Ferroli 0T3B2HGA Technical manual

cod. 3541T010 — Rev. 00 - 10/2019
BLUEHELIX PRO RRT 24 C
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
GC No

BLUEHELIX TECH RRT 24 C
2EN
B
The CE marking certifies that the products meet the essential requirements of the rele-
vant directives in force.
The declaration of conformity may be requested from the manufacturer.
COUNTRIES OF DESTINATION: GB
This symbol indicates “CAUTION” and is placed next to all safety warnings. Strictly follow these instructions in order to avoid
danger and damage to persons, animals and things
This symbols calls attention to a note or important notice.
This symbol, which is used on the product, packaging or documents, means that at the end of its useful life, this product must
not be collected, recycled or disposed of together with domestic waste.
Improper management of electric or electronic waste can lead to the leakage of hazardous substances contained in the pro-
duct. For the purpose of preventing damage to health or the environment, users are kindly asked to separate this equipment
from other types of waste and to ask for it to be dealt with by the municipal waste service or dealer under the conditions and
according to the methods set down in national and international laws transposing the Directive 2012/19/EU.
Separate waste collection and recycling of unused equipment helps to save natural resources and to guarantee that this waste
is processed in a manner that is safe for health and the environment.
For more information about how to collect electric and electronic equipment and appliances, please contact your local Council
or Public Authority competent to issue the relevant permits.
cod. 3541T010 - Rev. 00 - 10/2019
• Read the warnings in this instruction bo-
oklet carefully since they provide important
information on safe installation, use and
maintenance.
• This instruction booklet is an integral and
essential part of the product and must be
kept with care by the user for future refe-
rence.
• If the unit is sold or transferred to another
owner or if it is to be moved, always make
sure the booklet stays with the boiler so
that it can be consulted by the new owner
and/or installer.
• Installation and maintenance must be ca-
rried out by professionally qualified per-
sonnel, according to current regulations
and the manufacturer's instructions.
• Incorrect installation or inadequate mainte-
nance can result in damage or injury. The
manufacturer declines any liability for da-
mage caused by errors in installation and
use or by failure to follow the instructions
provided.
• Before carrying out any cleaning or mainte-
nance operation, disconnect the unit from
the power supply using the system switch
and/or the special cut-off devices.
• In case of a fault and/or poor operation,
deactivate the unit and do not try to repair
it or directly intervene. Contact professio-
nally qualified personnel. Any repair/repla-
cement of the products must only be
carried out by qualified personnel using ge-
nuine parts. Failure to comply with the abo-
ve can compromise the safety of the unit.
• Periodic maintenance performed by quali-
fied personnel is essential in order to ensu-
re proper operation of the unit.
• This unit must only be used for its intended
purpose. Any other use is deemed impro-
per and therefore hazardous.
• After unpacking, check the good condition
of the contents. The packing materials are
potentially hazardous and must not be left
within the reach of children.
• The unit can be used by children aged at
least 8 years and by persons with reduced
physical, sensory or mental capabilities, or
lacking experience or the necessary
knowledge, only if under supervision or
they have received instructions on its safe
use and the related risks. Children must
not play with the unit. Cleaning and main-
tenance intended to be done by the user
can be carried out by children aged at least
8 years only if under supervision.
• In case of doubt, do not use the unit. Con-
tact the supplier.
• The unit and its accessories must be
appropriately disposed of in compliance
with current regulations.
• The images given in this manual are a sim-
plified representation of the product. In this
representation there may be slight and in-
significant differences with respect to the
product supplied.

BLUEHELIX TECH RRT 24 C
3
cod. 3541T010 - Rev. 00 - 10/2019
1 Operating instructions ............................................................................................................ 4
1.1 Introduction............................................................................................................................................. 4
1.2 Control panel ..........................................................................................................................................4
1.3 Connection to the power supply, switching on and off ...........................................................................5
1.4 Adjustments............................................................................................................................................ 6
2 Installation .............................................................................................................................. 10
2.1 General Instructions .............................................................................................................................10
2.2 Place of installation ..............................................................................................................................10
2.3 Plumbing connections ..........................................................................................................................10
2.4 Gas connection ....................................................................................................................................12
2.5 Electrical connections...........................................................................................................................12
2.6 Fume ducts........................................................................................................................................... 14
2.7 Condensate drain connection............................................................................................................... 20
3 Service and maintenance...................................................................................................... 21
3.1 Adjustments..........................................................................................................................................21
3.2 Commissioning..................................................................................................................................... 32
3.3 Maintenance.........................................................................................................................................33
3.4 Troubleshooting....................................................................................................................................42
4 Technical data and characteristics ...................................................................................... 45
4.1 Dimensions and connections ............................................................................................................... 45
4.2 General view ........................................................................................................................................47
4.3 Hydraulic circuit .................................................................................................................................... 47
4.4 Technical data table ............................................................................................................................. 48
4.5 Diagrams ..............................................................................................................................................50
4.6 Wiring diagram ..................................................................................................................................... 50

