Riello STEEL PRO POWER Service manual

cod. 20160375 rev. 6 12/2020
Steel Pro Power
EN INSTALLATION, TECHNICAL ASSISTANCE SERVICE AND SYSTEM MANAGEMENT MANUAL

3
This manual, Code 20160375 - Rev. 6 (12/2020)
comprises 116 pages.
2
RANGE
MODEL CODE
STEEL PRO POWER 114-2 P 20138572
STEEL PRO POWER 140-2 P 20138573
STEEL PRO POWER 180-2 P 20138574
STEEL PRO POWER 230-2 P 20138575
STEEL PRO POWER 270-2 P 20138576
STEEL PRO POWER 300-3 P 20138577
STEEL PRO POWER 345-3 P 20138578
STEEL PRO POWER 405-3 P 20138579
STEEL PRO POWER 460-4 P 20138580
STEEL PRO POWER 540-4 P 20138581
STEEL PRO POWER 114-2 V 20138582
STEEL PRO POWER 140-2 V 20138583
STEEL PRO POWER 180-2 V 20138584
STEEL PRO POWER 230-2 V 20138585
STEEL PRO POWER 270-2 V 20138586
STEEL PRO POWER 300-3 V 20138587
STEEL PRO POWER 345-3 V 20138588
STEEL PRO POWER 405-3 V 20138589
STEEL PRO POWER 460-4 V 20138590
STEEL PRO POWER 540-4 V 20138591
ACCESSORIES
For a complete list of accessories and details of their compatibil-
ity, refer to the Catalogue.
ENGLISH
Dear heating engineer,
we congratulate you for proposing a modular system Rwhich
is able to ensure maximum and long lasting well-being with
high reliability, efciency, quality and safety.
This manual provides information that is essential to the in-
stallation of the appliance. Used in conjunction with your own
knowledge and expertise it will enable you to install the appli-
ance quickly, easily, and correctly.
Please accept our thanks and our congratulations on your choice
of product.
Riello S.p.A.
CONFORMITY
thermal modules Steel Pro Power comply with:
−Regulation (EU) 2016/426
−Directive 92/42/EEC on efciency requirements and Annex
E and Pres. Republic Decree n. 412, 26 August 1993 (****)
−Electromagnetic Compatibility Directive 2014/30/EU
−Low Voltage Directive 2014/35/EU
−Ecodesign Directive 2009/125/CE for energy-related prod-
ucts
−Regulation (EU) 2017/1369 Energy labelling
−Delegated Regulation (EU) N. 811/2013
−Delegated Regulation (EU) N. 813/2013
−Standard for gas-red heating boilers - General require-
ments and tests - EN 15502-1
−Specic standard for type C appliances and type B2, B3
and B5 appliances of nominal heat input not exceeding
1000 kW - EN 15502-2/1
−SSIGA Gas Appliance Directive G1
−AICAA Fire prevention requirements
−CFST LPG Directive Part 2
−VARIOUS cantonal and communal provisions on air qual-
ity and energy saving.
At the end of its life, the product should
be not be disposed of as solid urban
waste, but rather it should be handed
over to a differentiated waste collection
centre.
CONTENTS
The following symbols are used in this manual:
9 CAUTION! = Identies actions that require caution and
adequate preparation.
0 STOP! = Identies actions that you MUST NOT do.
Thismanual,Code
-Rev.
comprises
pages.
1 GENERAL INFORMATION ............................4
1.1 General Safety Information ......................4
1.2 Precautions..................................4
1.3 Description of the appliance .....................5
1.4 Safety devices ................................5
1.5 Identication ................................6
1.6 System layout ................................7
1.7 Technical specications.........................9
1.8 ERP data ................................... 14
1.9 Pumps .................................... 16
1.10 Water circuit ................................ 18
1.11 Positioning the temperature sensors.............. 19
1.12 Control panel ...............................20
2 INSTALLATION .....................................21
2.1 Unpacking the product ........................ 21
2.1.1 Positioning of labels .......................... 21
2.2 Overall dimensions and weights ................. 22
2.3 Installation premises .........................23
2.3.1 Recommended minimum distances ..............23
2.4 Installation in older systems and systems requiring
modernisation .............................. 23
2.5 Moving and removing the packing ...............23
2.6 Water connections ...........................25
2.7 Typical water system schematics .................26
2.7.1 Electrical power connections Block diagram 1 ....... 27
2.7.2 Connecting sensors/room thermostats Diagram 1 .... 27
2.7.3 Bus connections Block diagram 1 ................28
2.7.4 Setting switch S1 Block diagram 1.................28
2.7.5 Electrical power connections Block diagram 2 .......30
2.7.6 Connecting sensors/room thermostats Diagram 2 ....30
2.7.7 Bus connections Block diagram 2 ................ 31
2.7.8 Setting switch S1 Block diagram 2 ................ 31
2.7.9 Electrical power connections Block diagram 3.......33
2.7.10 Connecting sensors/room thermostats Diagram 3 ....33
2.7.11 Bus connections Block diagram 3 ................34
2.7.12 Setting switch S1 Block diagram 3 ................34
2.7.13 Electrical power connections Block diagram 4.......36
2.7.14 Connecting sensors/room thermostats Diagram 4 ....36
2.7.15 Bus connections Block diagram 4 ................ 37
2.7.16 Setting switch S1 Block diagram 4 ................ 37
2.8 Gas connections .............................38
2.9 Discharge of combustion products ...............38
2.9.1 Preparation for the condensate drain .............40
2.10 Neutralization of the condensate ................ 41
2.10.1 Water quality requirements..................... 41
2.11 System lling and emptying ....................42
2.11.1 Filling .....................................42
2.11.2 Emptying ..................................42
2.12 Wiring diagram ..............................43
2.13 Electrical connections ......................... 47
2.13.1 INAIL security connection ......................49
2.13.2 Connection available on terminal board ...........49
2.14 Electronic control ............................50
2.14.1 Menu structure .............................. 51
2.14.2 Parameters' list ..............................59
3 COMMISSIONING AND MAINTENANCE...............66
3.1 Initial startup ...............................66
3.1.1 Switching the appliance on and off ..............66
3.1.2 Date and time setting .........................66
3.1.3 Password access .............................67
3.1.4 Setting the heating parameters..................67
3.1.5 Setting the domestic hot water parameters ........70
