Ariston A27 MFFI, A23 MFFI User Manual

Users

Manual

A/23 MFFI
A/27 MFFI

TABLE OF CONTENTS

1) GENERAL INFORMATION page 5

2) OPERATING INSTRUCTIONS page 8

3) TIME CLOCK page 11

4) USEFUL INFORMATION
AND TROUBLESHOOTING page 13

IMPORTANT

Please read this manual carefully.

For additional information, please consult the “Installation and Servicing

Instructions.”

Please ensure manuals provided are kept with the appliance so that they

can be used by the end-user, installer or our authorised engineer.

3

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MTS (GB) Limited support the , initiative. Your installer will give
you, and show you how to use, a logbook which will give you important
information about your boiler, and heating system. Please have this log­book 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 Logbook.
You can check your installer is CORGI registered by calling CORGI
direct on :- [phone].

4

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Dear Customer,

Thank you for choosing an ARISTON combination boiler.
We guarantee that your boiler is a reliable and technically sound
product.
This User’s Manual provides detailed instructions and recommen­dations for proper use.
Remember to keep this manual in a safe place for future
reference.
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 User’s 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 appliances is valid for 12

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.

5

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GENERAL DATA

Heating input max
Heating input min
Heating output max
Heating output min

Efficiency at Maximum Thermal Capacity (see installation manual)
Efficiency at Reduced Thermal Capacity (*)

CENTRAL HEATING

Operating Temperature max
Operating Temperature min

Maximum Heating Pressure
Minimum Heating Pressure

Built-in expansion vessel - Total capacity

DOMESTIC HOT WATER

Maximum Temperature of Water for Domestic Use
Minimum Temperature of Water for Domestic Use
Working pressure max
Working pressure min
Flow rate ∆T 25°C
Flow rate ∆T 35°C
Minimum flow rate

ELECTRICAL DATA

Electrical Supply/ Frequency
Power Consumption
Protection of Electrical System

CATEGORY

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

kW(Btu/h)
kW(Btu/h)
kW(Btu/h)
kW(Btu/h)

%
%

°C
°C

bar
bar

litres

°C
°C

bar

bar
l/min
l/min
l/min

V/Hz

W
IP

mbar
mbar

25.6 (87364)

11.0 (37539)

23.1 (78491)

9.2 (31396)

90.2

87.8

82
42

3
1
7

56
36

6

0.2

12.8

9.1

2.6

230/50

150

44

20

30-37

29.8 (101707)

12.0 (40956)

27.3 (92492)

10.1 (34471)

90.6/91.6

88.3

82
42

3
1
7

56
36

6

0.2

14.8

10.6

2.6

230/50

190

44

20

30-37

A/23 MFFI

TECHNICAL INFORMATION

A/27 MFFI

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LEGEND

A) Ignition Lockout Reset Button/Safety (Overheat)Thermostat Reset
B) Ignition Lockout L.E.D.
C) Selector Knob for Summer/Winter/Flue Analysis Modes
D) Low System Water Level L.E.D.
E) Temperature Adjustment Knob for Domestic Hot Water
F) Heating System Thermometer
G) Safety (Overheat)Thermostat Intervention L.E.D.
H) Adjustment Knob for Heating Temperature
I) On/Off L.E.D.
L) On/Off Switch
O) Heating System Pressure Gauge

MODELS A/23 - A/27 MFFI

40° 50° 60° 70° 80°

°C °C

recommended value. Consult your installer for checking and refilling the
system.

- The outer panels of the unit's case must only be cleaned with a damp
cloth. Do not use abrasive cleaners. The Control panel can be wiped with
a damp or dry cloth. Spray polishes must not be used on the control panel
surface or knobs.Care must be taken in preventing any liquid entering the
appliance.

- If the water is exceptionally hard, install a water softener so that the effi­ciency of the unit remains the same over time, as this will consume less gas.

- To improve comfort and take full advantage of the heat produced by the
boiler, it is recommended that an external thermostat be installed.

- If the boiler is not going to be used for an extended
period of time, turn off the supply of electricity to the
unit by pressing the On/Off switch

“L”.

The green L.E.D. “I” will turn off. Then turn off the
supply of gas to the unit itself.
It is good practice to clean and service the appliance
and central heating system every year.
Call an Authorised Service Centre.