BLUEHELIX PRO RRT 24 C
4EN
cod. 3541T010 - Rev. 00 - 10/2019
1. Operating instructions
1.1 Introduction
Dear Customer,
BLUEHELIX PRO RRT 24 C is a high-efficiency, low emissions premix condensing heat generator with a stainless
steel heat exchanger and incorporated DHW production, using natural gas or LPG and equipped with a microprocessor
control system.
The sealed chamber unit is designed for indoor installation with temperatures as low as -5°C (-15°C with optional anti-
freeze kit).
1.2 Control panel
fig. 1- Control panel
Panel legend fig. 1
1DHW temperature setting decrease button
2DHW temperature setting increase button
3
Heating system temperature setting decrease button
4 Heating system temperature setting increase button
5Display
6 Reset button - Outside Temperature Compensation
7Mode selection button: “Winter”, “Summer”,
“Unit OFF”, “ECO”, “COMFORT”
8Eco (Economy) or Comfort mode
9DHW demand
10 Summer mode
12 Multifunction display (flashing during exchanger
protection function)
13 Heating demand
14a Burner lit (flashing during calibration function
and self-diagnosis phases)
14b Appears when a fault has occurred causing the
unit to shut down. To restore unit operation,
press the RESET button (detail 6)
17 External sensor detected (with optional external
probe)
Indication during operation
Heating
A heating demand (generated by the Room Thermo-
stat or Remote Timer Control) is indicated by the acti-
vation of the radiator symbol (detail 13 - fig. 1).
The display (detail 12 - fig. 1 ) shows the actual heating
flow temperature and after the heating demand a standby
or delay time message “
d2 ” appears (see fig 2).
fig. 2
Domestic hot water (DHW)
A DHW demand (generated by drawing hot water) is indicat-
ed by the activation of the tap symbol (detail 9 - fig 1).
The display (detail 12 - fig. 1) shows the actual DHW
outlet temperature and after the DHW a standby or de-
lay time message “d1“ appears (see fig 3.).
fig. 3
9
4
1712
8510
3
2
1
14b14a 6713

BLUEHELIX PRO RRT 24 C
5EN cod. 3541T010 - Rev. 00 - 10/2019
Comfort
A Comfort demand (reinstatement of temperature inside the boiler) is indicated by flashing of the Comfort symbol. The
display (detail 12 - fig. 1) shows the actual temperature of the water within the boiler.
Fault
In case of a fault (see cap. 3.4 "Troubleshooting") the display shows the fault code (detail 12 - fig. 1) and during safety
pause times the messages “d3” or “d4” will be displayed.
1.3 Connection to the power supply, switching on and off
Boiler not electrically powered
BTo avoid damage caused by freezing during
long idle periods in winter, it is advisable to
install an external frost protection kit & en-
sure the Gas, water & power supplies are
maintained correctly.
fig. 4- Boiler not electrically powered
Boiler electrically powered
Switch on the power to the boiler (Max 3 amp switched fused spur supply at 230v a.c)..
• During the first 5 seconds the display shows the P.C.B software version (fig. 5).
• For the following 20 seconds the display will show FH which Indicates the heating system air venting cycle with the
fan operating (fig. 6). The internal pump will cycle on & off during this period.
• In the next 280 seconds, the venting cycle continues with the fan off (fig. 7) & again the pump will cycle on & off.
• Open the gas isolation valve under the boiler
• When the message Fh disappears, the boiler is ready to operate automatically whenever domestic hot water is
drawn or there is a heating demand.
Electronically turning the boiler off and on
To switch modes, press the winter/summer/off button, for about 1 second, in the order indicated in fig. 8.
A = Winter Mode (Heating & hot water) Heating via external controls i.e time clock & room thermostat.
B = Summer Mode (Hot water only)
C = Off Mode (Boiler frost protection only no heating or hot water) services must be maintained.
To turn the boiler off, press the winter/summer/off button (detail 7 - fig. 1) repeatedly until the display shows dashes.
fig. 8- Turning the boiler off
fig. 5- Switching on / Software version fig. 6- Vent with fan on fig. 7- Vent with fan off
ABC

BLUEHELIX PRO RRT 24 C
6EN
cod. 3541T010 - Rev. 00 - 10/2019
When the boiler is turned off, the printed circuit board
is still powered. Domestic hot water and heating are
disabled. The frost protection system remains activat-
ed. To operate the boiler normally, press the winter/
summer/off button (detail 7 - fig. 1) twice.
fig. 9
The boiler will be immediately ready in Winter and DHW mode.
BThe frost protection system does not work when the power and/or gas to the unit are turned off. In winter to
avoid damage to the entire system caused by freezing during long periods of shutdown, it is advisable to fit an
external frost protection kit..
NOTE - If the sun symbol does not appear on the display but the multifunction numbers are present, the boiler is
in“Winter” mode.
1.4 Adjustments
Winter/summer switchover
Press the winter/summer/off button (detail 7 - fig. 1)
until the display shows the Summer symbol (detail 10
- fig. 1): the boiler will only deliver domestic hot water.
The frost protection system remains activated.
fig. 10
To reactivate the Winter mode, press the winter/sum-
mer/off button (detail 7 - fig. 1) twice.
NOTE:- Do not hold the winter/summer/off button "in"
as you will enter the OTC zone mode & the screen will
display as shown should this occur please
press & hold the winter/summer/off button until the dis-
play returns to its normal mode.
fig. 11
Heating temperature adjustment
Use the heating buttons (details 3 and 4 - fig. 1) to ad-
just the temperature from a min. of 20°C to a max. of
75°C.
fig. 12