3.1.6 Scheduled programme .........................71
3.1.7 Thermal module information ...................74
3.2 Checks during and after initial start-up ...........75
3.3 Error List ................................... 77
3.3.1 Permanent Errors ............................ 77
3.3.2 Temporary Errors............................. 77
3.3.3 Warnings .................................. 77
3.4 Transformation from one gas type to another .......78
3.5 Adjustments ................................80
3.6 System antifreeze protection.................... 81
3.7 Temporary or short-term shut-down .............82
3.8 Preparing for extended periods of disuse ..........82
3.9 Replacing and conguring the display board .......83
3.10 Replacing and conguring the control board .......84
3.11 Maintenance................................85
3.11.1 "Service reminder" function ....................85
3.12 Cleaning and removing internal components .......86
3.13 Troubleshooting .............................88
4 CASCADE CONNECTION............................89
4.1 Connection in a direct cascade ..................89
4.1.1 I/O assignment ..............................89
4.1.2 Setting the dip-switch ........................90
4.1.3 Bus connection.............................. 91
4.1.4 Setting the main parameters ...................92
4.2 Connection in a cascade of cascades..............93
4.2.1 Bus connection..............................94
4.2.2 Setting the main parameters ...................94
4.3 Operation with the primary sensor ...............95
4.4 Operation with the secondary sensor .............95
4.5 Parameter 148: operating mode of the cascade......95
4.5.1 Par 148 = 0 .................................95
4.5.2 Par 148 = 1..................................96
4.5.3 Par 148 = 2 .................................96
4.6 Parameters specic to cascade systems ...........97
5 ZONE DEPENDING.................................100
5.1 Zone control with Depending module............ 100
5.2 Setting zone parameters (accessible only with
installer password) .......................... 100
5.2.1 Deleting dependent zone ......................101
6 MANAGING ADDITIONAL ZONE.....................102
6.1 Controlling zone with additional zone accessory .....102
6.2 Setting parameters of the additional zone ........ 103
6.3 Setting zone parameters (accessible only with
installer password) .......................... 103
6.3.1 Menu structure ............................. 104
6.4 Setting zone's climatic curve parameters (accessible
only with installer password) .................. 105
6.5 Programming the zone . . . . . . . . . . . . . . . . . . . . . . . 105
6.6 Scheduling the time bands .................... 106
6.7 Information on the operation of the zone..........107
7 SYSTEM MANAGER ...............................108
7.1 Putting into service .......................... 108
7.2 Temporary or short-term shut-down ............ 109
7.3 Preparing for extended periods of disuse ......... 109
7.4 Cleaning .................................. 109
7.5 Maintenance............................... 109
7.6 Useful information ...........................110
8 MODBUS CONNECTION............................111
9 RECYCLING AND DISPOSAL .......................115

54
GENERAL INFORMATION GENERAL INFORMATION
1 GENERAL INFORMATION
1.1 General Safety Information
9 After removing the packaging, check the condition and
completeness of the supply. If there are any problems, con-
tact the company R that sold the equipment.
9 This product must be installed by a legally qualied heat-
ing engineer. On completion of the installation, the install-
er must issue the owner with a declaration of conformity
conrming that the installation has been completed to the
highest standards in compliance with the instructions pro-
vided by Rin this instruction manual, and that it con-
forms to all applicable laws and standards.
9 This product must only be used for the purpose for which it
is designed and made, as specied by R. Rdeclines
all responsibility, contractual or other, for damage to prop-
erty or injury to persons or animals caused by improper in-
stallation, adjustment, maintenance or use.
9 In the event of a water leak, disconnect the thermal module
from the main power supply, shut off the water supply and
promptly notify the Technical Assistance Service Ror pro-
fessionally qualied personnel.
9 Regularly check that the condensate drain is free from ob-
struction.
9 Periodically check that operating pressure in the water cir-
cuit is over 1 bar but below the maximum limit specied for
the boiler. If this is not the case, contact Technical Assistance
Service R or a professionally qualied heating engineer.
9 The following operations shall be necessary if the thermal
module is not used for a long period of time:
−Switch the boiler OFF at the control panel
−Turn the main system switch "off"
−Close the fuel cock and heating circuit water cock
−Drain the central heating circuit if there is any risk of
freezing.
9 Maintenance must be performed on the thermal module at
least once a year.
9 This manual is an integral part of the appliance and must
therefore be kept with care and must ALWAYS accompany
the thermal module, even when it is passed on to another
owner or user or transferred to another installation. If it is
lost or damaged, please contact your local Technical Assis-
tance Service Rfor a new copy.
9 This manual must be read carefully so as to ensure the cor-
rect and safe installation, operation and maintenance of
the appliance. The Owner must be adequately informed
and trained on how to operate the appliance. Make sure
that he/she is familiar with all the information required for
safe system operation.
9 The thermal module, before being connected to the hy-
draulic system, the gas network, and the electrical system,
may be exposed to temperatures ranging from 4°C to 40°C.
After it can activate the Frost Protection function, it can be
exposed to temperatures ranging from -20°C to 40° C
9 We recommend cleaning inside the exchanger once a year,
extracting jet and burner and removing any installation de-
bris by suction. This operation should be done by personnel
from the Technical Assistance Service only.
