Ariston GENUS User manual

User’s
Manual

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.
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Dear Customer,
Thank you for choosing an ARISTON boiler.
We guarantee that your boiler is a reliable and technically sound
product.
This User’s 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.
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 appliance 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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GENERAL DATA
Heating input max
Heating input min
Heating output max
Heating output min
Efficiency at Maximum Thermal Capacity (see installation instructions)
Efficiency at Reduced Thermal Capacity (see installation instructions)
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
Wattage Rating
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
13.2
9.4
2.6
230/50
150
X 4 D
20
30-37
29.8 (101707)
12.0 (40956)
27.1 (92492)
10.1 (34471)
91.6
88.3
82
42
3
1
7
56
36
6
0.2
15.6
11.2
2.6
230/50
150
X 4 D
20
30-37
33.0 (112629)
12.0 (40956)
30.3 (103414)
10.2 (34813)
92.0
88.6
82
42
3
1
7
56
36
6
0.2
17.3
12.4
2.6
230/50
150
X 4 D
20
30-37
Genus 23
TECHNICAL INFORMATION Genus 27 Genus 30
* Combination
versions only

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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
N) Fume Sensor L.E.D.
O) Heating System Pressure Gauge
Genus 23 MI Genus 27 RFFI SYSTEM
Genus 23/27/30 MFFI

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Installation, start-up, adjustments and maintenance must be
performed 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, 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 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
maintenance:
- Periodically check the system pressure using the pres-
sure guage “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 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.
- 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.
O
I
L

WINTER AND SUMMER OPERATING MODES
(FOR ALL MODELS)
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).
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START-UP PROCEDURE
LIGHTING
(FOR ALL MODELS )
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.
I
C
L
B
A

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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 then 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
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.
H
I
L

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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.
F
PRODUCTION OF HOT WATER
FOR DOMESTIC USE
(FOR ALL MODELS)
- 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
(FOR ALL MODELS)
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 medium
temperatures is preferable
(see figure) .
E
E
H

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SHUTDOWN PROCEDURE
(FOR ALL MODELS)
To turn off the main burner, simply press the On/Off
switch “L”; the green L.E.D. “I” will also turn off.
As a precautionary measure, it is recommended that
the gas cock located on the bottom of the boiler be
turned off as well.
TIME CLOCK
The steps marked with the symbol ‹are necessary to carry out a
switching program.
‹ PREPARING FOR OPERATION
Activate the “Reset” switch to reset the time switch to it’s default settings
(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
I
L
After approximately two seconds the following display appears:
‹
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 = Mon ....... 7 = Sun
Release the “ ” key.
Input time Enter minutes
Manual switch
Enter weekdays
Enter the hour
Weekdays blinks
Reset
Enter
switching time Summer and
winter time
setting

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The colon now blinks once a second.
AM/PM TIME DISPLAY
If you press the “+/-h” and “h” keys at the same time, the time display
switches into the AM/PM mode.
Notes: If you keep the “h” and “m” keys pressed down for more than 2
seconds, the display will enter fast forward scroll mode.
‹ ENTERING THE SWITCHING TIMES
If your entry is incomplete, the segments not yet
selected will blink in the display.
You have 20 memory locations available. Each
switching time takes up one memory location.
Keep pressing the “Prog” key until a free memory
location is shown in the display “-- : --”.
Program ON or OFF with the “”key:
“”= ON - “”= OFF.
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 days it is to be carried out
on by using the “Day” key.
When the day selection is left blank, the programmed switching instruction
operates at the same time every day.
1 2 3 4 5 6 7 Monday ..... Sunday
1 2 3 4 5 6 Monday ..... Saturday
1 2 3 4 5 Monday ..... Friday
1 2 3 4 5 6 7 Saturday ..... Sunday
1 Monday
..... (selection of single days)
7 Sunday
Store using the “”key or push “Prog” key if you are going to continue
programming. 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 necessary, once you have finished programming and have returned to the
current time display, by pressing the “”button, the timer will not
automatically switch to the current programmed status until the next timed
setting.You can put the timer into the correct mode with the “”key.

