Ferroli BlueHelix HiTech RRT C Technical manual

cod. 3541V691 — Rev. 00 - 04/2022
BlueHelix HiTech RRT C
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE
____________________________________
"BLUEHELIX HITECH RRT 24C" GC N° 47-267-74
"BLUEHELIX HITECH RRT 28C" GC N° 47-267-75
"BLUEHELIX HITECH RRT 34C" GC N° 47-267-76

BlueHelix HiTech RRT 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. 3541V691 - Rev. 00 - 04/2022
• Read the warnings in this instruction booklet ca-
refully since they provide important information
on safe installation, use and maintenance.
• This instruction booklet is an integral and essen-
tial part of the product and must be kept with care
by the user for future reference.
• If the unit is sold or transferred to another owner
or if it is to be moved, always make sure the boo-
klet stays with the boiler so that it can be consul-
ted by the new owner and/or installer.
• Installation and maintenance must be carried out
by professionally qualified personnel, according
to current regulations and the manufacturer's in-
structions.
• Incorrect installation or inadequate maintenance
can result in damage or injury. The manufacturer
declines any liabilityfor damage caused by errors
ininstallationanduseorbyfailuretofollow the in-
structions provided.
• Before carrying out any cleaning or maintenance
operation, disconnect the unit from the power
supply using the systemswitch and/or the special
cut-off devices.
• In case of a fault and/or poor operation, deactiva-
te the unit and do not try to repair it or directly in-
tervene. Contact professionally qualified
personnel. Any repair/replacement of the pro-
ducts must only be carried out by qualified per-
sonnel using genuine parts. Failure to comply
with the above can compromise the safety of the
unit.
• Periodic maintenance performed by qualified
personnel is essential in order to ensure proper
operation of the unit.
• This unit must only be used for its intended pur-
pose. Any other useis deemed improper and the-
refore 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
yearsandby persons with reduced physical, sen-
sory or mental capabilities, or lacking experience
or the necessary knowledge, only if under super-
vision or they have received instructions on its
safe use and the related risks. Children must not
play with the unit. Cleaning and maintenance in-
tended to be done by the user can be carried out
by children aged at least 8 years only if under su-
pervision.
• In case of doubt, do not use the unit. Contact the
supplier.
• The unit and its accessories must be appropria-
tely disposed of in compliance with current regu-
lations.
• The images given in this manual are a simplified
representation of the product. In this representa-
tion there may be slight and insignificant differen-
ces with respect to the product supplied.

BlueHelix HiTech RRT C
3
cod. 3541V691 - Rev. 00 - 04/2022
1 Operating instructions ............................................................................................................4
1.1 Introduction.............................................................................................................................................4
1.2 Control panel..........................................................................................................................................4
1.3 Connection to the power supply, switching on and off ...........................................................................7
1.4 Adjustments..........................................................................................................................................10
2 Installation..............................................................................................................................18
2.1 General Instructions .............................................................................................................................18
2.2 Place of installation ..............................................................................................................................19
2.3 Plumbing connections ..........................................................................................................................19
2.4 Gas connection ....................................................................................................................................22
2.5 Electrical connections...........................................................................................................................23
2.6 Fume ducts...........................................................................................................................................25
2.7 Condensate drain connection...............................................................................................................30
3 Service and maintenance......................................................................................................32
3.1 Adjustments..........................................................................................................................................32
3.2 Commissioning.....................................................................................................................................38
3.3 Maintenance.........................................................................................................................................38
3.4 Troubleshooting....................................................................................................................................46
4 Technical data and characteristics......................................................................................51
4.1 Dimensions and connections ...............................................................................................................51
4.2 General view ........................................................................................................................................52
4.3 Hydraulic circuit....................................................................................................................................52
4.4 Technical data table .............................................................................................................................53
4.5 Diagrams..............................................................................................................................................57
4.6 Wiring diagram .....................................................................................................................................58

