Water Connections - PENSOTTI PCC 34-H Instruction Manual

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 boiler and

prevent permanent damage in areas with high
water inlet pressure too, a 36.3 psi (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).
A pressure relief valve is installed in this dual purpose
boiler 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.
INSTALLATION INSTRUCTIONS
1.9
HR
Fig. 1
HWO
HR
Fig. 2
LEGEND
HR
HF
G
CWI
HWO
3.1 2.7 3.2
HWO G CWI
HF
CWI
HEATING RETURN
HEATING SUPPLY
GAS
COLD WATER INLET
HOT WATER OUTLET
4 1.2
HF
Ø 3/4"
Ø 3/4"
Ø 1/2"
Ø 1/2"
Ø 1/2"
19