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WD388/0/2004
Chapter 2 : General Instruction
system and burns with
a blue flame just off the
surface of the burner.
As the hot products of
combustion
downwards, they are
cooled by exchanging
heat with the circulating
water which enters the
heat exchanger at the
bottom
of
the
exchanger.
optimum heat input is
detected by monitoring
flow
and
temperatures
adjusted by controlling
the speed of the fan.
The
optimum
speed is also detected
and
automatically
selected by the boiler.
When the return water temperature is below 55
combustion products will condense inside the heat exchanger, thus increasing the boiler
efficiency
further
releasing the latent heat
of
condensation.
condensate falls to the
bottom
of
the
exchanger where it is
separated from the flue
gases and exits from the
boiler
through
condensate
drain.
condensate formed in the
flue runs back down the
flueway and is drained at
the base of
connection to the heat
exchanger or drain points
within the flue.
The condensate is very
slightly acidic (about the
same acidity as vinegar)
and should be piped in a
plastic pipe. It is not
harmful
to
the
disposal system and may
be disposed of as normal
waste water.
The flue gases are piped
in a 50 mm muPVC
(BS5255
BSEN1566-1
BSEN1329)
plastic
alternatively,
Keston composite plastic pipe to outside. The temperature of the flue gases are usually
Installation & Servicing Instructions
pass
heat
The
return
and
is
pump
by
Boiler
This
Schematic
heat
the
Any
the flue
waste
and/or
and
or,
75mm
The Keston C36 Combi & C36P Combi Boilers
o
C, part of the water vapour in the
Page : 5
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