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OPERATING INSTRUCTIONS

CAUTION

Installation, start-up, adjustments and maintenance must be perfor­med by a competent person only in accordance with the Gas Safety
(Installation & Use) Regulations (1984) 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 exits on the appliance, it must
not be used until fault has been corrected by a competent person

HELPFUL SUGGESTIONS

To get the most out of your boiler, we have provided you
with some useful advice on the proper use and main­tenance:

- Periodically check the system pressure using the pres­sure gauge

“O”, make sure that the pressure is between 1.0 and 1.5 bar

(the blue part on the gauge) when the system is off and cool.
The warning L.E.D.“D” will indicate if the pressure is below the minimum

O

I

L

START-UP PROCEDURE

LIGHTING

Before starting the unit, check the following:

- The water pressure on the pressure gauge “O”;

- That the gas cock and the inlet for domestic water are
open.

These models are equipped with electronic ignition which utilises contact
ionisation.
To make the boiler operational, simply press the On/Off switch

“L”.

The green L.E.D. “I” will then turn on.
At this point the boiler is ready for use, a centralised
electronic control unit will automatically light the main
burner when needed. If the burner does not light within
the pre-set safety time limit, the red

“B” L.E.D. will light

up. To reset the ignition system, the reset button

“A”

must be pressed. Should the system fail to light a
second time, check to make sure that the gas cock is
open. If the problem persists, contact one of our
Authorised Service Centres for assistance.

WINTER AND SUMMER OPERATING MODES

The boiler is fitted with a selector knob “C” which
allows you to switch between winter <>and
summer <>operating modes and vice versa.
When the knob is set to <>, the boiler can
serve the dual purpose of providing heat and/or hot
water for domestic use.
The supply of hot water for domestic use always
takes precedence over heating. When the knob is
set to <>,the boiler cuts out the heating system and only provides hot
water for domestic use (when needed).

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I

C

L

B

A

9

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TURNING ON THE BOILER

Installation without a room thermostat :

- Turn on the power supply to the boiler by pressing the

On/Off switch “L”; the green L.E.D. “I” will the turn on;

- Turn the “C” selector knob to <>;

- Regulate the temperature of the water in the boiler by

turning the “H” knob. The temperature can vary
between 42°C and about 82°C;

- Check the boiler temperature on the thermometer with

the yellow L.E.D.s “F”. With this type of installation, the
ambient temperature does not influence the operation
of the boiler and
the circulation
pump always re­mains in
operation.

I

L

°C

40° 50° 60° 70° 80°

C

H

F

Installation with a room thermostat:

- Turn the “C” selector knob to < >;

- Turn on the power supply to the boiler by pressing the

On/Off switch ”L”; the green L.E.D. will then turn on;

- Turn the thermostat knob “H” to the highest tempera-

ture setting.

- With this type of installation, the boiler is controlled by a room thermostat.
Therefore, it runs until the ambient temperature has reached the tempe­rature setting on the thermostat. At that point, the main burner will turn off
and the circulation pump will stop.

TURNING OFF THE BOILER

Installation without a room thermostat:

To turn off the heating, turn the “C” selector knob to
< >. The boiler will still provide hot water for domestic
use.

°C

H

I

L

PRODUCTION OF HOT WATER

FOR DOMESTIC USE

- Turn on the power to the boiler by pressing the

On/Off switch “L”;

- With these settings, the boiler is already ready for use,

regardless of the position of the “C” selector knob.

- Turn the "E" knob to select the temperature for the hot water (between
36°C and about 56°C depending on the flow rate of the water).

ADJUSTING THE TEMPERATURE OF

WATER FOR DOMESTIC USE

It is recommended that the temperature for the hot water
should not be set to high temperatures and then mixed
with cold water.Setting the thermostat to a medium tem­perature is preferable

(see figure).

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ADJUSTING THE HEATING TEMPERATURE

To economise on consumption while achieving the highest level of comfort,
the temperature adjustment knob is designed with three different heating
zones based on the temperature outside the home.
Rotate the knob “H” as shown below.

°C °C °C

From + 5°C
to + 15°C

Lower
to - 5°C

From + 5°C
to - 5°C

°C

E

°C

E

H

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 = Mon ....... 7 = Sun

Release the “”key.

SHUTDOWN PROCEDURE

To turn off the main burner, simply press the On/Off
switch “L”; the green L.E.D. “I” will also turn off.
As a precautionary measure, it is recommended that
the gas cock located on the bottom of the boiler be tur­ned off as well.

TIME CLOCK

The steps marked with the symbol  are necessary to carry out a swit-

ching program.

