UsersManual

2

Dear Customer,

Thank you for choosing an ARISTON

boiler.

We guarantee that your boiler is a reliable

and technically sound product.

This User's Manual provides detailed

instructions and recommendations for

proper installation, use and maintenance.

Remember to keep this manual in a safe

place for future reference i.e. by the gas

meter.

Your local MTS Servicing Centre is at your

complete disposal for all requirements.

The guarantee on this appliance isvalid for 24 months from the first

day of installation.

Repairs to the electric, hydraulicor gas circuits may be carried outonly by your local authorised MTS

Servicing Centre.

Every attempt has been made to avoiderrors of any kind

in this User's Manual, the Managementinvites customers to inform

of any inaccuracies which they may find.This will help to improve our service

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TABLE OF CONTENTS

1. GENERAL INFORMATION page 4Technical Information page 5Control Panel page 6

2. OPERATING INSTRUCTIONS page 83. USEFUL INFORMATION

AND TROUBLESHOOTING page 144. MAINTENANCE page 165. CHANGE OF GAS TYPE page 16

6. TIME CLOCK page 17

IMPORTANT!Please read this manual carefully.For additional information, please consult the “Installation and ServicingInstructions.”Make sure to keep the manuals provided with the appliance so that theycan be used by the end-user, installer or our authorised engineer.

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1. GENERAL INFORMATION

MTS (GB) Limited support theinitiative. Your installer will give you, andshow you how to use, a logbook which willgive you important information about yourboiler, and heating system. Please havethis logbook to hand whenever youcontact a service engineer or us.All CORGI Registered Installers carry aCORGI ID card, and have a registrationnumber. Both should be recorded inyour boiler Logbook. You can checkyour installer is CORGI registered bycalling CORGI direct on :- (01256)372300.This is a combined appliance for theproduction of central heating (C.H.) anddomestic hot water (D.H.W.). Thisappliance must be used only for thepurpose for which it is designed. Themanufacturer declines all liability fordamage caused by improper or negligent

use.Do not allow children or inexperiencedpersons to use the appliance withoutsupervision.If you smell gas in the room, do not turnon light switches, use the telephone orany other object which might causesparks.Open doors and windows immediately toventilate the room.Shut the gas mains tap (on the gas meter)or the valve of the gas cylinder and callyour Gas Supplier immediately.If you are going away for a long period oftime, remember to shut the mains gas tapor the gas cylinder valve.

Before any intervention within theboiler it is first necessary to cut off theelectrical power supply by turning theexternal switch to “OFF”.This manual may be kept in the frontpanel of the boiler.

TECHNICAL INFORMATION

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GENERAL DATAHeating input max-minHeating output max-minEfficiency at Maximum Thermal Capacity (seeinstallation instructions)

CENTRAL HEATINGOperating Temperature max-minMaximum-Minimum Heating PressureBuilt-in expansion vessel - Total capacity

DOMESTIC HOT WATERMaximum-Minimum Temperature of Water for Domestic UseWorking pressure max-minFlow rate ∆T 25°CFlow rate ∆T 35°CMinimum flow rate

ELECTRICAL DATAElectrical Supply/ FrequencyPower ConsumptionProtection of Electrical System

CATEGORYNominal Pressure/Methane Gas (G20-G25)Nominal Pressure/Liquid Gas (G30-G31)

kWkW%

°Cbar

litres

°Cbar

l/minl/minl/min

V/HzWIP

mbarmbar

25.6-11.023.8-9.7

92.9

82-423-0.7

6

56-368-0.213.69.72.6

230/50140X4D

20-2530-37

23 kW29.8-12.027.8-10.5

93.5

82-423-0.7

6

56-368-0.2

??

2.6

230/50155X4D

20-2530-37

27 kW

6

CONTROL PANEL

23/27 MFFI

FR

025A

7

LEGEND:

A - On/Off knobB - Domestic hot water temperature

adjustment knobC - Central heating selection

(winter) and temperature adjustment knob

D - On/Off L.E.D. (green)E - Fume sensor L.E.D. (yellow)F - Ignition failure (lockout)

L.E.D. (red)G - “Economy/Comfort” mode

selection knobH - Ignition failure (lockout) and/or

overheat reset buttonI - Overheat L.E.D. (red)J - Low system water level

L.E.D. (red)

K - Central heating temperatureL.E.D (yellow)

L - Time clockM - Heating system pressure gauge

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2. OPERATING INSTRUCTIONSCAUTION

Installation, start-up, adjustmentsand maintenance must be performedby a competent person only, inaccordance with the current GasSafety (Installation & Use)Regulations and the instructionsprovided. Improper installation maycause damage or injury toindividuals, animals and personalproperty, for which the manufacturerwill not be held liable.To ensure efficient and safeoperation it is recommended thatthe boiler is serviced annually by acompetent person.If it is known or suspected that afault exists on the appliance, it mustnot be used until the fault has beencorrected by a competent person.