BLUEHELIX PRO RRT 24 C
7EN cod. 3541T010 - Rev. 00 - 10/2019
DHW temperature adjustment
Use the DHW buttons (detail 1 and 2 - fig. 1) to adjust
the temperature from a min. of 40°C to a max. of 55°C.
BIf a small amount of water is drawn and/or
with an increased cold water inlet temper-
ature, then the DHW outlet temperature
may vary from the actual set-point tem-
perature.
fig. 13
Room temperature adjustment (with optional room thermostat)
Using a room thermostat, or programmable room thermostat set the temperature required in the rooms. ( The
use of a room thermostat / programmable thermostat is mandatory as per the Building regulations part L).
Room temperature & time adjustment (with optional room thermostat)
Using the remote timer control, set the required temperature in the rooms. The boiler will adjust the system water according
to the required room temperature. For operation with remote timer control, please refer to the relevant instruction manual.
ECO/COMFORT selection
The unit has a function that ensures a quick domestic hot water delivery rate to ensure maximum comfort for the user.
When the device is activated (COMFORT mode), the water contained within the boiler is kept warm, therefore ensuring
a faster response for hot water upon opening a domestic hot tap or shower.
The device can be deactivated by the user (ECO mode) by pressing the winter/summer/off button (detail 7 - fig. 1) for
5 seconds. In ECO mode the display activates the ECO symbol (detail 12 - fig. 1). To activate the COMFORT mode,
press the winter/summer/off button again (detail 7 - fig. 1) for 5 seconds.
Outside Temperature Compensation (OTC)
When the optional external sensor is installed the boiler adjustment system works with "OTC". In this mode, the heating
system temperature is regulated according to weather conditions, to ensure a high comfort and energy efficiency
throughout the year. In particular, as the outside temperature increases the system flow temperature decreases accord-
ing to a specific "compensation curve".
With the “OTC“ adjustment, the temperature set with the heating buttons (detail 3 - fig. 1 ) becomes the maximum system
flow temperature. It is advisable to set a maximum value to allow system adjustment throughout its useful operating range.
The boiler must be adjusted at the time of installation by fully trained personnel. However, the user can make any further
adjustments necessary to optimise comfort levels.
Compensation curve and curve offset
Press the reset button (detail 6 - fig. 1) for 5 seconds to access the “OTC” menu; the display shows “CU” flashing.
Use the DHW buttons (detail 1 - fig. 1) to adjust the desired curve from 1 to 10 according to the characteristic (fig. 14).
By setting the curve to 0, the “OTC” adjustment is disabled.
Press the heating buttons (detail 3 - fig. 1) to access parallel curve offset; the display shows “OF” flashing. Use the DHW
buttons (detail 1 - fig. 1) to adjust parallel curve offset according to the characteristic (fig. 15).
Press the heating buttons (detail 3 - fig. 1) to access the menu “shutdown for external temperature”; the display shows
"SH"flashing. Use the DHW buttons (detail 1 - fig. 1) to adjust the shutdown external temperature. If set to 0 the function
is disabled; the range varies from 1 to 40°C. The boiler will ignite when the external probe temperature is 2°C lower than
the set temperature.

BLUEHELIX PRO RRT 24 C
8EN
cod. 3541T010 - Rev. 00 - 10/2019
Press the reset button (detail 6 - fig. 1) again for 5 seconds to exit the "OTC" menu.
If the room temperature is lower than the required value, it is advisable to set a higher value curve and vice versa. Pro-
ceed by increasing or decreasing in steps of one and check the result in the room before any further adjustments.
Adjustments from Remote Timer Control
AIf the boiler is connected to the Remote Timer Control (optional) with OpenTherm protocol, the previously de-
scribed adjustments can be made as described table 1.
Table. 1
System draining
The drain tap ring nut is located under the safety valve
inside the boiler.
To drain the boiler turn off the supplied isolation valves
underneath, then turn the ring (ref. 1 - fig. 17) anti-
clockwise to open the tap. Do not use any tools; use
hands only.
fig. 16- Safety valve with built in drain tap
fig. 14- Compensation curves fig. 15- Example of compensation parallel
curve offset
Heating temperature adjustment Adjustment can be made from the Remote Timer Control menu and the boiler control panel.
DHW temperature adjustment Adjustment can be made from the Remote Timer Control menu and the boiler control panel.
Summer/Winter Switchover Summer mode has priority over a possible Remote Timer Control heating demand.
Eco/Comfort selection
On disabling DHW from the Remote Timer Control menu, the boiler selects Economy mode. In this
condition, the eco/comfort button on the boiler panel is disabled.
By enabling DHW from the Remote Timer Control menu, the boiler selects Comfort mode. In this con-
dition it is possible to select one of the two modes on the boiler panel.
Outside Weather Compensation You can make all the adjustments by using the remote timer control.
Outside Air temperature
Maximum boiler flow temperature
20
30
40
50
60
70
80
90
85
20
30
40
50
60
70
80
90
85
1
2
3
4
5
6
8910 7
1
2
3
4
568910 7
OFFSET = 20
OFFSET = 40
1

