Keston Qudos 28s User, Installation And Servicing Instructions page 11

WD420/3/2007 Chapter 2 : General Instruction
bottom of the heat exchanger where it is separated from the flue gases and exits from the
boiler through the condensate drain. Any condensate formed in the flue runs back down
the flueway and is drained at the base of the flue 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 waste disposal system and may be disposed
of as normal waste water.
The flue gases are piped in a 50 mm muPVC (BS5255 and/or and BSEN1329) plastic or,
alternatively, 75mm Keston composite plastic pipe to outside. The temperature of the flue
gases are usually around 5
pipe should be terminated outside the building from where they cannot re-enter the
building or any other adjacent building. It should also be terminated such that flue
products cannot be drawn into the boiler air intake terminal.
The heating level may be controlled by room thermostats, programmer time clocks and
compatible energy management systems. An optional Keston room controller can be
connected which will provide enhanced controls such as room compensation to further
increase efficiency and comfort levels. However, this is only recommended for heating
only applications. Once the controls are set the boiler operates automatically. Further, a
Keston outside sensor can be connected to the boiler which will automatically invoke
weather compensated heating which further boosts user comfort and boiler efficiency.
In the event of the
boiler overheating the
safety devices
cause a
shutdown.
discharge valve and
discharge pipe is fitted
to the boiler.
The Qudos
features an integral
frost
function which
operate the
regardless
external
should the
temperature fall below
o
10 C. In the event the
boiler temperature
falls below 5
boiler will also fire.
This is
damage to the boiler
through freezing
boiler water.
boiler will
when the
temperature exceeds
o
15 C.
The Qudos
features an integral
pump
function which will run
the pump,
Installation & Servicing Instructions
o C to 10
will
safety
A safety
28s
protection
will
pump,
of the
controls,
boiler
o
C the
to avoid
of
The
turn off
flow
28s
exercise
without
The Keston Qudos 28s & Qudos 28sP Boilers
o C above the temperature of the return water. The flue
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