Ariston microGENUS HE 24 MFFI User manual

End User
Manual
microGENUS HE 24 MFFI
microGENUS HE 28 MFFI
microGENUS HE 32 MFFI
Country of destination: GB
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TABLE OF CONTENTS
1. GENERAL INFORMATION page 3
Technical Information page 3
Control Panel page 4
2. OPERATING INSTRUCTIONS page 4
3. USEFUL INFORMATION AND TROUBLESHOOTING page 6
4. MAINTENANCE page 7
5. CHANGE OF GAS TYPE page 7
6. TIME CLOCK page 7
IMPORTANT!
Please read this manual carefully.
For additional information, please consult the “Installation and Servicing Instructions.”
Make sure to keep the manuals provided with the appliance so that they can be used by
the end-user, installer or our authorised engineer.
Dear Customer,
Thank you for choosing an ARISTON boiler.
We guarantee that your boiler is a reliable and technically sound product.
This 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 is valid for 24 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.
Every attempt has been made to avoid errors of any kind
in this manual, the Management invites customers to inform
of any inaccuracies which they may find.
This will help to improve our service

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MTS (GB) Limited support the initiative. Your installer will give you, and show
you how to use, a Log Book 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].
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.
Do not allow children or inexperienced persons to use the appliance without supervision.
If you smell gas in the room, do not turn light switches on or off, 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.
Before any intervention within the boiler it is first necessary to isolate the electrical
supply by turning the external switch to “OFF”.
TECHNICAL INFORMATION
GENERAL DATA
Heating input max-min (nett)
Heating output max-min (nett)
Efficiency at Maximum Thermal
Capacity (see installation instructions)
CENTRAL HEATING
Operating Temperature max-min
Maximum-Minimum Heating Pressure
Built-in expansion vessel - Total
capacity
DOMESTIC HOT WATER
Maximum-Minimum Temperature of
Water for Domestic Use
Working pressure max-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
kW
%
°C
bar
litres
°C
bar
l/min
l/min
l/min
V/Hz
W
IP
mbar
mbar
26.7 - 12.2
23.3 - 10.4
87.4
82 - 42
3-0.7
7
56-36
6-0.2
13.4
9.5
2.5
230/50
120
X4D
20
28/30-37
331.1 - 13.3
27 - 11.4
86.7
82 - 42
3-0.7
7
56-36
6-0.2
15.5
11.0
2.5
230/50
148
X4D
20
28/30-37
35 - 13.3
30.5 - 11.3
87.1
82 - 42
3-0.7
7
56-36
6-0.2
17.5
12.5
2.5
230/50
148
X4D
20
28/30-37
24 kW 28 kW 32 kW
1. GENERAL INFORMATION

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K
CONTROL PANEL
2. OPERATING INSTRUCTIONS CAUTION
Installation, start-up, adjustments and maintenance must be performed by a
competent person only, in accordance with the current Gas Safety (Installation &
Use) Regulations 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 exists on the appliance, it must not be used
until the 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
proper use and maintenance:
-Periodically check the system pressure using the pressure gauge “K”, 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 display will indicate “E
E0 02 2”if the pressure is below the minimum
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 either 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.
* Warning! the flue analysis mode must
only be selected by a qualified service
engineer.
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EC
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IJK
LEGEND:
A- On/Off Button
B- Domestic Hot Water Temperature Adjustment
C-Central Heating Temperature Adjustment
D-Reset Button/Flue Test analysis mode*
E- Comfort Mode Selector
F- Summer Mode LED (Green)
G- Ignition/Overheat Lockout LED (Red)
H- Central Heating (Winter Mode) LED (Green)
I-Digital Display (Fault Code/Water Temperature)
J- Time Clock
K- Central Heating System Pressure Gauge