1.2 Precautions
The operation of any appliance that uses fuel, electrical power
and water demands that a number of fundamental safety pre-
cautions be respected:
0 Do not allow children or inrm persons to operate the sys-
tem unsupervised.
0 It is forbidden to use electrical devices or equipment, such
as switches, appliances, etc. if there is a smell of gas or un-
burnt products. If so:
−Ventilate the room, opening doors and windows
−Close the fuel shut-off cock
−Report the fault immediately to the R's Technical As-
sistance Service or a professionally qualied heating en-
gineer.
0 Do not touch the boiler while barefoot or wet.
0 Any technical or cleaning activity is forbidden before dis-
connecting the appliance from the main power supply by
switching the system's master switch and the appliance's
main switch to the "OFF" position.
0 Do not tamper with or adjust the safety or control devices
without prior authorisation and instructions from the man-
ufacturer.
0 Do not plug or block the condensate drain outlet.
0 Never pull, disconnect, or twist the electrical cables coming
from the appliance even if it is disconnected from the mains
electricity supply.
0 Do not obstruct or restrict the vents in the room where the
boiler is installed. Adequate ventilation is essential for cor-
rect combustion.
0 Do not expose the appliance to weather elements (without
using the dedicated accessory). It has been designed for in-
door use.
0 Do not switch off the appliance if the outdoor temperature
may drop to below ZERO (frost hazard).
0 Do not leave ammable containers and substances in the
room where the device is installed.
0 Do not dispose of packaging material into the environment,
or leave it within the reach of children, since it can become
a potential hazard. Dispose of packaging material in com-
pliance with applicable legislation.
0 Do not activate the thermal module without water.
0 Individuals without specic qualications and skills are not
allowed not remove the thermal module's casing.
1.3 Description of the appliance
Steel Pro Power is a modular, premixed condensing system,
consisting of a cascade of modulating thermal elements in-
stalled inside a frame assembled in anodised aluminum and
painted panels.
The standard product is suitable for indoor installation, with
open chamber combustion; it can be transformed either into
sealed combustion or into indoor version by means of some
specic accessory kits that increase its electrical protection up
to IPX5D.
The cabinets are equipped with 2, 3 or 4 thermal elements from
57 up to 131 kW, for a total power of 114 up to 524 kW and are
available in versions that have low-consumption pumps ("P"
versions) or 2-way valves ("V" versions).
The models with heat-exchanger from 131 kW (270-2 P/V - 405-3
P/V - 540-4 P/V) are suitable for cascade installation, with side
by side coupling, up to a maximum of 10 total thermal elements
and a power of 1310 kW.
The optimal management of combustion allows both high ef-
ciency levels (exceeding also the 109%, value calculated on the
PCI, under condensation) and low pollutant emissions (Class 5
according to UNI EN 297).
The main technical features of the appliance are:
−pre-mix burner with constant air-gas ratio;
−helicoidal heat exchanger with double coil with smooth
stainless steel pipe, to guarantee good corrosion resist-
ance and the option of operating with high ∆ts (up to
40°C), reducing system set-up times;
−power from 114 to 524 kW;
−maximum ue gas output temperature 100°C;
−microprocessor management and control with self-di-
agnostics, shown by means of a display, and logging of
main errors;
−Anti-Frost function;
−external probe that enables the climate control function;
−provision for room thermostat / heat request on high or
low temperature zones;
−option to manage a CH circuit and a DHW circuit with
storage tank;
−high efciency pump with high residual head mounted
on all "P" versions
1.4 Safety devices
All the functions of each thermal element are electronically con-
trolled by a board approved to perform safety functions with
dual processor technology.
Any malfunction results in the appliance being shut down and
the automatic closure of the gas valve.
On the water circuit of each thermal element are installed:
−Safety thermostat.
−Flow sensor capable of monitoring the main circuit's
ow on an ongoing basis and of stopping the appliance
in the event of insufcient ow.
−Temperature probes on the ow and return that con-
tinuously measure the difference in temperature (∆t)
between inlet and outlet uid and allow the control to
intervene.
On the combustion circuit of each thermal element are installed:
−Gas solenoid in class B+C , with pneumatic gas ow com-
pensation depending on the suction line's air ow rate.
−Ionisation electrode for detection.
−Flue gases temperature probe.
−The Minimum pressure switch is installed on the mani-
fold of the thermal module
9 The triggering of safety devices indicates the malfunction of
a potentially hazardous thermal module. Therefore, con-
tact Technical Assistance Service immediately. After a brief
pause, it is possible to try and restart the appliance (see
Paragraph "Initial startup").
9 Safety devices must be replaced by Technical Assistance Ser-
vice, using only original parts. Refer to the spare parts cata-
logue supplied with the appliance. After making the repair,
check that the appliance is working properly.
0 The appliance must not be put in service, even temporarily,
when tampered safety devices are not in operation or have
been tampered with.

76
GENERAL INFORMATION GENERAL INFORMATION
1.5 Identication
The products are identied by:
Technical data plate
It indicates the technical and performance data.
It is placed inside the left door of the appliance door.
Qm=
RIELLO S.p.A.
Via Ing.Pilade Riello, 7
37046 Legnago (VR)
ITALY
II2H3+
G20 - 20 mbar
Cod.
