Ariston ecoCOMBI 27 MFFI User manual

End User
Manual
ecoCOMBI 27 MFFI
ecoSYSTEM 27 RFFI

2
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.
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.
1. GENERAL INFORMATION page. 3
2. CONTROL PANEL page. 4
3. OPERATING INSTRUCTIONS page. 4
4. USEFUL INFORMATION page. 6
5. OPERATING THE TIME SWITH page. 7
6. ADDITIONAL FUNCTIONS page. 8
TABLE OF CONTENTS 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 recommen-
dations 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 dis-
posal for all requirements.
GUARANTEE
The guarantee on this appliance is valid
for 24 months from the first day of installation.
Repairs to the electric, water or gas circuits
may be carried out only by your local authorised MTS
Servicing Centre.

3
GENERAL DATA
Thermal Capacity C.H.W. min/max kW 8.9 / 26.7 8.9 / 26.7
Thermal Capacity D.H.W. min/max kW 8.9 / 30 --------
Power for Hot Water Production min/max kW 7.8 / 23.6 --------
Efficiency at Nominal Thermal Capacity (30/50°C) % 94.0 94.0
CENTRAL HEATING
Temperature min/max (High Temperature range) °C 48 / 82 48 / 82
Temperature min/max (Low Temperature range) °C 30 / 75 30 / 75
Maximum Heating Pressure bar 3 3
Expansion Vessel Capacity l 6 6
DOMESTIC HOT WATER
Temperature min/max °C 36 / 56 --------
Pressure of Water for Domestic Use min/max bar 0.2 / 6 --------
Flow Rate ∆T=30 °C 12.5 --------
Flow Rate ∆T=35 °C 10.7 --------
ELECTRICAL DATA
Electrical Supply V/Hz 230 / 50 230 / 50
Power Consumption W 135 135
Protection of Electrical System IP 24D 24D
CATEGORY
Nominal Pressure/Natural Gas (G20) (boiler at maximum) mbar 20 20
Nominal Pressure/LPG (G30-31) (boiler at maximum) mbar 30 30
27 RFFI27 MFFI
TECHNICAL INFORMATION
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 informa-
tion 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 reg-
istration 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 neg-
ligent use.
Do not allow children or inexperienced persons to use the appliance without
supervision.
If you smell gas in the room, do not turn on light switches, 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 power supply by turning the external switch to “OFF”.

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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 indi-
viduals, 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 annu-
ally 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 “E” and make sure that the
pressure is between 1.0 and 1.5 bar (the blue part of the gauge) when the system is off and
cool.If the pressure is below the minimum recommended value, the pressure must be brought
into the acceptable range.Consult your installer for checking and refilling the system.
If the pressure level drops on a frequent basis, it is likely that there is a water leak in the sys-
tem. If this is the case, your installer must inspect the system.
- The outer panels of the boiler's case must only be cleaned with a damp cloth, do not use abra-
sive 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.
- If the water is exceptionally hard, install a water softener so that the efficiency of the boiler
remains the same over time, as this will consume less gas.
- To improve comfort levels and take full advantage of the heat produced by the boiler, it is nec-
essary that an external thermostat and an outdoor sensor be installed.
-When the boiler is not in use for prolonged periods shut it down by turning the knob “A” to the
off position and close the gas and water isolation valves.
(I
MPORTANT !) This will disable the anti-frost device - if the period of disuse is very cold it will also
be necessary to drain the heating system of water.
If you wish to leave the anti-frost device active, it is necessary to leave the boiler on:this will not
safeguard from possible "blocks" which may impair this function.
- It is good practice to clean and service the appliance and Central Heating System every year.
Call a CORGI registered gas installer.
E
UT009A
3. OPERATING INSTRUCTIONS
2. CONTROL PANEL
A. ON/OFF knob/selector knob for Summer/Winter
B. Domestic Hot Water Temperature Adjustment Knob
C. Central Heating Temperature Adjustment Knob
D. Time Clock (Optional for ecoSYSTEM)
E. Heating System Pressure Gauge
H. Reset Button
I. Multi-function Display
J. “COMFORT” Function L.E.D./heating only (ecoSYSTEM)
K. “COMFORT” Function Push-button/heating only (ecoSYSTEM)
A
CD029C
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ABC D E
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IJK
27 MFFI
P
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AC DE
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27 RFFI

