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5 - INSTALLATION - Mounting & gas and water connections
5.8 - Supply and
return piping
CAUTION!!! All heating
system piping must be installed in
accordance with the ANSI/ASME
Boiler and Pressure Vessel Code,
Section IV. All applicable local
codes and ordinances must also
be followed. If the boiler is installed
above any radiation elements it
must be fi tted with a low water
cutoff device installed above the
normal boiler water level! Failure
to do this can result in damage the
unit and void the warranty!
CAUTION!!! This boiler must
have adequate water fl owing
through it whenever the burner is
on. Failure to do this will damage
the unit and void the warranty!
CAUTION!!! Before
connecting the boiler to the heating
system the heating system must
be thoroughly fl ushed to remove
sediment, fl ux, fi lings and other
foreign matter. An approved
inhibitor should be added to the
heating system water to prevent
limestone and magnetite deposits
from forming and to protect the
boiler from galvanic corrosion.
CAUTION!!! This boiler is
equipped with an ASME safety
relief valve set at 30 psi (2 bar). The
heating system must be designed
so that no piping or radiation
elements are higher than 65 ft (20
m) or else the hydraulic head of the
system will cause the relief valve to
open.
CAUTION!!! The
manufacturer cannot be held
responsible for any damage caused
by incorrect use of additives in the
heating system.
CAUTION!!! This boiler
can supply heating water at a
temperature up to 190°F (88°C).
If the heating system is built with
materials not able to resist to this
temperature, you must to install a
device that shut-off the boiler before
the material's limit temperature.
Figure 9 illustrates the position of
the supply and return pipes.
Install a metallic mesh fi lter on the
return pipe to prevent any residue
from the system returning to the
boiler.
Do not use the appliance for
adding any type of additive to the
system.
5.8.1 - Converting a
combi boiler into a
heating only boiler
If you are in possession of a PC160
boiler you can use it as a heating
system only without using the
domestic hot water circuit. To do so,
simply plug the two fi ttings, items
"3" and "5" of fi gure 7, and move
switch No. 5 (see fi gure 18) from OFF
position to ON position. Now knob
"32" of fi gure 1 is disabled.
5.9 - Low
temperature
heating systems
CAUTION!!! When the boiler
is installed in a low temperature
system, the switch No. 6 in fi gure
18 must be placed in the ON
position to prevent the supply
water temperature from exceeding
113°F (45°C) or damage to the low
temperature system components
could occur (see section 5.8).
With switch No. 6 in fi gure 18, in the
ON position, the boiler will maintain
the supply water temperature between
68°F (20°C) and 113°F (45°C). No
setting changes made from the control
panel will cause the supply water
temperature to exceed 113°F (45°C).
CAUTION!!! To protect the
fl oor panel against over heating
you must to install a safety device
that shut-off the boiler before
it reach the fl oor panel's limit
temperature.
CAUTION!!! If the boiler
is installed in a radiant panel
heating system using plastic
18
piping, precautions must be taken
against corrosion caused by water
oxygenation. If the piping does
not incorporate an oxygen barrier,
the radiant panel circuit must be
isolated from the boiler using a
titanium plate heat exchanger.
5.10 - Use of
glycol and other
chemicals
WARNING!!! Never use non-
approved additives or toxic boiler
treatment chemicals in the heating
system as they can cause serious
health problems or possibly death.
Any additives introduced into the
heating system must be recognized
as safe by the United States Food
and Drug Administration.
If glycol is used, it must be used in
accordance with the instructions
supplied with the product.
CAUTION!!! Any additives
added to the heating system must
not be added directly inside the
boiler but through the heating
system piping to prevent damage
to the boiler.
5.11 - Domestic hot
and cold water
CAUTION!!! If the water
hardness is greater than 9 gr/gal
(150 mg/l) we recommend installing
a water softener with fi lter.
Figure 9 illustrates the positioning
of the domestic hot and cold water
pipes.
For servicing purposes, install an
isolation valve upstream from the
cold water inlet.
To correctly set the domestic water
fl ow, install an adjustable fl ow
restrictor upstream the cold water
inlet (see fi gure 13 item "12")
The PC160 boiler can also be
used as heating only boilers.
No connection is needed to the
domestic pipes "B" and "D" of
fi gure 9.
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