BlueHelix HiTech RRT C
4EN
cod. 3541V691 - Rev. 00 - 04/2022
1. Operating instructions
1.1 Introduction
Dear Customer,
BlueHelix HiTech RRT C is a high-efficiency, low emissions premix condensing heat generator with heat exchanger
in s/steel and incorporated DHW production, equipped with a microprocessor control system.
It can use Natural Gas (G20), Liquefied Gas (G30-G31), Propane Air (G230) and, thanks to the “Hydrogen plug-in”
system, it self adjusts to also work with mixtures of natural gas and hydrogen (Natural Gas/Hydrogen mixtures 80%/
20%), that will soon arrive in Europe to fight global warming.
The sealed chamber unit is suitable for indoor installation or outdoors in a partially protected place (according to EN
15502) with temperatures to -5°C.
1.2 Control panel
fig. 1- Control panel
Panel legend fig. 1
1DHW temperature setting decrease button
2DHW temperature setting increase button
3Heating system temperature setting decrease
button
4Heating system temperature setting increase
button
5Display
6Return button
7“Winter”, “Summer”, “Unit OFF”, “ECO”,
“COMFORT” mode selection button
8Eco mode ( )
9DHW mode
10 Summer/Winter mode
11 Menu / confirm button
12 System pressure
13 Heating mode
14 Burner lit
15 “Key lock” on
4
3
6
7
2
1
11
25°C
45°C
13
9
1.2
bar
12
10
8
5
14
14
15

BlueHelix HiTech RRT C
5EN
cod. 3541V691 - Rev. 00 - 04/2022
Indication during operation
Heating
A heating request (generated by the Room Thermos-
tat or Remote Timer Control) is indicated by the flas-
hing radiator symbol.
When the burner is lit, the flame symbol appears and
the 3 levels indicate the actual intensity.
fig. 2
DHW (domestic hot water)
A DHW request (generated by hot water draw-off) is
indicated by the flashing faucet icon.
When the burner is lit, the flame symbol appears and
the 3 levels indicate the actual intensity.
fig. 3
27°C
29°C
1.2
bar
27°C
29°C
1.2
bar

BlueHelix HiTech RRT C
6EN
cod. 3541V691 - Rev. 00 - 04/2022
Comfort
In Comfort mode (restoration of boiler internal temperature) the flame symbol appears while the faucet flashes.
Frost protection
In frost protection mode (flow temperature below 5°C) the flame symbol appears.
Fault
In case of a fault, the display shows the fault code with different graphics depending on the type.
A-type fault (fig. 5): To unlock the boiler in the presence of this type of fault, press the button until the message
“Confirm?” appears. Then confirm with the button .
F-type fault (fig. 4): A fault which will be automatically reset after the problem has been eliminated.
Message-type fault (fig. 6): The fault is such as not to compromise boiler operation. The message disappears when
the problem is eliminated.
fig. 4 fig. 5 fig. 6
F13
A01
21
°C
--
°C
F12 Alarm

BlueHelix HiTech RRT C
7EN
cod. 3541V691 - Rev. 00 - 04/2022
1.3 Connection to the power supply, switching on and off
Boiler not electrically powered
B
To avoid damage caused by freezing during long idle periods in winter, it is advi-
sable to drain all the water from the boiler.
Boiler electrically powered
Electrically power to the boiler.
• During the first 5 seconds the display shows the software version of the board and display (fig. 7).
• For the following 20 seconds the display will show FH which identifies the heating system air venting cycle with the
fan running (fig. 8).
• In the next 280 seconds, the venting cycle continues with the fan off (fig. 9).
• Open the gas valve ahead of the boiler
• When the message Fh disappears, the boiler is ready to operate automatically whenever hot water is drawn or in
case of a room thermostat request
To interrupt the venting phase (FH or Fh), keep the button pressed until the message “Stop?” appears. Then con-
firm with the button .
fig. 10
fig. 7- Switching on / Software version fig. 8- Vent with fan on fig. 9- Vent with fan off
MAIN FW 1.00
DSP FW 1.00
FH
2%
Fh
6%
0%
FH
2%
Stop?

BlueHelix HiTech RRT C
8EN
cod. 3541V691 - Rev. 00 - 04/2022
Turning the boiler off and on
Changing from one mode to another is possible by repeatedly pressing the button , following the sequence shown
in fig. 11.
A =“Summer” mode - B = “Winter” mode - C = “Off” mode
To turn the boiler off, repeatedly press the button until detail Cof fig. 11 is displayed.
fig. 11- Turning the boiler off
When the boiler is turned off, the PCB is still powered. DHW and heating are disabled. The frost protection system re-
mains on. To relight the boiler, press the button .
The boiler will be immediately ready in Winter and DHW mode.
B
The frost protection system does not work when the power and/or gas to the unit
are turned off. To avoid damage caused by freezing during long shutdowns in win-
ter, it is advisable to drain all water from the boiler, the DHW circuit and the heating
system water; or drain just the DHW circuit and add a suitable antifreeze to the
heating system, as prescribed in sec. 2.3.
ABC
27
°C
29
°C
1.2
bar
OFF
37
°C
1.2
bar
OFF
OFF
1.2
bar