5
C
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CD021C
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sum- winter
CD023C
CD021C
Start-up Procedure
Before starting the boiler, check the following:
- The water pressure on the pressure gauge “E”;
- 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 switch the boiler on, turn the knob “A” in summer “ ”or winter “
”position a centralised electronic control unit will automatically light the main burner
when needed without any intervention from the outside. If the burner does not light
within the pre-set safety time limit, the display will show an error code.
To reset the ignition system, the reset button “H” must be pressed. Should the sys-
tem 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.
Winter and Summer Operating Modes
The boiler is fitted with a selector knob “A” 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 pro-
viding heat or hot water for domestic use. The supply of domestic hot water
always takes precedence over central heating.
When the knob is set to “ ”, the boiler cuts out the heating system and only
provides domestic hot water (when needed).
Turning on the Heating
Turn the “A” selector knob to “ ”;
Regulate the temperature of the heating system water in the boiler by turning the
“C” knob.The temperature can vary between 42°C
and about 82°C; The temperature of the heating
system water in the boiler can be regulated on the
alpha-numerical display. With this type of installa-
tion, the heating thermostat acts on ambient tem-
perature directly.
Installation with an external thermostat:
Turn the “A” selector knob to “ ”;
Turn the thermostat knob “C” to the highest temperature setting.
In this instant the boiler is controlled by a time clock and outdoor sensor; COMO
(programmable thermostat) with or without an outdoor sensor;CCM with or with-
out outdoor sensor i.e depending on internal or external temperature. At that
point, the main burner will turn off and the circulation pump will stop (if a pump
overrun period has not been set, see section 3.6.6. of the “INSTALLATION
INSTRUCTIONS”).
Production of Domestic Hot Water
Turn on the power to the boiler turning the knob “A” to the summer
“ ”position
Turn the “B” knob to select the temperature for the hot water (between 44°C and
about 56°C depending on the flow rate of the water).
It is recommended that the temperature knob for the domestic hot water is not
set to a high temperature and then mixed with cold water. Setting the thermo-
stat to medium temperature is preferable
Comfort Function (27 MFFI)
he supply of water for domestic use can become more convenient by means of
the “COMFORT” function, which maintains the secondary exchanger at a pre-
set temperature when the boiler is not running; thereby allowing a quicker deliv-
ery of domestic water when required.This function is activated by pressing the
“K” button on the control panel.When the function is on, a green L.E.D. “J” on
the control panel will illuminate.
Note: If the “COMFORT” function is on during the pump overrun period, it will be
temporarily deactivated.The green L.E.D. “J” will remain on to indicate that the
boiler will resume the “COMFORT” mode once the pump overrun period is com-
plete.
J
K
AA
CD025C
CD027C
A
CD021C CD025C
AB
CD021C

6
Turning Off the Heating
Installation without an external thermostat:
To turn off the heating, turn the “A” selector knob to “ ”.The boiler will still
provide domestic hot water.
Installation with an external thermostat:
To turn off the heating, turn the “A” selector knob to “ ” The boiler will still
provide hot water for domestic use. With an external thermostat, there are a
number of ways to turn off the heating.For additional information, please consult
the relative manual.
DISPLAY: Viewing Normal Functions
When the system is operating, i.e. while the boiler is fulfiling its normal functions,the
left-hand display will show a series of letters indicating the following functions:
Diagnostics Stage (precedes all other functions):
0No Request for Heat
CHeating, Burner Off
C. Heating, Burner On
cPump Overrun for Heating
dWater for Domestic Use, Burner Off
d. Water for Domestic Use, Burner On
hPump Overrun for Water for Domestic Use
bStorage Cylinder, Burner Off (SYSTEM version)
b. Storage Cylinder, Burner On (SYSTEM version)
NOTE:the flashing dot on the left-hand display always indicates “burner off”;the
still dot indicates “burner on”.
The right-hand display (two-digit) shows:
- in heating mode: temperature of heating system flow;
- in domestic hot water mode: temperature domestic hot water.
Boiler Shutdown
The boiler is equipped with safety devices which intervene in certain situations
to shutdown the boiler. Some of these situations are signalled by the boiler and
can be corrected by the user.
Shutdown Due to Ignition Failure
This anomaly is indicated by “A01”on the display.To reset the boiler, press and
then release the “H” 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 “E03”on the display. The boiler has shutdown
because the safety thermostat detected that the boiler temperature has exceed-
ed the maximum limit.
To reset this state, wait until the boiler has cooled and press the button “H”.
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 “A21”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.
4. USEFUL INFORMATION
A
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7
5. OPERATING THE TIME SWITCH
Check the system pressure on the pressure gauge “E” 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 “H”.
Other Shutdown Situations
Should a shutdown situation indicated on the display by the following letters and
figures occur, E04, E05, E08, E20, E21, E22, E23, E56, E64, E66, E74, E99
contact one of our Authorised Service Centres.
If instead the display shows one of the shutdown situations indicated by the fol-
lowing letters and figures, A02, A03, A07, A19, A20, A22, A99, try resetting the
he step marked with the symbol “ ”are necessary to carry out a switching pro-
gram.
5.0 Preparing for Operation
5.1 Activate the “Res” switch (=RESET) to reset the time switch to its
default setting (activate using a pencil or similar pointed instrument). Do this:
-every time you wish to “reset” the time switch
-to erase all switching times and the current time of day.
After approximately two second the following display appears:
P
r
o
g
.
h
m
Day
Manual switch
Summer and
winter time
setting
Reset
Enter
weekday/s
Enter
the hours
Week-
days
flash
Enter
minutes
Enter
switching
times
Imput
time
5.2 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 = “Monday”..............7 = Sunday
- Release the “ ” key
The colon now blinks once a second.
Notes:
If you keep the “h” and “m” keys pressed down for more than 2 seconds,
the display will enter fast-forward scroll mode.

