Alpha InTec 50CS User guide

Installation, User and
Servicing Instructions
InTec 50CS
Floor standing, high output,
condensing boiler
Leave these instructions with the User

2Alpha Intec 50CS
To comply with Building Regulations Part L1 (Part 6 in Scotland) the boiler should be installed in accordance with the
manufacturer’s instructions. Self-certication that the boiler has been installed to comply with Building Regulations can be
demonstrated by completing and signing the Benchmark Checklist at the back of these instructions
Code of Practice
For the installation, commissioning and servicing of domestic heating and hot water products.
Benchmark places responsibilities on both manufacturers and installers*. e purpose is to ensure that customers** are provided
with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer's
instructions by competent persons and that it meets the requirements of the appropriate Building Regulations. Installers are
required to carry out work in accordance with the following:
Standards of Work
• Be competent and qualied to undertake the work required.
• Install, commission, service and use products in accordance with the manufacturer's instructions provided.
• Ensure that where there is responsibility for design work, the installation is correctly sized and t for purpose.
• Meet the requirements of the appropriate Building Regulations. Where this involves notiable work be a member of a
Competent Persons Scheme or conrm that the customer has notied Local Authority Control (LABC), prior to work
commencing.
• Complete all relevant sections of the Benchmark Check list/Service Record when carrying out commissioning or servicing of
a product or system.
• Ensure that the product or system is le in a safe condition and, where possible, in good working order.
• Highlight to the customer any remedial or improvement work identied during the course of commissioning or servicing
work.
• Refer to the manufacturer's helpline where assistance is needed.
• Report product faults and concerns to the manufacturer in a timely manner.
Customer Service
• Show the customer any identity card that is relevant to the work being carried out prior to commencement or on request.
• Give a full and clear explanation/demonstration of the product or system and its operation to the customer.
• Hand over the manufacturer's instructions, including the Benchmark Checklist, to the customer on completion of an
installation.
• Obtain the customer's signature on the Benchmark Checklist to conrm satisfactory demonstration and receipt of
manufacturer's instructions.
• Advise the customer that regular product servicing is needed, in line with manufacturers' recommendations, to ensure that
safety and eciency is maintained.
• Respond promptly to calls from a customer following completion of their work, providing advice and assistance by phone
and, if necessary, visiting the customer.
• Rectify any installation problems at no cost to the customer during the installer's guarantee period.
* e use of the word "installer" is not limited to installation itself and covers those carrying out installation, commissioning and/or servicing of heating and hot water products, or
the use of supporting products (such as water treatment or test equipment).
** Customer includes householders, landlords and tenants.
e Benchmark Scheme is managed and promoted by:
Heating and Hotwater Industry Council (HHIC)
Camden House, Warwick Rd
Kenilworth
CV8 1TH
Telephone: [phone]
E-mail: [email protected]
Website: www.hhic.org.uk
BENCHMARK SCHEME
Useful contact details; Gas Safe Register - 0800 408 5577 - www.gassaferegister.co.uk
Alpha Heating Innovation;
General Sales Enquiries - 0844 871 8760
Technical Helpline - 0844 871 8764

INSTALLATIONUSERMAINTENANCE
3 Alpha Intec 50CS
CONTENTS
1.1 INTRODUCTION.
e Alpha InTec 50CS is a oor standing, high eciency, condensing, room-sealed combination boiler. e burner is lit electronically and the heat
output is controlled by a modulating fan and gas valve.
is is a combination boiler (for domestic use only) providing both central heating and domestic hot water at mains pressure.
e boiler is supplied with a pump, pressure relief valve, expansion vessel and pressure gauge fully assembled and tested. It is designed for use with a
fully pumped, sealed and pressurised central heating system.
e boiler must be installed indoors in a frost free environment.
IMPORTANT
is boiler meets the requirements for Building Regulations for unvented hot water storage systems and the Local Authority must be notied of the
intention to install. erefore the installation must be carried out by a person competent to install unvented hot water systems.
It is the law that all gas appliances are installed by a competent person, i.e. Gas Safe registered personnel, in accordance with the following
recommendations:-
Current Gas Safety (Installation and Use) Regulations
All current Building Regulations issued by the Department of the Environment, i.e. Approved Document L1.
Building Standards (Scotland) (Consolidation) Regulations issued by the Scottish Development Department
UK Water Regulations/Byelaws (Scotland)
Health & Safety Document No. 635 (e Electricity At Work Regulations 1989)
e installation should also be in accordance with the following British Standard Codes of Practice:-
BS 5440:1 Flues
BS 5546: Installation of hot water supplies for domestic purposes
BS 6700: Design, installation, testing and maintenance of services supplying water
BS 6798: Installation of gas red hot water boilers
BS 6891: Gas installation
BS 7593: Code of Practice for treatment of water in heating systems
BS 7671: Requirements for electrical installations, IEE Wiring Regulations
BS EN 12828 Heating systems in Buildings. Design for water based heating systems
BS EN 12831 Heating systems in Buildings. Method of calculation for design heat load
BS EN 14336 Heating systems in Buildings. Installation and commissioning of water based heating systems
Reference should be made to DEFRA document 'Guide to condensing boiler installation assessment procedures for dwellings'.
If installation is in a timber framed building, refer to the Institute of Gas Engineers document IGE/UP/7.
is appliance meets the requirements of IPX4D, i.e. degree of protection against moisture.
is appliance contains no asbestos and no substances have been used in the construction process that contravene the COSHH Regulations (Control
of Substances Hazardous to Health).
Failure to install this appliance correctly could lead to prosecution. It is in your own interest and that of safety to ensure that the law is complied with.
Manufacturer's instructions must NOT be taken in anyway as over-riding statutory obligations.
Notes: 1. Ensure that the Benchmark Checklist has been completed aer the boiler has been installed and commissioned.
2. It is the law that all boiler installations are registered by the installer through the Gas Safe Gas Work Notication Scheme.
3. e boiler must only be used with Alpha CD condensing ue components.
NOTE: e boiler can be supplied ready for use with Propane (LPG).
e LPG boiler is also designed for use with a fully pumped, sealed and pressurised heating system.
In addition to the regulations and requirements stated in these installation and servicing instructions, LPG boilers must be installed in accordance
with BS 5482:1 - e Installation of Propane Burning Appliances in Permanent Dwellings.
Installation pipes, cylinders and pressure regulators for LPG boilers should be tted in accordance with BS5482:1. Bulk tank installations must comply
with the requirements of the Home Oce code of practice for the storage of liqueed petroleum gas at xed installations.
LPG boilers must not be installed in a room or internal space below ground level, e.g. in a basement or cellar, except where at least one side is open to
ground level.
LPG supply pipes must be capable of delivering the required quantity of gas in addition to the demand from any other appliances in the house. e
complete installation must be tested for gas soundness against leaks.
LPG boilers have been tested and factory set for use with Propane (LPG), it should only be necessary to ensure the correct gas supply pressure of 37 mbar is
available.
1 BOILER INSTALLATION
USER pageINSTALLATOR page MAINTENANCE page
1 Boiler installation.................................................3
1.1 Introduction. ........................................................3
1.2 Dimensions...........................................................4
1.3 Connections.........................................................................4
1.4 Remote controls and programmable room
thermostats (optional).........................................5
1.5 External temperature sensor (optional)............5
1.6 Fit the ue.............................................................6
1.7 Reduce the ue.....................................................7
1.8 Extend the ue .....................................................8
1.9 Plume management components (optional)....9
1.10 Vertical ue options...........................................11
1.11 Disposal of condensate......................................11
1.12 Flush the system. ...............................................12
1.13 Fill the system.....................................................12
1.14 Circulation pump...............................................13
1.15 Boiler components.............................................15
2 User and maintenance instructions.................16
2.1 Servicing. ............................................................16
2.2 General warnings...............................................16
2.3 Control panel......................................................16
2.4 Operating modes. ..............................................17
2.5 Using the boiler. .................................................17
2.6 Fault signals. .......................................................18
2.7 Boiler shutdown.................................................19
2.8 Restore the system pressure..............................19
2.9 Drain the system................................................19
2.10 Drain the hot water system...............................19
2.11 Anti-freeze protection.......................................19
2.12 Case cleaning......................................................19
2.13 Decommissioning..............................................19
2.14 Parameters and information menu. ................20
3 Boiler start-up (initial check)...........................21
3.1 Hydraulic diagram.............................................21
3.2 Wiring diagram..................................................22
3.3 Troubleshooting.................................................22
3.4 “Chimney sweep function”................................22
3.5 Pump anti-seize function..................................23
3.6 ree-way anti-seize function..........................23
3.7 Radiator anti-freeze function...........................23
3.8 P.C.B. periodic self-check. ................................23
3.9 Automatic vent function...................................23
3.10 Yearly appliance check and maintenance. ......23
3.11 Casing removal...................................................24
3.12 Combustion settings..........................................25
3.13 Technical data.....................................................26
3.14 Short parts list ....................................................27
Benchmark checklist .........................................28
Service record.....................................................29

