PENSOTTI PCI 18, Instruction Manual

Page: 22 / 70

INSTALLATION INSTRUCTIONS
19
HR
HWO
CWI
HF
3.4 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.
In order to safeguard all waterside
components the supplied Fernox
Commissioning Kit Must be used in its
entirety.
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 water a
pressure reducing valve and backflow preventer
must be installed

To facilitate the installation, the water heater is
supplied with an hydraulic connection kit (see
fig.2).
A pressure relief valve is installed in this dual purpose
water heater that is rated in accordance with and
complying with either The Standard for relief Valves
and Automatic Shutoff Devices for Hot Water Supply
Systems, AINSI Z21.22 or The ANSI/ASME Boiler and
Pressure Vessel Code, Section IV (Heating Boilers).
The relief valve must be installed such that the
discharge will be conducted to a suitable place for
disposal when relief occurs. The discharge line must be
installed to allow complete drainage of both the valve and
the line. If this unit is installed with a separate storage
vessel, the separate vessel must have its own temperature
and pressure relief valve. This valve must also comply with The Standard for Relief Valves and Automatic Shutoff
Devices for Hot Water Supply Systems. AINSI Z21.22 (in the U.S. only). A temperature relief valve is not required but
if one is used, do not install the valve with the probe directly in the flow of water. This may cause unwarranted
discharge of the valve.
LEGEND
HR
HEATING RETURN
Ø 3/4 "
HF HEATING SUPPLY Ø 3/4 "
G
GAS
Ø 1/2 "
CWI COLD WATER INLET
Ø 1/2"
HWO
HOT WATER OUTLET
Ø 1/2"
5.1
HF CWI G
HR
HWO
2.5 3.1 2.7 3.2 4 2.2
Fig. 2
Fig. 1