Ariston Type C User manual

Installation
Instructions
Type C Boilers
G.C.N: 41-116-04
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
Country of destination: GB

This manual is an integral and essential part of the product. It should be kept with the
appliance so that it can be consulted by the user and our authorised personnel.
Please carefully read the instructions
and notices about the unit contained in
this manual, as they provide important
information regarding the safe
installation, use and maintenance of the
product.
For operating instructions please
consult the separate User’s Manual.
1. GENERAL
INFORMATION
2
TABLE OF CONTENTS 1. GENERAL INFORMATION
1.1 GENERAL INSTRUCTIONS
1.2 OVERALL VIEW
2. INSTALLATION
2.1 REFERENCE STANDARDS
2.2 SITING THE APPLIANCE
2.3 OVERALL DIMENSIONS
2.4 CLEARANCES
2.5 MOUNTING THE APPLIANCE
2.6 ELECTRICAL CONNECTION
2.7 GAS CONNECTION
2.8 WATER CONNECTIONS
2.9 FLUE CONNECTION
2.10 ROOM THERMOSTAT CONNECTION
2.11 ELECTRICAL DIAGRAMS
2.12 GAS AND WATER CIRCUITS
3. D.H.W. STORAGE CYLINDER
3.1 2 PORT AND 3 PORT VALVE INSTALLATIONS
3.2 DOMESTIC HOT WATER PRIORITY KIT
4. COMMISSIONING
4.1 INITIAL PREPARATION
4.2 CONTROL PANEL
4.3 REMOVING THE FRONT PANEL
4.4 INITIAL START UP
4.5 OPERATIONAL ADJUSTMENTS
4.6 COMBUSTION ANALYSIS
4.7 FUME DISCHARGE MONITORING
4.8 DRAINING THE SYSTEM
5. GAS ADJUSTMENTS
GAS ADJUSTMENT TABLE
5.1 CHANGING THE TYPE OF GAS
6. MAINTENANCE
7. TECHNICAL INFORMATION

3
1.1 GENERAL INSTRUCTIONS Read the instructions and recommendations in these Installation 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 our
Servicing Centre technicians or your installer may need to consult it in the future.
This is an appliance for the production of central heating (C.H.).
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 table in section 7 comply with the electric, water and gas mains of the
property.You will find the data plate on the reverse of the control panel.
The gas with which this appliance operates is also shown on the label at the bottom
of the boiler.
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 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 Centre 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 seals for the water connections;replace any faulty seals.
2 - Check the gas seals;replace any faulty gas seals.
3 - Visual check of the entire unit.
4 - Visual check of the combustion process or analysis of combustion by-products
(see section 4.5) and cleaning of the burner if needed.
5 - If called for by point. 3, dismantling and cleaning of the combustion
chamber.
6 - If called for by point. 4, dismantling and cleaning of the burner jets.
7 - Visual check of the primary heat exchanger:
- check for overheating in the blade assembly;
- clean the exhaust fan if needed.
8 - Adjustment of the flow rate of the gas:flow rate for lighting, partial load and full
load.
9 - Check of the heating safety systems:
- safety device for maximum temperature (overheat thermostat);
- safety device for maximum pressure (safety valve).
10- Check of the gas safety systems:
- safety device for lack of gas or flame ionisation (detection
electrode);
- safety device for gas cock.
11- Check of the electrical connection (make sure it complies with the instructions
in the manual).
12- General check of the combustion by-products of the discharge/ventilation
system.
13- Check of the general performance of the unit.