Caldaia a condensazione
Condensing boiler
Chaudierè a condensation
Caldera de condensación
Centrala in condensatie
Kondensácios kazán
N°
230V ~ 50Hz W
X4D

P.min.G20= 20 mbar
IP
Caldaia regolata per: Boiler set at: Chaudiére adaptée pour: Caldera regulata para: Caldeira regulada para: Kedel indistillet till: Pe c nastavljena za: Centrala reglata pentru: Bojler namenjen za plin:
Paese di destinazione: Destination country: Pays de destination: Pais de destino: Pais de destino: Destinationsland: Ciljna drzva: Tara de destinatie: Destinacija: Kraj przeznaczenia:
0085 / 18
NOx:
bar
kW
Pn=
kW
kW
Pm=
II2H3+
Pm=
I2E(S)
I3+
II2E+3+
LU : G20=20 mbar G31=37 mbar
PL-RU: G20=20 mbar G30= 37 mbar (RU=37mbar)
FR: G20/25= 20/25mbar G30/G31=28-30/37mbar
II2E3B/P
BE : G30/G31=28-30/37mbar G31=28-30/37mbar
PMS=
II2ELL3B/P
PL: G20=20mbar G30/G31=30mbar
II2ELwLs3P
I2E3P
II2H3B/P
II2H3P
II2ESi3B/P
50-30 °C80-60 °C80-60 °C
IT-AT-BE-CH-CY-CZ-DE-DK-EE-ES-FI-FR-GB- GR-HR-HU-PL
I3B/P
SK: G20=20mbar (ES=18mbar) G30=28-30mbar G31=37mbar
II2ESi3+
DE: G20/25=20 mbar G30=50 mbar
FR : G20/G25=20/25 mbar G30/G31=28-30/37 mbar
RO-IE-SI-BG-DK-SK-EE--SE-NO-LV-LT-FI-TR:G20=20mbar G30=30mbar
FR: G20/25= 20/25mbar G30=28-30mbar
II2H3B/P
HR:G20=20mbar G30/G31=30mbar HU: G20=25mbar G30=30mbar
II2H3B/P
SK-CZ-LU-AT-CH:G20=20mbar G30=50mbar
SI-SK: G20=20mbar G31=37mbar
II2L3B/P
NL: G25=25mbar G30=30mbar
0085CP0214
T= °C
Qn=
MT-CY-IS: G30=30mbar
kW
kW
Pn=

IT-GB-GR-IE-PT-SI: G20=20mbar G30/G31=28-30/37mbar
BE : G20/25=20/25 mbar
Pn=
G20
kW Qn=
G20
G25
G25
Qm=
kW
Pn=
kW
kW
kW
Central heating section
Qn Rated heat input
Pn Rated useful heat output
IP Electric degree of protection
PMW Maximum operating pressure,
DHW circuit
TTemperature
η Efciency
D Specic ow rate
NOx NOx class
9 If these plates or any other means of clearly identifying the product are defaced, removed or lost, proper installation and ser-
vicing may be rendered difcult.
1.6 System layout
Steel Pro Power 114-2 P/V ÷ 270-2 P/V
1
3
2
30 333231
25
26
14
11
4
5
3
8
10
9
28
12
29
27
13
22
23
24
21
18
19
20
15
16
6
7
17
1 Gas valve
2 Gas cock
3 Gas manifold
4 Fan
5 Electrode
6 Flow probe
7 Safety thermostat with reset by the board
8 Automatic bleed valve
9 Delivery pipe unit
10 Combustion chamber
11 Flow-meter
12 Unit return probe
13 Minimum pressure switch
14 Unit drain valve
15 Gas pipe unit
16 Unit inlet pipe
17 Flue Manifold
18 Flue exhaust pipe unit
19 Clapet unit
20 Condensate drain unit
21 Return pipe unit
22 Two-way valve return unit
23 Water return manifold
24 Condensate collector
25 Water ow manifold
26 Delivery probe socket
27 Unit pump / 2-way valve
28 Exhaust ue probe
29 Unit switch
30 Control board
31 Terminal strip
32 Display
33 Mains power switch

98
GENERAL INFORMATION GENERAL INFORMATION
Steel Pro Power 300-3 P/V ÷ 540-4 P/V
1 230 333231
29
4
5
3
8
10
9
28
12
27
13
3
25
26
14
11
22
23
24
21
18
19
20
15
16
6
7
17
1 Gas valve
2 Gas cock
3 Gas manifold
4 Fan
5 Electrode
6 Flow probe
7 Safety thermostat with reset by the board
8 Automatic bleed valve
9 Delivery pipe unit
10 Combustion chamber
11 Flow-meter
12 Unit return probe
13 Minimum pressure switch
14 Unit drain valve
15 Gas pipe unit
16 Unit inlet pipe
17 Flue Manifold
18 Flue exhaust pipe unit
19 Clapet unit
20 Condensate drain unit
21 Return pipe unit
22 Two-way valve return unit
23 Water return manifold
24 Condensate collector
25 Water ow manifold
26 Delivery probe socket
27 Unit pump / 2-way valve
28 Exhaust ue probe
29 unit switch
30 Control board
31 Terminal strip
32 Display
33 Mains power switch
1.7 Technical specications
Description
Steel Pro Power
114-2
P/V
140-2
P/V
180-2
P/V
230-2
P/V
270-2
P/V
300-3
P/V
345-3
P/V
405-3
P/V
460-4
P/V
540-4
P/V
TYPE OF APPLIANCE
Appliance type Condensing boiler heating system
B23, B53; B53P
Fuel - Device category
IT-GB-GR-IE-PT-SI: G20=20mbar G30/G31=28-30/37mbar; II2H3+
SK: G20=20mbar G30=28-30mbar G31=37mbar; II2H3+
ES: G20=18mbar G30=28-30mbar G31=37mbar; II2H3+
BE: G20/25=20/25mbar; I2E(S)
BE: G30/G31=28-30 /37mbar G31=28-30/37mbar; I3+
MT-CY-IS: G30=30mbar; I3B/P
FR: G20/G25= 20/25mbar G30/G31=28-30/37mbar; II2E+3+
PL-RU: G20=20 mbar G30/G31= 37 mbar (RU=37mbar); II2E3B/P
LU: G20=20 mbar G31=37 mbar; I2E3P
DE: G20/G25=20 mbar G30=50 mbar; II2ELL3B/P
PL: G20=20mbar G27=20mbar G30/G31=37mbar G2.350=13mbar; II2ELwLs3B/P
FR: G20/G25=20/25 mbar G30/G31=28-30/37mbar; II2ESi3+
FR: G20/G25= 20/25mbar G30=28-30mbar; II2ESi3B/P
RO-IE-SI-BG-DK-SK-EE: G20=20mbar G30=30mbar; II2H3B/P
SE-NO-LV-LT-FI-TR: G20=20mbar G30=30mbar; II2H3B/P
HR: G20=20mbar G30/G31=30mbar; II2H3B/P
HU: G20=25mbar G30=30mbar; II2H3B/P
SK-CZ-LU-AT-CH: G20=20mbar G30=50mbar; II2H3B/P
SI-SK: G20=20mbar G31=37mbar; II2H3P
NL: G25=25mbar G30=30mbar; II2L3B/P
Combustion chamber vertical
Flue exhaust homologations B23, B53, B53P, C13(*), C33(*), C53(*), C63(*)
Device category according to UNI
10642 II2H3P

1110
GENERAL INFORMATION GENERAL INFORMATION
Description
Steel Pro Power
U.M.
