Unical RTN 24 Quick start guide

00331967 - 1aedition - 02/2004
IVEN 04
UK
RTN 24 - RTFS 24 - RTFS 28
CTN 24 F - CTFS 24 F - CTFS 28 F
INSTALLATION USE
AND MAINTENANCE

2
General info
IMPORTANT
This INSTRUCTION MANUAL, which is an integral and indispensable part of the product, must be handed over to the user by the plumbers and
must be kept in a safe place for future reference. The manual must be handed over with the boiler should it be sold or transferred.
This boiler must be used for the purposes for which it has been designed. Any other use shall be considered incorrect and therefore
dangerous.
The boiler must be installed in compliance with applicable laws and standards and according to the manufacturer’s instructions given in this
manual. Incorrect installation may cause injury to persons and/or animals and damage to property. The manufacturer shall not be held liable for any
such injury and/or damage.
Damage and/or injury caused by incorrect installation or use and/or damage and/or injury due to non-observance of the manufacturer’s instructions
shall relieve UNICAL from any and all contractual and extracontractual liability.
Before installing the boiler, check that the technical data corresponds to requirements for its correct use in the system.
Check that the boiler is intact and that it has not been damaged during transport and handling. Do not install equipment which is patently damaged
and/or faulty.
Do not obstruct the air suction and/or heat dissipation grates.
Only original accessories must be used for all boilers supplied with optionals or kits (including electrical ones).
Dispose of the packaging with care as all the materials can be recycled. The packaging must therefore be sent to specific waste management
sites.
Keep the packaging out of the reach of children as it may represent a choking and suffocation hazard.
In the event of failure and/or faulty functioning, switch off the boiler. Do not attempt to make repairs: contact qualified technicians.
Original parts must be used for all repairs to the boiler.
Non-observance of the above requirement may jeopardize the safety of the boilers and expose people, animals and property to danger.
To guarantee efficiency and correct functioning of the equipment it is legally binding to service the boilers once a year according to the
schedule indicated in the relative section of this manual.
In the event of long periods of inactivity of the boiler, disconnect it from the power mains and close the gas tap (Warning! In this case the boiler’s
electronic anti-freeze function will not be operative).
Should there be a risk of freezing, add anti-freeze: it is not advisable to empty the system as this may result in damage; use specific anti-freeze
products suitable for multi-metal heating systems.
N.B.
For boilers which use gaseous fuel, if you smell gas:
- do not turn on or off electrical switches and do not turn on electrical appliances;
- do not ignite flames and do not smoke;
- close the main gas tap;
- open doors and windows;
- contact a Service Centre, qualified installer or the gas supply company.
Never use flames to detect gas leaks.
WARNING
This boiler has been built for installation in the country indicated on the technical data plate: installation in any other country may be a source
of danger for people, animals and property.
Read the warranty conditions and clauses on the warranty certificate attached to the boiler with care.
‘’WATER TREATMENT IN C.H. SYSTEM FOR CIVIL USE’’
NOTE FOR INSTALLER AND USER
1) The frequency of the cleaning of the D.H.W. heat exchanger is related to the hardness of the feeding water.
2) With a water hardness higher than 28°f (16°d) the use of antiscaling devices, whose choice will be made on the base of water characteristics, is
suggested.
3) To increase the resistance to the scaling, a D.H.W. temperature adjustment very close to that one of the actual use, is suggested.
4) The adoption of a modulating room thermostat reduces the scaling danger.
5) We advise you to verify the state of cleaness of the D.H.W. heat exchanger at the end of the first year and subsequently every two years.

3
General info
DATA PLATE
®
2H
2E
3+
3B/P
3P
G20
G20
G30/G31
G30 - 31
G31
20 - 25
20
28-30/37
30 - 50
37 - 50
mbar
mbar
mbar
mbar
mbar
IT ES IE
PT GR
TR HR
CZ SK
HU
SI
GB
CN RU RO
LV E E LT
II 2H3+
II 2H3+
II 2H3B/P
II 2H3P
II 2HS 3B/P
II 2E3P
II 2H3P
I 2H
I 2H
20 ; 28-30/37 mbar
20 ; 28-30/37 mbar
20 ; 50 mbar
18 ; 50 mbar
25 ; 30 mbar
20 ; 50 mbar
20 ; 37 mbar
20 mbar
20 mbar
/
1
2
345
678
9
12
15
17
19
20
18
16
10
13
11
14
21
1 = P.I.N. code
2 = Boiler type (only for condensing boiler)
3 = (S.N°) Serial Nr.
