ICI Caldaie REX F 7 Service manual

REX_7_130_F_en_05 - 01/2021
EN
PRESSURISED STEEL BOILERS
REX 7 ÷ 130 F
INSTALLATION, USE AND MAINTENANCE MANUAL
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

2
INDEX
SYMBOLS USED IN THE MANUAL
aDANGER
To indicate actions that, if not performed correctly, can result in injury of generic origin or may generate malfunction
or damage to the appliance; therefore require particular caution and adequate preparation.
dIT IS FORBIDDEN
To indicate operations that SHOULD NOT be performed.
mIMPORTANT
To indicate particularly useful information and important.
The illustrations and data presented are not binding. The company reserves the right to make without prior notice any changes it
deems appropriate for continuous improvement and constant updating.
General information
3 Introduction
3 Range
3 Compliance
3 Warranty
4 Warnings
4 Prohibitions
5 Hazards
5 Identification
6 Appliance description
6 Structure
7 Optional control panel
8 Dimensions and connections
9 Technical data
10 Control panel
10 Burners
Installation
11 Product receipt
12 Handling
12 Installation room
13 System cleaning
13 Hydraulic connections
13 Starting hydraulic circuit
14 Flue gas discharge and combustion air suction
15 Front door opening
16 Front door adjustment
16 Turbulator assembly
17 Insulating casing assembly
18 Bulb fastening
19 Burner assembly
19 Electrical connections
20 Water treatment
21 System filling and emptying
Use
22 Preliminary checks
22 Commissioning
22 Checks after commissioning
24 Stop periods
24 Decommissioning of old appliances
Maintenance
25 Boiler
26 Burner
27 Any anomalies and remedies
27 Environmental protection and disposal
28 Exploded views of drawings
Useful information and declarations
29 QR code
30 Declaration of Conformity
Notes
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

General information 3
1 General information
INTRODUCTION
Dear Customer,
Thank you for having chosen an appliance of the series REX F , a high quality and efficiency product, reliable and safe.
We recommend entrusting its maintenance to Professionally Qualied Personnel who, when necessary, uses original spare parts.
This manual contains important information and suggestions that must be observed for easier installation and best possible use
of the appliance.
mIMPORTANT
Failure to observe the instructions in this manual will void the warranty conditions.
RANGE
MODEL CODE
REX F 7* 83801210
REX F 8* 83801220
REX F 9* 83802210
REX F 10* 83802220
REX F 12* 83802230
REX F 15* 83803210
REX F 20* 83803220
REX F 25* 83804210
REX F 30* 83805210
REX F 35* 83806210
REX F 40 83807210
REX F 50 83808210
REX F 62 83809210
REX F 75 83810210
REX F 85 83810220
REX F 95 83811210
REX F 100 83812210
REX F 120 83812220
REX F 130 83812230
* Product not compliant with the requirements set
out in the European regulations No. 811-813/2013
and therefore not suitable for the installation on the
EU territory for plant rooms or produce domestic
hot water.
The product can be supplied only for the installation
in non-European Union countries for any kind of
application
COMPLIANCE
REX F boilers comply with the following European Directives:
–European Regulation on Gas Equipment GAR 2016/426/EU
–Low Voltage Directive 2014/35/EU
–Electromagnetic Compatibility Directive 2014/30/EU
–Efficiency Directive 92/42/EEC
–Energy efficiency 
NOTE
The serial number is indicated on the boiler technical nameplate.
WARRANTY
The warranty conditions for boilers series REX F are included in the CONSTRUCTION - WARRANTY CERTIFICATE supplied with the
product.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

General information4
WARNINGS
mIMPORTANT
–The appliance must be used for the purposes for which it has been expressly designed and any manufacturer’s liability shall
be excluded in case of damage to persons, animals or property due to insufficient maintenance or improper use.
–This manual is an integral part of the boiler and must be carefully read before installation and commissioning of the
appliance. Moreover, it must be carefully stored for subsequent consultations and must ALWAYS accompany the boiler
during its entire life-cycle (from installation to disposal). In case of damage or loss, request a copy from
ICI CALDAIE S.p.A.
Technical Assistance Service.
–The appliance is delivered in several separated packages. Upon receipt, check that the supply is intact and undamaged and
promptly contact the
ICI CALDAIE S.p.A. if it does not correspond to the order.
–The installation of
REX F boilers must be performed by a Certified Body which, at the end of the operation, must provide
the owner with the declaration of conformity certifying that the installation has been correctly carried out, namely in
compliance with the Standards and the national and local Laws in force, and with the indications included in the instruction
manuals supplied by ICI CALDAIE S.p.A. .