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PRACTICAL TIPS
- If the water is very hard, it is recommended that a water softener be added to the
system so as to reduce the formation of limescale in the boiler exchangers. This will
ensure that the efficiency of the unit remains the same over time, reducing gas
consumption and maintenance costs.
- If the boiler should be out of use for a prolonged period, it is recommended that the
electrical power supply be disconnected and that the external gas cock be closed. If low
temperatures are expected, the boiler and system pipe work should be drained in order
to prevent frost damage.
- To improve comfort and take full advantage of the heat produced by the boiler, it is
recommended that an external (room) thermostat be installed.
- It is good practice to clean and service the appliance and central heating system every
year. Call an Authorised Service Centre.
IGNITION PROCEDURE
Turn the selector knob “A” to the “I” position. The display will
indicate “o
on n”indicating that the boiler is ready to operate. The
electronic control unit will ignite the burner, without any manual
intervention but in response to the request for Domestic Hot Water
or heating. If, after approximately 10 seconds, the burner has not
ignited, the boiler safety devices will shut off the gas and the
display will indicate the fault code A
A0 01 1. To reset the ignition
system, the reset button “D” must be pressed and released. Should
the boiler fail to ignite a second time, check that the external gas cock
is open. If the problem persists, contact an Authorised Service Centre.
WINTER AND SUMMER OPERATING MODES
In the ‘winter’ operating mode, the boiler will produce both Central
Heating and Domestic Hot Water. In the ‘summer’ operating mode,
the boiler will produce only Domestic Hot Water.
Using the knobs on the control panel, the user can select ‘winter’
or ‘summer’ operating mode.
Keeping the knob “C” at the “ ” position selects the ‘summer’
operating mode, the simbol “ “ will illuminate. ‘Winter’ operating
mode may be selected by positioning the knob “C” between the
min. and max. settings. The simbol “ “ will illuminate.
ADJUSTING THE HEATING
It is possible to set the temperature of the Central Heating system by adjusting the knob
“C”.By positioning the indicator somewhere between min. and max., a temperature may
be obtained which varies from approximately 45˚C to about 80˚C.
The water temperature in the primary circuit may be checked on the display.
EXTERNAL (ROOM) THERMOSTAT CONTROL
If an external (room) thermostat is installed, it is recommended that the temperature of
the Central Heating system be set by means of the “C” knob, leaving it at max in order
to obtain the best performance from the boiler and to allow the regulation of the external
temperature to function efficiently.
SETTING THE HOT WATER FOR DOMESTIC USE
Both in the winter and summer mode, the temperature of the Domestic Hot Water may be
adjusted by using the “B” knob.A delivery temperature for the water may be chosen in a
range from 36˚C to about 56˚C, depending on the flow rate of the water and the position
of the knob between the min. and max. settings.
The water temperature in the primary circuit may be checked on the display.
IIII
A
PL004D
PL004D
EC EC
D
PL006C
PL007D
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PL009D
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ECONOMY/COMFORT MODE
The selector knob “E” allows the user to choose the economy mode (position “E”) or the
comfort mode (position “C”).
The economy mode is the normal state for the operation of the boiler, since the domestic
water is heated up only when a tap is turned on.
The comfort mode is a special operating state, because the water contained in the
secondary exchanger and in the primary exchanger is kept in a pre-heated condition,
thereby allowing a quicker delivery of Domestic Hot Water when required.
TURNING OFF THE CENTRAL HEATING
To turn off the Central Heating, rotate the “C” knob to the “0” position.
The boiler will stay in ‘summer’ mode, providing Domestic Hot Water on request.
TURNING OFF THE BOILER
To turn the boiler off, rotate the selector knob “A” to the “0” position (OFF); the display
will go off. Close the gas cock located under the boiler and turn the electricity supply
switch (located outside the boiler) to the OFF position.
BOILER SHUTDOWN SITUATIONS
The boiler is equipped with safety devices that intervene in certain situations and shut it
off.Most of these situations are signalled by means of the L.E.D.s and in some
circumstances the user may be able to remedy them.
SHUTDOWN DUE TO IGNITION FAILURE
This anomaly is indicated by “AA0011”on the display. To reset the boiler, press
and then release the “D” button.
At this point, the electronic ignition system will attempt to light the burner again.
Should the boiler fail to ignite a second time, check that the external gas
cock is open. If the problem persists, contact an Authorised Service
Centre.
SHUTDOWN DUE TO OVERHEATING
This anomaly is indicated by “AA0033”on the display.The boiler has shutdown
because the safety thermostat detected that the boiler temperature has
exceeded the maximum limit.
To reset this state, wait until the boiler has cooled and press the button “D”.
If the safety thermostat operates on a frequent basis, contact one of our
Authorised Service Centres.
SHUTDOWN DUE TO INSUFFICIENT WATER CIRCULATION
This anomaly is indicated by “EE0022”on the display.
One of the possible causes of this shutdown situation could be the lack of water
in the boiler or water circulation failure in the primary heating circuit.
Check the system pressure on the pressure gauge “K” and, if it is less than 0.5
bar, try bringing the system pressure up to a mean value
of 1.0 bar by opening the water inlet valve. Then reset by
turning the boiler off and then back on by pressing the
button “D”.
3.USEFUL INFORMATION
AND TROUBLESHOOTING
ECEC
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economy
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confort PL006D
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4.MAINTENANCE
5.CHANGE OF GAS TYPE
Other Shutdown Situations
Should a shutdown situation indicated on the display by the following letters and
figures occur, E04, E05, E06, E07, E08, E09, E20, E21, E33, E34 contact one
of our Authorised Service Centres.
If instead the display shows one of the shutdown situations indicated by the
following letters and figures, A77, A78, A97, A98, A99, try resetting the boiler by
pressing the reset button “D”.If the boiler shuts off again, contact one of our
Authorised Service Centres.
ANTI-FROST DEVICE
The boiler is fitted with a device which, in the event that the water temperature falls below
8
˚C the pump activates and runs until a temperature of 18˚C is attained. In the event that
the water temperature falls below 3 ˚C, the diverter valve switches to Domestic Hot Water
and the burner fires and runs on minimum power until a temperature of 33˚C is attained.
This device is only activated when the boiler is operating perfectly and
- the system pressure is sufficient;
- the boiler is powered electrically;
- gas is being distributed.
Schedule an annual maintenance check-up for the boiler with a CORGI registered
Service Engineer.
Correct maintenance always results in savings in the cost of running the system.
Our boilers are designed to function either with Natural Gas (methane) or L.P.G. gas. If
you need to changeover from one gas to the other, one of our Authorised Service Centres
should be contacted.