BLUEHELIX PRO RRT 24 C
9EN cod. 3541T010 - Rev. 00 - 10/2019
2. Installation
2.1 General Instructions
BThis unit must only be used for its intended purpose. This unit is designed to heat water to a temperature below
boiling point and must be connected to a heating system and/or a water supply system for domestic use, com-
patible with its performance, characteristics and heating capacity. Any other use is deemed improper.
THE BOILER MUST ONLY BE INSTALLED BY QUALIFIED PERSONNEL, IN COMPLIANCE WITH ALL THE IN-
STRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT LAW, THE REQUIRE-
MENTS OF THE TECHNICAL STANDARDS (BS) AND ANY LOCAL REGULATIONS AND THE RULES OF PROPER
WORKMANSHIP.
Incorrect installation can cause damage or injury for which the manufacturer cannot be deemed responsible.
The unit must be installed in compliance with these instructions and the following standards applicable in
Great Britain.
Gas Safety Regulations (Installations & Use).
Local Building Regulations.
The Building Regulations (Part L).
The Buildings Standards (Scotland - Consolidated) Regulations).British Standards Codes of Practice (BSI):
The Industry Guidance For Installers On Condensate Drainage Pipe Installation (HHIC)
Model Water By-Laws (Great Britain)
For Northern Ireland the relevant laws in force must be observed.
Safe handling of materials
Pay attention when handling the boiler insulation panels as they contain materials that could irritate the skin. No part of
the boiler contains asbestos, mercury or CFC's.
The use Personal Protective Equipment (PPE) is always recommended.
Advice for transport and handling
For lifting and transporting always take suitable safety precautions: keep your back straight, bend knees, do not turn
your body, move feet, avoid bending forward or sideways and keep the load as close as possible to your body.
If possible, use a trolley or other suitable means to carry the boiler.
Grip the boiler firmly and, before lifting it, try and find the point where the load is concentrated in order to establish the
centre of gravity and suitably reposition yourself. Ideally seek assistance in lifting the boiler.
B.S. 5440 Part 1 Flues
B.S. 5440 Part 2 Air flow and ventilation
B.S. 5449 ......... Forced circulation hot water production systems
B.S. 6798 ......... Installation of gas-fired boilers for hot water
B.S. 6891 ......... Gas systems
B.S. 7671 ......... IEE wiring system standards
B.S. 4814 ......... Specifications for expansion tanks
B.S. 5482 ......... LPG systems
B.S. 7593 ......... Water treatment in central heating systems for DHW production
B.S. 5546 ......... Installation of systems for DHW production
B.S. 7967 ......... Guide for the use of electronic portable combustion gas analysers
B.S. 5955-8 ......... Installation of plastic pipes

BLUEHELIX PRO RRT 24 C
10 EN
cod. 3541T010 - Rev. 00 - 10/2019
2.2 Place of installation
The combustion circuit is sealed with respect to the
place of installation and therefore the unit can be in-
stalled in any room. However, the place of installation
must be sufficiently ventilated to prevent the creation
of dangerous conditions in case of even slight gas
leaks. This safety regulation is provided for by EEC Di-
rective no. 90/396 for all gas units, including those with
a sealed chamber.
In any case, the place of installation must be free of dust,
flammable materials or objects or corrosive gases.
The boiler is arranged for wall mounting and comes
standard with a hanging bracket. A paper template for
marking the drilling points on the wall is provided in the
box. The wall fixing must ensure stable and effective
support for the boiler.
AIf the unit is enclosed in a cabinet or mounted
alongside, a space must be provided for re-
moving the casing and for normal mainte-
nance operations. The minimum
measurements to be respected are given in
fig. 17.
fig. 17 - Minimum distances around the boiler
AMin. 2,5 cm
BMin. 20 cm
CMin. 30 cm
DMin. 60 cm (via an openable panel)
2.3 Plumbing connections
Important
The heating capacity of the boiler must be previously established by calculating the building's heat requirement according
to the current regulations. To ensure proper operation and long boiler life, the plumbing system must be adequately sized
and complete with all the necessary accessories, including a room thermostat, a thermostatic radiator valve (TRV), etc.
The system flow and return pipes must have a diameter of at least 22 mm for the first 3 m of length from the unit.
If the system delivery and return pipes follow a path where air pockets could form in certain places, it is advisable to
install vent valves at these points. Also, install type "A" drain cocks at the lowest points in the system to allow complete
emptying.
The temperature drop between the delivery manifold and the return to the boiler should not exceed 20 °C.
A flow rate of at least 6 litres/min through the heat exchanger is required.
BDo not use the water system pipes to earth electrical appliances.
Before installation, carefully flush all the heating system pipes to remove any residuals or impurities that could affect
proper operation of the unit (as required by BS 7593 Building regs Doc L).
BThe safety valve discharge must be connected to a 15 mm diameter copper pipe descending from the boiler
to run off system water in case of overpressure in the heating circuit. Otherwise, the boiler manufacturer
cannot be held liable if the discharge valve operates and floods the room. The discharge must be run
to the outside of the building to prevent the risk of damage or injury caused by discharged hot water in case
of overpressure in the system.

