Ariston Type C User manual

Country of destination: GB/IE
Installation, Servicing and
Operating Instructions
Type C Boilers
SYSTEM A 24 MFFI G.C.N: 41-116-14
SYSTEM A 30 MFFI G.C.N: 41-116-15
LEAVE THESE INSTRUCTIONS
WITH THE END USER

2
These instructions are suitable for the SYSTEM A boilers :
MTS (GB) Limited supports Benchmark, the heating industry code to ensure the correct installation, commissioning and
servicing of domestic central heating systems.
To The Householder
Make sure that your installer completes Section 24 of this manual (page 61), this provides a record of the commissioning
of your boiler.
It contains important information about your particular installation that may be required by service engineers. It will also provide
contact details for the installer should you need guidance in the use of this appliance or if there are any problems.
As with your car, your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service
check. The service history of the appliance must be recorded in Section 25 of this manual (page 62).
In the unlikely event of any problems with your boiler or system you should first contact your installer. If your installer cannot
resolve the problem he should telephone our national service helpline.
Acharge may be made if Ariston Service is called out to resolve a non-product related fault.
Your statutory rights are not affected.
CUSTOMER CARE
The MTS Group, as a leading manufacturer of domestic and commercial water heating appliances is committed to providing
high quality products and a high quality after sales service.
Advice on installation or servicing can also be obtained by contacting the Ariston Technical and Customer Service
Departments on:
TECHNICAL DEPARTMENT CUSTOMER SERVICE DEPARTMENT
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
GUARANTEE
The manufacturer’s guarantee is for 2 years from the date of purchase. The guarantee is invalidated if the appliance is not
installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us
in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler
without delay.
CAUTION
In the United Kingdom, 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.
In the Republic of Ireland, the installation and initial start up of the appliance must be carried out by a Competent Person in
accordance with the current edition of I.S.813 “Domestic Gas Installations”, the current Buidling Regulations, reference should
also be made to the current ETCI rules for electrical installation.
All CORGI registered installers carry a CORGI ID card, and have a registration number. Both should be recorded in
the Benchmark Commissioning Checklist (Section 24 - page 61). You can check your installer is CORGI registered
by calling CORGI direct on:- [phone].
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 that a fault exists on the appliance, it must not be used until the fault has been corrected by a competent person.
To The Installer
As part of the commissioning of this appliance it is necessary to complete Section 24 of this manual (page 61) and give this
manual to the Householder. Please ensure that your customer is aware of the importance of keeping this manual safe as a
record of the installation (Section 24, page 61) and the appliance service history (Section 25, page 62).
Please ensure that your customer is aware of the correct operation of the system, boiler and controls.
MTS recommend the use of protective clothing, when installing and working on the appliance i.e. gloves.

