Ariston EURO COMBI A/23 MFFI User manual

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Users
Manual
A/23 MFFI
A/27 MFFI

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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
B022
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 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 Logbook.
You can check your installer is CORGI registered by calling CORGI
direct on :- [phone].

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4B022
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 recommen-
dations 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.

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5
B022
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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6B022
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
40°50°60°70°80°
°C°C
MODELS A/23 - A/27 MFFI

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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 effi-
ciency 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.
7
B022
OPERATING INSTRUCTIONS
CAUTION
Installation, start-up, adjustments and maintenance must be perfor-
med 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, ani-
mals and personal property, for which the manufacturer will not be
held liable.
To ensure efficient and safe operation it is recommended that the boi-
ler 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 main-
tenance:
- Periodically check the system pressure using the pres-
sure 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

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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).
8B022
I
C
L
B
A

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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 re-
mains 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 tempe-
rature 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

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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 tem-
perature is preferable (see figure).
10 B022
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°CLower to - 5°C
From + 5°C
to - 5°C
°C
E
°C
E
H