Ariston GENUS 30 Plus User guide

End User, Installation &
Servicing Instructions
Type C Boilers
G.C.N: 47-116-28
LEAVE THESE INSTRUCTIONS
WITH THE END USER
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1. General Information
2. Control Panel
3. How to Use
4. Anti-Frost Device
5. Maintenance
6. Trouble Shooting
7. Filling Instructions
8. Time Clock
8.1 Setting the Mechanical Clock
8.2 Setting the Digital Clock
9. General Information for the Installer
9.1 Overall View
10. Installation
10.1 Delivery
10.2 Reference Standards
10.3 Siting the Appliance
10.4 Clearances
10.5 Overall View
10.6 Mounting the Appliance
10.7 Electrical Connection
10.8 Gas Connection
10.9 Water Connections
11. Connecting the Flue
11.1 Flue Connections
11.2 Fitting the Coaxial Flue (Ø 60/100 mm -
Horizontal)
11.3 Fitting the Telescopic Flue (Ø 60/100 mm -
Horizontal)
11.4 Fitting the Coaxial Flue (Ø 60/100 mm - Vertical)
11.5 Fitting the Twin Pipe (Ø 80/80 mm)
12. Electrical Connections
13. Electrical System Diagrams
14. Water Circuit Diagrams
15. Commissioning
15.1 Initial Preparation
15.2 Completion
15.3 Removal and Fitting of the Case - Servicing
15.4 Control Panel
15.5 Initial Start-Up
15.6 Sequence of Operation
15.7 Operational Adjustments
15.8 Combustion Analysis
15.9 Boiler Safety Systems
TABLE OF CONTENTS
16. Gas Adjustments
16.1 Changing the Type of Gas
17. Maintenance
18. Servicing Instructions
18.1 Replacement of Parts
18.2 To Gain General Access
18.2.1 Removing the front panel
18.2.2 Removing the control panel
18.3 Access to the Control System
18.3.1 Removing the main PCB
18.3.2 Removing the display PCB
18.3.3 Removing the fuses
18.3.4 Removing the programmer
18.4 Access to the Sealed Chamber
18.4.1 Removing the sealed chamber front panel
18.4.2 Removing the combustion chamber front panel
18.4.3 Removing the burner
18.4.4 Removing the electrodes
18.4.5 Removing the burner manifold
18.4.6 Removing the main exchanger
18.4.7 Removing the air pressure switch
18.4.8 Removing the fan
18.5 Access to the Gas Valve
18.5.1 Removing the spark generator
18.5.2 Removing the gas valve
18.6 Access to the Water Circuit
18.6.1 Drain down
18.6.2 Removing the display PCB
18.6.3 Removing the heating return filter
18.6.4 Removing the by-pass
18.6.5 Removing the pressure relief valve (3 bar)
18.6.6 Removing the pressure relief valve (6 bar)
18.6.7 Removing the temperature & pressure relief
valve (7 bar)
18.6.8 Removing the pump
18.6.9 Removing the expansion vessel
18.6.10 Removing the overheat thermostat
18.6.11 Removing the heating temperature sensor
18.6.12 Removing the tank temperature sensor
18.6.13 Removing the DHW flow switch
18.6.14 Removing the DHW expansion vessel
18.6.15 Removing the flow limiter
18.6.16 Removing the tank
19. Fault Finding Guide
20. Short Spares List
21. Technical Information

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Dear Customer,
Thank you for choosing an ARISTON boiler.
We guarantee that your boiler is a reliable and technically sound product.
The following Instructions provide detailed instructions and recommendations for proper installation, use and maintenance.
Remember to keep this manual in a safe place for future reference e.g. by the gas meter.
Your local MTS Servicing Centre is at your complete disposal for all requirements.
MTS (GB) Limited
Every attempt has been made to avoid
errors of any kind in this instruction
manual, the Management invites
customers to inform of any
inaccuracies which they may find. This
will help to improve our service.
The guarantee on this appliance is valid
for 24 months from the first day of
installation.
Repairs to the electric, hydraulic or gas
circuits may be carried out only by your
local authorised MTS Servicing Centre.
IMPORTANT
Please read this manual carefully.
Please ensure this manual is kept with the appliance so that they can be used by the end-user, installer or our authorised engineer.
CAUTION
Installation, start-up, adjustments and maintenance must be
performed by a competent person only, in accordance with the
current Gas Safety (Installation & Use) Regulations and the
instructions provided. Improper installation may cause damage or
injury to individuals, animals and personal property, for which the
manufacturer will not be held liable.
To ensure efficient and safe operation it is recommended that the
boiler is serviced annually by a competent person.
If it is known or suspected that a fault exists on the appliance, it must
not be used until the fault has been corrected by a competent person.