–The maintenance of the appliance is a legislative obligation. The User must have it carried out by an Authorised Company
or by qualified personnel (maintenance technician) in compliance with the requirements of the local Standards in force.
–Ordinary and extraordinary maintenance must be carried out by qualified personnel in order to promptly detect any
damage to the boiler body under pressure and to the safety and control accessories.
–The boiler is used to heat water at a temperature lower than the boiling temperature at atmospheric pressure and must
be connected to a heating and/or domestic hot water production system, within the limits of its performance and power.
PROHIBITIONS
dIT IS FORBIDDEN
–Operate electrical devices or appliances such as switches, household appliances, etc. if you smell fuel or unburnt materials.
In this case:
- ventilate the room by opening doors and windows
- close the fuel shut-off device
- ask the Technical Assistance Service or qualified personnel to intervene as soon as possible.
–Any technical or cleaning operation carried out before disconnecting the appliance from the power supply mains, by
positioning the system main switch and the control panel main switch to “OFF”.
–Modifying safety or adjustment devices without the boiler manufacturer’s authorisation and indications.
–Plug or dimensionally reduce the ventilation openings of the installation room. The ventilation openings are essential for
proper combustion.
–Exposing the boiler to atmospheric agents. It is not designed to operate outdoor and it does not feature automatic anti-
freeze systems.
–Leave flammable substances and containers in the room where the appliance is installed.
–Disperse the packaging material in the environment and leave it within the reach of children as it may be a potential source
of danger. It must be disposed of in accordance with the legislation in force.
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General information 5
HAZARDS
aDANGER
–In case of water leakages, disconnect the boiler from the power supply mains, close the water supply and contact, as soon
as possible, the Technical Assistance Service Authorised by ICI CALDAIE S.p.A. or qualified personnel.
–Sensing the presence of fuel in the thermal power plant, it is appropriate to follow the precautions below to avoid the risk
of explosions and fires:
-
do not smoke or cause sparks
- do not turn on lights or electrical devices in general (mobile phones)
- open doors and windows
- close the fuel shut-off valve normally placed outside the thermal power plant
- disconnect the power supply by means of the switch which is usually located outside of the plant room.
–During the normal operation, the appliance has hot parts, such as the channel and the flue gas box, which in case of
accidental contact without appropriate personal protection can cause severe burns.
–An incorrect adjustment of the closing door or an insufficient chimney draught can cause the presence of smoke inside
the heating plant room, leading to fatal intoxications due to carbon monoxide, which is by nature colourless and odourless.
Therefore, make sure that the boiler is correctly adjusted and installed and that the heating plant room features vents
compliant with the standards in force.
IDENTIFICATION
Each REX F boiler can be identified through the construction plate (1) inside the envelope of the documents supplied with the
boiler, which includes technical/efficiency information such as:
–serial number or identification marking
–heat input in kW
–nominal thermal flow in kW
–types of fuels which can be used
–maximum operating pressure.
–CE marking
mIMPORTANT
The boiler installer MUST apply the construction plate, at the end of installation, in the front upper side of one of the
side panels of the cover, so that it can be easily identified and read. In case of loss, request a copy to the Technical
Assistance Service of ICI CALDAIE S.p.A. providing the serial number indicated in the CONSTRUCTION CERTIFICATE -
WARRANTY or the sale delivery note.
The appliance is also accompanied by construction certicate attesting the successful result of the hydraulic test.
mIMPORTANT
The installation must be performed in compliance with the local standards by qualied personnel , namely by
personnel with specific technical skills in the field of the heating system components. An incorrect installation may
cause damage to persons or property for which the manufacturer will not be liable.
During commissioning check the effectiveness of all adjustment and control devices in the control panel.
The warranty validity is subject to compliance with the instructions in this manual.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

General information6
APPLIANCE DESCRIPTION
High-efficiency ICI CALDAIE S.p.A. REX F steel boilers must be used for heating systems with water temperature within 60° and
100°C and/or in a system for domestic hot water production, within the limits of their performance and power.
The chosen control panel should be equipped with a safety thermostat with manual reset from 110°C.
They have been provided with cylindrical furnace with reverse flame closed at the back by a fully wet convex bottom, supported
by a stub and that can be coupled with forced draft burners.
Some of the main characteristics of the equipment are listed below:
–boiler body made in quality steel, made up by the front tube plate flanged towards the furnace with RSB process and by the
convex, instead of flat, rear plate, for better resistance to the internal pressure, with laser-cut holes
–cylindrical combustion chamber, with reverse flame, closed at the back with fully wet convex bottom, supported by a stub.
