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System inspection and maintenance
Logano G515 – 6 720 647 208 (2014/09) 41
13.4 Wet-cleaning the boiler
When wet-cleaning, pick the cleaning agent based on the level of
contamination.
Proceed with wet cleaning in the same order as described for cleaning
with cleaning brushes ( Chapter 13.3, page 39).
▶ Select a cleaning agent that is appropriate for the type of
contamination (soot or encrustation).
▶ Cover the control panel with foil to prevent penetration by the
cleaning agent.
▶ Spray cleaning agent evenly from the top into the flue gas passages
▶ Heat up the boiler to a boiler water temperature of at least 158 °F
(70 °C).
▶ Brush out the heat exchanger heater.
13.5 Checking the operating pressure
The operating pressure must be at least 15 psi (1 bar).
▶ Read the current operating pressure (psi) and temperature (°F (°C))
from the temperature/pressure gauge.
▶ If the operating pressure drops below 15 psi (1 bar), fill boiler water.
Fig. 77 Pressure/temperature gauge
13.6 Filling with boiler water and purging the system
▶ Slowly fill the heating system via the on-site fill valve. During filling,
observe the display (pressure gauge).
▶ Once the desired operating pressure is reached, stop the procedure.
▶ Purge the air from the heating system via the purge valves on the
heating bodies.
▶ Fill with water again if the operating pressure drops as a result of
purging the system.
For wet-cleaning (chemical cleaning), observe the
operating instructions of the relevant cleaning
equipment and cleaning agent. It may be necessary to
vary the wet-cleaning process from that described here.
NOTICE: Risk of system damage from temperature
stresses.
▶ When the heating system is in operation, do not fill it
via the boiler fill & drain valve. Instead, use the fill
valve on the system side.
Bring the system up to the required operating pressure.
NOTICE: Risk of system damage from frequent refilling.
▶ The system may be damaged, depending on water
quality, by corrosion or scaling, if you frequently
need to re-fill your system with make-up water.
▶ Ensure that your heating system is bled.
▶ Check the heating system for leaks and the function
of the expansion vessel.
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