4
MTS (GB) Limited support the initiative. Your installer will give
you, and show you how to use, a Log Book which will give you
important information about your boiler and heating system. Please
have this Log Book to hand whenever you contact a service engineer or
us.
All CORGI Registered Installers carry a CORGI ID card, and have a
registration number. Both should be recorded in your boiler Log
Book. You can check your installer is CORGI registered by calling
CORGI direct on :- [phone].
This is a combined appliance for the production of central heating (C.H.)
and domestic hot water (D.H.W.). This appliance must be used only
for the purpose for which it is designed. The manufacturer declines all
liability for damage caused by improper or negligent use.
Do not allow children or inexperienced persons to use the appliance
without supervision.
If you smell gas in the room, do not turn on or off light switches, use
the telephone or any other object which might cause sparks.
Open doors and windows immediately to ventilate the room.
Shut the gas mains tap (on the gas meter) or the valve of the gas
cylinder and call your Gas Supplier immediately.
If you are going away for a long period of time, remember to shut the
mains gas tap or the gas cylinder valve.
Before any intervention within the boiler it is first necessary to cut
off the electrical power supply by turning the external switch to the
off position.
1. GENERAL
INFORMATION
2. CONTROL PANEL
P1 P2
OFF ON
1234 1 234
00
R
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25
26
27
29
31
28
30
33
32
Legend:
25 - Selector Knob :
Central Heating and Hot Water
Hot Water Only
OStand-by
Central Heating Only
26 - D.H.W. temperature control knob
27 - C.H. temperature control knob
28 - Heating temperature indicator and diagnostic
indicator
29 - Green indicator - Power ON
30 - Orange indicator - Burner ON
31 - Red indicator - Lock out / flame failure
32 - Reset button
33 - Pressure gauge
34 - Time clock (digital model shown)
34

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3. HOW TO USE
P1 P2
OFF ON
1234 1 234
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25
26
27
2931
28
30
33
32
Switching on
1. Check that the pressure in the heating system is
adequate, i.e. the pressure gauge 33 shows 1 bar
minimum and 1.5 bar maximum.
2. Check that the gas service tap 39 (Fig. 3.3) is opened
(Figs. 3.1 and 3.2) and that the mains power is on,
the green indicator 29will light.
The boiler is now ready to use.
Note : If the boiler has been turned off for some time,
the presence of air in the gas pipe may result in a
lockout.
To obtain hot water only
-Turn the selector switch 25tothe « » position, the
green LED 29will light; the orange LED 30will light to
indicate that the burner is alight.
-To adjust the temperature of the domestic hot water,
it is necessary to rotate the control knob 26 «»
clockwise to increase and anti-clockwise to decrease
the temperature until the desired temperature is
achieved.
NOTE
On initial start-up, if the boiler has been switched off
for any period of time or when the storage tank is
emptied of hot water, it will be necessary for the
storage tank to be heated before hot water can be
drawn. It will also be necessary for occasional re-
heating of the storage tank to maintain the
temperature set on the hot water control knob 26 (this
will happen automaticall as long as the boiler is
powered, operating normally and the selector switch
25 is set to one of the hot water positions or
).
To obtain central heating and domestic hot water
-Turn the selector switch 25 to the « »position, the
green LED 29 will lightt; the orange LED 30 will light to
indicate that the burner is alight.
-Upon a demand for domestic hot water the operation of
the central heating will be interrupted until the hot water
tank has been reheated to the set temperature.
-The control knob 27 « » allows you to adjust the
water temperature in the central heating circuit
according to seasonal requirements.
-Turn the control knob 27:
-Clockwise in cold weather
-Anti-clockwise in mild weather (by turning the knob
fully anti-clockwise, the Central Heating will switch
off).
-The LEDs 28 will display the temperature of the
water in the central heating circuit.
-Furthermore, your home must be fitted with a room
thermostat, ensure it is set to the desired indoor
temperature.
-The orange LED 30 will light each time the burner
operates.
34
+
+
+
+
FIG.3.1 FIG.3.2
GAS COCK CLOSED GAS COCK OPEN
FIG.3.3
39