3
CUSTOMER CARE
Page
Guarantee ............................................................................................................................................................2
Statutory Requirements .......................................................................................................................................2
Contents ...............................................................................................................................................................3
INTRODUCTION ..................................................................................................................................................4
USER’S INSTRUCTION .......................................................................................................................................5
1CONTROL PANEL...........................................................................................................................................5
2HOW TO USE .................................................................................................................................................6
Switching on and filling ..........................................................................................................................6
Time setting ............................................................................................................................................6
Heating ...................................................................................................................................................6
Burner ON................................................................................................................................................6
Stand by mode ........................................................................................................................................6
Switch OFF .............................................................................................................................................6
Anti-freeze and anti-sieze mode .............................................................................................................7
3MAINTENANCE ..............................................................................................................................................7
4GUARANTEE ..................................................................................................................................................7
5PRACTICAL INFORMATION...........................................................................................................................7
6SETTING THE TIME CLOCKS ........................................................................................................................8
6.1 SETTING THE MECHANICAL CLOCK .....................................................................................................8
6.2 SETTING THE DIGITAL CLOCK ...............................................................................................................9
INSTALLERS’ INSTRUCTIONS.........................................................................................................................11
7DESCRIPTION...............................................................................................................................................11
8DIMENSIONS ................................................................................................................................................12
9HYDRAULIC DATA .......................................................................................................................................13
10 INSTALLATION REQUIREMENTS................................................................................................................14
11 INSTALLING THE BOILER............................................................................................................................18
12 CONNECTING THE FLUE.............................................................................................................................20
12.1 FITTING THE COAXIAL FLUE (Ø 60/100 HORIZONTAL) ...................................................................21
12.2 FITTING THE 5” FLUE (Ø 80 / 125 HORIZONTAL/VERTICAL) ...........................................................21
12.3 FITTING THE COAXIAL FLUE (Ø 60 / 100 VERTICAL) .......................................................................23
12.4 FITTING THE TWIN PIPE FLUE (Ø80/80) ............................................................................................24
13 ELECTRICAL CONNECTIONS .....................................................................................................................27
13.1 FITTING THE MECHANICAL AND DIGITAL TIME CLOCKS ...............................................................29
13.2 CONNECTING ZONE VALVES.............................................................................................................30
14 COMMISSIONING AND TESTING ................................................................................................................33
14.1 INITIAL PREPARATION ........................................................................................................................33
14.2 INITIAL START-UP................................................................................................................................33
14.3 ADJUSTING THE CO2...........................................................................................................................34
14.4 GAS CONVERSION ..............................................................................................................................34
14.5 ADJUSTING THE MAXIMUM HEATING POWER ................................................................................34
14.6 FITTING THE EXTERNAL SENSOR.....................................................................................................34
14.7 EXTERNAL SENSOR SET-UP..............................................................................................................35
14.8 ADJUSTING THE PARALLEL SHIFT....................................................................................................35
14.9 COMPLETION .......................................................................................................................................35
14.10 OPERATIONAL CHECKS .....................................................................................................................36
14.11 INSTRUCTING THE END USER...........................................................................................................36
15 FITTING THE CASING ..................................................................................................................................37
16 SEQUENCE OF OPERATION.......................................................................................................................38
CENTRAL HEATING MODE .................................................................................................................38
17 ADJUSTMENTS AND SETTINGS .................................................................................................................39
Contents

4
INTRODUCTION
The SYSTEM Ais a fully automatic, wall mounted, low water content condensing system boiler. It is a room
sealed, fan assisted, appliance providing central heating. It has electronic ignition and is suitable for all modern
electrical control systems. The boiler has been designed for domestic use on sealed systems only. A circulating
pump, expansion vessel together with a pressure gauge and safety valve are included within the boiler.
The standard horizontal flue kit is suitable for lengths 300 mm minimum to 815 mm maximum (see pages 19 & 20)
and includes an elbow adapter that can be rotated through 360°.The horizontal flue can extend up to 5 metres
(Ø60/100) and 10 metres (Ø80/125) using 1 metre flue extension kits. 45° and 90° flue bends are also available
as accessories, for more information on the fitting of the flue kits and the suitable flue runs, please refer to Section
12 Connecting the Flue (page 19).
SERVICING INSTRUCTIONS
18 REPLACEMENT OF PARTS .........................................................................................................................46
18.1 To Gain General Access........................................................................................................................46
18.1.1 Removing the front panel.......................................................................................................................46
18.1.2 Lowering the control panel.....................................................................................................................46
18.2 Access to the Combustion Chamber .....................................................................................................47
18.2.1 Removing the air/gas assembly.............................................................................................................47
18.2.2 Removing the burner .............................................................................................................................48
18.2.3 Removing the detection electrode .........................................................................................................48
18.2.4 Removing the ignition electrode.............................................................................................................48
18.2.5 Removing the fan...................................................................................................................................49
18.2.6 Removing the gas valve.........................................................................................................................49
18.2.7 Removing the heat exchanger ...............................................................................................................50
18.2.8 Removing the spark generator...............................................................................................................50
18.3 Access to the Water Circuit ...................................................................................................................51
18.3.1 Drain down.............................................................................................................................................51
18.3.2 Removing the Central Heating Return Body..........................................................................................51
18.3.3 Removing the pump...............................................................................................................................52
18.3.4 Removing the pressure relief valve ......................................................................................................52
18.3.5 Removing the domestic expansion vessel.............................................................................................53
18.3.6 Removing the overheat thermostat........................................................................................................53
18.3.7 Removing the temperature sensors (NTC’s) .........................................................................................53
18.3.8 Removing the pressure gauge...............................................................................................................54
18.3.9 Removing the low water pressure switch ..............................................................................................54
18.4 Access to the Control System................................................................................................................54
18.4.1 Removing the PCB’s..............................................................................................................................54
18.4.2 Removing the fuses ...............................................................................................................................55
18.5 Connecting the External Sensor ............................................................................................................55
19 ERROR CODES ....................................................................................................................................56
20 INCORRECT OPERATION ..................................................................................................................57
21 MAINTENANCE INSTRUCTIONS.........................................................................................................58
21.1 General Remarks...................................................................................................................................58
21.2 Cleaning the Primary Heat Exchanger ..................................................................................................58
21.3 Operational Test ....................................................................................................................................58
22 SHORT SPARES LIST ..........................................................................................................................59
23 TECHNICAL DATA ................................................................................................................................60
24 BENCHMARK COMMISSIONING CHECKLIST...................................................................................61
25 SERVICE INTERVAL RECORD ............................................................................................................62
TERMS AND CONDITIONS OF GUARANTEE.....................................................................................64

