8
Heating system servicing
Logano GB125 BE US/CA - Technical specifications are subject to change without prior notice.
46
V
Add water through the feed valve.
V
Bleed the heating system.
V
Check the operating pressure again.
8.8
Testing relief valve
The functioning of the safety valve must be checked at
regular intervals (every 1-3 years depending on local reg-
ulations).
V
Make sure that no persons are in the discharge area of
the pressure relief valve.
V
Raise the lever on the pressure relief valve.
The pressure relief valve must open and release pressure.
If the safety valve fails to release excess pressure, it must
be replaced, because otherwise system components may
be damaged by excessive operating pressure.
8.9
Concentric combustion air supply
and flue pipe
V
Check concentric combustion air supply and flue pipe
for dirt and leaks. Measure CO/CO
2
levels in boiler flue
socket using annular gap method.
V
Check that the condensate outlet is not blocked
because, if it is, the condensate may run into the boiler
and cause corrosion.
8.10 Air supply system
V
If the CO
2
/CO levels are too high, check the air supply
system for blockages.
Caution:
Risk of damage to system due to
material stresses caused by temperature dif-
ferentials.
V
Only fill the system when cold (the flow
temperature at the temperature/pressure
gauge should be no more than 100 °F).
