red
PRACTIKA 28-33
USE AND INSTALLATION MANUAL
Chapter 5
page 29
System installation procedure
Technical dept. - All rights reserved - Reproduction prohibited
out every fortnight to keep the water content almost constant. If more water is required, perform
the filling process, when the boiler has cooled down to room temperature. These precautions are
designed to prevent the occurrence of heat stress on the steel body of the boiler.
In systems equipped with an open vessel, the water pressure in the boiler (when the system is cold)
must not drop below 0.3 bar;
The water used to fill the heating system must be purified and not contain any air.
Caution!
Do not mix the heating water with anti-freeze or anti-corrosion products
in the wrong concentrations! This could damage the seals and cause noisy
operation.
RED will not be held liable for any damage to persons, animals or property
caused by failure to observe the above instructions.
Once all the hydraulic connections have been made, check the seals under pressure by filling
the boiler.
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;
N.B.
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.