The flame runs through the central part, while the hot gases return peripherally to the front, partially wet, part to be conveyed
to the tube bundle
–EN10217-2 P235GH fire tubes, welded to the front and rear tube plates, equipped with helical turbulators
–rear smokebox made in steel metal sheet, consisting of a single piece that can be easily opened to inspect the fire tubes,
fastened by means of bolts, complete with chimney fitting and cleaning door
–containment tube bundle equipped with connections necessary for the system and the operating equipment, all welded
with approved processes carried out by qualified welders
–casing made with easily removable painted steel panels, that protect the insulation made with high-density fibreglass wool
mats
–front door made in steel metal sheet thermally insulated with ceramic fibre, fitted on hinges, that can be easily opened by
means of drilled ring nuts and with supplied lever.
mIMPORTANT
REX F boilers have finned extruded parts in aluminium (Pat. Fin-e) inserted into the fire tubes. They can be used ONLY
with gaseous fuels.
STRUCTURE
1 2 12
N2
N3 N5 N5
N1
N4
789
4
N6
5
6
N7
10
3
N8
1 Control panel (accessory)
2 Front door
3 Flame inspection window
4 Rear smokebox
5 Flue gas drain fitting
6 Inspection door
7 Insulating casing
8 Door hinges
9 Burner (accessory)
10 Burner support flange
N1 Boiler flow fitting
N2 Boiler return fitting
N3 Instruments fitting
N4 System intake/drain fitting
N5 Safety valve(s) fitting
N6 Bulb-holder pockets
N7 Condensate drain fitting
N8 Control pocket
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General information 7
OPTIONAL CONTROL PANEL
The (optional) control panel, made of plastic with protection grade IP40, contains the regulation and safety instruments:
The upper casing of the control panel can rotate to access the terminal board and unwind the capillary tubes of thermostats and
thermometers.
The regulation thermostats have an operating range from 60°C to 100°C and can be calibrated by the user by means of the front
knob.
The safety thermostat has a fixed calibration of 110°C and a manual reset as required by the regulations.
The circulation pump enabling thermostat located inside the panel can be adjusted from 0°C to 90°C with a tool and is factory-set
to 50°C, its activation differential is 6°C. Thanks to this thermostat, the circulation pump remains stopped when the temperature
is lower than 50°C to avoid the hazardous flue gas condensation.
1 2
3
6
4
5
7
KEY
1 NETWORK LIGHT
2 BURNER SWITCH NO. 1
3 SYSTEM CIRCULATION PUMP SWITCH
4 BOILER THERMOMETER
5 LIMIT REGULATION THERMOSTAT
6 SAFETY THERMOSTAT
7 HIGH/LOW FLAME THERMOSTAT
WIRING DIAGRAM
See the diagram inside the electric panel.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

General information8
DIMENSIONS AND CONNECTIONS
175H1
H
H2
ØcH10
H6
Øb
P6
L2
L
P2
H4
P5P4P3
P
N2
N3 N5 N5
N1
N4
N7
N8
N6
Dimensions
Description u.m.
REX F
7* 8* 9*
10* 12* 15* 20* 25* 30* 35* 40 50 62 75 85 95 100 120 130
H mm 1063 1063 1030 1030 1030 1080 1080 1080 1180 1180 1190 1380 1380 1510 1510 1510 1660 1660 1660
H1 mm 853 853 855 855 855 905 905 905 1005 1005 1015 1205 1205 1335 1335 1335 1485 1485 1485
H2 mm 415 415 415 415 415 440 440 440 490 490 500 610 610 675 675 675 750 750 750
H4
mm 912 912 912 912 912 962 962 962 1061 1061 1095 1285 1285 1417 1417 1417 1568 1568 1568
H6 mm 415 415 415 415 415 440 440 440 490 490 500 610 610 675 675 675 750 750 750
H10
mm 54,5 54,5 54,5 54,5 54,5 54,5 54,5 54,5 54,5 54,5 50 60 60 60 60 60 60 60 60
L
mm 756 756 756 756 756 806 806 806 906 906 946 1166 1166 1296 1296 1296 1446 1446 1446
L2 mm 700 700 700 700 700 750 750 750 850 850 890 1110 1110 1240 1240 1240 1390 1390 1390
P mm 994 994 1119 1119 1119 1364 1364 1614 1614 1864 1872 1946 2235 2247 2247 2497 2477 2477 2477
P2 mm 630 630 755 755 755 1000 1000 1250 1250 1500 1502 1502 1792 1753 1753 2003 2003 2003 2003
P3 mm 413 413 513 513 513 513 513 513 523 523 600 663 663 704 704 704 703 703 703
P4
mm 240 240 265 265 265 475 475 725 700 980 850 850 1150 1100 1100 1200 1200 1200 1200
P5 mm 341 341 341 341 341 376 376 376 391 361 422 433 422 443 443 593 574 574 574
P6
mm
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
230-
280
270-
320
270-
320
270-
320
270-
320
270-
320
270-
320
270-
320
270-
320
Øb
mm 130 130 130 130 130 160 160 160 180 180 225 225 225 280 280 280 280 280 280
Øc
mm 200 200 200 200 200 250 250 250 250 250 250 300 300 350 350 350 400 400 400
For BIOGAS generators, add 40 mm to measurement P6
Fittings
Description u.m.