HELPFUL SUGGESTIONS

To get the most out of your boiler, wehave provided you with some usefuladvice on proper use andmaintenance:- Periodically check the system

pressure using the pressure gauge“M”, make sure that the pressure isbetween 1.0 and 1.5 bar (the bluepart on the gauge) when the systemis off and cool. The warning L.E.D.“L” will indicate if the pressure isbelow the minimum recommended

M

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value. Consult your installer forchecking and refilling the system.

- The outer panels of the unit's casemust only be cleaned with a dampcloth. Do not use abrasive cleaners.The control panel can be wiped witheither a damp or dry cloth. Spraypolishes must not be used on thecontrol panel surface or knobs. Caremust be taken in preventing anyliquid entering the appliance.

PRACTICAL TIPS

- If the water is very hard, it isrecommended that a water softenerbe added to the system so as toreduce the formation of limescale inthe boiler exchangers. This willensure that the efficiency of the unitremains the same over time,

reducing gas consumption andmaintenance costs.

- If the boiler should be out of use fora prolonged period, it isrecommended that the electricalpower supply be disconnected andthat the external gas cock be closed.If low temperatures are expected,the boiler and system pipe workshould be drained in order to preventfrost damage.

- To improve comfort and take fulladvantage of the heat produced bythe boiler, it is recommended that anexternal (room) thermostat beinstalled.

- It is good practice to clean andservice the appliance and centralheating system every year.Call an Authorised Service Centre.

IGNITION PROCEDURE

Turn the selector knob “A” to the “J”position. The green L.E.D. “D” will

illuminate indicating that the boiler isready to operate. The centralisedelectronic control unit will ignite theburner, without any manual interventionbut in response to the request fordomestic hot water or heating. If, afterapproximately 10 seconds, the burnerhas not ignited, the boiler safetydevices will shut off the gas and the redL.E.D. “F” illuminates. To reset theignition system, the reset “H” must bepressed and released. Should the

boiler fail to ignite a second time, checkthat the external gas cock is open. If theproblem persists, contact anAuthorised Service Centre.

WINTER AND SUMMER

OPERATING MODES

In the ‘winter operating mode’, theboiler will produce both central heatingand domestic hot water. In the ‘summeroperating mode’, the boiler will produceonly domestic hot water.Using the knobs on the control panel,

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FD A

RESET

H

UT011Aa UT011Aq

UT011Ac UT011Ad

the user can select winter or summeroperating mode. Keeping the knob “C”at the “0” position selects the summeroperating mode. Winter operatingmode may be selected by positioningthe knob “C” between the min. andmax. settings.

ADJUSTING THE HEATING

It is possible to set the temperature ofthe heating system by adjusting theknob “C”. By positioning the indicator

somewhere between min. and max., atemperature may be obtained whichvaries from approximately 45˚C toabout 80˚C.

The watertemperature inthe primary circuitmay be checked bymeans of the yellow L.E.D.s“K”.

EXTERNAL (ROOM) THERMOSTAT

CONTROL

If an external (room) thermostat isinstalled, it is recommended that thetemperature of the heating system beset by means of the “C” knob, leaving

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C

summer

C

winter

K

UT011Ae UT011Af

UT

011A

n

12

it at max in order toobtain the bestperformance fromthe boiler and toallow the regulationof the externaltemperature tofunction efficiently.

SETTING THE HOT WATER FOR

DOMESTIC USE

Both in the winter and summer mode,the temperature ofthe domestic hotwater may beadjusted by usingthe “B” knob. Ad e l i v e r y

temperature for the water may bechosen in a range from 36˚C to about56˚C, depending on the flow rate of thewater and the position of the knobbetween the min. and max. settings.

ECONOMY/COMFORT MODE

The selector knob“G” allows the userto choose theeconomy mode(position “E”) or thecomfort mode(position “C”).The economy modeis the normal statefor the operation ofthe boiler, since the domestic water isheated up only when a tap is turned on.

C

B

G

eco

no

my

com

fort

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The comfort mode is a specialoperating state, because the watercontained in the secondary exchangerand in the primary exchanger is kept ina preheated condition, thereby allowinga quicker delivery of domestic waterwhen required. The latter is thereforethe more convenient choice.

TURNING OFF CENTRAL HEATING

To turn off the central heating, rotatethe “C” knob to the “0” position.The boiler willstay in summermode, justp r o v i d i n gdomestic wateron request.

TURNING OFF THE BOILER

To turn the boiler off, rotate the selectorknob “A” to the “0” position (OFF); therespective green L.E.D. “D” will go off.Close the gas cock located under theboiler and turn the electricity supplyswitch (located outside the boiler) tothe OFF position.

C

A D

UT011Ae

UT011Ab UT011Aa

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3. USEFUL INFORMATION AND TROUBLESHOOTING

BOILER SHUTDOWN SITUATIONS

The boiler is equipped with safetydevices that intervene in certainsituations and shut it off. Most of thesesituations are communicated by meansof the L.E.D.s and at times the usermay be able to remedy them.