4
The technical information and instructions provided herein below are intended for the
installer so that the unit may be installed correctly and safely.
The installation and initial start up of the boiler must be by a CORGI Registered
Installer in compliance with the installation standards currently in effect, as well as
with any and all local health and safety standards i.e.CORGI .
This appliance must be installed by a competent installer in accordance with
current Gas Safety (installation & use) Regulations.
The installation of this appliance must be in accordance with the relevant
requirements of the current Gas Safety (installation & use) Regulations, the Local
Building Regulations, the current I.E.E. Wiring Regulations, the byelaws of the local
water authority, and in Scotland, in accordance with the Building Standards
(Scotland) Regulation and Health and Safety document No. 635 “Electricity at work
regulations 1989”.
Installation should also comply with the following British Standard Codes of Practice:
2.1 REFERENCE STANDARDS
2. INSTALLATION
1.2 OVERALL VIEW
FIG. 1.0
BS 7593:1992 Treatment of water in domestic hot water central
heating systems
BS 5546:1990 Installation of hot water supplies for domestic
purposes
BS 5440-1:1990 Flues
BS 5440-2:1989 Air supply
BS 5449:1990 Forced circulation hot water systems
BS 6789:1987 Installation of gas fired hot water boilers of rated
input not exceeding 60kW
BS 6891:1989 Installation of low pressure gas pipe up to 28mm
BS 7671:1992 IEE wiring regulations
BS 4814:1990 Specification for expansion vessels
BS 5482:1994 Installation of LPG
LEGEND:
1. Flue connector
2. Fan
3. Combustion chamber hood
4. Main heat exchanger
5. Safety thermostat
6. Combustion chamber
7. Combustion chamber insulation panel
8. Detection electrode
9. Ignition electrodes
10. Burner
11. Regulation thermostat
12. Frost thermostat
13. Pump pressure switch
14. Safety valve (3 bar)
15. Automatic By-pass
16. Gas valve
17. Spark generator
18. Boiler drain valve
19. Circulation pump with automatic air release valve
20. Expansion vessel
21. Air pressure take-off point
22. Air pressure switch
23. Combustion analysis points

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.
Fasten the boiler in place using the template and anchors supplied with the unit. It is
highly recommended that a spirit level be used to position the boiler so that it is
perfectly level.
For additional information, please consult the instructions contained in the
connection kit and the flue kit.
2.6 ELECTRICAL CONNECTION
2.5 MOUNTING THE APPLIANCE
132 132
CE
400 mm
300 mm
60 mm
450 mm
LEGEND:
A= Central Heating Flow (3/4”)
C= Gas Inlet (3/4”)
E= Central Heating Return (3/4”)
mm = Clearances
2.3 OVERALL DIMENSIONS
In order to allow for access to the interior of the boiler for
maintenance purposes, the boiler must be installed in
compliance with the minimum clearances indicated in FIG. 2.1
2.4 CLEARANCES
FIG. 2.1
5
2.2 SITING THE APPLIANCE 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, and in
Scotland, the electrical provisions of the Building Regulations applicable in Scotland,
with respect to the installation of the appliance in a room containing a bath or
shower.
Where a room-sealed appliance is installed in a room containing a bath or
shower the appliance and any electrical switch or appliance control, utilising
mains electricity should be situated so that it cannot be touched by a person
using the bath or shower.
The location must permit adequate space for servicing and air circulation around the
appliance as indicated in paragraph 2.4.
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.
A compartment 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.
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, permanent wall to prevent access from the rear.

6
The boiler operates with alternating current, as indicated in the
technical information table in section 7, 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 under the
inspection cover (see the servicing manual 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 “”
symbol;
- 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 2.12.
Warning, this appliance must be earthed.
External wiring to the appliance must be carried out by a competent person and be
in accordance with the current I.E.E. Regulations and applicable local regulations.
The microSYSTEM range of boilers are supplied for connection to a 230 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 (see section 2.2).
E
L
N
FIG. 2.2
2.8 WATER CONNECTIONS
2.7 GAS CONNECTION The local gas region contractor connects the gas meter to the service pipe.
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.
FIG. 2.4
VIEW OF THE BOILER CONNECTIONS
FIG. 2.3
A
D
LEGEND:
A= Central Heating Flow
C= Gas Inlet
E= Central Heating Return
F= Safety Valve
G= Pump transportation screw
(remove before igniting the boiler)
H= Automatic By-pass pipe
F
BC
E
SC004A

7
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 radiator valves within the
system.
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 and should be fitted at all low points. The taps must be at least 15mm
nominal size and manufactured in accordance with BS 2870:1980.
SAFETY VALVE DISCHARGE:
The discharge should terminate facing downward 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.
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 volume when the system is heated.
It can accept up to 6 litre (1.3 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. This should be located on the
return pipe work as close as possible to the pump inlet.
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.
FILLING:
A temporary 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. 2.4). The flexible hose must be
removed once the system has been filled.
RESIDUAL HEAD OF THE BOILER