Cod. 099841914000
UT011Ap
ANOTE:the time clock is for central heating control only.
The time clock is provided with 96 switches, called riders, each of which covers a time
interval of 15 minutes (four per hour).
When a rider is switched from the inside (off setting) to the outside of the clock border (on
setting), the circuit is closed (switch on) for a period of 15 minutes and then the boiler
starts if the room thermostat (if installed) or the heating thermostat require heat (heating
function on).
EXAMPLE
To set the heating of your home in the time interval from 7.00 am to 9.30 am and from
7.00 pm to 10.00 pm every day:
- rotate the outer ring of the clock in a clockwise direction until the correct time of day
(24h) lines up with the arrow on the clock (at approx. 2 o’clock position);
-under no circumstances should the minute hand be moved manually;
-make sure all the switches, i.e. the riders, are placed on the inside of the clock border;
- pull outward the riders for 7.00 am and 9.30 am, and then all riders between these two;
- repeat this for 7.00 pm and 10.00 pm.
Other heating intervals may be set in the same way.
The timer has approximately 150 hours of battery back up for power failure.
The clock is provided with a selector switch with three positions (see figure):
1.Position “I” CONSTANT: in this position, the clock circuit is always
closed (switch on), therefore the boiler will constantly be on and will only
shut off upon the request of the room thermostat (if installed) or the
heating thermostat;
2.
Position “O” HEATING OFF: in this position, the clock circuit is always
open (switch off) and the boiler will therefore never ignite for heating;
3. “Central” Position PROGRAMMING ACTIVE: in this position, the
programming set by the user is active.
UT014A
UT014A
UT014A
TECHNICAL DATA
Ambient
temperature: - 10°C to + 55°C
Running
reserve: 150 h (not for 1.5 VDC)
Shortest
switching time: 15 minutes
Programmable:Every 15 minutes
6.TIME CLOCK
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.ariston.co.uk
E-mail: inf[email protected].com
Customer Service: 0870 600 9888
Technical Service Hot Line: [phone]