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To obtain central heating only
-Turn the selector switch 25 to the « » position, the green LED
29 will light.
- Ensure that the time clock is on (see SECTION 8), and that the room
thermostat is calling for heat.
-The control knob 27 « » allows you to adjust the water
temperature in the central heating circuit according to seasonal
requirements.
-Turn the control knob 27:
-Clockwise in cold weather
-Anti-clockwise in mild weather (by turning the knob too far, the
Central Heating will switch off).
-The LEDs 28will display the temperature of the water in the
central heating circuit.
-Furthermore, your home must be fitted with a room thermostat, set
it to the desired indoor temperature.
-The orange LED 30will light each time the burner operates.
Stopping the central heating
-Turn the selector switch 25 to the “ ” position. In this state the
boiler will only produce domestic hot water, alternatively, you can
turn the time clock off or turn the room thermostat down.
Stand-by mode
-Turn the selector switch 25 to the «O»position, the green LED 29
will remain alight. The appliance will remain in stand-by mode
unless the anti-frost device is activated.
Turn off the appliance*
-Turn the selector switch 25 to the «O»position
-Turn off the external power supply to the boiler.
* NOTE: IN THIS STATE THE APPLIANCES ANTI-FROST DEVICE IS INACTIVE
The boiler is fitted with a device, which in the event that the water
temperature falls below 8oCthe pump activates and runs until a
temperature of 18oCis attained. In the event that the water
temperature falls below 3oC, the diverter valve switches to Domestic
Hot Water and the burner fires on minimum power until a
temperature of 33oCis attained.
This device is only activated when the boiler is operating perfectly
and
-the system pressure is sufficient;
- the boiler is powered electrically;
- gas is available.
Schedule an annual maintenance check-up for the boiler with a
CORGI registered Service Engineeer in the UK and with a competent
person as described in I.S.813 for IE.
Correct maintenance always results in savings in the cost of running
the system.
4. ANTI-FROST DEVICE
5. MAINTENANCE

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6. TROUBLE
SHOOTING Incorrect functions are signalled by the diagnostic
indicator LED 31 display flashing. Contact your local
authorised Servicing Centre (unless a low water fault is
indicated, in which case refer to Section 7 for filling
instructions).
P1 P2
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1234 1 234
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7. FILLING
INSTRUCTIONS A method for initially filling the system and replacing lost
water during servicing and initial filling (in accordance with
current Water Regulations), is provided as an integral part
of the connection kit (see Fig. 7.1).
To fill the system and replace lost water it is necessary to
proceed as follows:
- Switch off the power to the boiler;
- Ensure that the flexible hose is connected to both the
cold water inlet connection and the C.H. flow
connection;
- Open the black lever on the valve for the C.H. return
connection and slowly open the black handle on the
valve for the cold water inlet until water is heard
passing through the valves;
- Once the pressure gauge 33 (Fig. 6.1) reads between
1and 1.5 bar close the levers on both the cold water
connection and the C.H. return connection
- Switch the power to the boiler back on.
NOTE:THE FLEXIBLE HOSE MUST BE REMOVED ONCE THE
SYSTEM HAS BEEN FILLED.
FIG.7.1
33
FIG.6.1

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8. TIME CLOCK
1.General layout
The mechanical clock covers a 24 hour period. Each tappet represents
15 minutes A(Fig. 4). An override switch is located on the clock B (Fig
8.1).
2.To set the time
To set the time of day, grasp the outer edge of the dial and turn slowly
clockwise until the correct time is lined up with the arrow C(Fig. 8.1).
3. To Set the "On" and "Off" times
The clock uses a 24hours system. e.g. 8 = 8.00 am and
18 = 6.00 pm "ON" periods are set by sliding all tappets between the
"ON" time and the "OFF" time to the outer edge of the dial.The tappets
remaining at the centre of the dial are the "OFF" periods.
4. For operation
Put the selector switch Bto the symbol to control the central heating
by the clock. Put the switch Bto «I»to select permanent operation or to
«0»to turn the central heating off permanently.
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
1616
1717
1818
1919
2020
2121
2222
2323
2424
99
66
1212
I
A
C
B
8.1 Setting the Mechanical Clock
FIG.8.1

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Manual switch
Summer and
winter time
setting
Reset
Enter
weekday/s
Enter
the hours
Week-
days
flash
Enter
minutes
Enter
switching
times
Imput
time
Automatic Manual Continuous
Operation Operation Operation
The switching If the current You can only
times corres- switching mode is return to automatic
pond to the changed manually, mode from the
program the next switching continuously-ON
entered. time will be and continuously-
 carried out auto- OFF switching
 matically again modes by
 according to the pressing the " "
 entered switching key.
 program.
= ON = ON = Continuously ON
= OFF = OFF = Continuously OFF
Operating the time switch
The steps marked with the symbol “ ” are necessary to carry out a
switching program.
Preparing for Operation
Activate the “Res” switch (=RESET) to reset the time switch to its
default setting (activate using a pencil or similar pointed instrument).
Do this:
-every time you wish to “reset” the time switch
-to erase all switching times and the current time of day.
After approximately two seconds the following display appears:
Enter current time and weekday
-Keep the “ ” key pressed down
During the summer time period press the +/- 1h key once.
Enter the hour using the “h” key
Enter the minutes using the “m” key
Enter the day using the “Day” key
1=“Monday”..............7 = Sunday
-Release the “ ” key.
Entering the switching times
You have 20 memory Iocations available. Each switching time takes
up one memory location.
Keep pressing the “Prog” key until a free memory location is shown in
the display “– –:– –”.
8.2 Setting the Digital Clock

