Unical RTN 24 Installation, Use And Maintenance Manual Download Page 33

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Service info

ting request. If at the same time
there is a request for domestic hot
water the lamp switches off.

Burner ON lamp (Green) (F)

When this lamp is illuminated it
indicates that the burner is on,
both for central heating or for do-
mestic hot water production.

Burner lockout warning lamp
(G)

The function of this lamp is to si-
gnal that the burner’s control is in
lockout position, due to

lack of gas or

H.L. thermostat cut-out due to an
over-heating of the boiler (95°)

In the first case, if the burner does
not fire, it will be necessary to
verify if the gas gate valve is
open.

In the second case due to a lack
of circulation or to an excessive
scaling deposit in the heat
exchanger the H.L. thermostat
could shut down the boiler at 95°C.

Reset Button (L)

In the first case, which we pre-
viously described, in order to reli-
ght the boiler it will be necessary
to press the button

(L)

using a nail

or something like that.
In the second case, before pres-
sing the button

(L)

, it will be ne-

cessary to wait for the tempera-

D.H.W. temperature control
(C) + No Frost (Only for IVEN
RTN / RTFS when combined
with an external D.H.W. tank)

If the knob is set within the
range indicated by the arrow
on the illustration it means is
possibile to adjust the D.H.W.
temperature from a minimum
of 25°C to a maximum of
57°C.

The reference to the knob in
the position points out that the
boiler's sanitary circuit is not
in operation (in that case the-
re is no production D.H.W.). If
in the mean time the B knob
is in the position the anti-
freeze protection of an exter-
nal D.H.W. tank is activated.

Note: for IVEN RTN/RTFS
when a D.H.W. storage tank
is not fitted, the knob (C)
must be positioned and
must stay onto the
symbol

Power ON lamp (Green) (D)

When this lamp is illumina-
ted it indicates that the boiler
is connected to the mains sup-
ply.

CH request lamp (Green) (E)

If this lamp is illuminated it
indicates that there is a hea-

ture of the H.L. thermostat 95°C
to drop at least of 25 K.

Chimney-sweeper push button
(H)

This button allows the starting of
chimney-sweepers function, that
is to say that the boiler works at
maximum power (or at minimum
power) in order to allow adjust-
ment’s operations and combu-
stion's tests.
By pushing one time the button,
the boiler works at maximum ou-
tput. ( )

By pushing the button while the
boiler works at maximum output,
the boiler will work at minimum ou-
tput. ( )

To go back to the boiler normal
operation switch OFF and ON the
boiler via the A switch.

3.2

SWITCHING
ON / OFF

For the operation of the boiler in the

WINTER

mode the knob

''B''

reference must be posi-

tioned within the range indicated by the arrow
on the figure shown above. The limit of the
arrow corresponds to the minimum and maxi-
mum temperature values of 45°C and 78°C.

SWITCHING ON

D.H.W. temperature adjust-
ment range for the models:

IVEN 04 CTN/CTFS

D.H.W. temperature adjust-
ment range for the models:

IVEN 04 RTN/RTFS

when conbined with an
external D.H.W. tank.

Note: If a room thermostat is fitted, set it to
the desired temperature.

SWITCHING OFF

Switch off the boiler by acting on the switch

''A''

For the operation the boiler in

SUMMER