4 = Manufacture Date
5 = Model
6 = Appliance type
7 = Elettrical supply
8 = Maximum absorbed power - Insulation
protection
9 = (Pn) Nominal Output
10 = (Pcond) Condensing Nominal Output
(only for condensing boiler)
11 = (D) Specific flow rate EN 625
12 = (Qn) Nominal heat input
13 = (Qnw) Nominal heat input for D.H.W.
system if there are different out puts
between the C.H. and D.H.W. circuits
14 = (NOx) NOx Class
15 = (PMS) Max pressure C.H. system
16 = (T max) Max Temperature C.H. system
17 = (PMW) Max pressure D.H.W. system
18 = (T max) Temperature D.H.W. system
19 = Adjusted for gas type X
20 = Country of destination, Gas category,
Supply pressure
21 = EN standards applicable to the boiler
type
GAS VALVE LABEL
00331980
Translation
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 suitable for
hemp, teflon strip or similar materials

4
General info
1
2
3
For your own safety, observe these safety instructions.:
PLEASE NOTE:
User tip for the optimum utilisation
and setting of the control(s) plus
useful information.
WARNING
from risk of electric shock.
WARNING
Identifies potentially dangerous
situations.
TECHNICAL FEATURES
AND DIMENSIONS .......................................................... pag. 5
1.1 Technical features ................................................................... pag. 5
1.2 Dimensions .............................................................................. pag. 5
1.3 Hydraulic circuits ..................................................................... pag. 6
1.4 Technical data ......................................................................... pag. 8
1.5 Main characteristics ................................................................ pag. 8
DIRECTIONS FOR
INSTALLERS ......................................................................... pag. 9
2.1 Installations rules .................................................................... pag. 9
2.2 Installation ............................................................................... pag. 9
2.2.1 Packing ....................................................................... pag. 9
2.2.2 Positioning the boiler .................................................. pag. 10
2.2.3 Assembling the boiler ................................................. pag. 11
2.2.4 Ventilation ................................................................... pag. 11
2.2.5 Flue gas discharge system ........................................ pag. 11
2.2.6 Discharge and suction pipe configuration .................. pag. 13
2.2.7 Positioning of terminals for type C boilers .................. pag. 14
2.2.8 Smoke evacuation Ø80 air suction flange .................. pag. 15
2.2.9 Discharge of flue gas into coaxial ducts with a
diameter of 100/60 mm (Type A accessories) ........... pag. 16
2.2.10 Flue gas discharge and air suction with separate
pipes with 80 mm diameter ........................................ pag. 17
2.2.11 Measurements of combustion efficiency ................... pag. 16
2.2.12 Connection to the gas mains ...................................... pag. 20
2.2.13 Hydraulic connection .................................................. pag. 20
2.2.14 Arrangement for a D.H.W. tank................................... pag. 22
2.2.15 Electrical connection .................................................. pag. 23
2.3 Wiring diagram ......................................................................... pag. 24
2.3.1 Pratical connection diagram ....................................... pag. 24
2.3.2 Jumper location .......................................................... pag. 25
2.4 Filling the system .................................................................... pag. 25
2.5 Starting the boiler .................................................................... pag. 25
2.6 Adjusting the burner ................................................................ pag. 26
2.7 Modification of other gases ..................................................... pag. 27
2.8 Adjustement of the output to ch system's needs ................... pag. 29
2.9 Finding chart and corrective actions ...................................... pag. 29
2.10 Failure code ............................................................................. pag. 31
USERS' INSTRUCTION ............................................... pag. 32
3.1 Control panel ........................................................................... pag. 32
3.2 Switching on/off ....................................................................... pag. 33
3.3 Antifrost protection .................................................................. pag. 34
3.4 Important suggestion and notes ............................................. pag. 34

5
Installation info
1TECHNICAL FEATURES AND DIMENSIONS
fig. 1
1.2 - DIMENSION
A
420 345
800
1.1 - TECHNICAL FEATURES
IVEN 04 is a wall hung gas boiler with built-in
atmospheric gas burner; it is available in the
following versions:
24 with 24 kW output;
28 with 28 kW output;
Cwith instantaneous D.H.W. production;
R- for heating only;
TN with natural draught open chamber;
TFS with forced draught room sealed com
bustion chamber;
All versions have electronic ignition.