8
Ø60/100 mm
FIG. 2.6
A
BC
D
E
F
G
J
K
HI
L
GF
The boiler is designed to be connected to a coaxial flue discharge system.
2.9 FLUE CONNECTIONS FLUE SYSTEM
The provision for satisfactory flue termination must be made in accordance with BS
5440-1.
The appliance must be installed so that the flue terminal is exposed to outside air.
The terminal must not discharge into another room or space such as an outhouse or
lean-to.
It is important that the position of the terminal allows a free passage of air across it at
all times.
The terminal should be located with due regard for the damage or discolouration that
might occur on buildings in the vicinity.
In cold or humid weather water vapour may condense on leaving the flue terminal.
The effect of such “pluming”must be considered.
If the terminal is less than 2 metres above a balcony, above ground or above a flat
roof to which people have access, then a suitable terminal guard must be fitted.
When ordering a terminal guard, quote the appliance model number.
A suitable terminal guard is available from:
TOWER FLUE COMPONENTS
Morley Road
Tonbridge
KentTN9 1RA
The minimum acceptable spacing from the terminal to obstructions and ventilation
openings are specified in FIG. 2.5.
T
ERMINAL P OSITION
mm
A - Directly below an openable window or other opening 300
B - Below gutters, soil pipes or drain pipes 75
C - Below eaves 200
D - Below balconies or car-port roof 200
E - From vertical drain pipes and soil pipes 75
F - From internal or external corners 300
G - Above ground or balcony level 300
H - From a surface facing a terminal 600
I - From a terminal facing a terminal 1200
J - From an opening in the car port
(e.g.door, window) into dwelling 1200
K - Vertically from a terminal in the same wall 1500
L - Horizontally from a terminal in the same wall 300
FIG. 2.5

Exhaust
Type
C12 (xx)
C32 (xx)
C42 (xx)
Restrictor
ø44 mm
L min = 0.5 m
L max = 1 m
Maximum
Extension
Exhaust/Air
L = 5 m
Risk of Condensation Forming
Coaxial
Systems
ø60/100
Piping not insulated
ø44 restrictor NO restrictor
NONE NONE
Piping insulated
ø44 restrictor NO restrictor
NONE NONE
TABLE 2.1
10 RFFI
To connect a room thermostat and/or time clock, it is necessary
to:
1. - Open the control panel as indicated in section 4.3;
2.- Remove screws “A” and remove the inspection cover from
the reverse of the control panel;
3.- For the room-thermostat connect the thermostat switching
wires to the position 5 and 6 and remove the wire link (for
three-wire thermostats connect the neutral to terminal N);
4. - For the time clock connect the clock switching wires to the
positions 3 and 4 and connect the clock motor electrical
supply to the terminals marked Land N.
Note: A frost thermostat is built-in to the appliance.
For connection to control systems with zone valves
for hot water cylinders see section 3.
2.10 ROOM THERMOSTAT
CONNECTION
A
9
IMPORTANT!
For all flue systems, a restrictor must
always be inserted into the boiler’s
flue connector; the restrictor must be
Ø 44 in diameter depending on the
length of piping indicated in TABLE
2.1.
FIG 2.9 and FIG 2.10 illustrate some of
the various designs for coaxial or twin
pipe flue systems.
For further information on
discharge/ventilation accessories, see
the FLUE PIPE ACCESSORIES MANUAL.
COAXIAL SYSTEMS
FIG. 2.9

2.11 ELECTRICAL DIAGRAM
10
FIG. 2.12
Legend: A - On/Off Switch
B - On/Off L.E.D.
C - Heating Switch
D - Heating L.E.D.
E - Reset Button
F - Ignition Failure (Lockout) L.E.D.
A01 - Pump Pressure Switch
A02 - Frost Thermostat
A03 - Modulator
A04 - Circulation Pump
A05 - Regulation Thermostat
A06 - External Control System
A07 - Time Clock Connector
A08 - External (Room) Thermostat
A09 - Air Pressure Switch
A10 - Fan
A11 - Overheat Thermostat
A12 - Spark Generator/Gas Valve Supply
A13 - Detection Electrode
Colours: Wh - White
Bl - Blue
Gry - Grey
Brn - Brown
Blk - Black
Rd - Red
Grn/Yll-Yellow/Green