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Programme ON or OFF with the “ ” key:
“ ”= OFF; “ ”= ON
Enter the hour using “h”
Enter the minutes using “m”
If a switching command is to be carried out every day (1 2 3 4 5 6
7) then store using the “ ” key, otherwise select the day(s) it is to
becarried out by using the “Day” key.
When the day seIection is left bIank, the programmed switching
instruction operates at the same time every day
123456 = Monday – Saturday
12345 = Monday – Friday
67 =Saturday – Sunday
Selection of single days: 1 = Mon. .............. 2 =Tues.
Save the switching time with the “ ” key.
The time switch enters the automatic operating mode and displays
the current time of day.
Begin any further entry of a switching time with the “Prog” switch. If
your entry is incomplete, the segments not yet selected will blink in
the display. After programming is completed, and you return the
time clock to the current time display with the “ ” key, the time
clock will not activate any switching instruction required for the
current time. You may need to manually select the desired
switching state with the “ ” key. Thereafter, as the unit
encounters further switching instructions in the memory in real time,
it will correctly activate all subsequent switching instructions.
Manual Override Switch “ ”
With the “ ” you can change the current setting at any time. The
switching program already entered is not altered.
Reading the programmed switching times
Pressing the “Prog” key displays the programmed switching times until
the first free memory location appears in the display “– – : – –”.
If you now press the “Prog” key once again, the number of free memory
Iocations will be displayed, e.g. “18”. If all memory locations are
occupied, the display “00”appears.
Changing the programmed switching times
Press the “Prog” key repeatedly until the switching time you want to
change is displayed. You can now enter the new data. See point
“Entering the switching times”.
Notes on storing switching times:
If you end your entry of the switching times by pressing the “Prog” key,
then the switching time you have entered will be stored and the next
memory location displayed.
In addition, a complete switching command is stored automatically
after around 90 seconds provided no other key is pressed. The time
switch then enters the automatic operating mode and displays the
current time again.
Deleting individual switching times
Press the “Prog” key repeatedly until the switching time you wish to
delete is shown in the display. Then set to “– –” using the “h” or “m” key
and keep the “ ”key pressed down for around 3 seconds. The
switching time is now erased and the current time is displayed.
AM / PM time display
If you press the “+/-1h” and “h” keys at the same time, the time display
switches into the AM/PM mode.

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Read the instructions and recommendations in these Installation and
Servicing Instructions carefully to ensure proper installation, use and
maintenance of the appliance.
Keep this manual in a safe place. You may need it for your own
reference while Servicing Technicians or your installer may need to
consult it in the future.
This is a combined appliance for the production of central heating (C.H.)
and domestic hot water (D.H.W.).
This appliance must be used only for the purpose for which it is
designed.
The manufacturer declines all liability for damage caused by improper
or negligent use.
No asbestos or other hazardous materials have been used in the
fabrication of this product.
Before connecting the appliance, check that the information shown on
the data plate and the Technical Information (Section 21) comply with
the electric, water and gas mains of the property. You will find the data
plate on the reverse of the control panel.
Do not install this appliance in a damp environment or close to
equipment which spray water or other liquids.
Do not place objects on the appliance.
Do not allow children or inexperienced persons to use the appliance
without supervision.
If you smell gas in the room, do not turn on or off light switches, use
the telephone or any other object which might cause sparks.
Open doors and windows immediately to ventilate the room.
Shut the gas mains tap (at or adjacent to the gas meter) or the valve of
the gas cylinder and call your Gas Supplier immediately.
If you are going away for a long period of time, remember to shut the
mains gas tap or the gas cylinder valve.
Always disconnect the appliance either by unplugging it from the
mains or turning off the mains switch before cleaning the appliance or
carrying out maintenance.
In the case of faults or failure,switch off the appliance and turn off the
gas tap. Do not tamper with the appliance.
For repairs, call your local Authorised Servicing Agent and request the
use of original spare parts. For in-guarantee repairs contact MTS (GB)
Limited.
Check the following at least once a year:
1- Check the seal of water connections, replacing the gaskets if
necessary.
2-Check the seal of the gas connections, replacing the gaskets if
necessary.
3- Check the general condition of the appliance and of the
combustion chamber visually.
4- Visual check of the combustion: clean burners if necessary.
5- With reference to point 3, dismantle and clean the combustion
chamber if necessary.
6- With reference to point 4, dismantle and clean the injectors if
necessary.
9. GENERAL INFORMATION
FOR THE INSTALLER