Models in the IVEN
04 series are the following:
IVEN 04 CTN 24 F open boiler, with electronic
ignition and instantaneous D.H.W. production;
IVEN 04 RTN 24 F open boiler, with electronic
ignition, for heating only;
IVEN 04 CTFS 24 F forced draught room sea-
led boiler, with electronic ignition and instan-
taneous D.H.W. production;
IVEN 04 RTFS 24 F forced draught room sea-
led boiler, with electronic ignition for heating
only;
IVEN 04 CTFS 28 F forced draught room sea-
led boiler with electronic ignition and instanta-
neous D.H.W production;
IVEN 04 RTFS 28 F forced draught room sea-
led boiler with electronic ignition for heating
only;
IVEN 04 is supplied with all control and sa-
fety features according to the latest laws in
force.
The main technical features of the IVEN 04
boilers are summarised below.
•Bithermal, copper, high performance heat
exchanger;
•Electronic ignition;
•Electronic flame modulation;
•Minimum output control;
•Electronic control of ignition ramp;
•Anti-freeze function;
•Pump anti-jamming function;
•Pump over run function;
•High limit thermostat (95°C);
•Three-speed circulating pump;
•Expansion vessel;
•Automatic air vent;
•C.H. system water filling valve except Fren-
ch, Belgium and England version) ;
•Safety pressure switch for low water level;
•Priority flow switch for D.H.W.;
•Tap water flow rate restrictor set at 10 li-
tres/min, for 24 kW boilers (brown) and 12
l/min, for 28 kW boilers (pink)
Note: This 10 (12) l/min flow rate
is guaranteed with a upstream
pressure of 2 bar. If the upstream
pressure is much higher than 2
bar, then it is possible to reduce the flow
rate to 10 (12) l/min by rotating clock-wise
the screw ‘’A’’. On the contrary, if the up-
stream pressure is lower than 2 bar it is
possible to reach the flow rate of 10 (12) l/
min by rotating counter clock-wise the
screw ‘’A’’. If, also in this case the flow
rate of 10 (12) l/min is not reacheable then
the flow restrictor can be removed from its
seat.
•Control panel with IP 44 insulation protec-
tion
•Temperature and pressure gauge;
•Warning light for: presence of power, re-
quest for heating, burner in operation, lock
out;
•ON-OFF switch;
•D.H.W. temperature selector (35/57°C) for
IVEN 04 CTN 24 F-CTFS 24 F-CTFS 28 F
+ antifrost position;
(25/57°C) for IVEN 04 RTN 24 - RTFS 24 -
set off only if arranged with storarage tank
•C.H. temperature selector (45/78°C) + sum-
mer/winter position.
•Reset button;
•Chimney sweeper button
•Mounting jig
•Mounting frame with valves (opt.)