Fig. 1-2
Fig. 1-1
Power supply cable
DHW
Mains cold water
Safety valve
CH return
CH flow
Gas
INSTALLATIONUSERMAINTENANCE
4Alpha Intec 50CS
1.3 CONNECTIONS
Gas connection:
e boiler is designed to operate with Natural
gas (Cat I2H 2H - G20 - supplied at 20 mbar)
or Propane gas (Cat I3P 3P - G31 - supplied
at 37 mbar). Supply pipes must be the same
as or larger than the 3/4" boiler tting. Before
connecting the gas line, carefully clean inside all
the supply pipes to remove any residue that could
impair boiler performance. Also make sure the
gas corresponds to that for which the boiler is
prepared (see boiler data-plate).
e gas supply pipe must be suitably dimensioned
according to current regulations in order to
guarantee correct gas ow to the burner even
in conditions of maximum boiler output and
to guarantee appliance efficiency (technical
specications).
Storage tanks (LPG):
- New LPG storage tanks may contain residual
inert gases (nitrogen) that degrade the mixture
delivered to the appliance causing functioning
anomalies.
- Due to the composition of the LPG mixture,
layering of the mixture components may occur
during the period of storage in the tanks. is
can cause a variation in the heating power of
the mixture delivered to the appliance, with
subsequent change in its performance.
Hydraulic connection:
Important: in order not to void the warranty
before making the boiler connections, carefully
ush the heating system (pipes, radiators, etc.)
with de-scaling products to remove any deposits
that could compromise correct boiler operation.
For further detail see Section 1.12.
Height (mm) Width (mm) Depth (mm)
850 650 600
Connections
Gas Domestic hot water Central heating
A B C E F
3/4" 1/2" 1/2" 3/4" 3/4"
A - Gas
B - Domestic hot water outlet
C - Cold water inlet
D - Condensate outlet
E - Central heating return
F - Central heating ow
G - DHW temp/press relief valve
H - CH pressure relief valve
I - Secondary circuit (optional)
1.2 DIMENSIONS
D
H
A
F
E
C
B
I
G
320 60 60 45 45 40
40 40
80
6
814
133
973
850
650 70
65
57
211
307
600
23
20
44
Flue elbow centreline

45
58
31
Fig. 1-3 Fig. 1-4
T
OFFSET
TE
TE MaxTE Min
T Max
T Min
INSTALLATIONUSERMAINTENANCE
5 Alpha Intec 50CS
EXTERNAL SENSOR:
Flow temperature depending on the external temperature and user
adjustments of the central heating temperature.
Condensate drain:
To drain the condensate produced by the
appliance, it is necessary to connect to the
drainage system by means of acidic condensate
resistant pipes having a diameter of at least 22
mm. e system connecting the appliance to the
drainage system must be carried out in such a way
as to prevent freezing of the liquid contained in
it. Before appliance commissioning, ensure that
the condensate can be correctly removed. Also,
comply with national and local regulations on
discharging waste waters.
For further detail see Section 1.11.
Electrical connection:
e boiler has an IPX5D protection rating for the
entire appliance. Electrical safety of the appliance
is reached only when it is correctly connected
to an ecient earthing system as specied by
current safety standards.
e power supply cable must be connected to a
230V ±10% / 50Hz mains supply respecting L-N
polarity and earth connection , this network
must also have a multi-pole circuit breaker.
1.4 REMOTE CONTROLS AND
PROGRAMMABLE ROOM
THERMOSTATS OPTIONAL
e boiler is suitable for use with programmable
room timer thermostats or remote controls,
which are available as optional kits.
Alpha programmable room thermostats are
connected with 2 wires only. Carefully read the
user and assembly instructions supplied with
the kit.
Installation on low temperature system:
e boiler can directly supply a low temperature
system by acting on parameter 'P66' (Service
Engineers Document - Programming the PCB)
and setting the ow temperature adjustment
range 'P66/A' and 'P66/B'. In this situation it is
good practice to insert a safety device in series
with the power supply and boiler. is device is
made up from a thermostat with a temperature
limit of 60°C. e thermostat must be positioned
on the system ow pipe at a distance of at least 2
metres from the boiler.
T = Central heating temperature
TE = External temperature.
TMAX - TMIN = Selected ow temp. range.
e following controls for the InTec50CS are also available from Alpha:
Part No. 3.021395, CAR V2 ....................InTec50CS wired modulating thermostat
Part No. 3.021622, Crono 7..................... InTec50CS wired digital thermostat
Part No. 3.021624, Crono 7RF................InTec 50CS wireless digital termostat
1.5 EXTERNAL TEMPERATURE SENSOR
OPTIONAL
e boiler is suitable for use with the external
sensor (Fig. 1-3), which is available as an optional
kit. The sensor can be connected directly to
the boiler electrical system and allows the
maximum ow temperature to be automatically
decreased when the external temperature
increases, in order to adjust the heat supplied to
the system according to the change in external
temperature. e external sensor always operates
when connected, regardless of the presence or
type of room thermostat used and can work
in combination with Alpha programmable
thermostats. e correlation between system
ow temperature and external temperature is
determined by the parameters set in menu 'M5'
under 'P66' according to the curves represented
in the diagram (Fig. 1-4). e external sensor
must be connected to terminals 38 and 39 on
the boiler PCB, (Fig. 3-2).

