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continue to flow until the faucet is closed
and the boiler automatically shuts down.
Note that the pump will continue to run for
a further 10secs to dissipate the residual
heat from the boiler.
4.4 DOMESTIC HOT WATER AND
CENTRAL HEATING MODE:
When heating demand is required, i.e. the
timer and thermostat are calling for heat,
then providing the power is on the boiler
will fire automatically. An integral pump
is then energised and hot water from the
boilers primary circuit is circulated around
the central heating systems pipe-work and
radiators. When the demand for central
heating is no longer present, either the
thermostat reaches temperature or the time
clock reaches the end of its set period, the
burner will shut down and the boiler will
revert to stand-by, waiting to respond to
the next heating or hot water demand. The
pump will continue to operate for a short
period of time to dissipate any excess heat
09
from within the boiler's heat-exchanger.
If during the heating period there is a call
for hot water this will take preference over
heating.
then supply the heating demand as
required. Note there may be a 45sec delay
depending on how the boilers dipswitches
are set. See section 14.3 for details.
5. General Installation
5.1 Installer Testing & Commissioning
Tips
• The installer shall instruct the user in the
operation of the boiler, safety devices
contained within the boiler and instruction
on how to re-pressurise the system if the
water pressure falls. The installer should
then hand over the instructions and
completed Benchmark Logbook.
• The user should be instructed to keep the
instructions and logbook in a safe place for
servicing and future reference.
When satisfied the boiler will
• It is important to keep the boiler clear of dust
during the installation. In particular, do not
allow debris to enter the top of the boiler where
the flue connection is made. This may cause the
fan outlet to get blocked or combustion
chamber to fill with debris and will, of course,
cause the boiler to fail to ignite on first ignition.
It is recommended that you check the fan outlet
before you light the boiler.
• Before you fit the boiler ensure that the pipe
work that you are installing is connected to the
appropriate connections on the boiler i.e. cold
water pipe to cold water inlet, hot water outlet
to the hot water tap etc.
• Because the boiler is actually operated, at the
end of each production stage, a small amount
of water is retained within the boiler when
packed. Please ensure that you spin the pump
rotor manually before firing the boiler.
• Remember to thoroughly flush the water
circuits in order to remove any fluxes and
debris from them. This should be done
particularly where boilers are being fitted to
existing radiator circuits.
• Refer to BS 7593:1992 for the details to clean
DHW and Central heating system.
• This boiler has been factory set and does not
require any adjustments to the gas valve or
fan speed.
• Remember to release the small cap, 1 turn, on
top of the automatic air vent, located on top of
the pump, before filling. This will ensure that
air is vented from the pump as the system fills.
• Do not use the pressure relief valve as a
means of flushing the system, please use the
valve below the pump. Discharging water from
the system via the pressure relief valve may
leave debris on the valve seat allowing water to
seep after you have left the job. This will cause
the boiler to lose pressure and the boiler to
lockout.
• The boiler is fitted with inlet filters both on the
cold water inlet and the central heating return.
If you are unable to obtain hot water at the
faucet it is likely that the cold water inlet valve
filter has become blocked, whilst blockage of
the filter on central heating return valve will
cause the heater to lock out at the overheat
thermostat as the water flow is reduced.
Page 9
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