Radiant RK 25, Instruction Manual

Page: 17 / 60

INSTALLATION INSTRUCTIONS
TA05A140.A0307
13
148 49 182 31
HR G HF
105
HF
G
HR
Ø 22 mm
Ø 15 mm
Ø 22 mm
3.5 Water connections
In order to safeguard the heat
exchanger and circulation pump,
especially in case of boiler replacement,
it is recommended that the system is
hot-flushed to remove any impurities
(especially oil and grease) from the
pipes and radiators.
Make sure that the domestic water and
central heating pipes are not used to
earth the electrical system. The pipes
are totally unsuitable for this purpose.
Isolation Valves must be installed on
the heating and D.H.W circuits. This will
facilitate all maintenance and service
operations where the boiler needs to be
drained.
■ To prevent vibration and noise coming from
the system, do not use pipes of reduced
diameter, short radius elbows or severe
reductions in the cross sections of the
water passages.
■ In order to guarantee the reliability of the
boiler and prevent permanent damage in
areas with high water inlet pressure too,
a 2.5 bar pressure reducing valve should
be fitted.
■ To facilitate the installation, the boiler is
supplied with an hydraulic connection kit
(see fig.2).
Central heating circuit
In order to prevent scaling or deposits in the
primary heat exchanger, the mains supply water
to the heating circuit must be treated according to
the requirements 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 discharge
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 (conforming to UNI EN 677 standard) must be
connected to a proper condensate trap. The condensate discharge into the drainage system is allowed providing a
condensate trap (siphon) is installed.
Any condensate discharge pipe work external to the building (or in an unheated part of it) must be insulated to
protect against frost. Before switching the boiler On, check the correct condensate discharge.
LEGEND
HR
HEATING RETURN Ø3/4”
HF
HEATING FLOW Ø3/4”
G
GAS Ø1/2”
Fig. 2
Fig. 1