INSTALLATIONUSERMAINTENANCE
6Alpha Intec 50CS
- Adjust the telescopic section of the ue to
the distance 'L', ensuring that the two labels
marked 'TOP' are aligned, then seal and secure
the joint between the ducts with the sealing
tape supplied.
Note: Always ensure that there is a minimum
overlap of 25 mm when fully extending the
telescopic section.
- Pass the ue assembly through the wall (from
inside or outside).
Fig. 1-6 Side ue
Fig. 1-7
Fig. 1-8 - Fitting the ue from inside
Note: Internal tting - If there is no access to
make good the outside wall, locate the outside
(black) ue sealing collar onto the outer duct
of the ue immediately before the terminal
grille onto the location provided. Push the
ue assembly through the 130 mm ue hole,
so that the collar completely passes through
the wall. en pull the ue assembly back into
the correct position. Visually check that the
collar is sealing the outside wall and that it is
not restricting any of the openings of the ue
terminal. See Fig. 1-8.
Fig. 1-5 Rear ue
Using a single
CD Easy-Flue
500 mm
1000 mm
B + C (mm)
Min
130
590
Check collar is
sealing the wall
and it is not
restricting any
openings of the
flue terminal
130 mm
Seal joint with tape
L
Using a singleCD
Easy-Flue
500 mm
1000 mm
B + C (mm)
Min
-
378
Max
143
742
Using a single
CD Easy-Flue
500 mm
1000 mm
B + C (mm)
Min
302
762
Max
527
972
Max
355
800
Right hand exit ueLe hand exit ue
(B + C)
Rear Flue
Boiler
(B + C)
Side Flue
Boiler
(B + C)
Side Flue
Boiler
1.6 FIT THE FLUE  FIGS. 5 AND 16
e following procedure applies to tting an
Alpha CD Easy-Flue to both rear or side exit
ue - horizontally only.
- e CD Easy-Flues are suitable for use in the
ue length ranges shown in the tables in Figs
1-5 and 1-6.
Note: Where the length is less than the
minimum or more than the maximum, refer
to Section 1.7.
- Determine the overall length (L) of ue required, (see Fig. 1-7) as follows:-
Rear exit L = wall thickness (B) + distance between boiler and wall (C) + 230 mm
le exit L = wall thickness (B) + distance between boiler and wall (C) + 442 mm
Right exit L = wall thickness (B) + distance between boiler and wall (C) + 58 mm

INSTALLATIONUSERMAINTENANCE
7 Alpha Intec 50CS
- Position the smaller Easy-Flue 40 mm clamp
(with seal) supplied, over the bend. Fit the bend
to the boiler and rotate to the correct position.
Secure in position using the clamp. Ensure the
clamp is located centrally over both the bend
and boiler adaptor.
- Fit the inside (white) ue sealing collar over the
Easy-Flue. If it was not previously tted, t the
outside (black) ue sealing collar onto the ue
immediately before the terminal grille onto the
location provided.
- Slide the larger Easy-Flue 45 mm clamp over
the outer duct and pull the flue assembly
towards the bend, locating the inner duct into
the seal joint on the bend. Ensure the labels
marked 'TOP' are positioned at the top before
securing the ue assembly to the bend with the
clamp (three screws) located centrally over the
joint.
Fig. 1-9 - Rear ue
Note: Check the ue terminal protrudes 120
mm out of the wall and the inner duct of the
terminal is positioned correctly (see Fig. 1-9).
- Make good the inside wall by pushing the
inside ue sealing collar upto the wall.
1.7 REDUCING THE FLUE  FIG. 110
When the ue length required is less than the
minimum stated in Section 1.6, paragraph 1,
refer to Fig. 1-10.
Discard the rst telescopic section (not the
section with the terminal) of the Easy-Flue
1000 mm or 500 mm and cut to the required
length.
Note: Ensure that all cuts are square and free
from burrs.
Once assembled with the components pushed
home, the ue is fully sealed.
Fig. 1-10
Allow 20 mm 30 mm
Do not cut past this point
120
Inner duct
End of outer duct
Elbow seal joint
90° bend
Easy-Flue 40 mm clamp
and seal
Easy-Flue 45 mm clamp
Terminal
Flue sealing collar
Note: Ensure the outer flue duct is horizontal
Side of boiler
CD Easy-Flue
Ensure the inner duct within
the terminal is at the top.
The inner duct must
be positioned to slope towards
the boiler
Note:
20
65
Inner duct seal
307
210
This dimension will be greater
if the boiler is not against the wall
This dimension will be greater
if the boiler is not against the wall

INSTALLATIONUSERMAINTENANCE
8Alpha Intec 50CS
1.8 EXTENDING THE FLUE  FIG. 111
Note: e ue assembly length must not
exceed the maximum length stated, including
the equivalent lengths of any extensions, bends
etc. used for plume management components.
InTec boilers must not exceed the maximum of
an equivalent horizontal ue length of 12 m.
- When the ue length required is more than the
maximum stated in Section 1.6, paragraph 1,
refer to the table below and Fig. 1-6.
Rear Flue length (B + C)
Up to maximum:-
11.885 m
Side Flue length (B + C)
Up to maximum:-
11.805 m
Comments
Alpha CD 750 mm ue extension (Part No. 6.2000750) or 1000 mm extension (Part No.
6.2001050) is required to extend the range of telescopic ue.
Refer to Section 1.8 for instructions on how to extend the ue.
Note: A 130 mm ue hole (127 mm core drill) may be required in the wall. is is when
the extended ue is passed through the wall.
Additional support brackets are required when extending the ue. ese are available from Alpha, Part No. 6.1000355.
- Use the template (supplied with the boiler) to
mark the required ue position, ensure the
slope towards the boiler is correct.
- Determine the overall ue length as described
in Section 1.6, paragraph 2 to determine the
number of Alpha CD 750 or 1000 mm ue
extensions required.
- Assemble the flue extensions together by
locating the inner duct into the seal joint
and secure each extension together with the
extension clamps supplied (three screws).
Ensure that the clamps are positioned centrally
over the joints.
Note: If it is required to cut an extension,
DO NOT cut the end of the inner duct that
incorporates the seal joint. Ensure the inner
duct end without the seal joint is cut so that it
is 20 mm longer than the outer duct.
Ensure that all cuts are square and free from
burrs.
Once assembled with the components pushed
home, the ue is fully sealed.
Fig. 1-11 - Le side ue
- Adjust the telescopic section of the Easy-Flue
to the required length and secure the Easy-Flue
with the sealing tape supplied. Fit the Easy-Flue
to the extensions by locating the inner duct into
the seal joint and secure with the clamp (three
screws), ensuring it is located centrally over the
joint.
- Mark the end of the ue assembly 'TOP' where
it is connected to the boiler, so that the 'TOP'
of the ue terminal is aligned with the 'TOP'
at the boiler end of the ue assembly.
- Pass the complete ue assembly through the
wall.
- Position the smaller Easy-Flue 40 mm clamp
(with seal) supplied, over the bend. Fit the bend
to the boiler and rotate to the correct position
and secure in position. Ensure the seal is
located centrally over both the bend and boiler
adaptor. If the inside sealing collar (white) is
being used to make good the inside wall, then
it will need to be tted before assembling the
ue.
- Slide the larger Easy-Flue 45 mm clamp (two
screws) over the outer duct and pull the ue
assembly towards the bend, locating the inner
duct into the seal joint on the bend.
- Secure the ue assembly to the bend with the
clamp ensuring it is positioned centrally over
the joint, ensuring the 'TOP' marked on the
outer duct is positioned at the top.
Note: Check the ue terminal protrudes 120
mm out of the wall and that the inner duct
of the terminal is positioned correctly, i.e. the
inner duct within the terminal is at the top. See
Fig. 1-11 or 1.12.
- Make good the outside wall by fitting the
outside sealing collar (black) onto the location
provided immediately behind the ue terminal
grille. Make good the inside wall using the
inside sealing collar (white) if required.
Easy-Flue 45 mm clamp
Easy-Flue
40 mm clamp
and seal
Front of boiler
Extension clamp
Inner seal joint
Inner seal joint
Flue length (L)
90° bend
Seal joint
CD Easy-Flue
Ensure outer flue duct of Easy-Flue is horizontal
Ensure the flue extension slopes
downwards towards the boiler by a
minimum of 25 - 30 mm per metre
CD Flue extension
Flue sealing
collar
120
Terminal
20
517
422
End of extension
Ensure the inner duct within the terminal
is at the top.
The inner duct must be positioned
to slope towards the boiler
Note:

INSTALLATIONUSERMAINTENANCE
9 Alpha Intec 50CS
Fig. 1-12 - Right side ue
Easy-Flue 45 mm clamp
Easy-Flue
40 mm clamp
and seal
Front of boiler
Extension clamp
Inner seal joint
Inner seal joint
Flue length (L)
90° bend
Seal joint
CD Easy-Flue
Ensure outer flue duct of Easy-Flue is horizontal
Ensure the flue extension slopes
downwards towards the boiler by a
minimum of 25 - 30 mm per metre
CD Flue extension
F
lue sealing
collar
Ensure the inner duct within the terminal
is at the top.
The inner duct must be positioned
to slope towards the boiler
Note:
120
Terminal
20
133
38
End of extension
1.9. FIT PLUME MANAGEMENT
COMPONENTS  OPTIONAL
e following procedures detail the options
for management of the exhaust ue gas/plume
emitted from the terminal.
- e terminal supplied with the Easy-Flue can
be altered to divert exhaust ue gas/plume at
an angle.
is can be achieved by simply turning the end
section of the terminal to the desired angle.
- e CD Easy-Flue can be converted to allow the
inner ue duct to be extended so as to position
the terminal in an area where the exhaust ue
gas/plume will not cause a nuisance. is can
be done before or aer installation of the ue,
providing there is access to the terminal from
outside.
a. Remove the screws (1 in Fig. 1-13) securing
the terminal and remove the terminal by
pulling it from the ue assembly. Remove the
screw (2 in Fig. 1-13) securing the terminal
end section and remove the end section from
the terminal.
Fig. 1-13
b. Locate a 93° Plume Management bend
into the ue assembly and rotate it to the
direction required.
c. Connect to the 93° bend the required Plume
Management components as detailed and
refer to Fig. 1-14.
Notes:
- e wall support brackets must be used to
secure the Plume Management pipework
to the wall and prevent disconnection of
the 93° bend from the ue assembly or any
other component.
- Each joint must be secured with one of
the screws provided to prevent accidental
disconnection.
- Ensure there is always a slight slope
towards the ue assembly tted in the
wall and there is no part of the plume
managementpipeworkwherecondensate/
rainwillcollect andcausea blockageorany
restriction.
d. Terminate the Plume Management pipework
by tting the terminal end section (push-t)
previously removed. Refer to Fig. 1-13.
e. The Plume Management components
available for extending the inner ue duct
are as follows:-
Plume Management 93° bend 60 mm dia.
(each 93° bend equivalent to 1.3 m flue
length)
Plume Management 45° bend 60 mm dia.
(each 45° bend equivalent to 0.9 m flue
length)
Plume Management 1000 mm extension 60
mm dia. (equivalent to 1 m ue length)
60 mm dia. wall bracket
1
1
2

PM length = C + (1 x 93° bend = 1.3 m) + (2 x 45° bends = 1.8 m)
C
Min.
400 mm
CD Easy-Flue
Flue sealing collar
Terminal end section
from CD Easy-Flue
PM length = C + (2 x 93° bend = 2.6 m) + (2 x 45° bends = 1.8 m)
PM length = C + (4 x 93° bend = 5.2 m)
C
Terminal end section
from CD Easy-Flue
Ensure there is a slope of approximately
3° back towards the Easy-Flue
C
Terminal end
section from
CD Easy-Flue
Fig. 1-14
Note: e equivalent horizontal ue assembly length + the equivalent plume management length (PM length) must not exceed the
maximum ue length stated for the boiler, i.e. e boiler maximum equivalent ue length must not exceed 12 metres.
Notes:
1. Ensure each joint is secured
with the screw supplied.
2. Ensure there is always a
slight slope towards the CD
Easy-Flue so that there is no
part of the pipework where
condensate will collect.
INSTALLATIONUSERMAINTENANCE
10Alpha Intec 50CS

Not less than
300 mm
H
Not less than
300 mm
Not less than
300 mm
H
Not less than
300 mm
1.10.VERTICAL FLUE OPTIONS
Hmax = 15 m Hmax = 13.2 m
Fig. 1-16
INSTALLATIONUSERMAINTENANCE
11 Alpha Intec 50CS
Fig. 1-15
1.11 DISPOSAL OF CONDENSATE.
Provision must be made for the safe disposal
of condensate produced by the ue gases of the
Alpha InTec boilers and reference should be made
to BS 6798 for the requirements on the disposal
of condensate.
e boilers incorporate a condensate trap which
has a seal of 75 mm, therefore no additional trap
is required.
The condensate should ideally be discharged
internally into an internal waste pipe (washing
machine/sink waste) or soil pipe to avoid the
possible risk of freezing. e pipework must be
in 22 mm pipe.
External pipe runs should be avoided, but if it is
necessary, the pipework should be protected from
the risk of freezing with waterproof insulation
and the length should be kept to a maximum
of 3 m and the condensate pipework should be
increased to a minimum of 32 mm diameter.
Termination should be into an external gulley or
soakaway as shown in Figs. 1.16 and 1.17.
Note: All pipework must have a continuous fall
(see Figs. 1.16 and 1.17) from the boiler and must
be of an acid resistant material such as plastic
waste pipe. (copper or steel is not suitable).
It should be noted that the connection of a
condensate pipe to a drain may be subject to local
building control requirements.
Optional Condensate Trace Heating Kit
An optional Alpha InTec trace heating kit is also
available to prevent the condensate from freezing.
The control of this kit works with a unique
patented design using the boiler PCB to control
the trace heating. e outside weather probe
measures the external temperature, activating
the trace heating cable only when the boiler is
in operation and producing condensate. is
feature together with the latest technology
variable resistance heating cable ensures only a
small amount of electrical energy is used.
If the external temperature drops below 2°C
and the boiler is on, the relay PCB is operated
and voltage is supplied to the trace heating wire
causing it to heat up and prevent the condensate
from freezing. When the outside temperature
rises to 4°C or the boiler pump stops, the trace
heater is switched o. e connection of the
outside weather probe supplied with this kit
also enables the weather compensation feature
on the boiler.
Open end of pipe
diverted into gully
below grid but above
water level
Use waterproof
pipework insulation
in very exposed
positions
Ensure pipe is
adequately supported
Plastic pipe
Minimum gradient 2½°

