Ariston 32 MFFI, 28 MFFI User Manual

End User

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Manual

microGENUS HE 24 MFFI
microGENUS HE 28 MFFI
microGENUS HE 32 MFFI

Country of destination: GB

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

or proper installation, use and maintenance.

f
Remember to k
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

eep this manual in a safe place for future reference

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

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 author

ised engineer

.

2

1. GENERAL INFORMA

TION

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

Water (D.H.W.). This appliance

Hot

ust be used onlyfor the purpose for which it is

m

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.

ou smell gas in the room,

If y

do not tur

n 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.

ou are going away for a long period of time, remember to shut the mains gas tap or

If y
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 INFORMA

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
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

CA

TEGORY

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

Heating Pressure

TION

kW
kW

%

°C

bar

litres

°C

bar
l/min
l/min
l/min

V/Hz

W
IP

mbar

mbar

24 kW

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

28 kW 32 kW

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

82 - 42

230/50

28/30-37

87.1

3-0.7

7

56-36

6-0.2

17.5

12.5

2.5

148

X4D

20

3

* Warning! the flue analysis mode must

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EC

II

IJK

only be selected by a qualified service
engineer.

CONTROLPANEL

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

2. OPERATING INSTRUCTIONS

K

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:

iodically check the system pressure using the pressure gauge

er

P

-

“K”, mak

the pressure is between 1.0 and 1.5 bar (the blue part on the gauge) when the system

2

is off and cool. The display will indicate

EE 002

“

” 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.

e sure that

4

PL004D

EC EC

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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

ical power supply be disconnected and that the external gas cock be closed.If low

electr
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

PL007D

summer

PL009D

winter

PL009D

urn the selector knob

T

n

oon

“

indicate

” indicating that the boiler is ready to operate. The

“A” to the

“I” position. The display will

A

electronic control unit will ignite the burner, without any manual

vention but in response to the request for Domestic Hot Water

inter
or heating. If, after approximately 10 seconds, the burner has not
ignited, the boiler saf
display will indicate the fault code
system, the reset b
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

ety devices will shut off the gas and the

1

AA001

. To reset the ignition

utton

ust be pressed and released. Should

“D” m

PL004D

D

PL006C

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.
Keeping the knob

“C” at the “ ” position selects the ‘summer’

C

inverno

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.

C

PL007C

C

PL008D

It is possib

By positioning the indicator somewhere between min. and max., a temperature may

“C”.
be obtained which varies from approximately 45˚C to about 80˚C.

ater temper

The w

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
to obtain the best performance from the boiler and to allow the regulation of the external

PL008D

B

temperature to function efficiently.

Both in the winter and summer mode, the temperature of the Domestic Hot Water may be
adjusted b

ange from 36˚C to about 56˚C

r
of the knob between the min. and max. settings.
The water temperature in the primary circuit may be checked on the display.

le to set the temper

ature in the pr

EXTERNAL (ROOM) THERMOSTAT CONTROL

SETTING THE HOT WATER FOR DOMESTIC USE

y using the

“B” knob

ADJUSTING THE HEATING

ature of the Centr

y circuit ma

imar

al Heating system b

y be chec

ked on the display.

“C” knob, leaving it at max in order

or the water may be chosen in a

A deliv

.

y temper

er

ature f

, depending on the flow rate of the water and the position

y adjusting the knob

5

E

C

E

C

E

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II II

econom

ECONOMY/COMFOR

T 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

ort

y

conf

PL006D

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
secondar

y exchanger and in the primary exchanger is kept in a pre-heated condition,

thereby allowing a quicker delivery of Domestic Hot Water when required.

C

PL008D

A

PL004D

3.USEFUL INFORMATION
AND TROUBLESHOOTING

PL007D

TURNING OFF THE CENTRAL HEATING

To turn off the Central Heating, rotate the “C” knob to the “0” position.
The boiler will sta

y 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

witch (located outside the boiler) to the OFF position.

s

. Close the gas cock located under the boiler and turn the electricity supply

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 “
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.

AA 0011

” on the display. To reset the boiler, press

SHUTDOWN DUE TO OVERHEATING

This anomaly is indicated by “

AA 0033

” on the displa

The boiler has shutdo

.

y

wn
because the safety thermostat detected that the boiler temperature has
exceeded the maximum limit.

o reset this state, wait until the boiler has cooled and press the button

T

“D”.

If the safety thermostat operates on a frequent basis, contact one of our

PL055D

Authorised Service Centres.

SHUTDOWN DUE TO INSUFFICIENT WATER CIRCULATION

This anomaly is indicated by “

EE 0022

” on the displa

y.
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

PL012D

6

turning the boiler off and then back on by pressing the
button “D”.

K

Other Shutdo

wn 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 b

uthorised Service Centres.

A

utton

If the boiler shuts off again, contact one of our

“D”.

ANTI-FROST DEVICE

The boiler is fitted with a device which, in the event that the water temperature falls below

˚C the pump activates and runs until a temperature of 18˚C is attained. In the event that

8
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 po

- gas is being distributed.

wered electrically;

4.MAINTENANCE

5.CHANGE OF GAS TYPE

Schedule an annual maintenance check-up for the boiler with a CORGI registered

vice Engineer.

Ser
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.

7

6.TIME CLOCK

TECHNICAL DATA

UT011Ap

ANO

: the time clock is for central heating control only.

TE

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 e

- rotate the outer ring of the clock in a clockwise direction until the correct time of day

(24h) lines up with the arro

-

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):

Position “I” CONSTANT: in this position, the clock circuit is always

1.

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;

very day:

w on the clock (at approx. 2 o’clock position);

UT014A

Ambient
temperature:
Running
reserve:
Shortest
switching time
Programmable:Every 15 minutes

acturer:

uf

Man

- 10°C to + 55°C

150 h (not for 1.5 V DC)

: 15 minutes

Merloni

Position “O” HEATING OFF: in this position, the clock circuit is always

2.

open (switch off) and the boiler will therefore never ignite for heating;

3.

“Central” Position

programming set by the user is active.

ermoSanitari SpA - Italy

T

UT014A

PROGRAMMING ACTIVE: in this position, the

UT014A

Commercial subsidiary: MTS (GB) LIMITED

MTS Building

ue

en

Hughenden A

v
High Wycombe
Bucks HP13 5FT

Telephone: [phone]
Fax: [phone]

http://www.ariston.co.uk

net:

Inter
E-mail: [e-mail]

Customer Service: 0870 600 9888
Technical Service Hot Line: [phone]

Cod. 099841914000