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7- Visual check of the primary heat exchanger:
-check for overheating of the exchangers fins;
-clean the exhaust side of the exchanger and fan if necessary.
8-Regulate the gas pressure, ignition pressure, partial flame, maximum
flame.
9- Check proper operation of the heating safety system:
-maximum safety temperature;
-maximum safety pressure.
10 - Check the proper operation of the gas safety system:
-gas or flame safety device;
- gas valve safety device.
11-Check that the electrical connections have been made in compliance
wit h the instructions shown in the Installation Instructions.
12 - Check the efficiency of the hot water supply (flow and temperature).
13 -Check pressure in the Domestic Expansion Vessel and top up as
necessary.
14 -Check manually by turning the test knob the Temperature & Pressure
Relief Valve.
15 -Check manually by turning the test knob the Expansion Relief Valve.
16 -Check discharge pipes from both the central heating and domestic hot
water for obstructions.
17 - Check general operation of the appliance.
18 - Check the exhaust system for the combustion products.
19 -Check all unvented domestic hot water controls and systems
NOTE: These checks are not exhaustive
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2
3
4
5
6
8
10
11
13
14
7
15
16
18
12
19
17
9
21
20
K
1.-Steel chassis
2.-Expansion vessel (primary)
3.-Fan
4.-Main heat exchanger made of copper
5.-Sealed chamber
6.-Stainless steel multi-gas burner
assembly comprising :
•removable burner manifold
•two ignition electrodes
•one flame detection electrode
7.-Gas section comprising :
•two safety valves
•one modulating valve
8.-Automatic air vent
9. - Stainless steel domestic hot water tank
10.-Pump
11. - Electrical box
12.-Igniter
13. - Overheating safety device
14.-Air pressure switch
15.-Tank thermistor
16.-Heating flow thermistor
17.-Heating return thermistor
18.-Three way valve
19. - Indirect coil
20.-DHW activator
21.-Hot water control thermistor
22.-DHW expansion vessel
23.-Programmer
24.-Safety valve T&P
K. - Flue kit fixing point (refer to Section 11)
9.1 OVERALL VIEW
22
23
24

13
The technical information and instructions provided herein below are
intended for the installer / Servicing Technician so that the unit may be
installed and serviced correctly and safely.
There will be two items:
1-The fully assembled boiler
2-Aseparately boxed connection kit
WATER REGULATIONS
In GB it is necessary to comply with the Water Supply (Water Fittings)
Regulations 1999, for Scotland, The Water Bylaws 2000, Scotland. The
Genus 30 Plus is an approved product under the Water Regulations.
To comply with the Water Regulations, your attention is drawn to The
Water Regulations guide published by the Water Regulations Advisory
Scheme (WRAS) gives full details of the requirements.
In IE, the requirements given in the current edition of I.S.813 and the
current Building Regulations must be followed.
BUILDING REGULATIONS
These are a statutory document and take priority over all other regulations
and recommendations. The installation of an unvented hot water storage
cylinder is classified as a "Controlled Service" and Regulation G3 applies.
To meet the requirements of the Regulation, installation of an unvented
system should be undertaken by a "competent installer".
All installations of unvented hot water storage systems having a capacity of
more than 15 litres should be notified to the relevant Local Authority by
means of Building Notice or by the submission of full plans. It is important
to note that it is a criminal offence to install an unvented hot water storage
system without notifying the Local Authority.
The installation of this appliance must be in accordance with the
relevant requirements of the Local Building Regulations, the current
I.E.E. Wiring Regulations, the bylaws of the local water authority, in
Scotland, in accordance with the Building Standards (Scotland)
Regulation and Health and Safety document No. 635 “Electricity at work
regulations 1989” and in the Republic of Ireland with the current edition
of I.S. 813, the Local Building Regulations (IE).
C.O.S.H.H.
Materials used in the manufacture of this appliance are non-hazardous
and no special precautions are required when servicing.
Installation should also comply with the following British Standard
Codes of Practice:
10. INSTALLATION
10.2 Reference Standards
10.1 Delivery
BS 7593 Treatment of water in domestic hot water
central heating systems
BS 5546 Installation of hot water supplies for
domestic purposes
BS 5440-1 Flues
BS 5440-2 Air supply
BS 5449 Forced circulation hot water systems
BS 6798 Installation of gas fired hot water boilers
of rated input not exceeding 60kW
BS 6891 Installation of low pressure gas pipe up to
28mm
BS 7671 IEE wiring regulations
BS 7074 Specification for expansion vessels
BS 5482 Installation of L.P.G.