REX F
7* 8* 9*
10* 12* 15* 20* 25* 30* 35* 40 50 62 75 85 95 100 120 130
N1
DN/
in
50 50 50 50 50 50 50 50 65 65 80 80 80 100 100 100 125 125 125
N2
DN/
in
50 50 50 50 50 50 50 50 65 65 80 80 80 100 100 100 125 125 125
N1/N2 PN6666666666666666666
N3
DN/
in
1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
N4
DN/
in
1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4
N5
DN/
in
----------
1”1/4
(*) 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4
N6
DN/
in
1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2”
N7
DN/
in
1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2”
N8
DN/
in
1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2” 1/2”
(1)One single connection
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General information 9
TECHNICAL DATA
DESCRIPTION u.m. REX F
7* 8* 9* 10* 12* 15* 20* 25* 30* 35*
Effective rated
[1]
kW 70 80 90 100 120 150 200 250 300 350
Flow thermal kW 74,2 84,7 95,2 105,6 126,5 157,8 210 263,5 315,5 367
Efficiency at 100% (ref. P.C.I.)
[1]
% 94,34 94,45 94,54 94,7 94,86 95,06 95,24 94,88 95,09 95,37
Efficiency of 100% (stars)
[2]
% *** *** *** *** *** *** *** *** *** ***
Max gas flow rate - G20 Stm3/h 7,85 8,96 10,07 11,17 13,39 16,7 22,22 27,88 33,39 38,84
Max gas flow rate - G30 kg/h 5,83 6,65 7,48 8,29 9,94 12,39 16,49 20,69 24,78 28,82
Max gas flow rate - G31 kg/h 5,76 6,58 7,4 8,2 9,83 12,26 16,31 20,47 24,51 28,51
Max flue gas flow rate kg/h 116,97 133,5 150,04 166,43 199,51 248,83 331,08 415,41 497,51 578,72
Efficiency at 30% (ref. N.C.V.)
[1]
% 94,8 94,7 95 94,8 95,1 95,7 95,3 95,38 95,59 95,6
Flue gas pressure drop mbar 0,9 1,1 0,9 1,1 1,3 1,3 2,2 2,4 2,4 3,4
Heat losses through the chimney % 5,16 5,05 4,96 4,8 4,64 4,44 4,26 4,62 4,41 4,13
Heat losses through the casing % 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5
Heat losses with burner off % 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1
Flue gas temperature (Nom. output, air = 20°C) - GAS °C 148 146 143 140 136 131 127 135 130 124
CO
2
- GAS % 11 11 11 11 11 11 11 11 11 11
Fluid pressure drop (ΔT=12K) mbar 8 10 13 16 23 35 63 98 50 67
Nominal pressure bar5555555555
Total weight Kg 222 222 266 266 266 357 357 442 489 558
Total capacity l 105 105 123 123 123 172 172 220 300 356
Rated frequency ~ voltage
Volt ~
Hz 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50
Electric protection rating IP 40 40 40 40 40 40 40 40 40 40
Absorbed power
[3]
W 20 20 20 20 20 20 20 20 20 20
Allowed fuels methane gas-LPG
DESCRIPTION u.m. REX F
40 50 62 75 85 95 100 120 130
Effective rated
[1]
kW 420 500 620 750 850 950 1020 1200 1300
Flow thermal kW 441 524 649 786 891 997 1069 1259 1364
Efficiency at 100% (ref. P.C.I.)
[1]
% 95,24 95,42 95,53 95,42 95,4 95,29 95,42 95,31 95,31
Efficiency of 100% (stars)
[2]
%***--------
Max gas flow rate - G20 Stm3/h 46,67 55,45 68,68 83,17 94,29 105,5 113,12 133,23 144,34
Max gas flow rate - G30 kg/h 34,64 41,15 50,97 61,73 69,98 78,3 83,96 98,88 107,13
Max gas flow rate - G31 kg/h 34,26 40,71 50,42 61,06 69,22 77,45 83,05 97,81 105,97
Max flue gas flow rate kg/h 695,38 826,21 1023,33 1239,23 1404,92 1571,95 1685,49 1985,13 2150,67
Efficiency at 30% (ref. N.C.V.)