PREPARING FOR OPERATION

Activate the “Reset” switch to reset the time switch to it’s default setting
(activate using a pencil or similar pointed instrument). Do this:

- every time you wish to “Reset” the time clock;

- to erase all switching times and the current time of day.

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I

L

Input time Enter minutes

Manual switch

Enter weekdays

Enter the hour

Weekdays blinks

Reset

Enter

switching time

Summer and

winter time

setting

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The colon now blinks once a second.

AM/PM TIME DISPLAY

If you press the “+/-h”and “h” keys as the same time, the time display swit­ches into the AM/PM mode.
Notes: If you keep the “h” and “m” keys pressed down for more than 2
seconds, the display will enter fast forward scroll mode.

ENTERING THE SWITCHING TIMES

If your entry is incomplete, the segments not yet
selected will blink in the display.
You have 20 memory locations available. Each swit­ching time takes up one memory location.
Keep pressing the

“Prog” key until a free memory
location is shown in the display “-- : --”.
Program ON or OFF with the “”key:

“”= ON - “”= OFF.
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 days it is to be carried out
on by using the “Day” key.
When the day selection is left blank, the programmed switching instruction

operates at the same time every day.

1 2 3 4 5 6 7 Monday ..... Sunday

1 2 3 4 5 6 Monday ..... Saturday

1 2 3 4 5 Monday ..... Friday

1 2 3 4 5 6 7 Saturday ..... Sunday

1 Monday

..... (selection of single days)

7 Sunday

Store using the

“”key or push “Prog” key if you are going to continue

programming. 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” key.
If necessary, once you have finished programming, and have returned to
the current time display, by pressing the

“”button, the timer will not auto-

matically switch to the current programmed status until the next timed set­ting. You can put the timer into the correct mode with the “”key.

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ADDITIONAL FUNCTIONS

Switching from summer time to winter and vice versa.
Press the “+/-1h” key once.

MANUAL OVERRIDE KEY

With the “”you can change the current switching settings at any time.
The switching program already entered is not altered.

= ON

= OFF

= OFF

= ON

= ON

= OFF

Automatic

Operation

Manual

Operation

Continuous

Operation

[ ]

The switching times cor­respond to the program
entered.

If the current switching
mode is changed manual­ly, the next switching time
will be carried out auto­matically again according
to the entered switching
program.

You can only return to
automatic mode from
the continuously ON and
continously OFF swit­ching modes by pressing
the

“”key.

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
locations will be displayed, e.g. “Fr 20”. If all memory locations are occu­pied, the display “Fr 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 “Entering the swit-

ching times

”.

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USEFUL INFORMATION AND

TROUBLESHOOTING

BOILER SHUTDOWN

The boiler unit is equipped with safety devices which intervene in certain
situations to shutdown the boiler.
Some of these situations are signalled by the unit and can be corrected by
the user.

SHUTDOWN DUE TO THE FAILURE OF THE
BURNER TO LIGHT AUTOMATICALLY

This anomaly is indicated by the red “B” L.E.D.
To reset the unit, press and then release the “A” button.
At this point, the electronic ignition system will attempt
to light the burner again.
Repeat this procedure as needed. If lighting failure
occurs repeatedly, it is recommended that you contact
one of our Authorised Service Centres.

B

A

Notes on storing switching times:

If you end your entry of the switching times by pressing the “Prog”key, the
switching time you have entered will be stored and the next memory loca­tion displayed. Entry of further switching times is also carried out as descri­bed in “Entering the switching times”.
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.

TECHNICAL DATA

Ambient temperature: - 10°C to + 55°C
Running reserve: 5 h (not for 1.5 V DC)
Memory locations: 20
Shortest switching time: 1 minute
Programmable: Every minute

15

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SHUTDOWN DUE TO OVERHEATING

This anomaly is signalled by the red “G” L.E.D.
The boiler shuts off because the safety thermostat
detected that the boiler temperature has reached
the temperature limit.
To reset the unit, wait until the boiler has cooled
and then press the

“A” button.

If the safety thermostat shuts off the unit on a fre­quent basis, contact one of our Authorised Service
Centres for assistance.

G

A

NOTES

Cod. 23 99 84 1257 311 / B022 - bieffe Recanati

GROUP

Manufacturer: Merloni TermoSanitari SpA - Italy

Commercial subsidiary: MTS (GB) LIMITED

MTS Building
Hughenden Avenue
High Wycombe
Bucks HP13 5FT

Telephone: [phone]
Fax: [phone]
Internet: http://www.mtsgb.ltd.uk
E-mail: [e-mail]

Technical Service Hot Line: [phone]