Ariston UNO Installation Instructions Manual

Installation
Instructions

Wall-hung
combination boiler
Type C Boilers

G.C.N:

LEAVE THESE INSTRUCTIONS
WITH THE END-USER

Country of destination: GB

MT2002CAL007701001

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/System Diagrams

2.12 Water Circuit Diagrams

3. COMMISSIONING

3.1 Initial Preparation

3.2 Control Panel

3.3 Removing the Front Panel

3.4 Initial Start up

3.5 Operational Adjustments

3.6 Combustion Analysis

3.7 Boiler Safety Systems

3.8 Draining the System

4. GAS ADJUSTMENTS

Gas Adjustment Table

4.1 Changing the Type of Gas

5. MAINTENANCE

6. MISCELLANEOUS

6.1 Wiring Diagram for Two Heating Zones

6.2 Wiring Diagram for Connection to an Ariston Unvented Cylinder

7. Technical Information

3

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 Manual.

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 Service Centre 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 table on the back page 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 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.

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 3.6) 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.

1. GENERAL
INFORMATION

1.1 GENERAL INSTRUCTIONS

4

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 gas pressures: ignition pressure, partial load and full load.
9 - Check the heating safety systems:

- safety device for maximum temperature;

- safety device for maximum pressure.
10- Check the gas safety systems:

- safety device for lack of gas or flame ionisation (detection electrode);

- safety device for gas cock.
11- Check the electrical connection (make sure it complies with the instructions in

this manual).
12- Check domestic hot water production efficiency (flow rate and temperature)
13- General check of the combustion by-products of the discharge/ventilation

system.
14- Check the general performance of the unit.

1
2

3

7

11

10

13

21

20

22

23

25

24

18 1914 15

8

6

4

9

12

5

17

LEGEND:

1. Flue connector

2. Air intake for twin pipe flue systems

3. Fan

4. Combustion chamber hood

5. Main heat exchanger

6. Main circuit temperature probe (flow sensor)

7. Combustion chamber

8. Combustion chamber insulation panel

9. Burner

10. Detection electrode

11. Ignition electrodes

12. Motorised diverter valve

13. Safety valve (3 bar)

14. Secondary heat exchanger

15. Gas valve

17. Domestic cold water inlet filter

18. Spark generator

19. Domestic hot water flow switch

20. Boiler drain valve

21. Circulation pump with automatic air release valve

22. Main circuit temperature probe (return sensor)

23. Expansion vessel

24. Air pressure switch

25. Combustion analysis intakes

1.2 OVERALL VIEW

FIG. 1.0

IN013A

5

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
Approved 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 regs.1989”.
Installation should also comply with the following British Standard Codes of
Practice:

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. Wir ing
Regulations, and in Scotland, the electrical provisions of the Building
Regulations applicable in Scotland, with respect to the installation of the
combined 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 boiler 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.

There are no limitations with respect to ventilation and the volume of the
room itself.The boiler must be installed on a solid, permanent wall to prevent
access to the electrical parts (when live) through the aperture on the back
frame.

2.1 REFERENCE STANDARDS

2. INSTALLATION

Low pressure
pipes BS 6891 1988

Boilers of rated input
not exceeding 60 kW BS 6798 1987

Forced circulation hot
water system BS 5449 1990

Installation of gas hot water
supplies for domestic purposes

( 2ndfamily gases) BS 5546 1990
Flues BS 5440-1 1990

Air supply BS 5440-2 1989

2.2 SITING THE APPLIANCE

6

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 in section 6, where the
maximum absorbed power is also indicated. Make sure
that the connections for the neutral and live wires
correspond to those indicated in the diagram. The
appliance electrical connections are situated on the
reverse of the control panel (see the servicing manual for
further information)

IMPORTANT!

In the event that the power supply cable 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; 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

85 mm

220 mm

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

68 65

400 135

116
120

700

15

25.2

40.2

35

67 67 65 68

acqua
gas

250

200 200

123,5 123,5

250

20

450

300

20

LEGEND:

A = Central Heating Flow (3/4”)
B = Domestic Hot Water Outlet (1/2”)
C = Gas Inlet (3/4”)
D = Domestic Cold Water Inlet (1/2”)
E = Central Heating Return (3/4”)

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. 2.0

F

IG. 2.1

F

IG. 2.2

*A minimum distance of 20mm is required to each side
of the boiler to allow removal of the outer casing.