RED Compact 24 Use And Installation Manual page 25

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This should be done carefully, in the following sequence:
 open the air relief valves on the radiators, boiler and system;
 gradually open the system filler cock, making sure any automatic air relief valves fitted on the system are
working properly;
 close the air relief valves on the radiators as soon as water starts to trickle out;

check on the system pressure gauge that the pressure reaches a value of approximately 1 bar (this only
applies for systems with a closed vessel - consult any local regulations or standards that allow it); for
systems featuring an open vessel, the reintegration is automatic through the vessel itself;
 close the system filler cock and then vent any air again through the radiator air relief valves;
 check the seal on all connections;
 after starting the boiler up for the first time and the system is at the right temperature, stop the pump
operation and repeat the air venting operations;
 allow the system to cool down and, if necessary, return the water pressure to 1 bar (this only applies for
systems with a closed vessel - consult any local regulations or standards that allow it); for systems
featuring an open vessel, the reintegration is automatic through the vessel itself;
NOTE
In systems with a closed vessel, where permitted, the water pressure in the heating
system - when the system is cold - should not drop below 1 bar; if it does, open the
system filler cock. This should be done with the system cold.
The pressure gauge in the system allows you to read the pressure in the circuit.
In order to fill the system, the boiler is fitted with a tap (4), with a non-return valve, to fill the heating system
manually.
During this operation, the venting of any air inside the system is guaranteed by the automatic vent at the top of
the boiler body.
To ensure the valve vents, it is advisable to loosen the grey cap by one revolution and leave the red cap locked
(see figure)
The system filling pressure WHEN COLD must be 1 bar.
When filling is complete, always turn the tap off.
Hydraulic and electrical connection
COMPACT 24 BOILER
USE AND MAINTENANCE MANUAL
Red cap locked
Grey cap loosened
by 1 turn
Venting valve
Technical dept. - All rights reserved - Reproduction prohibited
Chapter
6
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