Protherm Tiger 24 (12) KTZ Operating And Installation Manual - Distribution Pipes
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Distribution pipes
Nominal pipe inside diameter is chosen in
the usual way based on the pump chara-
cteristic. Distribution pipes are designed
according to the requirements on system
performance, not according to the boiler’s
maximum output. The system must allow
sufficient flow so that the temperature diff-
erence between the supply and the return
pipe is smaller than or equal to 20 °C. Mi-
nimum flow must be 500 l/h.
The piping system must be constructed
to prevent air bubbles from developing,
making permanent bleeding of the system
easier. Vents should be situated on all high
points of the system and on all radiators.
It is recommended to install a system of
heating water, domestic hot water and gas
shutting valves.
We recommend that you install on the
lowest point of the heating system a drai-
nage valve which will also dub as a hea-
ting system top-up valve.
Important:
If the boiler is connected to a
floor heating system, a fitting must be in-
stalled downstream of the boiler outlet to
prevent heating water of an unacceptable
temperature from entering the system.
The setting of the safety fitting depends
on the properties of the used piping.
Before final installation of the boiler, the
heating distribution system pipes must be
flushed a few times with pressurised wa-
ter. In old, already used systems, the flu-
shing must be done in opposite direction
to the heating water flow.
Important:
Prior to connecting the boiler
to the heating system remove all plastic
plugs from outlet necks.
Heating system cleanliness
Before installing a new boiler, it is es-
sential to clean the system thoroughly. In
old systems it is necessary to remove all
sludge settled at the bottom of the heating
radiators (particularly in gravity systems).
In new systems it is necessary to remove
all conservation material which the majo-
rity of radiator manufacturers use.
It is recommended to install upstream
the boiler (i.e. to the HeW return pipe) a
sludge trap. The sludge trap should be de-
signed in such a way that it is easy to em-
pty in regular time intervals without having
to drain a lot of water from the heating
system. The trap can be combined with a
filter, but a filter with a sieve on its own will
not provide sufficient protection. The filter
and the sludge trap must be checked and
cleaned regularly.
HeW circulation in the system
Although the boiler is equipped with a by-
pass, we recommend to design the hea-
ting system so that the heating water can
flow through at least some of the radiators
all the time.
Using antifreeze
We do not recommend to use antifreeze,
because of their unsuitable properties for
the boiler. It is mainly their reduced heat
transfer, large volume expansion, aging
and damage of rubber parts.
In necessary cases it is permitted to use
antifreeze Alicol Termo (produced by
Slovnaft Bratislava) – according to the
producer’s experience use of this antif-
reeze cannot lead to reduced safety and
influence on boiler operation. If even this
method of preventing heating system fre-
ezing cannot be used, non-performance
by the boiler and potential boiler damage
due to use of other antifreeze agents can-
not be covered by the warranty.