5
USER’S INSTRUCTIONS
1. Control Panel
30
26 25
34
28
Fig 1 33
31 32
Control panel (Fig.1)
16.- Pressure Guage
25.- Display
26.- On/off push button and power on indicator light
28.- Reset push button and red indicator lockout light
30.- Central Heating control knob and temperature setting
31.- Menu key
32.- Reducing key
33.- Increasing key
34.- Setting key
Connecting bracket
Taps shown in Open position (Fig. 2)
39 : Gas service tap
41 : Central heating flow isolating valve
42 : Central heating return isolating valve
43 & 44:Filling taps
45 :Filling loop
Fig. 2
41
42
43
44
45
39
16

6
Switching on
1. Check that the pressure in the central heating system is above 0.7 bar and below 1.5 bar on the pressure gauge 16 (Fig. 1)
should it be neccessary to re-pressurise the system, ensure the filling loop 45(Fig. 2) is attached, open the filling taps 43&
44 (Fig. 2), the pressure gauge will now start to rise, once the pressure reads 1.0 bar, close the filling taps and disconnect
the filling loop, periodically check the pressure gauge for correct pressures.
2. Check that the gas service tap is opened at the gas meter and main power is on. Green indicator 26 (Fig. 1) lit.
3.Open the gas tap 39(Fig.2).
4. The boiler is now ready to use.
NOTE:If the boiler is left off for a long time, some air in the gas pipe can hinder the first
lighting attempt, (please refer to Section 20 Incorrect Operation, page 56).
2. How to Use
Time setting
You can set the time by using the keys underneath the display.
Press the setting key for 5 seconds. The hour digits on the display will begin to flash. Set the correct time by using the or
keys. To alter the minutes, press the setting key again, the minute digits will begin to flash. Set the correct time by using
the or keys, once the correct time has been set, press the setting key once more to accept the time.
Note: This is not a timer for Central Heating control.
To obtain heating
Turn the Central heating knob (30 Fig.1)between mini and maxi.
During the setting flashes and displays the temperature the knob has been
set to.
The flashing will continue for a while after the setting and the display will then
indicate one of the following :
-the heating temperature when the room thermostat is ON (Calling).
-the time when the room thermostat is OFF (Satisfied). Room thermostat request
pictogram
BURNER ON and output level
Burner operation is indicated by the symbol. The output of the burner is
then indicated by the flame digits above the burner symbol.
Flame digit
Burner ON
Stand by mode
Turn the control knob 30 (Fig. 1) to the OFF position to deactivate the Central
Heating. Leave the ON/OFF button (26 Fig. 1) On (green light).
During the stand by mode the display indicates the time, the anti-sieze and anti-
frost functions will remain active.
Switch OFF
Press the ON/OFF button (26 Fig.1) the green light will go out.
IMPORTANT:WHILE THE BOILER HAS BEEN SWITCHED OFF THE CENTRAL HEATING,ANTI-
FROST AND ANTI-SIEZE OPERATIONS WILL BECOME INACTIVE. THE BOILER IS STILL ALSO
CONNECTED TO THE MAINS ELECTRICAL AND GAS SUPPLIES.
+
+
OPEN CLOSED