8
5.3 Entering the switching times
You have 20 memory Iocations available.Each switching time takes up one
memory location.
Keep pressing the“Prog”key until a free memory location is shown in the
display “– –:– –”.
Programme ON or OFF with the “ ” key:
“”= OFF; “ ”= ON
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 day(s) it is to be carried out
by using the “Day” key.
When the day seIection is left bIank, the programmed switching instruc-
tion operates at the same time every day
1 2 3 4 5 6 = Monday – Saturday
1 2 3 4 5 = Monday – Friday
6 7 =Saturday – Sunday
Selection of single days: 1 = Mon. .............. 2 =Tues.
Save the switching time with the “ ” key.
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” switch. If your
entry is incomplete, the segments not yet selected will blink in the dis-
play.
After programming is completed, and you return the timeswitch to the
current time display with the “ ” key, the timeswitch will not activate
any switching instruction required for the current time.You may need to
manually select the desired switching state with the “ ” key.
Thereafter, as the unit encounters further switching instructions in the
memory in real time, it will correctly activate all subsequent switching
instructions.
6.1Switching from summer time to winter time and vice versa
Press the “+/-1 h” key once
6.2 Manual Override Switch “ ”
With the “ ” you can chage the current switching setting at any time.
The switching program already entered is not altered.
6.3
Automatic Manual Continuous
Operation Operation Operation
The switching If the current You can only
times corres- switching mode is return to automatic
pond to the changed manually, mode from the
program the next switching continuously-ON
entered. time will be and continuously-
carried out auto- OFF switching
matically again modes by
according to the pressing the " "
entered switching key.
program.
= ON = OFF = Continuously ON
= ON = OFF = Continuously OFF
6.0 ADDITIONAL FUNCTIONS

9
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
Iocations will be displayed, e.g. “FR ”. If all memory locations are
occupied, the display “FR appears.
6.4Changing 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 point 4.3.
Notes on storing switching times:
If you end your entry of the switching times by pressing the “Prog” key,
then the switching time you have entered will be stored and the next
memory location displayed. Entry of further switching times is also car
ried out as described in point 4.3.
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.
6.5Deleting 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 switchi
ng time is now erased and the current time is displayed.
6.6 AM / PM time display
If you press the “+/-1h” and “h” keys at the same time, the time display
switches into the AM/PM mode (mostly used in English-speaking coun
tries).
6.7 Technical data
Connection see unit imprint
Switching capacity see unit imprint
Ambient temperature -10°C to +55°C
Running reserve 5 h at + 20°C
Memory Iocations 20
Shortest switching time 1 min.
Programmable every minute

10

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Manufacturer: Merloni TermoSanitari SpA - Italy
Commercial subsidiary: MTS (GB) LIMITED
MTS Building
Hughenden Avenue
High Wycombe
Bucks HP13 5FT
Telephone: [phone]
Fax: [phone]
Technical Service Hot Line: [phone]
099 84 1739 000