114-2 P/V 140-2
P/V
180-2
P/V
230-2
P/V
270-2
P/V
POWERS AND EFFICIENCY
Nominal rated heat input (PCI) 114 136 180 223,2 262 kW
Nominal rated heat input (PCS) 126 152 200 248 292 kW
Maximum rated heat output (80°-60°C) G20 111,4 134 176,6 219,6 258 kW
Maximum rated heat output (60-40°C) G20 119,2 142,8 187,6 232,4 274,6 kW
Maximum rated heat output (50-30°C) G20 123,8 147,8 194,8 242,2 284,2 kW
Minimum rated heat input (PCI) G20 13,7 13,7 19,4 22,4 26,3 kW
Minimum rated heat input (PCS) G20 15 15 21,6 24,9 29 kW
Minimum thermal output 80/60°C G20 13,5 13,5 19,2 22,1 26 kW
Minimum thermal output 50/30°C G20 14,9 14,9 21,1 24,5 28,9 kW
Useful efciency at nominal heat output 80-60°C (PCI) 97,72 98,53 98,11 98,40 98,47 %
Useful efciency at minimum heat output 80-60°C (PCI) 98,9 98,9 98,8 99,2 99,1 %
Useful efciency at nominal heat output 50/30°C (PCI) 108,6 108,1 108,3 108,6 108,3 %
Useful efciency at minimum heat output 50/30°C (PCI) 109,3 109,3 109,2 110 110 %
Useful efciency 30% - 50/30°C PCS (PCI) 98,94
(109,36)
97,81
(109,31)
98,00
(108,89)
98,39
(108,93)
98,17
(109,41) %
Combustion efciency 99,0 99,0 99,0 99,3 99,3 %
Chimney losses with burner off 0,1 0,1 0,1 0,1 0,1 %
Chimney losses with burner on P. max. 80-60°C 2,3 2,3 2,5 2,5 2,6 %
Chimney losses with burner on at 30% Pn 50-30°C 0,5 0,5 0,6 0,5 0,6 %
Chimney losses with burner on P. min. 80-60°C 0,12 0,11 0,22 0,1 0,1 %
Losses through the casing with average T 70°C and burn-
er on 0,5 0,5 0,5 0,5 0,5 %
Losses through the casing with average T 70°C and burn-
er off 0,5 0,5 0,5 0,5 0,5 %
Flue gas temperature at max power and min power 80-
60°C 71 - 61 72 - 61 76 - 62 75 - 61 77 - 61 °C
Flue gas temperature at max power and min power 50-
30°C 45 - 33 46 - 33 47 - 35 45 - 33 48 - 35 °C
Air index λat max power G20 1,27 1,27 1,27 1,27 1,27 no.
G31 1,29 1,29 1,29 1,29 1,29 no.
Air index λat min power G20 1,27 1,27 1,27 1,27 1,27 no.
G31 1,29 1,29 1,29 1,29 1,29 no.
Max Flue ow at max-min power G20 53 - 6 64 - 6 84 - 9 104 - 10 122 - 12 g/s
G31 51 - 6 62- 6 82 - 9 101 - 10 119 - 12 g/s
Flue Residual prevalence at min power 35 35 32 30 28 Pa
Flue gas residual head with max power 510 630 560 500 353 Pa
Maximum rated heat input (LCV) G25 106 130 170 214 254 kW
Minimum rated heat input (LCV) G25 13 13 18,1 21,4 24,5 kW
(*) Congurations possible only with the installation of the dedicated accessories (available separately).
Description Steel Pro Power U.M.