BlueHelix HiTech RRT C
9EN
cod. 3541V691 - Rev. 00 - 04/2022
1.4 Adjustments
Winter/summer switchover
Repeatedly press the button until the summer symbol (sun) appears, with the word "OFF" for heating (detail 10 -
fig. 1): the boiler will only deliver hot water. The frost protection system remains on.
To reactivate the winter mode, repeatedly press the button until the snowflake appears.
fig. 12- Summer fig. 13- Winter
Heating temperature adjustment
Use the heating buttons (details 3 and 4 - fig. 1) to ad-
just the temperature from a minimum of 20°C to a
maximum of 80°C. The maximum value can be chan-
ged inside the parameters menu [TSP] via parameter
P40.
fig. 14
DHW temperature adjustment
Use the DHW buttons (details 1 and 2 - fig. 1) to adjust
the temperature from a minimum of 40°C to a maxi-
mum of 55°C. The maximum value can be changed in-
side the parameters menu [TSP] via parameter P46.
fig. 15
B
If little water is drawn and/or with a high water inlet temperature, the DHW
outlet temperature may differ from the set temperature.
OFF
12
°C
bar
1.2
48
°C
35
°C
1.2
bar
CH SET
80
°C
DHW SET
54
°C

BlueHelix HiTech RRT C
10 EN
cod. 3541V691 - Rev. 00 - 04/2022
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature required in the rooms. If the room thermostat is not installed, the boiler
will keep the system at the set system delivery setpoint temperature.
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the required temperature in the rooms. The boiler will adjust the system water ac-
cording to the required room temperature. For operation with remote timer control, please refer to the relevant instruc-
tion manual.
ECO/COMFORT selection
The unit has a function that ensures fast hot water delivery and maximum comfort for the user. When this function is
active (COMFORT mode), the water in the boiler is kept at temperature, thus giving the immediate availability of hot
water from the boiler when the faucet is turned on, avoiding waiting times.
The COMFORT function can be disabled by the user (ECO mode) by pressing the button for 2 seconds. In ECO
mode the display activates the symbol (detail 12 - fig. 1). To activate COMFORT mode press the button again
for 2 seconds; the symbol disappears.
Main menu [MENU]
Pressing the button displays the main menu of the boiler [MENU] shown in fig. 16.
The desired items can be selected with the buttons and heating.
To access the menus contained in the navigation menu [MENU], press the button after selecting the desired item.
•[Service] - Menu reserved for the installer
See “Installer menu [SERVICE]” on page 12.
•[Diagnostic] - Provides information on boiler sta-
tus, in real time.
See “Boiler information menu [Diagnostic]” on
page 13.
•[Counters] - Boiler counters.
See “Boiler counters menu [Counters]” on
page 14.
•[Alarm] - Storage of last faults that occurred in the
boiler.
See “Boiler faults menu [Alarm]” on page 14.
•[Display] - For doing the display settings.
See “Display adjustment menu [Display]” on
page 15.
fig. 16- Main menu
MENU
Servi e
Diagnosti
Counters
Alarm
Display

BlueHelix HiTech RRT C
11EN
cod. 3541V691 - Rev. 00 - 04/2022
Installer menu [SERVICE]
After selecting the installer menu [Service], press the button . To continue, enter the password “1234”. Use the
buttons and DHW to set the cell value, and the buttons and heating to shift position (fig. 17).
fig. 17- Password entry
Confirm with the button to access the installer menu[SERVICE] screen where the following menus are available:
•[TSP] - Menu for modifying transparent parame-
ters
•[Test] - Activation of boiler Test mode.
•[OTC] - Setting of climatic curves for adjustment
with external probe.
•[Zone] - Settings of climatic curves of additional
zones.
•[Auto Setup] - This menu is used to activate cali-
bration. Visible only with parameter b27 set to 5.
fig. 18
PASSWORD PASSWORD
1 200 0000
SERVICE
TSP
Test
OTC
Zone
Auto Setup

