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14
I
t must also be possible to be able to completely isolate the
appliance electrically. Connection should be via a 3 amp
f
used double-pole isolating switch with a contact separation
of at least 3 mm on both poles. Alternatively, a fused 3 Amp.
3
pin plug and unswitched socket may be used, provided it is
not used in a room containing a bath or shower. It should
o
nly supply the appliance.
The boiler is suitable for sealed systems only. The maximum
working pressure for the appliance is 6 bar. All fittings and
pipework connected to the appliance should be of the same
standard. If there is a possibility of the incoming mains
pressure exceeding 6 bar, particularly at night, then a
suitable pressure limiting valve must be fitted.
The boiler is designed to provide Central Heating on demand
t
o a Central Heating system and to heat an Indirect Hot
Water Storage Cylinder.
Flushing and Water Treatment
The boiler is equipped with a stainless steel heat exchanger.
The detailed recommendations for water treatment are given
in BS 7593:1992 (Treatment of water in domestic hot water
central heating systems); the following notes are given for
general guidance;
If the boiler is installed on an existing system, any
unsuitable additives must be removed.
Under no circumstances should the boiler be fired before the
system has been thoroughly flushed; the flushing procedure
must be in line with BS7593:1992.
We highly recommend the use of a flushing detergent
appropriate for the metals used in the circuit. These include
cleansers produced by Fernox and BetzDearborn, whose
function is to dissolve any foreign matter that may be in the
system;
In hard water areas or where large quantities of water are in
the system the treatment of the water to prevent premature
scaling of the main heat exchanger is necessary.
The formation of scale strongly compromises the efficiency of
the thermic exchange because small areas of scale cause a
high increase of the temperature of the metallic walls and
therefore add to the thermal stress of the heat exchanger.
Demineralised water is more aggressive so in this situation it
is necessary to treat the water with an appropriate corrosion
inhibitor.
Any treatment of water by additives in the system for frost
protection or for corrosion inhibition has to be absolutely
suitable for all the metals used in the circuit.
The use of a corrosion inhibitor in the system such as Fernox
MB-1, BetzDeaborn Sentinel X100 or Fernox System
Inhibitor is recommended to prevent corrosion (sludge)
damaging the boiler and system;
If anti-freeze substances are to be used in the system, check
carefully that they are compatible with the metals used in the
circuit.
M
TS suggests the use of suitable anti-freeze products such
as Fernox ALPHI 11, which will prevent rust and incrustation
t
aking place.
P
eriodically check the pH of the water/anti-freeze mixture of
the boiler circuit and replace it when the amount measured is
o
ut of the range stipulated by the manufacturer ( 7 < pH < 8).
DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE
In under-floor systems, the use of plastic pipes without
protection against penetration of oxygen through the walls
can cause corrosion of the systems metal parts
(metal piping, boiler, etc), through the formation of oxides
and bacterial agents.
T
o prevent this problem, it is necessary to use pipes with an
“oxygen-proof barrier”, in accordance with standards DIN
4726/4729
. If pipes of this kind are not used, keep the
system separate by installing heat exchanger
s of those
with a specific system water treatment.
IMPORTANT
Failure to carry out the water treatment procedure will
invalidate the appliance warranty.
Location
The boiler can be installed on any suitable internal wall.
Provision must be made to allow the correct routing of the flue
and siting of the terminal to allow the safe and efficient removal
of the flue products. A compartment or cupboard may be used
provided that it has been purpose-built or modified for the
purpose. It is not necessary to provide permanent ventilation
for cooling purposes. Detailed recommendations are given in
BS 5440 pt 2. If it is proposed that it is installed in a timber
framed building then reference should be made to British Gas
Document DM2, or advice sought from CORGI.
Where a room sealed appliance is installed in a room
containing a bath or shower, the appliance and any
electrical switch or appliance control, utilising mains
electricity should be situated specifically in accordance
with current IEE Wiring Regulations.
For unusual locations, special procedures may be necessary.
BS 6798:2000 gives detailed guidance on this aspect.
Condensate Discharge
The condensate discharge hose from the boiler must have a
continuous fall of 2.5
o
and must be inserted by at least 50mm
into a suitable acid resistant pipe - e.g. plastic waste or
overflow pipe.
The condensate discharge pipe must have a
minimum diameter of 22mm, must have a continuous fall and
preferably be installed and terminated to prevent freezing.
The discharge pipe must be terminated in a suitable position:
i)
Connecting into an internal soil stack (at least 450mm
above the invert of the stack). A trap giving a water seal
of at least 75mm must be incorporated into the pipe run,
there also must be an air break upstream of the trap.
ii) Connecting into the waste system of the building such as
a washing machine or sink trap. The connection must be
upstream of the washing machine/sink. If the connection
is down stream of the waste trap then an additional trap
giving a minimum water seal of 75mm and an air break
must be incorporated in the pipe run, as above.
10. Installation Requirements (continued)