Fig. 1-17
INSTALLATIONUSERMAINTENANCE
12Alpha Intec 50CS
1.12 FLUSH THE SYSTEM.
It is essential that the central heating system is
thoroughly cleaned and ushed when tting
an Alpha InTec boiler. Failure to do so will
invalidate the warranty.
If a cleaning agent and inhibitor are used,
they must be applied in accordance with their
manufacturers instructions. Only products
from Fernox and Sentinel are acceptable for
use with the Alpha InTec boilers. Further
information can be obtained from Fernox
(Tel: [phone]) or Sentinel (Tel: [phone]
9563).
e system should be ushed in accordance
with BS 7593 and BS EN 14336. e following
procedures are recommended:
- Installing onto a new system:-
Fill the system, vent at automatic air vents
and radiators.
Check for leaks.
Drain the system.
If required, chemically clean the system as
instructed by the recommended cleaner
manufacturer.
Note: Ensure that the system is ushed to
remove any remains of the cleaner.
If chemical cleaner is not used to clean the
system:-
a Rell the system.
b Switch on the boiler and allow the
system to heat up to the normal
operating temperature.
c Switch o the boiler and drain the
system while the water is still hot.
d Rell the system and check for leaks.
As required, add the recommended inhibitor
to the system as instructed by the
inhibitor manufacturer.
Ground level (either/or)
22mm termination from boiler, increase to 32 mm if external
2½ fall
O
25mm
300mm
Two rows of 3 x 12mm
holes at 25mm centres,
50mm from the bottom
of the tube. Holes to face
away from house.
Cement mortar sealing
100mm plastic tube
Bottom of tube sealed
Soakaway depth 400mm
filled with limestone chippings
500 mm min.
- Installing onto an existing system, clean the
system before tting the new boiler:-
If the old boiler is still working:-
a Switch on the boiler and allow the
system to heat up to the normal
operating temperature.
b Switch o the boiler and drain the
system while the water is still hot.
c Rell and chemically clean the system
as instructed by the recommended
cleaner manufacturer.
d Ensure the system is ushed to remove
any remains of the cleaner.
e Fit the new boiler.
If the old boiler is not working:-
a Drain the system.
b Remove the old boiler.
c Flush the system through.
d Fit the new boiler.
e Rell and chemically clean the system
as instructed by the recommended
cleaner manufacturer.
f Ensure the system is ushed to remove
any remains of the cleaner and check
for leaks.
As required, add the recommended inhibitor
to the system as instructed by the
inhibitor manufacturer.
1.13 FILL THE SYSTEM.
e boiler is tted with two automatic air vents
(see Fig. 1.18), ensure that the vents are always
open.
Open the central heating ow and return valves.
Open the ll point valves on the lling loop until
water is heard to ow.
To remove the air - Vent each radiator in turn,
starting with the lowest in the system.
It is important that the pumps are properly
vented to avoid them running dry and damaging
the bearings. Unscrew and remove the cap
from the centre of the pump. Using a suitable
screwdriver rotate the exposed spindle about
half a turn, then replace the cap.
Check the operation of the pressure relief valve
(see Fig. 1.18) by turning the head anti-clockwise
until it clicks. e click is the valve liing o its
seat allowing water to escape from the system -
check that this is actually happening.
Continue to ll the system until the pressure
gauge indicates 1.0 bar. Close the ll point valve
and check the system for water soundness,
rectifying where necessary. Disconnect the lling
loop from the mains supply.
Water may be released from the system by
manually opening the drain point (see Fig. 1.18)
until the system design pressure is obtained. e
system design pressure (cold) should be between
0.75 and 1.25 bar.
Open the cold water mains inlet valve (see Fig.
1.18). Turn on all hot water taps and allow water
to ow until no air is present. Turn o taps.
Ensure that the condensate trap has been lled
with water. Refer to Section 1.11.

INSTALLATIONUSERMAINTENANCE
13 Alpha Intec 50CS
1.14 CIRCULATION PUMP FIG. 118.
e Alpha Intec boilers are supplied with 2 types
of pump, both with variable speed adjuster.
ese settings are suitable for most systems.
•Boiler pump. e motor has a 3- speed control.
e boiler does not operate correctly with the
control set at the slowest speed. For optimal
functionality, use the pump at maximum speed
(max. head).
Pump release. If the pump becomes stuck aer
a long period of inactivity, it must be released.
Loosen the front cap, making sure that the
water that escapes cannot cause injury/damage
to persons/objects and turn the motor sha
very carefully using a screwdriver so as not
to damage the sha. Once the pump has been
released, close the vent cap.
•Zone 1 pump. The pump is ideal for the
requirements of each heating system in a
domestic and residential environment. In fact,
the pump is equipped with electronic control
that allows the advanced functions to be set.
Programme P (P-V) - Proportional curve
(Green LED). This allows the head to be
proportionally reduced as the system heat
demand decreases (ow rate reduction). Due
to this function, the electrical consumption
of the pump will be reduced: the power used
by the pump decreases together with the
pressure level and ow rate. With this setting,
the pump guarantees optimal performance
in most heating systems, thereby being
particularly suitable in single-pipe and two-
pipe installations. Any noise of the water ow
in the pipes, valves and radiators is eliminated
by reducing the head.
Programmes C3 and C4 (P-C) - Constant
curve (White or Orange LED). e pump
maintains a constant head as the system heat
demand decreases (ow rate reduction). With
these settings, the pump is suitable for all oor
systems where all the circuits must be balanced
for the same drop in head.
MIN-MAX Program (Blue LED). e pump
is distinguished by adjustable operating curves
by positioning the selector in any point between
the Min and Max positions, thereby satisfying
any installation requirement (from a simple
single-pipe to more modern and sophisticated
systems) and always guarantee optimum
performance. e precise working point can be
selected in the entire eld of use by gradually
adjusting the speed.
Adjustments. Turn the selector and set it on
the desired curve to adjust the pump.
Diagnostics in real time: a bright LED
(in various colours) provides information
regarding the pump operating status.
Programme LED colour
P (ΔP-V) green
C3 (ΔP-C) - H=3 m white
C4 (ΔP-C) - H=4 m orange
Min - Max blue
ATTENTION! e pump is
blocked but still live. red
Possible pump release. A stuck pump is
indicated by a xed red LED. Turn the selector
up to the MAX position, disconnect and
reconnect the power to restart the automatic
release process. e pump will then activate
the procedure that will last a maximum of
15 minutes and the LED will ash upon each
restart. It then turns blue for a few seconds
and goes back to red if the attempt to restart is
not successful. Once the process is complete,
set the selector back to the desired curve and
if the problem has not been resolved, perform
the manual release procedure as follows.
- Disconnect the power to the boiler (the LED
goes o).
- Close the system ow and return and let the
pump cool down.
- Empty the system circuit via the relative valve.
- Remove the motor and clean the impeller.
- Once the release is complete, remount the
motor.
- Fill the primary circuit; restore the power of
the boiler and set the desired curve.
Important: Take care if the system has been in
operation as the water may be HOT.

Fig. 1-18
1
2
3
4
5
6
Head (m)
0
10
20
30
40
50
60
Power (W)
0
Flow (l/h)
0200 400 600 800 1000 1200 1400 1600 1800 2000
A
C
B
D
1
2
3
4
5
6
Head (m)
0
10
20
30
40
50
60
Power (W)
0
Flow (l/h)
0200 400 600 800 1000 1200 1400 1600 1800 2000
E
G
F
J
H
I
A = Head available to the system with pump at maximum speed
B = Head available to the system with pump at minimum speed
C = Pump power at maximum speed
D = Pump power at minimum speed
E = Head available to the system with pump selector in position C4 (standard setting)
F = Head available to the system with pump selector in position P
G = Head available to the system with pump selector in position C3
H = Pump power with selector in position P
I = Pump power with selector in position C4 (standard setting)
J = Pump power with selector in position C3
INSTALLATIONUSERMAINTENANCE
14Alpha Intec 50CS

35
36
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33 34
1.15 BOILER COMPONENTS
Fig. 1-19
1 - Gas valve
2 - Flue thermostat
3 - DHW expansion vessel (3 litre)
4 - Flame sensing electrode
5 - System pump
6 - Automatic air vent
7 - Hydraulic manifold
8 - Fan
9 - Check valve
10 - Domestic hot water temperature sensor
11 - System pressure switch
12 - Manifold drain tap
13 - Automatic air vent
14 - Boiler pump
15 - Hot water store drain tap
16 - System drain tap
17 - Flue gas sampling point
18 - Pressure test points
19 - Manual air vent
20 - Ignition generator
21 - Air supply pipe
22 - Condensing heat exchanger
23 - Burner
24 - Ignition electrode
25 - Venturi
26 - Flow sensor
27 - Burner injector
28 - Overheat thermostats
29 - System safety valve (3 bar)
30 - Condensate trap
31 - Diverter valve
32 - System expansion vessel (11.7 litre)
33 - Hot water cyliner assembly (53 litre)
34 - Control panel
35 - Inlet lter, ow regulator, check valve tting
36 - domestic hot water safety valve (8 bar)
INSTALLATIONUSERMAINTENANCE
15 Alpha Intec 50CS