BlueHelix HiTech RRT C
12 EN
cod. 3541V691 - Rev. 00 - 04/2022
Boiler information menu [Diagnostic]
This menu provides the information, in real time, of the various sensors present in the boiler.
To access it, press the button from the main screen, select the item [Diagnostic] and confirm with the button .
fig. 19
Table 1 - Description - Boiler information menu [Diagnostic]
If the sensor is damaged or disconnected, the display will show dashes (--).
To return to the main screen, repeatedly press the button or wait for automatic switching after 15 minutes.
Parameter displayed Description Range
[CH 1 temp] NTC Flow sensor (°C) 0 ÷ 125 °C
[CH 2 temp] NTC Return sensor (°C) 0 ÷ 125 °C
[DHW temp] NTC DHW sensor (storage tank probe) (°C) 0 ÷ 125 °C
[Ext temp] NTC External sensor (°C) +70 ÷ -30°C
[Fume temp] NTC Fume sensor (°C) 0 ÷ 125 °C
[Fan rpm] Actual fan rpm 0 ÷ 9999 RPM
[Pump speed] Actual modulating circulating pump speed (%) 00% = Min., 100% = Max.
[Power] Actual burner power (%) 0 ÷ 100 %
[DHW flow] Actual DHW draw (l/min) 00 ÷ 99 l/min
[Water Pressure] Actual system water pressure (bar) 0.0 ÷ 9.9 bar
[Flame] Flame status -- ÷ 255
DIAGNOSTIC DIAGNOSTIC
CH 1 temp
CH 2 temp
DHW temp
Ext temp
Fume temp
Fan rpm
Pump speed
Power
27
°C
26°C
25°C
--°C
28°C
0rpm
0%
--%
Ext temp
Fume temp
Fan rpm
Pump speed
Power
DHW flow
Water Pressure
Flame
--°C
28°C
0rpm
0%
--%
0,0
l/min
0,8 bar
--

BlueHelix HiTech RRT C
13EN
cod. 3541V691 - Rev. 00 - 04/2022
Boiler counters menu [Counters]
The system counters are displayed in this menu:
[Burner]
Burner operation total hours.
[Ignition ok]
Number of successful ignitions
[Ignition error]
Number of failed ignitions.
[CH pump time]
Pump operation hours in heating.
[DHW pump time]
pump operation hours in DHW.
fig. 20
Boiler faults menu [Alarm]
The card can store the last 10 faults. Alarm 1 represents the most recent fault that occurred.
The codes of the faults saved are also displayed in the relevant menu of the Remote Timer Control.
Press the buttons and Heating to scroll the list of faults. Cancel is the last item in the list and which, once se-
lected and confirmed with the button , allows all the faults history to be reset.
To exit the Boiler faults menu [ALARM], press the button repeatedly until reaching the main screen or wait for
automatic exit after 15 minutes.
fig. 21
COUNTERS
Burner
Ignition ok
Ignition error
CH pump time
DHW pump time
0h
3
0
--h
--h
ALARM ALARM
Alarm 1
Alarm 2
Alarm 3
Alarm 4
Alarm 5
Alarm 6
Alarm 7
Alarm 8
37
37
13
--
--
--
--
--
Alarm 4
Alarm 5
Alarm 6
Alarm 7
Alarm 8
Alarm 9
Alarm 10
Can el
--
--
--
--
--
--
--