[1]
% 95,4 95,7 95,9 95,92 95,8 95,79 95,8 95,81 95,7
Flue gas pressure drop mbar 5,2 4,8 7,3 5,8 8 5,9 4,5 6,2 7,3
Heat losses through the chimney % 4,26 4,08 3,97 4,08 4,1 4,21 4,08 4,19 4,19
Heat losses through the casing % 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5
Heat losses with burner off % 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1
Flue gas temperature (Nom. output, air = 20°C) - GAS °C 127 122 120 122 123 126 122 125 125
CO
2
- GAS % 11 11 11 11 11 11 11 11 11
Fluid pressure drop (ΔT=12K) mbar 42 60 92 55 71 89 42 58 68
Nominal pressure bar555555555
Total weight Kg 600 871 981 1230 1230 1446 1880 1880 1880
Total capacity l 360 540 645 855 855 950 1200 1200 1200
Rated frequency ~ voltage
Volt ~
Hz 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50 230 ~ 50
Electric protection rating IP 40 40 40 40 40 40 40 40 40
Absorbed power
[3]
W 20 20 20 20 20 20 20 20 20
Allowed fuels methane gas-LPG
[1] Average temperature 70°C.
[2] Efficiency Directive 92/42/EEC.
[3] With electronic control unit (circulator and burner excluded).
* Product not compliant with the requirements set out in the European regulations No. 811-813/2013 and therefore not suitable
for the installation on the EU territory for plant rooms or produce domestic hot water.
The product can be supplied only for the installation in non-European Union countries for any kind of application
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

General information10
CONTROL PANEL
The control panels which can be installed on REX F boilers are mentioned in the table.
They must be ordered separately from the boiler and for to their technical and installation characteristics refer to the manual
provided with the panel.
To choose the most appropriate control panel for the system refer also to the CATALOGUE , and to use it refer to the manual
supplied with the control panel.
Description Code
Thermostatic control panel QACC10ELMCE
eterm boiler control panel QETERM01CE
eterm system control board QETERM02
BURNERS
The burners that can be installed on the REX F boilers must be CE marked according to European Directives:
–European Regulation on Gas Equipment GAR 2016/426/EU
–Electromagnetic Compatibility Directive 2014/30/EU
–Low Voltage Directive 2014/35/EU
–Machinery Directive 2006/42/EC (for liquid fuel burners)
They must also be able to operate on boilers with flame inversion combustion chamber.
Since the optimal operation of the boiler depends on the correct selection of the burner and its adjustment, find below some
points to take into account:
–The firing range of the burner must include the boiler operating point (flow-back pressure in combustion chamber
considering the pressure at the base of the chimney as ZERO)
–the length of the combustion head must be adequate to the penetration into the combustion chamber provided by ICI and
shown in the table
–the length and shape of the flame must be suitable to the flame inversion combustion chambers. The burner manufacturers
have this information as they are required by certification.
Øb
P6
Description U/M
REX F
7* 8* 9* 10* 12* 15* 20* 25* 30* 35* 40 50 62 75 85 95 100 120 130
Øb mm 130 130 130 130 130 160 160 160 180 180 225 225 225 280 280 280 280 280 280
P6 mm 200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
200-
250
230-
280
270-
320
270-
320
270-
320
270-
320
270-
320
270-
320
270-
320
270-
320
For BIOGAS generators, add 40 mm to measurement P6
dPROHIBITION
Do not use burners for liquid fuels.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation 11
2 Installation
PRODUCT RECEIPT
REX F boilers are supplied in two different packages:
–the BOILER BODY , positioned on a wooden support, with the document envelope (1) that contains:
-adhesive nameplate
-instruction manual
-construction certificate and warranty
–the COVER complete with all assembly components and the heat insulating mat to be applied around the flame pipe of the
burner.
Inside the combustion chamber there is the turbulator unit to be inserted in the fire tubes during boiler installation.
1
mIMPORTANT
The instruction manual is an integral part of the appliance and it MUST be carefully read before installing and
commissioning the boiler, carefully stored for further consultations and it MUST always accompany the boiler.
mIMPORTANT
The control panel must be ordered separately from the boiler and is supplied in a separate package.
mIMPORTANT
The mat of boilers from 7* to 40 is positioned outside the appliance: for all other models, it is inserted inside the
combustion chamber.
mIMPORTANT
PACKAGING: as for the package, ICI CALDAIE S.p.A. complies with the specific recycling systems of each country,
ensuring an optimal reuse of them. All the materials used for the packaging respect the environment and can be
recycled, such as wood, plastic, cardboard.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation12
HANDLING
REX F boilers are equipped with fittings for lifting operations and, in any case, they must be carefully moved with equipment
suitable for their dimensions and weights.
aATTENTION
The Personal Protective Equipment required by current legislation must be used.