Fig. 2-1
23
24
3
20
1
21
10 11 12 13
6
14
7
8
9
15
19
16
17
22
18
2
4
5
INSTALLATIONUSERMAINTENANCE
16Alpha Intec 50CS
2USER INSTRUCTIONS.
2.1 SERVICING.
Important: the boiler requires periodical
maintenance and regular checks of energy
eciency in compliance with national, regional
or local provisions in force.
is ensures that the optimal safety, performance
and operation characteristics of the boiler remain
unchanged over time.
We recommend a yearly cleaning and
maintenance contract with your Service engineer.
2.2 GENERAL WARNINGS.
Use of the boiler by unskilled persons or children
is strictly prohibited.
For safety purposes, check that the ue terminal
is not blocked.
If temporary shutdown of the boiler is required,
proceed as follows:
a) drain the water system if anti-freeze is not
used.
b) shut-o all electrical, water and gas supplies.
In the case of work or maintenance to structures
located in the vicinity of ducting or devices
for flue extraction and relative accessories,
switch o the appliance and on completion of
operations ensure that a qualied technician
checks eciency of the ducting or other devices.
Never clean the appliance or connected parts
with highly ammable substances.
Never leave containers and ammable substances
in the same environment as the appliance.
•Attention: the use of components that employ
electrical power requires some fundamental
rules to be observed:
- do not touch the appliance with wet or
moist parts of the body; do not touch when
barefoot;
- never pull electrical cables or leave the
appliance exposed to atmospheric agents
(rain, sunlight, etc..);
- the appliance power cable must not be
replaced by the user;
- in the event of damage to the cable, switch o
the appliance and only contact qualied sta
for replacement;
- if the appliance is not to be used for a certain
period, disconnect the main power switch.
N.B.: the temperatures indicated by the display
has a tolerance of +/- 3°C due to environmental
conditions that cannot be blamed on the boiler.
Key
- Stand-by / On Button
A- Summer ()and winter ( ) functioning mode selection button
B- DHW priority button ( )
C- (RESET) /menu exit (ESC) reset button
D- Menu entry button (MENU)/ data conrmation (OK)
1 - Domestic hot water temperature selector switch
2 - Domestic hot water temperature set
3 - Central heating temperature selector switch
4 - Central heating temperature set
2.3 CONTROL PANEL.
5 - Presence of anomalies
6 - Display of boiler operating mode
8 - Flame presence symbol and
relative output scale
9 and 7 - Primary heat exchanger output
water temperature
10 - Boiler in stand-by
11 - Boiler connected to remote
control (Optional)
12 - Functioning in summer mode
13 - Anti-freeze function in progress
14 - Functioning in winter mode
15 - Domestic hot water priority
functioning active
16 - Presence of external connected
devices
17 - Display of menu items
18 - Functioning with external
temperature probe active
19 - Display of data conrmation or
menu access
20 and 7- External temperature display
with external probe connected
(optional)
21 - Display of reset or exit menu
request
22 - Chimney sweep function
in progress
23 - Boiler pressure gauge
24 - Multi-function display

Fig. 2-2
Fig. 2-3
Fig. 2-4
Fig. 2-5
1
2
6
SET DHW
ESC
°C




1
2
69
8
12
7
DHW ON
MENU
°C
°C




6
4
3
SET
ESC
°C




INSTALLATIONUSERMAINTENANCE
17 Alpha Intec 50CS
2.4 OPERATING MODES.
Below is a list of boiler operating modes
that appear on the status display (item 6 in
Fig. 2-1) together with a brief description.
2.5 USING THE BOILER.
Refer to Fig. 2-1.
Before lighting make sure the central heating
system is lled with water and that the pressure
gauge (item 23) indicates a pressure of 1 - 1.2 bar;
Open the gas cock upstream from the boiler.
With the boiler o, only the stand-by symbol
(item 10) appears on the display. By pressing the
() button the boiler switches on.
Once the boiler is on, by pressing button 'A'
repeatedly, the operating mode changes and
passes alternatively from summer ( ) and
winter ( ) operating modes.
•Summer ( ): in this mode the boiler
operates only to provide domestic hot water.
The temperature is set using the selector
switch (item 1) and the relative temperature
(item 2) is indicated on the display and the
'SET' indication appears (Fig. 2-2). By turning
the selector switch (item 1) in a clockwise
direction the temperature increases and in an
anti-clockwise direction it decreases.
During the heating of the domestic hot water
'DHW ON' appears on the status display
(item 6) and at the same time as the burner
lights the ame presence display switches on
(item 8) together with the output scale next
to it. e displays (items 7 and 9) indicate the
instantaneous outlet temperature from the
primary heat exchanger. As shown in Fig. 2-3.
Set domestic hot water temperature
Summer operating mode with domestic hot
water only
Set the central heating ow temperature
Winter operating mode with domestic hot
water and central heating
Display (item 6) Description of operating mode
SUMMER Summer operating mode without request in progress.
Boiler in stand-by for domestic hot water request.
WINTER Winter operating mode without request in progress.
Boiler in stand-by for domestic hot water or central heating request.
DHW ON Domestic hot water mode in progress.
Boiler operating, domestic hot water heating in progress.
CH ON Central heating mode in progress.
Boiler operating, central heating in progress.
F3 Anti-freeze mode in progress.
Boiler operating to restore the minimum safety temperature against boiler freezing.
DHW OFF
With domestic hot water priority disabled (item 15 sysmbol o), the boiler only operates
in central heating mode for 1 hour, however keeping the domestic hot water store at
minimum temperature (20°C), aer which the boiler goes back to the normal operation,
previously set.
F4
Post ventilation in progress.
Fan in function aer a request for domestic hot water or central heating in order to
evacuate residual fumes.
F5
Post circulation in progress.
Pump operating aer a request for domestic hot water or central heating in order to cool
the primary circuit.
P33
e optional environment thermostat (TA) not working, the boiler functions all the time
in central heating mode. (Can be activated through the 'Customisation' menu. It allows
activation of the central heating even if the TA is out of order).
STOP
Reset attempts nished.
Wait for 1 hour to re-acquire 1 attempt.
(See Ignition failure on following page).
ERR xx Fault present with relative error code.
e boiler does not work. (see Section 2.6, fault signals).
SET During rotation of the domestic hot water temperature selector switch (item 1 Fig. 2-1)
the adjustment status of the domestic hot water temperature is displayed.
SET During rotation of the central heating selector switch (item 3 Fig. 2-1) the adjustment
status of the boiler ow temperature for central heating is displayed.
SET
In presence of the external probe (optional) replace the 'SET' item.
e value that appears is the correction of the ow temperature with respect to the
functioning curve set by the external probe. See OFFSET on external probe graphics (Fig.
1-4).
F8
System deaeration in progress.
During this phase, which lasts 18 hours, the boiler pump is started at pre-established
intervals, thus allowing deaeration of the central heating system.
•Winter( ): in this mode the boiler operates
to provide both domestic hot water and central
heating. e temperature of the domestic hot
water is always adjusted using the selector
switch (item 1), the central heating temperature
is adjusted using the selector switch (item 3)
and the relative temperature is indicated on the
display (item 4) and the 'SET' appears on the
status display (item 6). As shown in Fig. 2-4.
By turning the selector switch (item 3) in a
clockwise direction the temperature increases
and in an anti-clockwise direction it decreases.
During the request for central heating 'CH ON'
appears on the status display (item 6) and at the
same time as burner lights the ame presence
display switches on (item 8) together with the
output scale next to it. e displays (items
7 and 9) indicate the instantaneous outlet
temperature from the primary heat exchanger.
As shown in Fig. 2-5.
In the central heating mode, if the temperature
of the water contained in the system is sucient
to heat the radiators, the burner will shut o
and only the pump will operate.
1
2
814
4
3
69 7
CH ON
MENU
°C
°C°C





