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Filling of the system
STOPPER BLOCKED
LOOSE STOPPER
ONE TURN
Filling must be done slowly in order to allow the air bub-
bles to come out through the appropriate vents placed on
the heating system.
In Thermal systems with closed circulation the loading
pressure with cold boiler and the preloading pressure of
the expansion vessel must be equivalent.
• In Thermal systems with open circulation, it is possi-
ble the direct contact between the circulating liquid and
the air. During the heating season, the user must regularly
check the level of water circulating in the expansion tank.
The content of water in the recirculation system must be
kept constant.
Practical experience shows that a regular check of the
water level should be made every 14 days in order to
maintain a fairly constant water content.
50
In case it is necessary additional water it is necessary to
be made the filling process when the heater is cooled to
room temperature.
These are precautions to prevent the arising of thermal
stress of the steel body of the heating stove.
• In plants equipped with open vessel the water pressure
in the heating stove, (when the system is cold) , must not
be less than 0.3 bar;
• the water used for filling the heating system must be
decontaminated and without air.
It can damage the seals and cause the occurrence
of noise during operation. The manufacturer
declines all responsibilities if damage caused
to people, animals or property caused if above
instructions are not followed.
When all the hydraulic connections are done, proceed to
test the pressure of the seals, through the filling of the
heating stove.
VENTING
SAFETY
The loading valve is necessary and must be provided
VALVE
in the hydraulic system.
This operation must be done with caution, respecting the
following steps:
• open the air vent valves, the heater and the plant;
• open gradually the system filler tap, checking that all
automatic purging air valves installed, are operating prop-
erly;
• close the radiators venting valves as soon as water
flows;
• check on the manometer placed on the system that the
pressure reaches about 1 bar (applies only to systems
with a closed vessel, to consult any local regulations or
standards that allows it); for open vessel, the reintegration
is automatic through the vessel itself;
• close the system filler cock and again release the air
through the vent valves of the radiators;
Do not mix the heating water with
antifreeze or corrosion substances in the
wrong concentrations.
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