Trinox Floor Standing Shell and Tube Boiler
13 L344
©
Elco UK 04/07/2012
THE PROBLEM OF CONDENSATE
The water vapour contained in the fumes discharged from the boiler condenses when the
temperature of the water returning to the boiler is below 50°C. Condensation occurs in particular
when the boiler comes on in the morning after being switched off during the night.
The condensation is acid and corrosive and will gradually attack the boiler sheet metal panels.
To limit the formation of condensate as far as possible an anti-condensate pump must be fitted
following the diagram illustrated below.
When the burner starts, a thermostat positioned on the water return to the boiler and set to 55°C
with exchange contact will start up the anti -condensate pump which will continue to operate until
the set temperature is reac hed; the thermostat will then simultaneously switch off the anti -
condensate pump and switch on the system pumps.
In order to totally eliminate the problem, the above circuit must be correctly adjusted in order to
maintain the boiler constantly at 55°C ev en at night and a further temperature -limiting thermostat
must be added to prevent the system mixing valve from sending water below 55°C to the boiler.
This will ensure long life of the boiler.
The flow rate of the anti-condensate pump is normally 25% -30% of the system pump flow rate
whereas the head required is not particularly high as it only has to overcome the resistance of the
boiler and the valves.
The smokebox of the TRINOx is provided with a fitting for discharge of any condensation that forms
during the start-up phase.
Do not connect the fitting directly to the mains drainage system but to a collecting basin in order to
monitor condensation.