BLUEHELIX PRO RRT 24 C
11EN cod. 3541T010 - Rev. 00 - 10/2019
Typical System By-pass layout
fig. 18
The automatic by-pass must be installed a least 3 metres from the boiler & set to allow a minimum of 6 ltr/min through
the valve when all TRV's are closed.
Make up water
Provision must be made for replacing water lost from the sealed system. Reference should be made to BS6798, for
methods of filling and making up sealed systems. There must be no direct connection between the boiler's central heat-
ing system and the mains water supply. The use of mains water to charge and pressurise the system directly, is con-
ditional upon the Local Water Byelaws. Again any such connection must be disconnected after use. Ensure the filling
point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
Filling Loop in fig. 19 is supplied with boiler.
The maximum domestic water pressure for the inlet supply is 9 bar (130 P.S.I.). If the cold mains supply exceeds 5 bar
(72 P.S.I.), a water governor or pressure reducing valve must be fitted by the installer into the mains supply in an incon-
spicuous but accessible position preferably between 3 and 5 metres (10-16ft) before the appliance. Such a valve must
be approved by WRAS. The fitting of a DHW expansion vessel is also recommended.
Key
1. C.H. filling valve
2. Temporary connection
3. Cold water supply valve
4. Double check valve
fig. 19 - Filling Loop (supplied with boiler)
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Cold water mains

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12 EN
cod. 3541T010 - Rev. 00 - 10/2019
Isolation valve kit
The isolation valves supplied (see fig. 20) must be installed between the boiler and heating system to allow the boiler
to be isolated from the system if necessary.
fig. 20 - Isolation valve kit
A Heating Flow 3/4” (22mm with isolation valve fitted)
B DHW outlet elbow 1/2” (15mm with outlet union fitted)
C Gas 3/4” (22mm with yellow isolation valve fitted)
D Cold water inlet 1/2” (15mm with isolation valve fitted)
F Heating Return 3/4” (22mm with isolation valve c/w fil-
ter fitted)
Important
BConnections to the boiler must be made in such a way as to ensure that its internal pipes and fittings are free
of stress. If a pressure reducing valve C/W non-return is installed to the boilers cold water supply it must be
situated at least 3 metres from the boiler or a mini expansion vessel suitable for potable water, & correctly
sized, may be used.
BBefore installation, flush all the pipes of the system thoroughly to remove any residuals or impurities that could
affect correct operation of the unit.
In case of replacement of boiler within existing installations, the system must be completely emptied and
cleaned of any sludge and pollutants. For that purpose only use suitable guaranteed products for heating sys-
tems (see next section), that do not harm metals, plastics or rubber. The manufacturer declines any liability
for damage caused to the boiler by failure to clean the system to BS7593 & correctly dose with an ap-
proved inhibitor.
Make the connections to the respective points (see fig. 20 and fig. 54) as per the symbols on the bottom of the unit.
Antifreeze system, antifreeze fluids, additives and inhibitors
When necessary, antifreeze fluids, additives and inhibitors can be used only if the manufacturer of such fluids or addi-
tives guarantees that they are suitable and will not cause damage to the heat exchanger or other components and/or
materials within the boiler and system. Any products used must be suitable & approved for use within a domestic heating
system & noted within the benchmark certificate, a suitable label must be attached to the boiler indicating the products
used & any COSH advisory information, a warning stating "Do Not Drain" must also be on the label.

