Boiler installation
7
23
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Logano G124X II/SP special gas-fired boiler • Issue 04/2005
7.6
Filling heating system and checking for leaks
The boiler is tested for leaks at the factory. Before
placing the heating system tank into use, check it for
soundness to avoid leaks occurring during operation.
Water treatment
Carry out the leak test at 1.5 times the normal operating
pressure and as specified by the local codes as follows:
z
Close connection for relief valve (
page 15) and all other open connections with plugs.
z
Disconnect the expansion tank from the system by
closing the cap valve.
z
Open mixing and stop valves on hot water side.
z
Fill boiler slowly with water from the building
connection.
z
Turn cap of automatic vent one revolution to allow the
air to escape.
z
Slowly fill heating system. Observe pressure display
on pressure gauge during this process.
z
Check connections and pipes for leaks.
z
Bleed heating system through the bleed valves on
the radiators.
z
If the pressure falls while bleeding, water must be
added.
z
Install relief valve (
Fig. 22
Temperature/pressure gauge
USER NOTE
Have the water analyzed before filling the
heating system. The water may require
treatment as a result of the analysis.
Please consult the local water supply
company if the water is extremely hard or
has a pH level below 7.0.
CAUTION!
SYSTEM DAMAGE
due to overpressure during the leak test.
Pressure, control or safety components
may be damaged by high pressure.
z
Before conducting the leak test make
sure that no pressure, control or safety
components that cannot be
disconnected from the water
compartment of the boiler are installed.
Maximum
operating pressure
Maximum
construction site test
pressure
30 psi
(with the included relief
valve)
45 psi
58 psi
(with a different relief
valve)
75 psi
Tab. 6
Test pressures