10.3 Siting the Appliance
14
and in the Republic of Ireland in accordance with the following
Codes of Practice:
WARNING!!
The addition of anything that may interfere with the normal
operation of the appliance without express written permission of
the manufacturer or his agent could invalidate the warranty. In GB
this could also infringe the GAS SAFETY (Installation and Use)
REGULATIONS.
In the Republic of Ireland the installation and initial start up of the
appliance must be carried out by a Competent Person in
accordance with the current edition of I.S.813 “Domestic Gas
Installations” and the current Building Regulations, reference
should also be made to the current ETCI rules for electrical
installation.
The appliance may be installed in any room or indoor area,
although particular attention is drawn to the requirements of the
current I.E.E. Wiring Regulations, in Scotland, the electrical
provisions of the Building Regulations applicable in Scotland, and
in the Republic of Ireland, the current edition of I.S.813, with
respect to the installation of the combined appliance in a room
containing a bath or shower. The location of the boiler in a room
containing a bath or shower should only be considered if there is
no alternative.
Where a room-sealed appliance is installed in a room
containing a bath or shower reference should be made to the
relevant requirements.
In GB this is the current I..E.E. WIRING REGULATIONS and
BUILDING REGULATIONS. In IE reference should be made to
the current edition of I.S.813 and the current ETCI rules.
If the boiler is to be sited into a timber framed building, reference
must be made to the current edition of the Institution of Gas
Engineers Publication IGE/UP/7 (Gas Installations in Timber
Framed Housing).
The location must permit adequate space for servicing and air
circulation around the appliance as indicated in Section 10.4.
The location must permit the provision of an adequate flue and
termination.
For unusual locations special procedures may be necessary.
BS 6798-1987 gives detailed guidance on this aspect.
Acompartment used to enclose the appliance must be designed
specifically for this purpose. No specific ventilation requirements
are needed for the installation within a cupboard.
This appliance is not suitable for outdoor installation.
I.S. 813 Domestic Gas Installations
The following BS Standards give valuable information;
BS5546 Installation of hot water supplies for
domestic purposes
BS5449 Forced circulation hot water systems
BS 7074 Specification for expansion vessels
BS 7593 Treatment of water in domestic hot water
central heating systems

15
10.5 Overall Dimensions
925
500
950
470
195
57
54 145

39
40
41
42
43
38
188
135
80
54 172 54
317
280
44
595
450mm minimum for 
servicing purposes
180
FIG.10.1
The type C appliances (in which the combustion circuit,
air vent intake and combustion chamber are air-tight
with respect to the room in which the appliance is
installed) can be installed in any type of room.
Secondary ventilation is not required with this boiler. The
boiler must be installed on a solid, non-combustible,
permanent wall to prevent access from the rear.
In order to allow for access to the interior of the boiler for
maintenance purposes, the boiler must be fitted with a
clearance of 450mm in front 400mm below the boiler and
200mm above the boiler, and installed in compliance with the
clearance requirements indicated in Fig. 10.1.
Legend:
39 = Gas service tap
40 = Heating return
41 = Heating flow
42 = Water service tap
43 = Tank hot water flow
38 = Water tank
discharge valve
44 = Central heating
discharge valve
10.4 Clearances

16
After removing the boiler from its packaging, remove the
template from the separate box containing the connection
kit. NOTE:Pay particular attention to any test water that may
spill from the appliance.
Place the template in the position the appliance is to be
mounted and after ensuring it is hanging squarely, use it to
drill the holes for the hanging bracket, connection kit and
flue pipe(s) NB: For further information relating to the flue
installation please refer to SECTION 11 FLUE CONNECTION.(If
the appliance is to be fitted on a wall of combustible
material, the wall must beprotected by a sheet of fireproof
material).
If the appliance is to be fitted into a timber framed building,
guidance should be sought from the Institute of Gas
Engineers document REF: IGE/UP/7.
10.6.1. Drill the wall and plug using those supplied with the
connections kit, position the hanging bracket and secure
with the wall bolts supplied, assemble the connection kit and
secure to the wall. NOTE:It is highly recommended that a
spirit level be used to position the appliance to ensure that it
is perfectly level.
10.6.2. Position the appliance on the hanging bracket and
connect the connection kit to the boiler connections. (see
also Sections 10.8 Gas Connections, 10.9 Water
Connections & FIG.10.2).
For safety purposes, have a competent person carefully
check the electrical system in the property, as the
manufacturer will not be held liable for damage caused by
the failure to earth the appliance properly or by anomalies in
the supply of power. Make sure that the residential electrical
system is adequate for the maximum power absorbed by the
unit, which is indicated on the rating plate. In addition, check
that the section of cabling is appropriate for the power
absorbed by the boiler.
The boiler operates with alternating current, as indicated in
the Technical Information table (Section 21), where the
maximum absorbed power is also indicated. Make sure that
the connections for the neutral and live wires correspond to
the indications in the diagram. The appliance electrical
connections are situated on the reverse of the control panel
(see the Servicing Instructions Section 18 for further
information).
Important!
In the event that the power supply cord must be changed,
replace it with one with the same specifications. Make the
connections to the terminal board located within the control
panel, as follows:
-The yellow-green wire should be connected to the terminal
marked with the earth symbol; make sure to re-use the
ferrule mounted on the other supply cord;
-The blue wire should be connected to the terminal marked
“N”;
-The brown wire should be connected to the terminal
marked “L”.
Note: The diagrams for the electrical system are indicated in
Section 13.
FIG.10.3
10.7 Electrical Connection
10.6 Mounting the Appliance
Legend:
39 =Gas service tap
40 =Heating return
41 =Heating flow
42 =Water service tap
43 =Tank hot water flow
38 =Water tank valve
44 =Heating valve
FIG. 10.2
39
40
41
38
44
42 43

