Manual Unical EVE 05 CTN 24 F (page 24 of 36) (English)

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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

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

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

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Unical EVE 05 CTN 24 F Manual

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