114-2 P/V 140-2 P/V 180-2 P/V 230-2 P/V 270-2 P/V
ELECTRICAL DATA
Power supply voltage 230-50 V-Hz
Electric degree of protection IPX4D IP
Electric power consumption of the boiler at max
power 198 264 460 706 964 W
Electric power consumption of the boiler at min
power 92 96 126 198 220 W
Electric power consumption of the pumps at max
power 100 110 160 296 360 W
Electric power consumption of the pumps with min
power 40 44 64 118 144 W
HEATING EXERCISE
Water temperature selection range (with plate heat
exchanger) 20-80/(85)* °C
Lockout thermostat activation temperature 95 °C
Maximum operating temperature 100 °C
Maximum working pressure 6bar
Minimum operating pressure 0,7 bar
Water content 45 45 50 60 75 l
Water side pressure drops with ΔT 20°C "versions V" 102 135 168 356 526 mbar
Residual head on water side with ΔT 20°C "versions
P" 400 280 450 300 500 mbar
Maximum condensation production at maximum
power 50-30°C 17,8 20,2 27,2 35 39,6 l/h
Noise (sound power) 56 58 58 60 61 dB(A)
GAS SUPPLY DATA
Maximum supply gas pressure G20 60 60 60 60 60 mbar
G31 60 60 60 60 60 mbar
Nominal supply gas pressure G20 20 20 20 20 20 mbar
G31 37 37 37 37 37 mbar
Minimum gas supply pressure G20 17 17 17 17 17 mbar
G31 25 25 25 25 25 mbar
DIMENSIONAL DATA
Heating delivery diameter 3” DN80
PN6
3” DN80
PN6
3” DN80
PN6
3” DN80
PN6
5” DN125
PN6 ø DN
Heating return diameter 3” DN80
PN6
3” DN80
PN6
3” DN80
PN6
3” DN80
PN6
5” DN125
PN6 ø DN
Gas inlet diameter 2 "DN50
PN6
2 "DN50
PN6
2 "DN50
PN6
2 "DN50
PN6
3” DN80
PN6 ø DN
Condensate discharge diameter 50 50 50 50 50 ø mm
Coat height 1800 1800 1800 1800 1800 mm
Width of the mantle 900 900 900 900 900 mm
Depth of the coat 890 890 890 890 890 mm
Flue exhaust diameter DN160 DN160 DN160 DN160 DN300 ø mm
Air intake diameter (optional) DN160 DN160 DN160 DN160 DN300 ø mm
(*) Congurations possible only with the installation of the dedicated accessories (available separately).

1312
GENERAL INFORMATION GENERAL INFORMATION
Description
Steel Pro Power
U.M.
300-3
P/V
345-3
P/V
405-3
P/V
460-4
P/V
540-4
P/V
POWERS AND EFFICIENCY
Nominal rated heat input (PCI) 291 334,8 393 446,4 524 kW
Nominal rated heat input (PCS) 324 372 438 496 584 kW
Maximum rated heat output (80°-60°C) G20 285,9 329,4 387 439,2 516 kW
Maximum rated heat output (60-40°C) G20 303,3 348,6 411,9 464,8 549,2 kW
Maximum rated heat output (50-30°C) G20 315,3 363,6 426,3 484,4 568,4 kW
Minimum rated heat input (PCI) G20 19,4 22,4 26,3 22,4 26,3 kW
Minimum rated heat input (PCS) G20 21,6 24,9 29 24,9 29 kW
Minimum thermal output 80/60°C G20 19,2 22,1 26 22,1 26 kW
Minimum thermal output 50/30°C G20 21,1 24,5 28,9 24,5 28,9 kW
Useful efciency at nominal heat output 80-60°C (PCI) 98,25 98,40 98,47 98,40 98,47 %
Useful efciency at minimum heat output 80-60°C (PCI) 98,8 99,2 99,1 99,2 99,1 %
Useful efciency at nominal heat output 50/30°C (PCI) 108,2 108,6 108,3 108,6 108,3 %
Useful efciency at minimum heat output 50/30°C (PCI) 109,2 110 110 110 110 %
Useful efciency 30% - 50/30°C PCS (PCI) 97,84
(108,93)
98,39
(108,93)
98,17
(109,41)
98,39
(108,93)
98,17
(109,41) %
Combustion efciency 99,0 99,3 99,3 99,3 99,3 %
Chimney losses with burner off 0,1 0,1 0,1 0,1 0,1 %
Chimney losses with burner on P. max. 80-60°C 2,6 2,5 2,6 2,5 2,6 %
Chimney losses with burner on at 30% Pn 50-30°C 0,6 0,5 0,6 0,5 0,6 %
Chimney losses with burner on P. min. 80-60°C 0,2 0,1 0,1 0,1 0,1 %
Losses through the casing with average T 70°C and burn-
er on 0,33 0,33 0,33 0,25 0,25 %
Losses through the casing with average T 70°C and burn-
er off 0,33 0,33 0,33 0,25 0,25 %
Flue gas temperature at max power and min power 80-
60°C 78 -62 75 - 61 77 - 61 75 - 61 77 - 61 °C
Flue gas temperature at max power and min power 50-
30°C 49 - 35 45 - 33 48 - 35 45 - 33 48 - 35 °C
Air index λat max power G20 1,27 1,27 1,27 1,27 1,27 no.
G31 1,29 1,29 1,29 1,29 1,29 no.
Air index λat min power G20 1,27 1,27 1,27 1,27 1,27 no.
G31 1,29 1,29 1,29 1,29 1,29 no.
Max Flue ow at max-min power G20 136 - 9 156 - 10 183-12 208-10 245-12 g/s
G31 132 - 9 152-10 179-12 203-10 238-12 g/s
Flue Residual prevalence at min power 32 30 28 30 28 Pa
Flue gas residual head with max power 610 500 353 500 353 Pa
Maximum rated heat input (LCV) G25 279 321 381 428 508 kW
Minimum rated heat input (LCV) G25 18,5 21,4 24,5 21,4 24,5 kW
(*) Congurations possible only with the installation of the dedicated accessories (available separately).
Description
Steel Pro Power
U.M.
