Connection diameter does

not

pressure 2 bar

Connection diameter does

not exceed 3/4", opening

pressure 3 bar

Range of pressure 0-4 bar

Temperature 0-120°C

10 bar

exceed

½",

opening

Type of boiler

Astra G-18, Astra G-25,

Astra G-31,5, Astra G-40,

Astra G-50, Astra G-80,

Astra G-100,

All the boilers

angles should be used. No