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,1752'8&7,21
%2,/(523(5$7,21
Combustion air is drawn into the oil burner by the
burner fan through the air intake hose connected to
the coaxial flue/combustion air intake separator
tube assembly. Heated air from combustion of the
oil burner cools as it passes through the boiler heat
exchanger, then the condenser. Cooled flue pro-
ducts exit the unit through the center of the flue/
combustion air separator tube assembly. Conden-
sate from the flue products is drained from the bot-
tom of the condenser into the condensate drain
tube, exiting the unit through the condensate drain
system..
Water is circulated through the boiler heat exchan-
ger and condenser circuits where it is heated by the
combustion of the oil burner. Two independent wa-
ter-heating circuits can be connected to the unit:
• The first circuit passes through a three way
mixing valve incorporated into the boiler. This
valve can either be used manually as supplied
or driven by a regulator (option).
• The second circuit can supply another heating
circuit and/or a domestic hot water production
system.
Circuit heating
return or
2
nd
circuit heating
output
1
st
circuit heating
output