Ariston Boiler 28 MFFI User Manual

End User  
Manual  
microGENUS HE 24 MFFI  
microGENUS HE 28 MFFI  
microGENUS HE 32 MFFI  
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Country of destination: GB  
1. GENERAL INFORMATION  
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 :- (01256) 372300.  
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  
28 kW  
32 kW  
24 kW  
GENERAL DATA  
Heating input max-min (nett)  
Heating output max-min (nett)  
Efficiency at Maximum Thermal  
Capacity (see installation instructions)  
CENTRAL HEATING  
331.1 - 13.3  
27 - 11.4  
86.7  
35 - 13.3  
30.5 - 11.3  
87.1  
kW  
kW  
%
26.7 - 12.2  
23.3 - 10.4  
87.4  
Operating Temperature max-min  
Maximum-Minimum Heating Pressure  
Built-in expansion vessel - Total  
capacity  
82 - 42  
3-0.7  
82 - 42  
3-0.7  
°C  
bar  
82 - 42  
3-0.7  
7
7
litres  
7
DOMESTIC HOT WATER  
Maximum-Minimum Temperature of  
Water for Domestic Use  
Working pressure max-min  
Flow rate T 25°C  
56-36  
6-0.2  
15.5  
11.0  
2.5  
56-36  
6-0.2  
17.5  
12.5  
2.5  
°C  
bar  
l/min  
l/min  
l/min  
56-36  
6-0.2  
13.4  
9.5  
Flow rate T 35°C  
Minimum flow rate  
2.5  
ELECTRICAL DATA  
Electrical Supply/ Frequency  
Power Consumption  
230/50  
148  
230/50  
148  
V/Hz  
W
230/50  
120  
Protection of Electrical System  
X4D  
X4D  
IP  
X4D  
CATEGORY  
Nominal Pressure  
Methane Gas (G20)  
Nominal Pressure  
Liquid Gas (G30-G31)  
20  
20  
mbar  
mbar  
20  
28/30-37  
28/30-37  
28/30-37  
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CONTROL PANEL  
I
J
K
E
C
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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  
* Warning! the flue analysis mode must  
only be selected by a qualified service  
engineer.  
K- Central Heating System Pressure Gauge  
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:  
K
- 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  
E 02  
is off and cool. The display will indicate E  
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.  
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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.  
PL004D  
- 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  
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indicate onindicating 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  
PL004D  
A01  
display will indicate the fault code A . 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.  
D
PL006C  
PL007D  
summer  
WINTER AND SUMMER OPERATING MODES  
estate  
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.  
C
PL009D  
inverno  
winter  
Keeping the knob “C” at the “  
operating mode, the simbol “  
” position selects the ‘summer’  
“ will illuminate. ‘Winter’ operating  
mode may be selected by positioning the knob “C” between the  
min. and max. settings. The simbol “ “ will illuminate.  
C
PL007C  
PL009D  
C
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.  
PL008D  
EXTERNAL (ROOM) THERMOSTAT CONTROL  
C
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.  
PL008D  
SETTING THE HOT WATER FOR DOMESTIC USE  
B
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.  
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ECONOMY/COMFORT MODE  
E
E
C
E
C
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.  
confort  
economy  
PL006D  
C
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.  
PL008D  
TURNING OFF THE BOILER  
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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.  
PL004D  
3.USEFUL INFORMATION  
AND TROUBLESHOOTING  
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 A 01on 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.  
PL007D  
SHUTDOWN DUE TO OVERHEATING  
This anomaly is indicated by A 03on 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.  
PL055D  
SHUTDOWN DUE TO INSUFFICIENT WATER CIRCULATION  
E 02  
This anomaly is indicated by “  
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  
K
of 1.0 bar by opening the water inlet valve. Then reset by  
turning the boiler off and then back on by pressing the  
PL012D  
button “D”.  
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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 ˚C, the diverter valve switches to Domestic Hot Water  
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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.  
4.MAINTENANCE  
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.  
5.CHANGE OF GAS TYPE  
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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  
6.TIME CLOCK  
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.  
UT011Ap  
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;  
UT014A  
TECHNICAL DATA  
Ambient  
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;  
temperature: - 10°C to + 55°C  
Running  
UT014A  
reserve:  
150 h (not for 1.5 V DC)  
Shortest  
switching time: 15 minutes  
Programmable:Every 15 minutes  
3.“Central” Position PROGRAMMING ACTIVE: in this position, the  
programming set by the user is active.  
UT014A  
Manufacturer:  
Merloni TermoSanitari SpA - Italy  
Commercial subsidiary: MTS (GB) LIMITED  
MTS Building  
Hughenden Avenue  
High Wycombe  
Bucks HP13 5FT  
Telephone: (01494) 755600  
Fax: (01494) 459775  
Customer Service: 0870 600 9888  
Technical Service Hot Line: (01494) 539579  

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