Hydraulic System - Beeston Heating ACER 60 Design Manual
Wall-hung condensing premix gas fired boiler 60-180 kw
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Bees ton ACER wall-hung c ondens ing boiler 60-180kW
D ESIGN MANUAL
5.0
Hydraulic system
5.1
Internal pump
5.1.1 The appliance pump is factory set at
maximum speed (3) and should not be
adjusted. The boiler control has a built in
pump overrun timer preset at 3-minutes, that
delays switching off the pump at the end of
the heat demand. The overrun time can be
adjusted via the control panel.
5.1.2 Where connected, the external pump and the
diverter valve / hot water pump are also
activated for one minute every 24 hours. The
24-hour cycle starts as soon as power is
supplied to the appliance.
5.2
System pump
The boiler pump is designed to overcome the
boiler resistance. It is recommended to install
an external pump to suite the hydraulic
system. In some systems, a transfer pump
between the boilers and the low-loss header
(manifold) may be required.
5.3
Water treatment
5.3.1 Prior to filling, systems should be flushed to
remove debris (and sludge from existing
systems) and to ensure that solder flux is not
present
in
the
recommended that an effective air and dirt
separator or filter is fitted for the permanent
protection of the boiler.
5.3.2 It is essential for the correct and lasting
operation of the Acer boilers, in particular the
stainless steel heat exchanger, that suitable
and adequate water treatment is applied to
the hydraulic system, in accordance with the
manufacturer's recommendation to prevent
the build up of scale and corrosion products.
Sentinel X100, available from Betz Dearborn
has been shown to be suitable for this type of
heat exchanger.
However, it is the responsibility of the
installer or contractor to ensure that the
selection of water treatment products
takes account of all of the materials
included in the hydraulic system.
5.4
Pipe-work & system materials
Where the boiler is connected to an under-
floor heating system or any other system
where plastic pipework is utilised, such plastic
pipework must include an oxygen diffusion
barrier to prevent oxygen entering the system
system.
It
is
also
water and thereby causing corrosion within
the system.
If the pipework does not include such a barrier
then the system water must be separated
from the primary water circulating around the
boiler via a plate heat exchanger. Failure to
provide this separation will render the
boiler warranty void.
5.5
Other hydraulic system design
considerations
5.5.1 Suitable safety pressure relief valve or
valves must be installed on the hydraulic
system. Valves of the correct size, type and
relief pressure must be fitted at the point in
the system where the maximum temperature
occurs, usually as close to the flow
connection on the boiler as possible.
5.5.2 Where thermostatic valves are installed in
the
system,
arrangement is required to allow sufficient
flow through the boiler, even when all valves
are closed.
5.5.3 It is necessary to install an expansion vessel
of the correct capacity and pressure setting
to suit the system and the static pressure.
6.0
Flue and ventilation
6.1
Flue system
6.1.1 The
ACER
appliance. The boiler has two connections:
one for the flue gas discharge and the other
for the fresh air supply into the boiler for
combustion. Contamination of the air supply
from external sources must be avoided, with
particular
debris,
flue
chlorides.
6.1.2 The ACER Boiler can be installed with
different flue options.
1- Two pipe system terminating through the
wall or through the roof, one pipe for flue
gas and the other for fresh air intake from
outside.
2- One pipe system for flue gas discharge.
Fresh air is taken from the plant room,
(plant
room
ventilation at high and low level).
P a g e 9
then
a
suitable
boiler
is
a
room
reference
to
dust,
insulation
products,
fluorides
must
have
adequate
bypass
sealed
and
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