300-3
P/V
345-3
P/V
405-3
P/V
460-4
P/V
540-4
P/V
ELECTRICAL DATA
Power supply voltage 230-50 V-Hz
Electric degree of protection IPX4D IP
Electric power consumption of the boiler at max
power 951 1059 1446 1412 1928 W
Electric power consumption of the boiler at min
power 228 297 330 396 440 W
Electric power consumption of the pumps at max
power 342 444 540 592 720 W
Electric power consumption of the pumps with min
power 135 177 216 236 288 W
HEATING EXERCISE
Water temperature selection range (with plate heat
exchanger) 20-80/(85)* °C
Lockout thermostat activation temperature 95 °C
Maximum operating temperature 100 °C
Maximum working pressure 6bar
Minimum operating pressure 0,7 bar
Water content 80 100 120 120 150 l
Water side pressure drops with ΔT 20°C "versions V" 230 356 526 356 526 mbar
Residual head on water side with ΔT 20°C "versions
P" 300 300 300 300 500 mbar
Maximum condensation production at maximum
power 50-30°C 45 52,5 59,4 70 79,2 l/h
Noise (sound power) 60 61 62 63 64 dB(A)
GAS SUPPLY DATA
Maximum supply gas pressure G20 60 60 60 60 60 mbar
G31 60 60 60 60 60 mbar
Nominal supply gas pressure G20 20 20 20 20 20 mbar
G31 37 37 37 37 37 mbar
Minimum gas supply pressure G20 17 17 17 17 17 mbar
G31 25 25 25 25 25 mbar
DIMENSIONAL DATA
Heating delivery diameter 3” DN80
PN6
3” DN80
PN6
5” DN125
PN6
3” DN80
PN6
5” DN125
PN6 ø DN
Heating return diameter 3” DN80
PN6
3” DN80
PN6
5” DN125
PN6
3” DN80
PN6
5” DN125
PN6 ø DN
Gas inlet diameter 2 "DN50
PN6
2 "DN50
PN6
3” DN80
PN6
2 "DN50
PN6
3” DN80
PN6 ø DN
Condensate discharge diameter 50 50 50 50 50 ø mm
Coat height 1800 1800 1800 1800 1800 mm
Width of the mantle 1700 1700 1700 1700 1700 mm
Depth of the coat 890 890 890 890 890 mm
Flue exhaust diameter DN160 DN160 DN300 DN160 DN300 ø mm
Air intake diameter (optional) DN160 DN160 DN300 DN160 DN300 ø mm
(*) Congurations possible only with the installation of the dedicated accessories (available separately).

1514
GENERAL INFORMATION GENERAL INFORMATION
1.8 ERP data
Description
Steel Pro Power
U.M.
114-2 P/V 140-2
P/V
180-2
P/V
230-2
P/V
270-2
P/V
Rated input 114 136 180 223,2 262 kW
Seasonal energy efciency of space heating ηs94 / 94 93 / 93 93 / 93 93 / 93 93 / 93 %
USEFUL HEAT OUTPUT
At rated heat output and at a high
temperature regime P4 G20 114 134 176,6 219,6 258 kW
At 30% of the nominal heat output and
at a low temperature regime P1 G20 37,4 44,6 58,8 73,2 86,6 kW
EFFICIENCY
At rated heat output and at a high temperature regime η4 (PCS) 88,41 88,16 88,3 88,55 88,36 %
At 30% of nominal heat output and at a low temperature regime η1
(PCS) 98,94 97,81 98 98,39 98,17 %
ADDITIONAL ENERGY CONSUMPTION
At full load Elmax 198 / 98 264 / 154 460 /
300 706 / 410 964 /
604 W
At Partial load Elmin 92 / 52 96 / 52 126 / 62 198 / 80 220 / 76 W
In PSB Standby mode 26 / 15 26 / 15 12 / 12 12 / 12 16 / 16 W
OTHER PARAMETERS
Thermal losses in Pstby standby mode 159,16 194,47 255,56 316,64 374,47 W
QHE Annual energy consumption 236 282 364 384 532 GJ
Sound power level within LWA 56 58 58 60 61 dB(A)
Nox oxides emissions Nox (*) 34,2 36,4 38,1 39,3 46,1 mg/kWh
NOx Class 66666n°
Emissions values with minimum ow
(*)
CO less than G20 79 90 81 89 91,5 p.p.m.
G31 142 147 153 177 185
CO2 (**) G20 99999%
G31 10,4 10,4 10,4 10,4 10,4
NOx s.a lower
than
G20 30 30 30 30 30 p.p.m.
G31 40 40 40 40 40
Flue gas T 71 72 76 75 77 °C
Emissions values with minimum ow
(*)
CO less than G20 6,5 6,5 7,5 4,6 5,6 p.p.m.
G31 11 11 12 14 16
CO2 (**) G20 99999 (***) %
G31 10,4 10,4 10,4 10,4 10,4
NOx s.a lower
than
G20 30 30 30 30 30 p.p.m.
G31 40 40 40 40 40
Flue gas T 61 61 62 61 61 °C
Gas consumption (min-max)
G20
2,86÷12,00 2,86÷14,48 4,12÷19,06 4,74÷23,64 5,00÷27,82 mc/h
G30
2,18÷9,16 2,18÷11,06 3,14÷14,56 3,62÷18,04 3,82÷21,24 kg/h
G31
2,14÷9,00 2,14÷10,86 3,08÷14,30 3,56÷17,72 3,74÷20,86 kg/h
(*) Weights calculated according to EN 15502.
(**) Values referred to atmospheric pressure at sea level.
(***) To adjust the STEEL PRO POWER 270-2 P model in Belgium and Switzerland, please refer to the chapeter "Adjustments“.
Description
Steel Pro Power
U.M.