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ADDITIONAL FUNCTIONS
Switching from summer time to winter and vice versa.
Press the “+/-1h” key once.
MANUAL OVERRIDE KEY
With the “”key you can change the current switching settings at any
time.The switching program already entered is not altered.
= ON
= OFF
= OFF
= ON
= ON
= OFF
Automatic
Operation Manual Operation Continuous Operation
[ ]
The switching times
correspond to the
program entered.
If the current switching
mode is changed
manually, the next
switching time will be
carried out automatically
again according to the
entered switching program.
You can only return to
automatic mode from
the continuously ON and
continously OFF
switching modes by
pressing the “”key.
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
locations will be displayed, e.g. “Fr 20”. If all memory locations are
occupied, the display “Fr 00” appears.
CHANGING 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 “ Entering the
switching times
”.

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TECHNICAL DATA
Ambient temperature: - 10°C to + 55°C
Running reserve: 5 h (not for 1,5 V DC)
Memory locations: 20
Shortest switching time: 1 minute
Programmable: Every minute
Notes on storing switching times:
If you end your entry of the switching times by pressing the “Prog”key, the
switching time you have entered will be stored and the next memory
location displayed.
Entry of further switching times is also carried out as described in “ Entering
the switching times ”.
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.
DELETING INDIVIDUAL SWITCHINGTIMES
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 switching time is now erased and the current time is displayed.

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USEFUL INFORMATION AND
TROUBLESHOOTING
BOILER SHUTDOWN
The boiler unit is equipped with safety devices which intervene in certain
situations to shutdown the boiler.
Some of these situations are signalled by the unit and can be corrected by
the user.
SHUTDOWN DUE TO THE FAILURE OF THE
BURNERTO LIGHT AUTOMATICALLY
This anomaly is indicated by the red “B” L.E.D.
To reset the unit, press and then release the “A”button.
At this point, the electronic ignition system will attempt
to light the burner again.
If lighting failure occurs repeatedly, it is recommended
that you contact one of our Authorised Service Centres.
B
A
SHUTDOWN DUE TO OVERHEATING
This anomaly is signalled by the red “G” L.E.D.
The boiler shuts off because the safety thermostat
detected that the boiler temperature has reached
the temperature limit.
To reset the unit, wait until the boiler has cooled
and then press the “A” button.
If the safety thermostat shuts off the unit on a
frequent basis, contact one of our Authorised
Service Centres for assistance.
G
A

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SHUTDOWN DUE TO INSUFFICIENT
WATER CIRCULATION
This anomaly is indicated by the red “D” L.E.D.
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
“O” and, if it is less than 0.5 bar, consult your installer
for checking and refilling the system.
Then reset the unit by turning the boiler off and then
back on with the On/Off button “L”.
If this situation persists, contact one of our Authorised
Service Centres.
O
D
I
L
FLUE TEST FEATURE
(only for authorised personnel)
The “C” Summer/Winter/Flue Test selector knob can be
set to <>to bypass temperature adjustment on the
heating circuit for the purpose of analysing the fumes
produced by combustion.
To access this mode, open a water tap or taps so that the
flow rate is no less than 8 litres per minute.
Then press the “C” selector knob in and turn it from <>or <>to
the <>.
WARNING!
The flue test feature eliminates the slow-light feature.
This mode must only be selected by a qualified service engineer.
C

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MONITORING DEVICE
FOR FUME DISCHARGE
(For Genus 23 MI)
These units are equipped with a device that monitors the discharge of the
fumes produced by combustion and automatically shuts off the supply of
gas to the main burner for approximately 12 minutes if it detects that the
fumes have been discharged into the room where the unit is installed. The
shutdown of the unit is immediately signalled by the yellow
"N" L.E.D. which remains on for the entire shutdown period.
This period lasts approximately 12 minutes, after which time
the unit automatically resets to normal operation mode.
IMPORTANT!
In the event this safety device shuts off the system a number of times
in succession , it is recommended that the unit be turned off and one of
our Authorised Service Centres be contacted to inspect both the unit and
the room to determine whether there is proper ventilation and discharge of
the combustion fumes.
N

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NOTES NOTES

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 Hotline: [phone]
Cod. 23 99 84 1256 111 / B003 -
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