BlueHelix HiTech RRT C
14 EN
cod. 3541V691 - Rev. 00 - 04/2022
Display adjustment menu [Display]
In this menu it is possible to set some display parame-
ters.
[Contrast] - Contrast adjustment
[Brightness] - Brightness adjustment
[Backlight time] - Display lighting duration
[Lock time]* - Key lock
After keypad inactivity for a time equal to the
set value (minutes), the symbol appears
and the buttons are inhibited.
To reactivate the keypad, press the bu-
ttons and simultaneously until the
symbol disappears (about 2 sec.).
* This function is available from version DSP
FW 1.03.
[Reset] - Restore factory values
fig. 22
Sliding Temperature
When the external probe (optional) is installed, the boiler adjustment system works with "Sliding Temperature". In this
mode, the heating system temperature is regulated according to weather conditions, to ensure high comfort and energy
efficiency throughout the year. In particular, as the outside temperature increases the system flow temperature decrea-
ses according to a specific "compensation curve".
With "Sliding Temperature", the temperature set using the heating buttons (details 3 and 4 - fig. 1) becomes the maxi-
mum 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 qualified personnel. However, the user can make any further
adjustments necessary to optimize comfort levels.
Compensation curve and curve offset
From the main screen, press the button to access the navigation menu [MENU]. Using the buttons and
heating select the installer menu [SERVICE] and confirm with the button . Enter the password (see ”Installer
menu [SERVICE]” on page 12 ) and press the button . Using the buttons and heating select the menu Cli-
matic curves setting [OTC] and confirm by pressing the button .
Curve: select this item and use the buttons and
DHW to adjust the desired curve from 1
to 10.
By adjusting the curve to 0, the sliding tem-
perature adjustment is disabled (see fig. 24).
Offset: Access this sub-menu to access parallel off-
set of the curves using the buttons and
DHW. Refer to fig. 25 for the characteris-
tics.
OFF: This item gives access to the "external tem-
perature shutdown” value. Use the buttons
and DHW to modify the value (from
0 to 40°C), if set to 0 the function is disabled.
Ignition occurs when the temperature of the
external probe is more than 2°C lower than
the set temperature.
fig. 23
DISPLAY
Contrast
Brightness
Ba klight time
Lo k time
Reset
5
Max
10m
OFF
OTC
Curve
Offset
OFF

BlueHelix HiTech RRT C
15EN
cod. 3541V691 - Rev. 00 - 04/2022
To exit the Climatic curves setting [OTC] menu, press the button repeatedly until reaching the main screen.
If the room temperature is lower than the desired value, it is advisable to set a higher order curve and vice versa. Pro-
ceed by increasing or decreasing in steps of one and check the result in the room.
Adjustments from Remote Timer Control
A
If the boiler is connected to the Remote Timer Control (optional), the previously described adjustments are
managed as described in table 2.
Table 2
System water pressure adjustment
The filling pressure, with system cold, read on the boiler water gauge (detail 2 - fig. 26) must be approx 1.0 bar. If the
system pressure falls below minimum values, the boiler stops and fault F37 is displayed.
Once the system pressure is restored, the boiler will activate the 300-second air venting cycle, indicated on the display
by Fh.
To avoid boiler shutdown, it is advisable to periodically check (with system cold) the pressure on the pressure gauge or
on the display (detail 12 - fig. 1). In case of a pressure below 0.8 bar, it is advisable to restore it.
fig. 24- Compensation curves
fig. 25- 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 the Comfort mode
(if previously enabled from the boiler panel). In this condition it is possible select one of the
two modes on the boiler panel.
Sliding Temperature You can make all the adjustments by using the remote timer control.
Display Description Operation
High pressure The boiler stops
Pressure slightly high The boiler works at reduced power
20
30
40
50
60
70
80
90
85
20 10 0 -10 -20
1
2
3
4
5
68910 7
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
F40
2.3
bar

BlueHelix HiTech RRT C
16 EN
cod. 3541V691 - Rev. 00 - 04/2022
System draining
The drain cock ring nut is located under the safety val-
ve inside the boiler.
To drain the system, turn the ring nut (ref. 3 - fig. 26)
counter-clockwise to open the cock. Do not use any
tools; use hands only.
To drain only the water in the boiler, first close the
shut-off valves between the system and boiler before
turning the ring nut.
To connect the safety valve to a disposal system, ins-
tall the kit supplied (details 1 and 2 - fig. 26).
fig. 26
Optimum pressure Normal operation
Pressure slightly low
(The indication with the symbol
is visible only if parameter b09 is set
to 1).
The boiler continues to work.
It is advisable to refill the system as soon as possible.
Low pressure The boiler stops
Display Description Operation
1.2
bar
0.7
bar
F37
3
2
1