Fig. 2-6
Fig. 2-7
INSTALLATIONUSERMAINTENANCE
18Alpha Intec 50CS
Note: e boiler may start-up automatically if the
anti-freeze mode is activated, (item 13 Fig. 2-1).
Also, the boiler can operate for a brief period
of time aer a demand for domestic hot water
in order to return the domestic hot water store
back to temperature.
Important: With the boiler in stand-by mode
() hot water cannot be produced and the
safety systems cannot be guaranteed, such as
pump anti-block, anti-freeze and three way
anti-block.
2.6 FAULT SIGNALS.
e Alpha InTec boiler signals any faults by the
ashing symbol (item 5 in Fig. 2-1) along with
'ERRxx' on the staus display (item 6). Where 'xx'
corresponds to the error code described in the
following table.
Fault signalled Error
code
Ignition failure 01
Safety thermostat fault
(overheating), ame control fault 02
Flue safety thermostat fault 03
Short circuit or bad connection 04
Flow sensor fault 05
Maximum number of resets reached 08
Insucient system pressure 10
Storage tank sensor fault 12
Conguration error 15
Fan fault 16
Flame sensing fault 20
Return sensor fault 23
Push button control panel fault 24
Insucient circulation 27
Loss of remote control
communication 31
Low temperature zone 2 sensor fault 32
Low temperature zone 3 sensor fault 33
Low temperature zone 2 safety
thermostat operation 34
Low temperature zone 3 safety
thermostat operation 35
IMG Bus communication loss 36
Low power supply voltage 37
Loss of ame signal 38
Ignition failure. e boiler lights automatically
with each demand for central heating or
domestic hot water. If it does not light within 10
seconds, the boiler remains in stand-by for 30
seconds, tries again and if the second attempt
fails it will go into 'ignition block' (ERR01). To
eliminate 'ignition block' the Reset button 'C'
must be pressed. e fault can be reset 5 times
•Domestic hot water priority function By
pressing button 'B' the DHW priority function
is deactivated, which is marked by the switch-
o of the symbol (item 15 in Fig. 2-1) on the
display. e disabled function keeps the water
contained in the storage tank at a temperature
of 20°C for 1 hour, giving the priority to central
heating.
•Functioning with external sensor (Fig. 2-6)
optional. In the case of a system with optional
external sensor, the boiler ow temperature
for central heating is managed by the external
sensor depending on the external temperature
measured (Par. 1.5). It is possible to modify
the ow temperature from -15°C to +15°C
with respect to the adjustment curve (Fig.
1-4 Oset value). is correction, which can
be activated using the selector switch (item
3) is kept active for any external temperature
measured. The modification of the offset
temperature is indicated on the display (item 7).
e temperature indicated on the display (item
4) is the current ow temperature and aer a
few seconds from the modication it is updated
with the new correction. 'SET' appears on the
status display (Fig. 2-6). By turning the selector
switch (item 3) in a clockwise direction the
temperature increases and in an anti-clockwise
direction it decreases.
consecutively, aer which the function disabled
for at least one hour. One attempt is allowed
every hour for a maximum of 5 attempts. By
switching the boiler on and o the 5 attempts
are re-acquired. On commissioning or after
extended inactivity it may be necessary to
eliminate the 'ignition fault'. If this phenomenon
occurs frequently, contact a qualied engineer
for assistance.
Safety thermostat fault (overheating). During
operation, if a fault causes excessive overheating
of the boiler, or a fault occurs in the ame control
section, an overheating fault is triggered in the
boiler (ERR02). To eliminate 'overheating fault'
the Reset button 'C' must be pressed. If this
phenomenon occurs frequently, call a qualied
engineer for assistance.
Flue safety thermostat fault. is occurs in
the case of partial internal obstruction (due to
the presence of lime scale) or external blockage
(combustion residues) to the combustion
chamber. To eliminate the 'ue thermostat fault'
the Reset button 'C' must be pressed. Call a
qualied engineer to remove the obstructions.
Short circuit or bad connection. is occurs
in the case of faults to the safety thermostat
(overheating) or fault in the flame sensing
control. e boiler does not start and a qualied
engineer must be called.
Flow sensor fault. If the board detects a fault
with the system NTC ow sensor, the boiler will
not start. Call a qualied egineer for assistance.
Maximum number of resets reached. The
maximum number of 5 resets has been reached.
Refer to previos paragraph - Ignition failure.
Insucient system pressure. Low water pressure
inside the central heating system is detected and
prevents the boiler operating. Check the boiler
pressure gauge (item 1, Fig. 2-1) is between 1
and 1.2 bar. Restore to the correct pressure if
necessary and check for leaks.
Storage tank sensor fault. If the board detects
a fault with the storage tank sensor, the boiler
will not produce domestic hot water. A qualied
engineer must be called.
Conguration error. If the board detects a fault
in the electric wiring, the boiler will not start. If
normal conditions are restored the boiler restarts
without having to be reset. If the fault persists,
contact a qualied engineer for assistance.
Fan fault. is occurs if the fan has a mechanical
or electrical fault. To eliminate the 'fan fault'
the Reset button 'C' must be pressed. If the
fault persists, contact a qualied engineer for
assistance.
Flame sensing fault.is occurs in case of a
leak on the detection circuit or fault in the ame
control unit. e boiler can be reset in order
to allow a new ignition attempt. If the boiler
does not start, contact a qualied engineer for
assistance.
Return sensor fault. In this condition the boiler
does not correctly control the pump if set at
'Auto'. e boiler continues functioning but to
eliminate the fault, contact a qualied engineer
for assistance.
Set central heating ow temperature with
external sensor (optional)
Winter operating mode with external
sensor (optional)
During a request for central heating 'CH ON'
appears on the status indicator (item 6) and at
the same time as burner lights the ame presence
display switches on (item 8) together with the
output scale next to it. e displays (items 7 and
9) indicate the instantaneous outlet temperature
from the primary heat exchanger. In the central
heating mode, if the temperature of the water
contained in the system is sucient to heat the
radiators, the boiler will only function with the
activation of the boiler pump.
From this moment the boiler operates
automatically. With no demand for heat (central
heating or domestic hot water) the boiler goes
into 'stand-by' mode, equivalent to the boiler
being powered without the boiler alight.
18
3
64 7
SET
ESC
°C
°C