300-3
P/V
345-3
P/V
405-3
P/V
460-4
P/V
540-4
P/V
Rated input 291 334,8 393 446,4 524 kW
Seasonal energy efciency of space heating ηs93 / 93 93 / 93 93 / 93 93 / 93 93 / 93 %
USEFUL HEAT OUTPUT
At rated heat output and at a high temperature
regime P4 G20 285,9 329,4 387 439,2 516 kW
At 30% of the nominal heat output and at a low
temperature regime P1 G20 95,1 109,8 129 146,4 172 kW
EFFICIENCY
At rated heat output and at a high temperature regime η4 (PCS) 88,24 88,55 88,36 88,55 88,36 %
At 30% of nominal heat output and at a low temperature regime η1 (PCS) 97,84 98,39 98,17 98,39 98,17 %
ADDITIONAL ENERGY CONSUMPTION
At full load Elmax 951 /
609
1059 /
615
1446 /
906
1412 /
820
1928 /
1208 W
At Partial load Elmin 228
/93
297 /
120
330 /
114
396 /
160
440 /
152 W
In PSB Standby mode 18 / 18 18 / 18 24 / 24 24 / 24 32 / 32 W
OTHER PARAMETERS
Thermal losses in Pstby standby mode 414,19 474,96 561,71 636,09 748,95 W
QHE Annual energy consumption 588 678 798 904 1064 GJ
Sound power level within LWA 60 61 62 63 64 dB(A)
Nox oxides emissions Nox (*) 38,7 39,3 46,1 39,3 46,1 mg/kWh
NOx Class 66666 n°
Emissions values with minimum ow (*)
CO less than G20 91,5 89 91,5 89 91,5 p.p.m.
G31 163 177 185 177 185
CO2 (**) G20 99999 %
G31 10,4 10,4 10,4 10,4 10,4
NOx s.a low-
er than
G20 30 30 30 30 30 p.p.m.
G31 40 40 40 40 40
Flue gas T 78 75 77 75 77 °C
Emissions values with minimum ow (*)
CO less than G20 7,5 4,6 5,6 4,6 5,6 p.p.m.
G31 12 14 16 14 16
CO2 (**) G20 9 (***) 99 (***) 99 (***) %
G31 10,4 10,4 10,4 10,4 10,4
NOx s.a low-
er than
G20 30 30 30 30 30 p.p.m.
G31 40 40 40 40 40
Flue gas T 62 61 61 61 61 °C
Gas consumption (min-max)
G20
6,18÷30,87 7,11÷35,46 7,50÷41,73 9,48÷47,28 10,00÷55,64 mc/h
G30
4,71÷23,58 5,43÷27,06 5,73÷31,86 7,24÷36,08 7,64÷42,48 kg/h
G31
4,62÷23,16 5,34÷26,58 5,61÷31,29 7,12÷35,44 7,48÷41,72 kg/h
(*) Weights calculated according to EN 15502.
(**) Values referred to atmospheric pressure at sea level.
(***) To adjust the STEEL PRO POWER 540-4 P, STEEL PRO POWER 300-3 P and STEEL PRO POWER 405-3 P models in Belgium and
Switzerland, please refer to the chapter “Adjustments”.

1716
GENERAL INFORMATION GENERAL INFORMATION
1.9 Pumps
The models equipped with a pump have the following headform curves for each single module:
Residual head (mbar)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
0 3 4 5 6 7 821
Steel Pro Power 230-2P
Steel Pro Power 345-3P
Steel Pro Power 460-4P
Steel Pro Power 270-2P
Steel Pro Power 405-3P
Steel Pro Power 540-4P
Steel Pro Power 180-2P
Steel Pro Power 300-3P
Steel Pro Power 114/140-2P
Flow-rate (m3/h)
9 At the rst start-up, and at least once a year, the rotation of the circulator shaft should be checked as, especially after long
periods of not being operated, deposits and/or residuals could impede its free rotation.
9 Before loosening or removing the circulator cap, protect the electric devices located underneath from any water that exits.
0 It is prohibited to operate the circulators without water.
The models with valve have the following load losses:
Water-side pressure drop
Pressure drop (mbar)
0
100
200
300
400
500
600
700
800
900
1000
0 345678 921
Steel Pro Power 114/140-2V
Steel Pro Power 180-2V
Steel Pro Power 300-3V
Steel Pro Power 230-2V
Steel Pro Power 345-3V
Steel Pro Power 460-4V
Steel Pro Power 270-2V
Steel Pro Power 405-3V
Steel Pro Power 540-4V
Flow-rate (m3/h)

1918
GENERAL INFORMATION GENERAL INFORMATION
1.10 Water circuit
9
RI
1 876 1 876
2
3
5
RI
MI
MI
10 11
4
9
2
3
5
1 Heat exchanger
2 Pump (only for "P" models)
3 Drain cock
4 Minimum pressure switch
5 NTC return probe
6 NTC delivery probe
7 Safety thermostat temperature sensor
8 Automatic bleed valve
9 Flow-meter
10 Water return manifold
11 Water ow manifold
MI Central heating ow
RI Central heating return
Values of NTC probes' resistors with changing temperatures.
Temperature °C
Tolerance test ±10% Resistor ΩTemperature °C
Tolerance test ±10% Resistor Ω
-40 191908 45 4904
-35 146593 50 4151
-30 112877 55 3529
-25 87588 60 3012
-20 68471 65 2582
-15 53910 70 2221
-10 42739 75 1918
-5 34109 80 1663
027396 85 1446
522140 90 1262
10 17999 95 1105
15 14716 100 970
20 12099 105 855
25 10000 110 755
30 8308 115 669
35 6936 120 594
40 5819 125 529
1.11 Positioning the temperature sensors
Probes placed on the related sockets of the thermal module:
1 Exhaust ue probe
2 Safety thermostat
3 CH ow temperature sensor
4 Return probe
3
4
1
2
Left view Right view