•Flue gas antispillage thermostat 75°C
(IVEN 04 TN)

6
Installation info
1.3 - HYDRAULIC CIRCUIT
fig. 3
IVEN 04 CTN 24 F
IVEN 04 CTFS 24 F - IVEN 04 CTFS 28 F
fig. 2
12 13
5
6
8
9
10
14
15
17
4
7
19
18
20
3
1
2
21
9
11
16
RF
GMC
R
F
G
MC
3
19
4
7
6
8
9
13
14
15
18
16
17
5
20
22
23
12
11
21
24
8
1
2
10
1 Heating circuit safety valve
2 Minimum water pressure switch
3 Filling valve (except French, Belgium
and England version)
4 D.H.W. temperature sensor
5 Gas valve
6 Expansion vessel
7 Burner nozzles
8 Expansion vessel filling valve
9 Ignition electrode
10 Bithermal heat exchanger
11 H.L. thermostat
12 Flue gas manifold/down-draught
dverter
13 Flue gas anti-spillage thermostat
14 Ionisation electrode
15 C.H. temperature sensor
16 Automatic air vent
17 Circulating pump
18 D.H.W. flow restrictor 10-12 l/min
19 Flow switch
20 Cold water filter
21 By-pass
M C.H. system flow
C D.H.W. outlet
G Gas inlet
F D.C.W. inlet
R C.H. system return
1 Heating circuit safety valve
2 Minimum water pressure switch
3 D.H.W. temperature sensor
4 Expansion vessel
5 Gas valve
6 Burner nozzles
7 Expansion vessel filling valve
8 Ignition electrode
9 Bithermal heat exchanger
10 H.L. thermostat
11 Room sealed combustion chamber
12 Flue gas extractor fan
13 Air/flue coaxial duct
14 Micro-switch on flue gas pressure
switch
15 Flue gas pressure switch
16 Ionisation electrode
17 Heating temperature sensor
18 Automatic air vent
19 Circulating pump
20 Filling valve (except French, Belgium
and England version)
21 D.H.W. flow restrictor 10-12 l/min
22 D.H.W. Flow switch
23 Cold water filter
24 By-pass
M C.H. system flow
C D.H.W. outlet
G Gas inlet
F D.C.W. inlet
R C.H. system return

7
General info
R
G
M
R
G
M
fig. 5
IVEN 04 RTFS 24 - IVEN 04 RTFS 28
fig. 4
18
3
6
5
7
8
11
12
13
14
15
16
4
19
10
9
910
4
3
6
7
811
12
13
14
15
16
5
17
20
11
15
1
2
1
2
17
IVEN 04 RTN 24 1 Heating circuit safety valve
2 Minimum water pressure switch
3 Expansion vessel
4 Gas valve
5 Burner nozzles
6 Expansion vessel filling valve
7 Ionisation electrode
8 Heat exchanger
9 Flue gas manifold/down-draught
diverter
10 Flue gas anti-spillage thermostat
11 Ignition electrode
12 H.L. thermostat
13 C.H. temperature sensor
14 Automatic air vent
15 Circulating pump
16 Filling valve (except French,
Belgium and England version)
17 By-pass
M C.H. system flow
G Gas inlet
R C.H. system return
1 Heating circuit safety valve
2 Low water level pressure switch
3 Expansion vessel
4 Gas valve
5 Burner nozzles
6 Expansion vessel filling valve
7 Ionisation electrode
8 Heat exchanger
9 Room sealed combustion chamber
10 Flue gas extractor fan
11 Air/flue coaxial duct
12 Micro-switch on flue gas pressure
switch
13 Flue gas pressure switch
14 H.L. thermostat
15 Ignition electrode
16 Heating temperature sensor
17 Automatic air vent
18 Circulating pump
19 Filling valve (except French,
Belgium and England version)
20 By-pass
M C.H. system flow
G Gas inlet
R C.H. system return

8
General info
Warning:If the boilers are used in low tem-
perature heating system (ex. floor hea-
ting)
it is necessary to use a mixing valve to
avoid condensation phenomena.
l/min
bar
bar
l
°C
°C
l
bar
l
l
bar
bar
l/min.
l/min.
l/min.
l/min.
l/min.
l/min.
l/min.
°C
V-Hz
A (F)
W
IP
kg
kW
kW
%
%
%
%
n.
