Alarko SRS 20, Installation And Operating Instructions Manual

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are often present in the case of a new installation. If the characteristics of the
mains water supply are such that require it to be treated, then the appropriate
treatment devices must be installed, while in the case of residues, an in-line
filter should be sufficient.
All DHW circuits, connections, fittings, etc. should be fully in accordance with
relevant standards and water supply regulations.
Central Heating Circuit
In order to prevent scaling or deposits in the main heta exchanger, the mains
supply water to the Heating circuit must be treated according to the require-
ments of local standards. This treatment is indispensable in the case where the
circuit is frequently topped-up or when the system is often either partially or fully
drained.
The outlet connection of the boiler safety valve must be connected to a dis-
charge trap. The manufacturer will not be held responsible for flooding caused
by the operation of the safety valve in the case of system overpressure.
Condensate Drain
The condensate drain flexible pipe supplied with the boiler is connected to
the siphon. The condensate discharge into the drainage system is allowed by
means of siphon. Condensate drain pipe must be connected to sewage drain
as open connection at boiler side to prevent interruption in flow and as including
U form in pipe to prevent smelling. Diameter of plastic connecting pipe must be
minimum 32 mm (Figure 17).
Figure 17.
Drain Pipe and Connection to
Sewage Drain
Any condensate drain pipe work ex-
ternal to the building (or in an unhe-
ated part of it) must be insulated to
protect against frost. If condensate
water is connected to the rain water
drain pipes, there is a risk of freezing.
Before switching the boiler On, check
the correct condensate drain.
4.6 Appropriate Central Hea-
ting Pipes
For combi boiler not to be affected
from electro cell, plumbing mud and
biocide (green colored bacterium
which originates in water), use of oxy-
gen barrier pipes in accordance with
DIN 4726 (a pipe having oxygen diffu-
sion value lower than 0.1 g/m3.day at
40°C) is highly recommended.