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System water characteristics
BLUEHELIX PRO RRT 24 C boilers are suitable for sealed systems only.
The water within a heating system must have the characteristics required by UNI 8065, and comply with laws and reg-
ulations in force and the provisions of EN14868 (protection of metallic materials against corrosion).
The return water from the heating system should have a "magnetic type filter" fitted to prevent any magnetite from en-
tering the pump assembly or heat exchanger
The filling water (first filling and subsequent replenishment) must be clear, with hardness below 120ppm / mg/litre and
treated with suitable chemical conditioners against the initiation of corrosion, that are not aggressive on metals and plas-
tics, do not develop gases, in low-temperature systems, & do not cause proliferation of bacterial or microbial masses.
The water in the system must be periodically checked at least once a year with the annual boiler service.The water should
possibly have a clear appearance, & a hardness level below 60ppm for new systems and below 80ppm for existing systems,
pH above 7 and below 8.5, iron content (Fe) below 0.5 mg/l, copper content (Cu) below 0.1 mg/l, chloride content below 50mg/
l, electrical conductivity below 200 µs/cm, and must contain chemical conditioners in a concentration sufficient to protect the
system for at least one year. Bacterial or microbial loads must not be present in low temperature systems
Recommended chemical conditioners:
SENTINEL X100 Inhibitor and SENTINEL X300 Cleaner
FERNOX F1 Inhibitor and FERNOX F3 Cleaner
SCALEMASTER SM-1 or SM-Pro Inhibitor and SM-3 or SM-Pro Cleaner
The unit is equipped with a frost protection system that activates the boiler in heating mode when the system flow water
temperature falls below 6°C. The device is not active if the power and/or gas supply to the unit has been isolated. If
necessary, for system protection use a suitable antifreeze liquid that meets the same requirements as detailed above
and written in Standard UNI 8065.
The presence of deposits on the boilers heat exchange surfaces due to non-compliance with the above require-
ments will invoke the remainder of the warranty.
2.4 Gas connection
BBefore making the connection to the Gas supply pipework, ensure that the appliance is suitable & la-
belled for operation with the type of fuel available.
The gas must be connected to the corresponding union (see fig. 20 - C & fig. 54 - 7) in conformity with
current regulations, with a rigid metal copper pipe, installing the supplied Gas isolation valve between
the system and boiler. Make sure that all the gas connections are tightness tested. To prevent the risk
of fire or explosion.
2.5 Electrical connections
IMPORTANT
BBEFORE CARRYING OUT ANY OPERATION THAT REQUIRES REMOVING THE CASING, DISCONNECT
THE BOILER FROM THE ELECTRIC MAINS WITH THE MAIN SWITCH.
NEVER TOUCH THE ELECTRICAL COMPONENTS OR CONTACTS WITH THE MAIN SWITCH TURNED
ON! DANGER OF ELECTRIC SHOCK WITH RISK OF INJURY OR DEATH!
BThe unit must be connected to an efficient Earthing system in accordance with applicable safety regulations.
Have the efficiency and suitability of the Earthing system checked by professionally qualified personnel; the
Manufacturer declines any liability for damage caused by failure to earth the system.
The boiler is prewired and provided with a three core cable, for connection to the electrical supply. The con-
nection to the supply must be made permanent with a double pole switched fused spur with a minimum contact
opening of at least 3 mm, a maximum fuse of rating of 3A in the Live side of the switch to the boiler. Ensure
the polarities are correct (LIVE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green wire in the connec-
tions to the power supply.
BThe boiler's supply cable MUST NOT BE REPLACED BY THE USER If the cable gets damaged, turn the
boiler off and have the cable replaced only by professionally qualified personnel. In case of replace-
ment, only use cable type “HAR H05 VV-F” 3x0.75 mm2 with max. external diameter of 8 mm. Do not splice
into the existing power cable supply for another control device as this will void any remaining warranty with the
boiler & may render the appliance unsafe to work on or use.

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cod. 3541T010 - Rev. 00 - 10/2019
Room thermostat (optional)
BIMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE CONTACTS ONLY. CONNECT-
ING 230V TO THE ROOM THERMOSTAT TERMINALS WILL PERMANENTLY DAMAGE THE PCB.
When connecting a time control or timer, the power supply can be taken from the back of the PCB housing,
see fig 20. or with the supplied batteries if required (design specific).
The room thermostat connections fig 20 Item 72 is also OpenTherm compliant this can be used to connect any
of our OpenTherm controls.
Accessing the electrical terminal block and fuse
Remove the front panel ( ”Opening the front panel” on page 32) to access the terminal block (M) and fuse (F) by pro-
ceeding as follows (fig. 21 and fig. 22). The terminals indicated in fig. 22 must be with voltage-free contacts (not
230V). The arrangement of the terminals for the various connections is also given in the wiring diagram in fig. 58.
NOTE - The terminals 14 &15 are 230v Live & Neutral to power an external clock if required (Optional extra).
Ferroli OpenTherm RF Smart Control (option) part number Y87RFC2124 should be connected to terminals 5 & 6
(see 139 fig. 22 below) It does not require a 230v connection
fig. 21
fig. 22
72
139
123456
138
A
14 15
230V
supply to
exte nal
cont ols
F
M
AOn/Off switch (option) configurab e
138 Outside sensor (option) see OTC section
139 OpenTherm room timer connection (option)
72 Programmab e room thermostat (option)
14 & 15 230v supp y for externa contro s (option)

