22
18.03. 5719210_03
ANL / 290-650
EN
14. SYSTEM CHARGING
Before commencing the charging procedure position
the main isolator of the unit in the OFF position.
1.
Ensure that the system drain valve is closed
2.
Open all the system air vents and of the terminal
units
3.
Open the system isolating valves
4. Start filling slowly opening the system water
charging valve external to the unit
5.
When water exits the terminal units air vents
close them and continue charging until the
required system operating pressure is reached.
14.2. SYSTEM DRAINING
1.
Before commencing draining the draining proce-
dure position the main isolator of the unit in the
OFF position
2.
Ensure the system water charging valve is closed
3.
Open the system drain valve external to the unit
and all the system air vents and of the terminal
units.
14.5. UNIT DRAINING
WARNING
During the winter period the water in the heat
exchanger may freeze when the system is off, causing
irreversible damage to the heat exchanger.
There are three solutions to avoid the risk of freezing
1.
Complete draining of water from the unit.
2.
Operating with glycol, with a percentage of glycol
selected in accordance with the minimum antici-
pated external temperature.
3.
Use of electric heaters.
In such cases the electric heaters must always have
power available for the whole period of possible
freezing (unit in stand-by)
WARNING
Confirm the hydraulic integrity of
the joints.
WARNING
It is recommended to repeat
this procedure after the unit has
operated for a few hours and to
periodically check the system pres-
sure. Charging to be done with unit
off (pump OFF).
WARNING
If the system contains and anti-
freeze this must not be discharged
to the drains as the liquid may be
a pollutant.
It must be recovered and recy-
cled.
Summary of Contents for Variable Multi Flow ANL 290
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