Dunkirk 90-100, Installation, Operation & Maintenance Manual, Page: 4 / 56

4
inTroduCTion
figure 1 - boiler dimensions
This appliance is a gas-fired direct vent hot water boiler with cast
aluminum boiler sections. A revolutionary cast aluminum heat
exchanger means better heat transfer and thermal storage than
similarly sized cast iron boilers, which results in higher efficiency.
The heating system water absorbs large amounts of heat from the
cast aluminum heat exchanger, cooling the flue gases and causing
condensation. Sealed combustion, premix gas burner, and low flame
temperature means drastically reduced CO and NOx emissions,
which contribute to a cleaner and healthier environment.
This appliance, unlike normal residential atmospheric and induced
draft units, takes its combustion air directly from the outdoors
(sealed combustion) and does not compete with building occupants
for fresh air. Sealed combustion (also known as “direct vent”) is the
safest and best way to obtain plenty of clean combustion air. The
induced draft fan draws in the outside combustion air, then takes the
cooler flue gases from the boiler unit and provides a positive removal
of the flue gases from the building through inexpensive and readily
available PVC and CPVC pipes.
NOTICE
IMPORTANT: Read the following instructions
cOMPLeTeLY before installing!