BLUEHELIX PRO RRT 24 C
15EN cod. 3541T010 - Rev. 00 - 10/2019
2.6 Flue ducts
B
THE BOILER MUST BE INSTALLED IN PLACES THAT MEET THE FUNDAMENTAL REQUIREMENTS FOR VENTILATION.
OTHERWISE THERE IS A DANGER OF SUFFOCATION OR INTOXICATION.
READ THE INSTALLATION AND MAINTENANCE INSTRUCTIONS BEFORE INSTALLING THE UNIT.
ALSO FOLLOW THE DESIGN INSTRUCTIONS
.
IN CASE OF PRESSURES ABOVE 200 Pa INSIDE THE FUME EXHAUST PIPES, CLASS "H1” FLUES MUST BE USED.
Important
The unit is “type C” with a sealed chamber and forced draught; the air inlet and flue outlet must be connected to one of
the following extraction/suction systems. Before installation, check and carefully observe the above descriptions.
The positioning of wall and/or roof terminals and the minimum distances from windows, walls & ventilation outlets must
be adhered to as per BS5440.
Connection with concentric chimney flues
fig. 23 - Examples of connection with concentric chimney flues ( = Air / = Fumes)
Table. 2- Max. length concentric chimney flues
For concentric flue installations, you must use one of the following appliance adaptors. For the wall hole dimensions, refer to the
dimensions on the template or refer to Section 4 Technical data & characteristics. Any horizontal sections of the flue must slope slight-
ly back towards the boiler to prevent any condensate causing a nuisance from dripping out the flue terminal.
NOTE : The flue terminal length must be sealed both inside & out through the external wall with a suitable sand & cement mix.
fig. 24- Appliance adaptors for concentric chimney flues
Concentric 60/100 Concentric 80/125
Max. permissible length (horizontal) 7 m 28 m
Max. permissible length (vertical) 8 m
Reduction factor 90° bend 1 m 0.5 m
Reduction factor 45° bend 0.5 m 0.25 m
C
1X
C
1X
C
3X
C
3X
C
3X
C
1X
115
77
Ø 100
Ø 60
Ø 128
Ø 60
Cod. 041088X0
041006X0041083X0
Ø 80
Ø 127
120
147
Ø 100
Ø 60
115
77
Ø 100
Ø 60
Ø 100
Ø 60
992
890
Cod. 041089X0
Ø 128
Ø 60
Ø 100
Ø 60
992
890

BLUEHELIX PRO RRT 24 C
16 EN
cod. 3541T010 - Rev. 00 - 10/2019
Connection with 80mm Twin pipes
fig. 25- Examples of connection with Twin pipe system ( = Air / = Fumes)
Table. 3 - Examples & Classification
Twin flue appliance adaptor, to facilitate the use of the separate 80mm flue & 80mm air ducts:
fig. 26- Twin flue appliance adaptor for separate ducts
Before installation, make sure the maximum permissible length has not been exceeded, by means of a simple calculation:
1. Establish the layout of the proposed the twin pipe system, including any accessories and outlet terminals.
2. Consult table 5 and identify the losses in meq (equivalent metres) for each & every component.
3. Check that the sum of total losses is less than or equal to the maximum permissible length in table 4.
Table. 4- Max. length separate ducts
Type Description
C1X Wall horizontal exhaust and intake. The inlet/outlet terminals must be together on the same wall to ensure they are in the same
pressure zone. The terminals should protrude a maximum of 15cm from the wall, with a max 50cm separation (min 15cm)
C3X Roof vertical exhaust and intake. The inlet/outlet ducts are combined within the room sealed vertical flue terminal.
C5X Wall or roof exhaust and intake separate or in areas with different pressures. The exhaust and intake must be positioned on the
same facing elevation of the building & not opposite to each other.
C6X Intake and exhaust with separately certified pipes (EN 1856/1)
B2X Intake from installation room or compartment utilising wall or roof flue terminal options.
IMPORTANT - THE ROOM MUST BE PROVIDED WITH APPROPRIATE VENTILATION FOR COMBUSTION PURPOSES
Max. permissible length 80 meq
C5x
C
3x
B2x C1x
max 50 cm
80
100
80
60
cod. 041082X0

BLUEHELIX PRO RRT 24 C
17EN cod. 3541T010 - Rev. 00 - 10/2019
Table. 5- Accessories
Connection to collective flues
fig. 27- Examples of connection to collective flues ( = Air / = Fumes)
Table. 6 - Examples & classification
If the boiler is to be connected BLUEHELIX PRO RRT 24 C to a collective flue or to a single flue with natural draught,
the flue or chimney must be expressly designed by professionally qualified technical personnel in conformity with the
current regulations and be suitable for room sealed fan assisted boilers.
Backflow preventer valve
The boiler BLUEHELIX PRO RRT 24 C is equipped as standard with a backflow preventer valve (anti-backflow system),
therefore it can be connected to a positivepressure collective flue system, only if using G20 gas.
Losses in meq
Air
intake
Fume exhaust
Vertical Horizontal
Ø 80
PIPE 1 m M/F 1KWMA83W 1.0 1.6 2.0
BEND 45° M/F 1KWMA65W 1.2 1.8
90° M/F 1KWMA01W 1.5 2.0
PIPE SECTION with test point 1KWMA70W 0.3 0.3
TERMINAL air, wall 1KWMA85A 2.0 -
fumes, wall with antiwind 1KWMA86A - 5.0
FLUE Fume outlet only Ø80 010036X0 +
1KWMA86U
-4.0
ATTENTION: CONSIDER THE HIGH PRESSURE LOSSES OF Ø50 and Ø60 ACCESSORIES; USE
THEM ONLY IF NECESSARY AND AT THE LAST FUME EXHAUST SECTION.
Type Description
C2X Intake and exhaust in common flue (intake and exhaust in same flue)
C4X Intake and exhaust in common and separate flues, but undergoing similar pressure zones
C8X Exhaust in single or common flue and wall air intake
B3X Intake from installation room by means of concentric duct (that encloses the exhaust) and exhaust in common flue with
natural draught
IMPORTANT- THE ROOM MUST BE PROVIDED WITH APPROPRIATE VENTILATION FOR COMBUSTION PURPOSES
C 8X C 2X
C 4X