BlueHelix HiTech RRT C
17EN
cod. 3541V691 - Rev. 00 - 04/2022
2. Installation
2.1 General Instructions
B
This unit must only be used for its intended purpose. This unit is designed to heat
water to a temperature below boiling pointand mustbe connected to a heating sys-
tem and/or a water supply system for domestic use, compatible with its performan-
ce, characteristics and its heating capacity. Any other use is deemed improper.
BOILER INSTALLATION MUST ONLY BE CARRIED OUT BY QUALIFIED PERSONNEL, IN ACCORDANCE WITH
ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT LAW, THE
PRESCRIPTIONS OF THE TECHNICAL STANDARDS (BS), ANY LOCAL REGULATIONS AND THE RULES OF
PROPER WORKMANSHIP.
Incorrect installation can cause damage or injury for which the manufacturer declines any responsibility.
Installation of this unit must be carried out in strict compliance with the present instructions and the following
regulations 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):
Model Water By-Laws
For Northern Ireland, observe the current applicable regulations.
Safe handling of materials
Pay attention when handling the boiler insulation panels because the material they are made of could irritate the skin.
No part of the boiler contains asbestos, mercury or CFC's.
Advice for transport and handling
For lifting and transport 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.
B.S. 5440 Detail 1 Flues
B.S. 5440 Detail 2 Air supply and ventilation
B.S. 5449 ......... Systems for hot water production with forced circulation
B.S. 6798 ......... Installation of gas-fired boilers for hot water
B.S. 6891 ......... Gas systems
B.S. 7671 ......... IEE wiring system regulations
B.S. 4814 ......... Specifications for expansion tanks
B.S. 5482 ......... LPG systems
B.S. 7593 ......... Water treatment in central heating systems for domestic hot water production
B.S. 5546 ......... Installation of systems for domestic hot water production
B.S. 5955-8 ......... Installation of plastic pipes

BlueHelix HiTech RRT C
18 EN
cod. 3541V691 - Rev. 00 - 04/2022
2.2 Place of installation
B
The combustion circuit is sealed with respect to the place of installation and
therefore the unit can be installed in any room except in a garage. The place
of installation must be sufficiently ventilated to prevent the creation of dan-
gerous conditions in case of even small gas leaks. Otherwise there may be
risk of suffocation and intoxication or explosion and fire. This safety stan-
dard is set by the EEC Directive no. 2009/142 for all units that use gas (inclu-
ding sealed chamber units).
The unit is designed to operate in a partially protected
place, with minimum temperature of -5°C. If provided
with the special frost protection kit it can be used with
minimum temperature to -15°C. The boiler must be
installed in a sheltered place, e.g. under the slope of a
roof, inside a balcony or in a protected recess.
The place of installation must be free of dusts, flam-
mable materials or objects, or corrosive gases.
The boiler is arranged for wall mounting and comes as
standard with a hooking bracket. Wall fixing must en-
sure stable and effective support for the generator.
A
If 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. fig. 27 gives the minimum
distances to be respected.
fig. 27
2.3 Plumbing connections
Important
The heating capacity of the boiler must be previously established by calculating the building's heat requirement accor-
ding 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.
B
Do not use the water system pipes to earth electrical appliances.
AMin. 2.5 cm
BMin. 20 cm
CMin. 30cm
DMin. 60 cm (via an openable panel)

BlueHelix HiTech RRT C
19EN
cod. 3541V691 - Rev. 00 - 04/2022
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).
Carry out the connections to the unit as indicated in .
B
The 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 dis-
charge valve operates and floods the room. The discharge must be run to the out-
side of the building to prevent the risk of damage or injury caused by discharged
hot water in case of overpressure in the system.
Connections to the boiler are to be made in such a way as to ensure that its internal pipes and fittings are free of stress.
If a non-return valve is installed also on the DHW circuit (if provided for), it is necessary to install a safety valve between
the boiler and circuit (with non-return valve at least 3 metres from the boiler) or an expansion tank for domestic use.
Typical System By-pass layout
fig. 28
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.
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Cold water mains

BlueHelix HiTech RRT C
20 EN
cod. 3541V691 - Rev. 00 - 04/2022
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 hea-
ting 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. 29 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 in-
conspicuous 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.
Isolation valve kit
The isolation valves supplied (see fig. 30) must be installed between the boiler and heating system to allow the boiler
to be isolated from the system if necessary.
fig. 30 - 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)
Frost protection system, antifreeze liquids, additives and inhibitors
If necessary, the use of antifreeze liquids, additives and inhibitors is allowed, only and exclusively if their manufacturer
guarantees that the products are suitable for use and do not cause damage to the boiler’s heat exchanger.or other com-
ponents and/or materials of the boiler and system. It is prohibited to use generic antifreeze liquids, additives or inhibitors
that are not expressly suitable for use in heating systems and compatible with the materials of the boiler and system
Key
1. C.H. filling valve
2. Temporary connection
3. Cold water supply valve
4. Double check valve
fig. 29 - Filling Loop (supplied with boiler)