14
SFK 28 - RAD - ING - Manuale - 1801.1_V3
1 All
a
c
c
iamento idr
a
ulic
o
_
s
c
al
dab
agno
_
E
N
1. INSTALLATION
INST
ALLER
1.1.9. HYDRAULIC CONNECTION
DANGER
Make sure that the tubes of the water and
heating plant are not used as grounding system for
the electrical plant. There are not suitable for such
use.
WARNING
To prevent voiding the warranty and to
ensure the proper operation of the water heater,
please wash the plant (if possible when hot) with
suitable pickling or descaling solutions in order
to remove the impurities coming from tubes and
radiators.
WARNING
If the water heater is installed in a
hydrostatic position lower than those of the user
devices (radiators, fan coils, etc.), mount the shut-off
valves on the domestic water heating circuit to ease
the performance of the maintenance operations if it
is necessary only to empty the water heater.
WARNING
When connecting the equipment to
water supply, avoid excessive bending and recovery
operations from any off axis positioning that may
damage the tubes causing leaks, malfunction or
early wear.
WARNING
In order to avoid any vibrations and noises,
do not use tubes with small diameters or elbows with
small radius and significant cut-off of the passage
sections.
WARNING
Connect the water heater safety drains
to a discharge funnel. The manufacturer is not
responsible for any floods due to safety valve opening
in case of plant overpressure.
In order to prevent limestone build-up and
damages to the domestic water heat exchanger,
the hardness of the domestic supply water
should not exceed 15 °f. However, please check
the characteristics of the water used and install
suitable treating devices.
The heat exchanger coil cleaning frequency
depends on the hardness of the supply water and on
the presence of solid residues or impurities inside
the water that are often present in case of recently
installed plants. Based on the characteristics of
the infeed water, you should install suitable water
treating devices, for residues presence please
install a line filter.
The pressure of the cold infeed water should be
between 0.5 and 6 bar. In case of greater pressure
values, please install a pressure reducer upstream
from the water heater.