INSTALLATION ROOM
The REX F boiler installation room must be for exclusive use, meet the Technical Standards and Legislation in force and equipped
with adequately sized ventilation openings.
The spaces around the boiler and towards the ceiling must be suitable for:
–installing the appliance
–reaching the safety devices
–maintenance
–repairing any breakage
–opening the door of the installed burner, considering its opening direction (towards the right or the left)
It is recommended to position the boiler, if possible, lifted from the floor to minimise dust extraction by the burner fan.
A (*)
P2
≥ 90°
> 600 mm
NO!
(*) A ≥ P2 (see "Size and fittings*)
mIMPORTANT
–The front space (A) must be greater than the boiler length to be able to extract the turbulators or replace a fire tube in
case of breakage.
–In the case of several boilers installed in the same room, check the accessibility to the most remote boiler to be able to
perform ordinary and extraordinary maintenance.
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Installation 13
aATTENTION
–Consider the spaces necessary to access the adjustment and safety devices and to perform maintenance.
–If the burner is fed with gas of specific weight greater than that of the air, the electrical parts must be positioned at least
500 mm from the ground.
SYSTEM CLEANING
Before connecting the boiler to the system, it is RECOMMENDED to wash the pipes thoroughly in order to remove any residues
which may compromise the correct operation of the boiler.
HYDRAULIC CONNECTIONS
STARTING HYDRAULIC CIRCUIT
The hydraulic circuit must be built by an authorised company or by qualified personnel, in compliance with theTechnical Standards
and the Law in force.
The components shall be charged to the installer that, at the end of the works, must issue a declaration of conformity.
mIMPORTANT
ICI CALDAIE S.p.A. is not liable for any harm to people, animals or property damage caused by errors in the choice of
components or in the construction of the plant.
mIMPORTANT
–Make sure that the hydraulic pressure measured downstream of the pressure regulator on the supply line does not
exceed the operating pressure indicated on the boiler nameplate.
–Make sure that the drains of the safety valves of the boiler and the heater, if any, are connected to a drain funnel, so that
the valves do not flood the room in case of intervention.
–Make sure that the water and heating system pipes are not used as earthing point of the electrical system.
–Once the heating system has been filled, it is recommended to close the supply tap and keep it closed so that any
system losses can be signalled by an hydraulic pressure drop detected on the system manometer.
–For reasons of technical expertise, the system components must be chosen and installed by the installer, that must
operate in accordance with good practice regulations and Laws in force.
WATER CIRCULATION
The temperature difference between flow and return must not exceed 30°C in order to avoid thermal shocks to the boiler. The
return temperature from the system must be higher than 50°C (with exclusive methane gas or LPG operation) in order to protect
the boiler from corrosion due to acid flue gas condensate.
The warranty does not cover any damage caused by the condensate.
It is useful to mitigate the return temperature by installing a mixing valve and/or a recirculation pump.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation14
FLUE GAS DISCHARGE AND COMBUSTION AIR SUCTION
The smoke duct and the connection to the chimney must be built in compliance with the Standards and the Laws in force, with
rigid pipes, resistant to the temperature, condensate, mechanical stresses and sealed.
mIMPORTANT
The smoke duct must have a diameter equal to or larger than the boiler fitting.
Indicative diagram
Ø C
H6
Description u.m.
REX F
7* 8* 9*
10* 12* 15* 20* 25* 30* 35* 40 50 62 75 85 95 100 120 130
H6 mm 415 415 415 415 415 440 440 440 490 490 500 610 610 675 675 675 750 750 750
Ø C
mm 200 200 200 200 200 250 250 250 250 250 250 300 300 350 350 350 400 400 400
aDANGER
–the chimney must ensure the draught necessary for the boiler operation and provided for by the Technical Standards in
force, considering a “zero” pressure at the connection with the smoke duct
–unsuitable or badly dimensioned chimneys and smoke ducts can cause condensation problems and adversely affect
the combustion parameters
–non-insulated drain pipes can lead to a potential risk and the tightness of the joints must be ensured with materials
resistant to the temperatures of the drain flue gases (we recommend at least 250°C)
–check that the chimney has a suitable draught, does not feature chokes and is clear from debris; check that no drains of
other equipment are connected to the chimney (unless this has been made to serve several utilities).