17
10.8 Gas Connection
Warning, this appliance must be earthed.
External wiring must be correctly earthed, polarised and in
accordance with relevant regulations / rules. In GB this is the
current I.E.E. WIRING REGULATIONS. In IE reference should be
made to the current edition of the ETCI rules. This boiler is supplied
for connection to a 220 - 240 V~50 Hz supply.
The supply must be fused at 3 A.
The method of connection to the electricity supply must facilitate
complete electrical isolation of the appliance, by the use of a fused
double pole isolator having a contact separation of at least 3 mm in
all poles or alternatively, by means of a 3 A fused three pin plug
and unswitched shuttered socket outlet both complying with BS
1363.
The point of connection to the Electricity supply must be readily
accessible and adjacent to the appliance unless the appliance is
installed in a bathroom when this must be sited outside the
bathroom.
The local gas region contractor connects the gas meter to the
service pipe.
The gas installation should be in accordance with the relevant
standards. In GB this is BS6891 and in IE this is the current edition
of I.S.813.
The connection the the appliance is a 22mm copper tail located at
the rear of the gas service cock (Fig. 10.2).
If the gas supply for the boiler serves other appliances ensure that
an adequate supply is available both to the boiler and the other
appliances when they are in use at the same time.
Pipe work must be of an adequate size. Pipes of a smaller size than
the boiler inlet connection should not be used.
Central Heating
Detailed recommendations are given in BS 6798:1987 and BS
5449-1:1990, the following notes are given for general
guidance.
Pipe Work:
Copper tubing to BS EN 1057:1996 is recommended for water
pipes. Jointing should be either with capillary soldered or
compression fittings.
Where possible pipes should have a gradient to ensure air is
carried naturally to air release points and water flows naturally
to drain taps.
The appliance has a built-in automatic air release valve,
however it should be ensured as far as possible that the
appliance heat exchanger is not a natural collecting point for air.
Except where providing useful heat, pipes should be insulated
to prevent heat loss and avoid freezing.
Particular attention should be paid to pipes passing through
ventilated spaces in roofs and under floors.
By-pass:
The appliance includes an automatic by-pass valve, which
protects the main heat exchanger in case of reduced or
interrupted water circulation through the heating system, due to
the closing of thermostatic valves or cock-type valves within the
system.
10.9 Water Connections

18
System Design:
This boiler is suitable only for sealed systems.
Drain Cocks:
These must be located in accessible positions to permit the
draining of the whole system. The taps must be at least 15mm
nominal size an manufactured in accordance with BS 2870:1980.
Safety Valve Discharge (Primary Water):
The discharge should terminate facing downwards on the exterior
of the building in a position where discharging (possibly boiling
water & steam) will not create danger or nuisance, but in an easily
visible position, and not cause damage to electrical components
and wiring.
The discharge must not be over an entrance or a window or any
other type of public access.
Mains Water Feed - Central Heating:
There must be no direct connection to the mains water supply
even through a non-return valve, without the approval of the Local
Water Authority, and must be in accordance with water supply
regulations. Your attention is drawn to, for GB: Guidance G24.2
and recommendation R24.2 of the water regulations guide and for
IE: the current edition of I.S.813.
Filling:
Atemporary method for initially filling the system and replacing
lost water during servicing and initial filling (complying to current
water regulations and byelaws) is provided. The flexible hose
must be removed once the system has been filled.
Domestic Hot Water
Storage Discharge Pipe Work
1) The tundish must be installed directly below the discharge outlet
connection of the boiler. The tundish must also be in a position visible
to the occupants, and positioned away from any electrical devices.
The discharge pipe from the tundish should terminate outside in a
safe place where there is no risk to persons in the vicinity of the
discharge and to be of metal.
2) Discharge pipes from the temperature & pressure relief and
expansion relief valve are joined together within the appliance.
3) The pipe diameter must be at least one pipe size larger than the
nominal outlet size of the safety device unless it's total equivalent
hydraulic resistance exceeds that of a straight pipe 9m long.
i.e. Discharge pipes between 9m and 18m equivalent resistance
length should be at least 2 sizes larger than the nominal outlet size of
the safety device. Between 18m and 27m at least 3 sizes larger, and
so on.
Bends must be taken into account in calculating the flow resistance.
See fig. 10.4 (page 18) and Table 1 (page 19).
4) The discharge pipe must have a vertical section of pipe at least 300m
in length, below the tundish before any elbows or bends in the
pipework.
5) The discharge pipe must be installed with a continuous fall.
6) The discharge must be visible at both the tundish and the final point of
discharge, but where this is not possible or practically difficult; there
should be clear visibility at one or other of these locations. Examples
of acceptance are:
i) Ideally below a fixed grating and above the water seal in a trapped
gully.
ii) Downward discharges at a low level; i.e. up to 100mm above
external surfaces such as car parks, hard standings, grassed areas etc.
These are acceptable providing that where children may play or
otherwise come into contact with discharges, a wire cage or similar
guard is positioned to prevent contact, whilst maintaining visibility.