7
Anti-freeze and anti-sieze modes
Provided the ON/OFF button is on (green light), the water pressure is adequate and the boiler has not shut down due to an
error, the anti-freeze and ant-sieze operations will remain active.
When the anti-freeze comes on, one of two codes will be displayed with the snowflake pictogram .
The two possible codes are 05 (pump anti-freeze) or 06 (burner anti-freeze).
05 (Pump anti-freeze):
When the boiler senses a temperature of 8°C or lower, the pump will run for 2 minutes, the
boiler will then check if the flow temperature is higher than 8°C. Should the temperature
still be between 3°C and 8°C the above process will be repeated a maximum of 10 times,
after this the burner will light and run until a temperature of 33°C is detected (see 06
Burner anti-freeze below).
06 (Burner anti-freeze):
When the boiler senses a temperature of 3°C or lower, the boiler will fire at minimum power until a temperature of 33°C is
achieved, the pump will run for 2 minutes after the burner is switched off.
Anti-sieze mode
The anti-sieze mode will activate the pump for 1 minute everytime the boiler has been inactive for 23 hours.
Note: The anti-freeze and anti-sieze modes will be automatically overriden as soon as there is a demand for heaing from the
room thermostat or cylinder thermostat.
The anti-freeze functions will only protect the boiler from freezing, to protect the Central Heating system it will be necessary to
leave the boiler powered, the Central Heating knob turned on and the room thermostat set to its anti-frost setting (usually
between 5°C and 10°C).
As with your car, your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service
check. The service history of the appliance will be marked in the Service Interval Record (Section 25, Page 61).
The manufacturer`s guarantee is for 2 years from the date of purchase. The guarantee is voidable if the appliance is not
installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us
in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler with-
out delay.
3. Maintenance
4. Guarantee
Cleaning the casing and control panel
Should it be necessary to clean the casing and control panel, do so only with a damp cloth, do not use any spray polishes or
cleaners.
Precaution to avoid freezing
We recommend that you contact your installer or local service centre for further advice on the actions to be taken to avoid the
system freezing (should the boiler be turned off at the mains isolator)
•CH system
Choose one of the following solution :
-1) Drain the Central Heating system completely
-2) Protect the Central Heating system with anti freeze chemical products and periodically check the concentration
-3) Leave the Heating mode switched on and set the room thermostat to anti-freeze mode (between 5 and 10°C)
-4) Leave your boiler in stand-by mode, the anti-freeze device will switch on the pump and the burner if necessary.
•DHW system
Turn off the main cold water supply and drain the cylinder.
5. Practical information

8
3
6
9
12
Fig. 4
1. General layout
The mechanical clock covers a 24 hour period. Each tappet represents 15 minutes A(Fig. 5). An override switch is located on
the clock B(Fig 5).
2. To set the time
To set the time of day, grasp the outer edge of the dial and turn slowly clockwise until the correct time is lined up with the arrow
C(Fig. 5).
3. To Set the "On" and "Off" times
The clock uses a 24 hour system e.g. 8 = 8.00 am and 18 = 6.00 pm "ON" periods are set by sliding all tappets between the
"ON" time and the "OFF" time to the outer edge of the dial.The tappets remaining at the centre of the dial are the "OFF"
periods.
4. For operation
Set the selector switch Bto the symbol to control the central heating by the clock. Set the selector switch Bto «I»to select
permanent operation or to «0»to turn the central heating off permanently.
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
1616
1717
1818
1919
2020
2121
2222
2323
2424
99
66
1212
I
A
C
B
Fig. 5
6. Setting the Time Clock
6.1 Setting the Mechanical Clock

9
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
Operating the time switch
The steps marked with the symbol “ ” are necessary to carry out a switching program.
Preparing for Operation
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 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=“Monday”..............7 = Sunday
-Release the “ ” key.
6.3 Setting the Digital Clock
6. Setting the Time Clock (continued)

10
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 instruction operates at the same time every day
123456 = Monday – Saturday
12345 = Monday – Friday
67 =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 display. After programming is completed, and you return the time clock to the current time display with the “
”key, the time clock 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.
Manual Override Switch “ ”
With the “ ” you can change the current setting at any time. The switching program already entered is not altered.
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. “18”. If all memory
locations are occupied, the display “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
point “Entering the switching times”.
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.
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 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 switching time is now erased and the current time is
displayed.
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.
6. Setting the Time Clock (continued)