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation 15
FRONT DOOR OPENING
The door is adjusted in the factory with standard opening to the left (Sx) and hinges on the right (Dx).
aDANGER
It is DANGEROUS TO UNSCREW the ferrules (8) on the side of the hinges. This may cause the door to detach, with
possible serious harm to people and property damage.
DOOR OPENING REVERSAL (TO THE RIGHT)
4
1
9
23
6
5
8
7
Dx
Sx
NOTE
The ferrules (8) can be "adjusted with wrench" or "perforated for lever adjustment".
DOOR WITH FERRULES PERFORATED ON BOTH SIDES
Proceed as follows to reverse the opening direction of the door:
–screw the left perforated ferrules (1) so that the door seal gasket is pressed in the same way as the right part. Bring the conical
washers (2) of the left tie-rods close to the mechanical tubes (3) of the door and tighten the nuts (4) using a suitable wrench
–on the right opening side, loosen the nuts (5) and free the conical washers (6) from the mechanical tubes (7) of the door.
DOOR WITH WRENCH FERRULES, HINGE SIDE
aDANGER
In models equipped with wrench-adjustable ferrules (8), these must always be mounted on the hinges to prevent the
door from being accidentally opened through the lever (9).
Proceed as follows to reverse the opening direction of the door:
–screw the left perforated ferrules (1) so that the door seal gasket is pressed in the same way as the right part. Bring the conical
washers (2) of the left tie-rods close to the mechanical tubes (3) of the door and tighten the nuts (4) using a suitable wrench
–cross-change the wrench ferrule of a hinge (8) with the opposite perforated ferrule (1), after loosening the locking nuts on the
tie rods and freeing the conical washers
–on the left hinge side, fasten the conical washer (2) onto the door using the nut (4s)
–repeat the last two steps for the other two ferrules also.
aDANGER
When cross-changing ferrules, always make sure that the other two ferrules are fastened, so that they hold the door.
Check the correct adjustment of the tie-rods and hinges ensuring that, during closure, the seal gasket is evenly pressed in the
centre on the whole circumference. If necessary, adjust the door as described in the following paragraph.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation16
FRONT DOOR ADJUSTMENT
aDANGER
Incorrect door adjustment with consequent damage to people and property voids the warranty conditions.
DOOR ADJUSTMENT (OPENING ON THE RIGHT)
123
6
45
7
Dx
Sx
VERTICAL ADJUSTMENT
To make the adjustment:
–with the door ajar, loosen the counter-nuts (1) of the hinge units
–act on the adjustment nuts (2) to lift or lower the door by centring the gasket on the stop plate, then block the counter-nuts
(1)
–close the door and centre the tie-rod (4) on the mechanical tube (5), proceeding as in the previous point.
HORIZONTAL ADJUSTMENT
Close the door using the lever and check that there is equal distance on both sides, between the stop plate and the band. If this
is not the case:
–with the door ajar, loosen the locking nuts (6) of the hinge units
–act on the ferrule (7) to adjust the distance depth-wise
–screw the nuts (6) and block the conical washers on the mechanical tubes.
aDANGER
When cross-changing ferrules, always make sure that the other two ferrules are fastened, so that they hold the door.
Check the proper adjustment in depth ensuring that the door, manually pushed up to the stop plate, naturally returns remaining
ajar. This is to ensure the hinge side fume seal.
TURBULATOR ASSEMBLY
To assemble the turbulators supplied with the boiler, open the door and insert the turbulators completely into the smoke pipes,
until they penetrate by at least 100 m.
100 mm
aDANGER
The turbulators have very pointed and sharp ends. Therefore, wear suitable protective gloves during insertion
(equipment according to current regulation).
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation 17
INSULATING CASING ASSEMBLY
To fit the insulating casing proceed as follows:
–wrap the heat insulating mat around the boiler body and fasten it with the supplied strap (1)
–prepare the slats (2) inserting the locking plugs (3) in the corners of each one of them, as shown in the figure below
1
2
3
–fasten the uprights and the crosspieces (4) to the plates (5) with the screws and nuts supplied as standard
mIMPORTANT
the crosspiece (6), if included in the package, must be positioned between the two square pipes to support the slats.
5
4
4
5
6
–insert the slats (2), previously prepared with locking plugs, between the uprights and the crosspieces, as in the figure. Leave
the upper corner uncovered on the pockets side for the following installation of the control panel with the relevant bulbs
–after completing the installation of the slats and the fastening of the central templates (7), fasten the closing profile (8) with
the self-tapping screws supplied as standard
2
2
8
7
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Installation18
POSITIONING THE CONTROL PANEL
NOTE
The image of the control panel is only indicative as it may vary depending on the chosen model.