19
iii) Discharges at high level; I.e. into a metal hopper and metal down
pipe with the end of the discharge pipe clearly visible (tundish visible or
not).
Oronto a roof capable of withstanding high temperature discharges of
water 3m from any plastic guttering systems that would take such a
discharge (tundish visible).
iv) Where a single pipe serves a number of discharges, such as in
blocks of flats, the number served should be limited to not more than 6
systems so that any installation can be traced reasonably easily.
500 mm Max.
300 mm
Min.
Temperature & pressure
relief valve Metal discharge pipe (D1) from
temperature & pressure relief valve.
to tundish.
Metal discharge pipe (D2) from tundish
with continuous fall. See Table 2 and worked
example.
Tundish
Fixed grating
Trapped gulley
Discharge below
fixed grating.
(see page 6 for
alternative points
of discharge).
Fig.10.4
The single common discharge pipe should be at least one pipe size large
than the largest individual discharge pipe to be connected.
If unvented hot water storage systems are installed where discharges
from safety devices may not be apparent I.e. in dwellings occupied by
the blind, infirm or disabled people, consideration should be given to
the installation of an electronically operated device to warn when
discharge takes place.
Note: The discharge will consist of scalding water and steam. Asphalt,
roofing felt and non-metallic rainwater goods may be damaged by such
discharges.
Warning
The outlet from the temperature & pressure relief valve must not be
used for any other purpose.
The temperature & pressure relief valve must not be removed in any
circumstances. Any of the above will totally invalidate the warranty.
Note
The discharge from the central heating and domestic hot water systems
may be joined together after the tundish.
Air Release Points:
These must be fitted at all high points where air naturally collects
and must be sited to facilitate complete filling of the system.
The appliance has an integral sealed expansion vessel to
accommodate the increase of water value when the system is
heated.

20
It can accept up to 7l (1.5 gal) of expansion water. If the heating circuit
has an unusually high water content, calculate the total expansion and
add an additional sealed expansion vessel with adequate capacity.
Domestic Water:
The domestic water must be in accordance with the relevant
recommendation of BS 5546:1990. Copper tubing to BS EN
1057:1996 is recommended for water carrying pipe work and must be
used for pipe work carrying drinking water. The domestic hot water
temperature should be be adjusted to trip at 60˚C. This temperature
will prevent the formation of limescale in hard water areas.
Note: This appliance is capable of producing domestic hot water of
upto 70˚C. For extra security against scalding a thermostatic
blending valve may be installed on the domestic hot water
outlet.
Secondary Return:
The secondary return connection can be used as an option. A Non
Return Valve (not supplied) must be fitted to prevent back flow and a
Bronze Pump will be needed in conjunction with a Pipe Thermostat to
circulate the hot water (neither of which are supplied).
Valve outlet size Minimum size of
discharge pipe D1* Minimum size of discharge pipe D2*
from tundish
Maximum
resistance allowed,
expressed as a
length of pipe (i.e.
no elbow or bends)
Resistance created
by each elbow or
bend
G 1/2 15 mm 22 mm
28 mm
35 mm
Up to 9 m
Up to 18 m
Up to 27 m
0.8 m
1.0 m
1.4 m
G 3/4 22 mm 28 mm
35 mm
42 mm
Up to 9 m
Up to 18 m
Up to 27 m
1.0 m
1.4 m
1.7 m
G1 28 mm 35 mm
42 mm
54 mm
Up to 9 m
Up to 18 m
Up to 27 m
1.4 m
1.7 m
2.3 m
Worked Example:
The example below is for a G 1/2 Temperature & Pressure Relief valve
with a discharge pipe (D2) having 4 no. elbows and length of 7m from the
Tundish to the point of discharge.From Table 1
Maximum resistance allowed for a straight length of 22mm copper
discharge pipe (D2) from G 1/2 T & P valve is 9m.
Subtract the resistance for 4 no. 22mm elbows at 0.8m each = 3.2m.
Therefore the maximum permitted length equates to: 5.8m.
As 5.8m is less than the actual length of 7m therefore calculate the next
largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from
G1/2 T & P valve equates to: 18m.
Subtract the resistance for 4 no. 28mm elbow at 1.0m each = 4m.
Therefore the maximum permitted length equates to: 14m
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
Table 1. Sizing of copper discharge pipe “D2” for
common temperature valve outlet sizes.