%
%
%
°C
g/s
%
%
mg/kWh
%
%
RTN 24
23,88
10,07
90,11
89,76
88,53
87,3
2
92,6
90,2
2,6 - 2,5
91,8
18-20
113,8
2,4-5,3
197
2
9,8 - 7,4
0,486
RTFS 24
23,94
9,95
90,34
89,76
88,60
87,14
2
93,3
87,9
1,88-2,96
112,5
13,64-14,38
67,7
3,0-7,4
157
2
12,1-6,7
0,295
CTN 24 F
23,88
10,07
90,11
89,76
88,53
87,3
2
92,6
90,2
2,6 - 2,5
91,8
18-20
113,8
2,4-5,3
197
2
9,8 - 7,4
0,486
CTFS 24 F
23,94
9,95
90,34
89,76
88,60
87,14
2
93,3
87,9
1,88-2,96
112,5
13,64-14,38
67,7
3,0-7,4
157
2
12,1-6,7
0,295
RTFS 28
27,45
9,80
90,01
89,88
87,43
87,32
2
93,2
86,8
1,76-3,19
87,7
17,5-17,6
60,86
2,65-7,9
163
2
13,2-6,8
0,256
RTN 24
II2H3+
7,2
0,5
3
3,5
81
45
8
1
183,9
-
-
-
-
-
-
-
-
-
-
230/50
4
70
X4D
37
CTN 24 F
II2H3+
7,2
0,5
3
3,5
81
45
8
1
183,9
2,5
0,5
6
11,5
10
7,6
8,6
9,78
11,4
13,69
35 - 57
230/50
4
70
X4D
37
CTFS 24 F
II2H3+
7,37
0,5
3
3,5
81
45
8
1
183,9
2,5
0,5
6
11,5
10
7,6
8,58
9,80
11,44
13,73
35 - 57
230/50
4
130
X4D
37
RTFS 24
II2H3+
7,37
0,5
3
3,5
81
45
8
1
183,9
-
-
-
-
-
-
-
-
-
-
-
230/50
4
130
X4D
37
RTFS 28
II2H3+
7,02
0,5
3
3,5
81
45
8
1
183,9
-
-
-
-
-
-
-
-
-
-
-
230/50
4
130
X4D
37
IVEN 04
CTFS 28 F
II2H3+
7,02
0,5
3
3,5
81
45
8
1
183,9
2,5
0,5
6
12,5
12
8,74
9,84
11,24
13,11
15,74
35 - 57
230/50
4
130
X4D
37
CTFS 28 F
27,45
9,80
90,01
89,88
87,43
87,32
2
93,2
86,8
1,76-3,19
87,7
17,5-17,6
60,86
2,65-7,9
163
2
13,2-6,8
0,256
1.4 - OPERATING DATA
Nominal output
Minimum output
Actual water efficiency at full load (100%)
Min. required water efficiency at full load (100%)
Actual water efficiency at part load (30%)
Min. required water efficiency at part load (30%)
Stars No. off (According EEC Directive 92/42)
Combustion efficiency at nominal load (100%)
Combustion efficiency at part load (30%)
Stand-by losses (min.-max.)
(*)Flue gas temperature (min. - max.)
Flue gas mass flow rate (min. - max)
Excess of air l
CO2
NOX(value according EN 297/A3 + EN 483)
NOXclass
Flue losses with burner in operation (min.-max)
Flue losses with burner off
For the following data: Nozzle - Burner pressure - Diaphragm (where applicable) - Inputs - Gas consumptions refer to pagraph SUITABILITY TO USE
OTHER GASES.
Appliance category
Min. water flow rate in CH circuit (Dt 20 K)
Min. pressure in CH circuit
Max. pressure in CH circuit
Water content primary circuit
Max. oper. temperature in CH mode
Min. oper. temperature in CH mode
Total capacity of expansion vessel
C.H. expansion vessel pre-loading
Max. water content CH circuit (calc. x max. T°of 82°C)
Min. water flow rate in D.H.W. circuit
Min. DHW. pressure
Max. DHW. pressure
DHW specific flow rate (Dt 30 K)
Flow restrictor
DHW production in continuous operation with Dt 45 K
DHW production in continuous operation with Dt 40 K
DHW production in continuous operation with Dt 35 K
DHW production in continuous operation with Dt 30 K*
DHW production in continuous operation with Dt 25 K*
DHW Temperature range
Electrical supply
Supply fuse
Maximun absorbed power
Insulation protection
Net weight
1.5 - GENERAL FEATURES
(*) mixed

9
Installation info
fig. 6
2.2.1 - PACKING
IVEN 04 24 F is delivered completely assem-
bled and packed in a strong cardboard box.