1
2
814
4
3
69 7
18
CH ON
MENU
°C
°C°C





Fig. 2-8
INSTALLATIONUSERMAINTENANCE
19 Alpha Intec 50CS
Push button control panel fault. is occurs
when the circuit board detects a fault on the
push button control panel. If normal conditions
are restored the boiler restarts without having to
be reset. If this fault persists, contact a qualied
engineer for assistance.
Insucient circulation. is occurs if there
is overheating in the boiler due to insucient
water circulating in the primary circuit, the
causes can be:
- low system circulation - check that no shut-o
devices are closed on the heating circuit and
that the system is free of air (deaerated).
- circulating pump blocked - free the circulating
pump.
If this phenomenon occurs frequently, contact a
qualied engineer for assistance.
Loss of remote control communication. is
occurs in the case of connection to a remote
control that is not compatible. Try the connection
procedure again by turning the boiler o and
then back on again. If the Remote Control is
still not detected on re-starting the boiler will
switch to local operating mode, i.e. using the
controls on the boiler itself. In this case the boiler
cannot activate the 'Central heating' function.
To make the boiler function in 'Heating' mode,
activate the 'Emergency' function present inside
the 'Customisations' menu (Section 2.14, P33).
If this phenomenon occurs frequently, contact a
qualied engineer for assistance.
Low temperature zone 2 sensor fault. If the
board detects a fault with the low temperature
zone 2 sensor, the boiler will not function in
that zone. A qualied engineer must be called.
Low temperature zone 3 sensor fault. If the
board detects a fault with the low temperature
zone 3 sensor, the boiler will not function in
that zone. A qualied engineer must be called.
Low temperature zone 2 safety thermostat
operation. During operation, if a fault causes
excessive overheating of the low temperature
zone 2, the boiler will not satisfy the requests
of that zone. If normal conditions are restored
the boiler restarts without having to be reset. A
qualied engineer must be called.
Low temperature zone 3 safety thermostat
operation. During operation, if a fault causes
excessive overheating of the low temperature
zone 3, the boiler will not satisfy the requests
of that zone. If normal conditions are restored
the boiler restarts without having to be reset. A
qualied engineer must be called.
IMG Bus communication loss. If due to a fault
on the boiler control unit, communication is lost
between the control unit and the zone control
unit or on the IMG Bus, the boiler will not satisfy
central heating requests. A qualied engineer
must be called.
Low power supply voltage. is occurs when
the supply voltage is lower than the allowed
limits for the correct operation of the boiler.
If normal conditions are restored, the boiler
re-starts without having to be reset. If this
occurs frequently, contact a qualied engineer
for assistance.
Loss of ame signal. is occurs when the boiler
has lit correctly but the burner ame switches
o unexpectedly, a new attempt at ignition is
performed and if normal conditions are restored,
the boiler does not have to be reset (this fault can
be checked in the list of errors P19 present in the
'M1' menu in Section 2.14.). If this phenomenon
occurs frequently, contact a qualied engineer
for assistance.
2.7 BOILER SHUTDOWN.
Switch the boiler off by pressing the “ ”,
button, disconnect the isolation switch outside of
the boiler and close the gas cock upstream from
the appliance. Never leave the boiler switched on
if le unused for prolonged periods.
2.8 RESTORE THE SYSTEM PRESSURE.
Periodically check the system water pressure.
e boiler pressure gauge should read a pressure
between 1 and 1.2 bar.
If the pressure falls below 1 bar (with the system
cold) restore normal pressure via the system lling
valve located in the right side of the boiler and
accessible behind the bottom cover (Fig. 2-8).
Note: Ensure the valve is closed aer lling.
If pressure reaches 3 bar the safety valve may
be activated.
In this case contact a qualified engineer for
assistance.
In the event of frequent pressure drops, contact
a qualied engineer to check for possible system
leakage.
2.9 DRAIN THE SYSTEM.
To drain the boiler, use the central heating drain
tap (Fig. 2-8).
Before draining, ensure that the lling valve is
closed.
2.10 DRAIN THE HOT WATER SYSTEM.
To drain the domestic hot water system, use the
hot water store drain tap (Fig. 2-8).
Note: Before performing this operation close the
boiler cold water inlet valve and open a hot water
tap in order to allow the store to drain.
2.11 ANTIFREEZE PROTECTION.
e boiler controls include an anti-freeze mode
that activates the pump and burner when the
system water temperature in the boiler falls
below 4°C.
e anti-freeze function is only guaranteed if:
- the boiler has a constant supply of gas and
electricity.
- the boiler is not in stand-by( ).
- the boiler ignition has not locked out.
- the boiler essential components are not faulty.
In the case of prolonged inactivity (second
home), we recommend that:
- the electricity supply is disconnected.
- the central heating and boiler domestic hot
water circuits are drained. In systems that
are drained frequently, lling must be carried
out with suitably treated water to eliminate
hardness that can cause lime-scale.
2.12 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.13 DECOMMISSIONING.
In the event of permanent shutdown of the boiler,
contact a qualied engineer for the procedures
and ensure that the electrical, water and gas
supplies are shut o and disconnected.
Central heating drain tap
Hot water store drain tap

INSTALLATIONUSERMAINTENANCE
20Alpha Intec 50CS
2.14 PARAMETERS AND INFORMATION
MENU REFER ALSO TO FIG. 21.
By pressing the button 'D' it is possible to access
a menu divided into three main parts:
- 'M1' - Information.
- 'M3' - Customisations.
- 'M5' - Congurations, menu reserved for the
engineer and for which a password is required.
Turn the central heating temperature selector
switch (item 3) to scroll through the menu
items.
Press button 'D' to access the various levels of
the menu.
Press button 'C' to go back one level.
Level 1 Button Level 2 Button Level 3 Button Description
M1
D 
C
P11 D 
C
View the management soware version of the boiler P.C.B.
xx = soware display version
yy = ignition control soware version (burner control)
zz = P.C.B. soware version
P12 View the total operating hours of the boiler
P13 View the number of burner ignitions
P14
(with optional
external sensor
present)
- - -
(without optional
external sensor)
D 
C
P14/A View the current external temperature (optional external sensor used)
P14/B View the minimum external temperature recorded (optional external
sensor used)
P14/C View the maximum external temperature recorded (optional external
sensor used)
RESET
D
x
select
C
By pressing button 'D' the MIN and MAX temperatures measured are
zeroed
P15
D 
C
No display on this boiler model
P17 View the fan speed
P18 e value displayed does not aect this model
P19
View the last 5 events that caused a boiler shutdown. e sequential
number from 1 to 5 is indicated in the display (position 6) with the
relative error code in postion 7.
By pressing button 'D' repeatedly it is possible to view the operating
time and the number of ignitions at which the anomaly occurred
Information Menu. is menu contains various information relative to the boiler operation:
Customisation menu. is menu contains all
options that can be customised. (e rst item
of the various options that appears inside the
parameter is that selected by default).
Important: if the international language is to be
restored (A1), proceed as follows:
- press button 'D' to enter the configuration
menu.
- turn selector switch '3' to 'PERSONAL'.
- press button 'D' to conrm.
- turn selector switch '3' to 'DATI'.
- press button 'D' to conrm.
- turn selector switch '3' to 'LINGUA'.
- press button 'D' to conrm.
- turn selector switch '3' to 'A1'.
- press button 'D' to conrm.
At this point the international items indicated in
the menu tables appear on the display.
Level 1 Button Level 2 Button Level 3 Button Level 4 Button Description
M3
D 
C
P31
D 
C
AUTO
(Default) D
x
select
C
e display lights up when the burner
is ignited and when the controls are
accessed, it remains on for 5 seconds aer
the last operation performed
ON e display is always lit up
OFF
e display only lights up when the
controls are accessed and remains on for 5
seconds aer the last operation performed
P32/B
D 
C
ITALIANO D
x
select
C
All descriptions are given in Italian
A1
(Default)
All descriptions are given in
alphanumerical format
P33
D 
C
OFF D
x
select
C
In winter mode, by activating this
function it is possible to activate the
central heating function even if the
optional environmental thermostat (TA)
is out of service
ON
RESET
D
x
select
C
By pressing button 'D' the customisations
made are zeroed, restoring the factory ser
values