BLUEHELIX PRO RRT 24 C
18 EN
cod. 3541T010 - Rev. 00 - 10/2019
Position of terminals
fig. 28
Minimum dimensions of fume exhaust terminals
ADirectly under an opening, air inlet, openable window, etc. 300 mm
BAbove an opening, air inlet, openable window, etc. 300 mm
CHorizontally to an opening, air inlet, openable window, etc. 300 mm
DUnder gutters, drain pipes 75 mm
EUnder cornices or under eaves 200 mm
FUnder balconies or garages 200 mm
GFrom a drain pipe or a vertical drain pipe 150 mm
HFrom an internal or external corner 100 mm
IAbove ground level, a roof or balcony 300 mm
JFrom a surface facing the terminal 600 mm
KFrom a terminal facing the terminal 1200 mm
LFrom a garage opening (e.g. door, window) with access to the home 1200 mm
MVertically from a terminal on the same wall 1500 mm
NHorizontally from a terminal on the same wall 300 mm
OFrom the wall on which the terminal is fitted N/A
PFrom a vertical structure on the roof 150 mm
QAbove the intersection with the roof 300 mm
NOTES
•N/A = Not applicable
• Also, the terminal must be at least 150 mm (fanned draught) from an opening made in the structure of the building to
house a fitted element such as a window frame.
• Positions of flue terminals: if the flue is installed at a low level the potential effect of the plume must be considered.
Special plume management kits are available by request.
• The plume must not be directed towards:
- A frequented approach
- A window or door
- An adjacent property
P
D, E
Q
Q
BC
A
G
F
L
J
HH
K
N
N
MM
Q

BLUEHELIX PRO RRT 24 C
19EN cod. 3541T010 - Rev. 00 - 10/2019
2.7 Condensate drain connection
IMPORTANT
The boiler has an internal trap for draining condensate. Install the push on hose “B” & sediment bowl before commis-
sioning, the boiler fill the trap with approx. 0.5 L of water and connect the hose to a solvent welded waste system. For
safety reasons the hose must form a tight seal into the waste system.
BATTENTION: THE UNIT MUST NEVER BE OPERATED WITH THE TRAP EMPTY!
OTHERWISE THERE IS A DANGER THAT PRODUCTS OF COMBUSTION COULD ENTER THE ROOM.
fig. 29- Condensate drain connection
0,5 t
B

BLUEHELIX PRO RRT 24 C
20 EN
cod. 3541T010 - Rev. 00 - 10/2019
Condensate drain
(Please follow BS 6798 or Industry Guidance for Installers on Condensate pipe Installation)
The condensate should be run inside as far as is practicably possible. For that purpose, use a pipe of at least 22 mm
diameter and a trap with flexible connection supplied with the unit to facilitate connection of the condensate drain pipe.
The pipe must be in solvent weld plastic and not in copper, since the condensate has a pH of 4 (slightly acid).
If the condensate drain pipe cannot be run on the inside, then it is advisable to run it outside & into a gully connected to
a sewer system.
The pipe sections going to the outside are exposed to the risk of freezing in particularly extreme weather conditions. To
prevent this from occurring, it is advisable to reduce the length of the condensate drain pipes and run them on the inside,
as much as possible, before going to the outside. It is mandatory to insulate the condensate pipe or apply a trace heat-
ing device to help prevent freezing of the condensate.
The pipes outside the building must be in solvent weld plastic with increased diameter of 40 mm covered with "Class 0"
pipe insulation with a maximum length of 3m & connected to a condensate collection soakaway or external drain.
If using a condensate collection soakaway, it must be as indicated in the figure below, or use a specific system (such
as Mc Alpine SOAK1GR) available from the majority of plumbing and heating suppliers.
fig. 30 - Condensate drain
Exte nal
40mm Class 0 Insulated Solvent weld pipewo k (Max mt s)
Cement sea
100mm Dia tube
Bottom sea ed
Lime stone chippings
Ground eve (either/Or)
Ho e depth 400mm
25mm
2 Rows of
3x12 mm Ho es
Inte nal
-300mm
2.5° Minimum fa