Once the boiler has been unpacked check that
it is intact.
2DIRECTIONS FOR
INSTALLER
2.1 - DIRECTIONS FOR
INSTALLER
IVEN 04 is a gas boiler which must be
installed in accordance with the latest re-
gulations or rules in force. For the boiler
category, which changes according to the
destination country, see page 4.
NOTE:
Observe the corresponding technical rules
and the building supervisory and statutory
regulations of the country of final use when
installing and operating the system.
Always ensure that an appropriately
specialised company is entrusted with
installation, gas supply and flue gas
connection, commissioning and power
supply connection, as well as all servicing
and repair work.
Work on gas conduits and fittings must
only be carried out by a registered service
provider.
The system must be cleaned and serviced
once a year. This includes an inspection
900
495
390
Keep the packaging material
(cardboard box, plastic strips,
plastic bag, etc.) out of the rea-
ch of children as it represents
a choking and suffocation ha-
zard.
In addition to the boiler packaging contains:
- a bag with:
- installation, use and maintenance
handbook,
- warranty card
- template for fixing the boiler to the wall,
- 2 dowels with screws hook to fix the boiler
to the wall,
- Only for models TFS, a diaphragm for flue
gas outlet
UNICAL refuses all liability for
injury to persons and animals
or damage to property resul-
ting from non-observance of
the above.
of the entire system to see if it is in full
working order.
Defects and faults must be eliminated
immediately.
Please note that we can accept no liability
whatsoever for loss or injury resulting from
unauthorised adjustment or manipulation
of the system’s control or regulating
devices.
2.2 - INSTALLATION

10
Installation info
fig. 7
2.2.2 - POSITIONING THE BOILER
Every boiler is supplied with special “MOUN-
TING JIG” with which the pipes for connec-
tion to the system, D.H.W. and gas can be
positioned when the hydraulic system is being
laid out and before the boiler is installed.
This MOUNTING JIG, comprising a sheet of
strong paper which must be fixed to the wall
chosen for the installation of the boiler, gives
all the indications needed to make the holes
in the wall using two screws with expanding
dowels.
Use the lower part of the MOUNTING JIG to
mark the exact point of the connection of the
gas supply, cold water supply pipe, D.H.W.
outlet, C.H. flow and return.
When choosing the position of the boiler:
- refer to the indications given in the section
“Flue gas evacuation system “.
- leave a clearance of 50 mm on each side
of the boiler to facilitate maintenance ope-
rations.
- check that the wall is suitable.
- avoid fixing the boiler to thin partitions.
- avoid installing the boiler above applian-
ces which might affect operation when in
use (cookers which produce greasy ste-
am, washing machines, etc.)
- avoid installing natural draught boilers in
corrosive or very dusty atmospheres such
as hairdressers’, laundrettes, etc. as the
life of the boiler components could be si-
gnificantly shortened.
L
M= C.H. system
flow
C= D.H.W.
outlet
G=Gas
F= Cold water
inlet
R= C.H. system
return
S= Safety valve
discharge
ØLmm
= 3/4'' 144
= 1/2'' 144
= 3/4'' 153,5
= 1/2'' 144
= 3/4'' 144
= 195,5
For IVEN 04 TFS
Since the temperature of the wall
on which the boiler is installed
and the temperature on the sur-
face of the coaxial duct do not
IVEN 04 TN
Maintain distance of at least 200
mm on the sides with wall which
have inflammable materials. CONNECTION POSITION SEEN FROM ABOVE
MOUNTING JIGS FOR BOILER CONNECTIONS
increase, in normal operating conditions, more
than 60 K, it is not necessary to keep a mini-
mum distance from inflammable walls.
For boilers with dual suction and exhaust ducts,
place insulating material between the wall and
the pipe in the case of inflammable walls and
wall crossings.
195.5
153.5
144
MCGFR
Filling of
C.H. system
Safety
valve discharge
85 85