Proceed as follows to position the control panel:
–Fit the relevant support (9) of the control panel present in the kit on the front crosspiece of the boiler
–Position the control panel (10) on the support (9) and route the boiler regulation thermostat, safety, pump enabling and boiler
thermometer wires through the opening provided until reaching the bulb holder pockets (11) on the tube bundle.
–Fasten the control panel to the support with the supplied screws
–Complete the installation of the slats and closing profile (8) with the self-tapping screws supplied as standard.
9
11
10
8
BULB FASTENING
To achieve good thermal contact, it is necessary to use the retainer (1) to push the copper bulb (2) inside the pocket (3) screwed
in the sleeve (4).
Insert the clip (5) into the groove of sleeve (6) to avoid that the bulb slips out.
Each boiler is equipped with 2 retainers and 2 clips.
If a sleeve features 3 bulbs, the retainer is not required.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation 19
BURNER ASSEMBLY
Having chosen the burner to be used, refer to the Manual supplied with it for information about:
–the installation and fastening to the boiler
–the connection to the fuel supply
–the electrical connections
–the adjustments to be made
–maintenance
–the necessary checks.
mIMPORTANT
The insulating mat supplied as standard with the generator must be wrapped around the nosepiece for at least one full
turn in order to protect the burner flange from the flame. The insulating mat does not need to fill the gap up to the door
insulation inner surface. If the material supplied is not suitable for the burner used, use another material that can also
resist to 1000°C and whose size is appropriate to fully close the gap.
2
P6
5
Øb
4
3
1
1
2
1 Burner
2 Flange
3 Gasket
4 Door
5 Insulating mat
mIMPORTANT
For fuel oil/biogas operation, the door should have concrete insulation and be equipped with suitable tie-rods. Any
changes and/or failure to disclose information during sales will void the warranty conditions.
ELECTRICAL CONNECTIONS
The electric system of a heating plant room used only to heat the buildings must be made by an authorised company that must
comply with regulations, some of which are general while others are specific for the single types of use or combustion.
mIMPORTANT
Connect the earth cable to an effective earthing system. ICI CALDAIE S.p.A. is not liable for any damage caused by the
lack of the earthing system and the failure to comply with the instructions of the wiring diagrams.
dPROHIBITION
Do not use the water and heating system pipes for the earthing connections .
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

Installation20
WATER TREATMENT
The thermal system water must comply with the Laws in force, therefore it is good practise to use treatment units when the line
water is particularly rich in calcium carbonate, which causes scale build-ups and corrosion.
The table includes some indicative values:
Characteristics Scale Filling water Circuit water
pH* - 7,5 - 11
Hardness (CaCo2) °Fr < 15 -
Iron (Fe)** mg/kg - < 0.5
Copper (Cu)** mg/kg - < 0.1
Oxygen (O2) mg/l < 0.05*** -
Appearance Clear Possibly clear
* If there are aluminium components (radiators) in the heating system, the pH value must be between 7.5 and 8 in order to avoid
severe corrosion damage.
** Higher values indicate on-going corrosion phenomena.
*** In case of agents which form oxygen film and/or surplus, do not observe this value with intermittent operation or operation
without deaerator, but use the additive.
LIMESTONE BUILD-UPS
Limestone build-ups reduce the heat exchange between the combustion gases and water, leading to an abnormal increase of
temperature of the parts exposed to the flame and thus to a significant reduction of the service life of the boiler.
Limestone gathers in the points where the wall temperature is higher and the best defence against it, at the construction level,
is to eliminate the superheating areas.
Scale build-ups form an insulating layer which decreases the heat exchange of the boiler, penalising its efficiency. This means that
a significant part of the heat obtained from the combustion is not fully transferred to the system water, but is lost through the
chimney.
LIMESTONE DIAGRAM
Lost heat
0 5 10 15 20 30
10
20
30
%
limestone mm
CORROSION ON WATER SIDE
The corrosion of the metal surfaces of the boiler on the water side is due to the iron transit into the solution through its ions (Fe+).
In this process, the presence of dissolved gases, in particular oxygen and carbon dioxide, is very important. Corrosion phenomena
often occur with softened and/or demineralised water, which by nature is more aggressive against iron (acid water with Ph < 7);
in these cases, even when scale build-ups are prevented, corrosions can occur and it is necessary to treat the water with corrosive
process inhibitors.
Cooke Industries - Phone: [phone] Email: [email protected] Web: www.cookeindustries.co.nz