SHUTDOWN DUE TO IGNITION

FAILURE

In the event thatthe automaticignition of theburner hasfailed, the red

L.E.D. “F” will illuminate. In order toreset the ignition, the button “H” mustbe pressed and released. Should theboiler fail to ignite a second time, checkthat the external gas cock is open. If theproblem persists, contact anAuthorised Service Centre.

SHUTDOWN DUE TO OVERHEATING

In the event that the safety limit isexceeded for the temperature of thewater in the boiler’s primary exchanger,the thermostat shuts off the boiler andthe red L.E.D. “J” illuminates.To remedy this situation, wait a fewminutes to allow the exchanger to cooldown, then press and release the resetbutton “H”.If this situation occurs frequently,contact an Authorised Service Centre.

RESET

F

J

H

UT011Ai

15

SHUTDOWN DUE TO INSUFFICIENT

WATER CIRCULATION

If the red L.E.D. “L” isilluminated and theboiler is off, onepossible cause for thisstate is an insufficientpressure of water in the system.Check the system pressure on thepressure gauge “M” and if it is lessthan 0.5 bar, consult your installer forchecking and refilling the system.Then turn off and turn back on theboiler by means of the selector knob“A”. If the boiler does not start upagain and the L.E.D. “L” remainsilluminated, contact an AuthorisedService Centre.If there are frequent drops in pressure

within the system, have a plumbercheck the heating system for possiblewater leaks.

TEMPORARY SHUTDOWN DUE TO

DEFECTIVE DISCHARGE OF

EXHAUST FUMES

The boiler is fitted with safety devices,which in the event of a defectivedischarge of exhaust fumes,automatically interrupts the gas supply,thereby shutting off the boiler.The shut-off of the boiler is temporaryand is indicated by the illumination ofthe yellow L.E.D. “E” for a period ofabout 15 minutes.Once this time period has passed andthe discharge state of exhaust fumeshas returned to normal, the boilerautomatically turns back on.

L

UT011Al

IMPORTANT!If this situation occurs frequently,contact an Authorised Service Centre.so that they may check that the exhaustfumes are being expelled correctly andthat the area is ventilated properly.

ANTI-FROST DEVICE

The boiler is fitted with a device which,in the event that the water temperaturegoes below 5°C, the three-way divertervalve switches to domestic hot waterand the burner turns on at minimumpower until the water in the boiler hasreached a temperature of about 50°C.This device is only activated when theboiler is operating perfectly and- the system pressure is sufficient;- the boiler is powered electrically;- gas is being distributed.

4. MAINTENANCE

Schedule an annual maintenancecheck-up for the boiler with acompetent person.Correct maintenance always results insavings in the cost of running thesystem.

5. CHANGE OF GAS TYPE

Our boilers are designed to functioneither with Natural Gas (methane) orLPG gas. If you need to changeoverfrom one gas to the other, one of ourAuthorised Service Centres should becontacted.

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6. TIME CLOCK

NOTE: the time clock is for centralheating control only.The time clock is provided with 96switches, called riders, each of whichcovers a time interval of 15 minutes(four per hour).When a rider is switched from the

inside (off setting) to the outside of theclock border (on setting), the circuit isclosed (switch on) for a period of 15minutes and then the boiler starts if theroom thermostat (if installed) or theheating thermostat require heat(heating function on).

EXAMPLETo set the heating of your home inthe time interval from 7.00 am to9.30 am and from 7.00 pm to 10.00pm every day:

- rotate the outer ring of the clock in aclockwise direction until the correcttime of day (24h) lines up with thearrow on the clock (at approx. 2o’clock position);

- under no circumstances should theminute hand be moved manually;

- make sure all the switches, i.e. theriders, are placed on the inside of the

UT011Ap

18

clock border;- pull outward the riders for 7.00 am

and 9.30 am, and then all ridersbetween these two;

- repeat this for 7.00 pm and 10.00pm.Other heating intervals may be set inthe same way.The timer has approximately 150hours of battery back up for powerfailure.

The clock is provided with a selectorswitch with three positions (see figure):

1. Position “I”CONSTANT: in thisposition, the clockcircuit is alwaysclosed (switch on),therefore the boilerwill constantly be

on and will only shut off upon therequest of the room thermostat (ifinstalled) or the heating thermostat;

2. Position “O”HEATING OFF: inthis position, theclock circuit is alwaysopen (switch off) andthe boiler willtherefore never ignitefor heating;

3. “Central” PositionPROGRAMMINGACTIVE: in thisposition, theprogramming setby the user isactive.

UT014A

UT014A

UT014A

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TECHNICAL DATA

Ambient

temperature: - 10°C to + 55°C

Running

reserve: 150 h (not for 1.5 V DC)

Shortest

switching time: 15 minutes

Programmable: Every 15 minutes

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Co

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3998

4146

8112

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Manufacturer: Merloni TermoSanitari SpA - Italy

Commercial subsidiary: MTS (GB) LIMITEDMTS BuildingHughenden AvenueHigh WycombeBucks HP13 5FTTelephone: (01494) 755600Fax: (01494) 459775Technical Service Hot Line: (01494) 539579