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Installation info
2.2.13 - HYDRAULIC CONNECTION
Before installing the boiler we recommend that
the system be cleaned to remove any impuri-
ties which could originate from components
and which could risk damaging the circulating
pump and heat exchanger.
Note: The use of solvents could damage
the components of the heating cir-
cuit.
Basing on the feeding water
hardness, it has to be
considered the opportunity to
install appropriate devices for
POSITION
By-Pass
CLOSE
POSITION
By-Pass
OPEN
ADJUST
By-Pass
By-Pass ADJUSTMENT
SCREW CTN 24 - CTFS 24
fig. 24
INSTALLATION WITH BENDED PIPES
(00361193 kit pipes)
INSTALLATION WITH VALVES
(00360682 + 00361193)
INSTALLATION OF BEBDED PIPES AND PRESSURE FITTING 00361265
OPTIONAL CONNECTION KITS
water treatment (for domestic use).
With feeding water hardness higher than 14°f
it’s always recommended the water treat-
ment.
2.2.12 - CONNECTION TO THE GAS
MAINS
The supply pipe must have a section which is
the same as or greater than the one used in
the boiler.
Comply with the applicable local installation
requirements which shall be considered as
having been incorporated in full in this ma-
nual.
Before opening the internal gas supply system;
i.e. before connecting the gas meter, all seals
must be checked.
If any part of the system is concealed the seals
must be checked before the pipes are cove-
red.
The seal test must be conducted using air or
nitrogen at a pressure of at least 100 mbar.
The commissioning of the boiler also inclu-
des the following operations and checks:
- Opening of the gas gate valve and venting
of the air contained in the piping and ap-
pliances, proceding appliance by
appliance.
- Check, with the gate valve of all the ap-
pliances Off, that there are no gas leaks.
During the 2
nd
quarter of a hour from the
beginning of the test no pressure reduc-
tion is to be detected on the gas pressure
gauge. If gas leaks have to be found, use
only water soap solution or any other spe-
cific gas leak detector which can be avai-
lable on the market. Never look for gas
leaks using a naked flame.
While connecting gas inlet pipe of the boiler to the pipe coming from
gas network, it is MANDATORY to insert a TIGHT GASKET, whose
dimensions and material must be adequate. Connection is NOT sui-
table for hemp, teflon strip or similar materials
HEATING
The heating flow and return must be con-
nected to the relevant ¾” connections of the
boiler M and R (see fig. 9).
When determining the size of the heating
circuit pipes it is essential to bear in mind the
pressure losses induced by radiators, any
thermostatic valves, radiator cut-off valves
and the configuration of the system.
In the boiler, onto a brass group, positioned
between the flow and return, an automatic
by-pass device is fitted (a differential valve
with a flow rate of about 150 l/h) which gua-
rantees always minimum flow rate through
the heat exchanger, also in the case, for
instance, that all the thermostatic valves fit-
ted on the radiators, are closed.
On boilers model: RTN 24 – CTN 24 F – RTFS
24 – CTFS 24 F the by-pass is automatic
and pre-adjusted.
On boilers model CTN 24 – CTFS 24 is pos-
sible to adjust the by-pass by acting onto
the adjusting screw
We recommend that the discharge of the
safety valve mounted in the boiler be con-
veyed into the sewer.
If this precaution is not taken, activation of
the safety valve may result in flooding of the
room where the boiler is installed.
UNICAL shall not be held responsible for
damage caused by non-observance of this
technical precaution.
D.H.W.
Inlet and outlet of D.H.W. must be connected
to the relevant ½” connections of the boiler
F and C (see fig. 9).
The hardness of the supply water affects
the frequency of the cleaning of the heat
exchanger.
For the lower connections po-
sitioning, see the mounting jig
of figure 9
24


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