Ariston EURO COMBI 47 116 10 User Manual

A/23 MFFI - A/27 MFFI  
G.C.N. 47-116-10 / 47-116-12  
Installation Instructions  
Type C Boilers  
LEAVE THESE INSTRUCTIONS  
ADJACENT TO THE GAS METER  
Country of destination: GB  
This manual is an integral and essential part of the product. It should be kept  
with the appliance so that it can be consulted by the user and our authorised  
personnel.  
1.  
GENERAL  
INFORMATION  
Please carefully read the instructions and notices about the unit contained in  
this manual, as they provide important information regarding the safe  
installation, use and maintenance of the product.  
For operating instructions please consult the separate User’s Manual.  
User’s  
Manual  
A/23 MFFI  
A/27 MFFI  
Read the instructions and recommendations in these Installation Instructions  
carefully to ensure proper installation, use and maintenance of the appliance.  
1.1  
General Instructions  
Keep this manual in a safe place. You may need it for your own reference while  
our Servicing Centre technicians or your installer may need to consult it in the  
future.  
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.  
No asbestos or other hazardous materials have been used in the fabrication of  
this product.  
Before connecting the appliance, check that the information shown on the data  
plate and the table on pages 4-5 comply with the electric, water and gas mains  
of the property.You will find the data plate on the reverse of the control panel.  
The gas with which this appliance operates is also shown on the label at the  
bottom of the boiler.  
Do not install this appliance in a damp environment or close to equipment  
which spray water or other liquids.  
Do not place objects on the appliance.  
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.  
Always disconnect the appliance either by unplugging it from the mains or  
turning off the mains switch before cleaning the appliance or carrying out  
maintenance.  
In the case of faults or failure, switch off the appliance and turn off the gas  
tap. Do not tamper with the appliance.  
For repairs, call your local Authorised Servicing Centre and request the use of  
original spare parts. For in-guarantee repairs contact MTS (GB) Limited.  
Check the following at least once a year:  
1 - Check the seal of water connections, replacing the gaskets if necessary.  
2 - Check the seal of the gas connections, replacing the gaskets if necessary.  
3 - Check the general condition of the appliance and of the combustion  
3
B023  
chamber visually.  
4 - Visual check of the combustion: clean burners if necessary.  
5 - With reference to point 3, dismantle and clean the combustion chamber if  
necessary.  
6 - With reference to point 4, dismantle and clean the injectors if necessary.  
7 - Visual check of the primary heat exchanger:  
- check for overheating of the exchangers fins;  
- clean the exhaust side of the exchanger and fan if necessary.  
8 - Regulate the gas pressure, ignition pressure, partial flame, maximum  
flame.  
9 - Check proper operation of the heating safety system:  
- maximum safety temperature;  
- maximum safety pressure.  
10 - Check the proper operation of the gas safety system:  
- gas or flame safety device;  
- gas valve safety device.  
11 - Check that the electrical connections have been made in compliance with  
the instructions shown in the installation instructions.  
12 - Check the efficiency of the hot water supply (flow and temperature).  
13 - Check general operation of the appliance.  
14 - Check the exhaust system for the combustion products.  
1.2  
Technical Information  
A/23 MFFI  
A/27 MFFI  
CE Certification  
29.8/12.0  
27.3/10.1  
91.6  
Heat Input  
Heat Output  
max/min kW  
max/min kW  
25.6/11.0  
23.1/9.2  
90.2  
Efficiency of Nominal Heat Input  
Efficiency at 30% of Nominal Heat Input  
Heat Loss to the Casing (³T=50°C)  
Flue Heat Loss with Burner Operating  
Flue Heat Loss with Burner Off  
%
%
%
%
%
88.3  
1.3  
7.1  
0.4  
87.8  
1.2  
8.6  
0.4  
62  
1.4  
3.16/3.86  
0.37/0.45  
2.35/2.32  
Maximum Discharge of Fumes (G20-G25) Kg/h  
Residual Discharge Head mbar  
59  
1.15  
2.72/3.32  
0.32/0.39  
2.02/2.00  
Consumption at Nominal Capacity (G20-G25)m3/h  
Gas Consumption after 10 Minutes*  
(15°C, 1013 mbar) (G30-G31)  
Temp. of exhaust fumes at nominal  
capacity (G20-G25)  
m3  
Kg/h  
128  
6.6  
°C  
%
137  
5.8  
2
CO Content  
2
8.0  
O Content  
%
9.2  
34  
+5  
CO Content  
Minimum Ambient Temperature  
ppm  
°C  
32  
+5  
200  
Head Loss on Water Side (max) (³T=20°C) mbar  
200  
0.25  
82/42  
56/36  
11.2  
2.5  
2.6  
6/0.2  
7
Residual Head of System  
Heating Temperature  
bar  
max/min °C  
max/min °C  
l/min  
gal/min  
l/min  
max/min bar  
l
0.25  
82/42  
56/36  
9.5  
2.1  
2.6  
6/0.2  
7
1
145  
3
Domestic Hot Water Temperature  
D.H.W. Flow Rate ³T=35°C  
D.H.W. Flow Rate ³T=35°C  
D.H.W. Minimum Flow Rate  
Pressure of Domestic Hot Water  
Expansion Vessel Capacity  
Expansion Vessel Pre-load Pressure  
Maximum Water Content in System  
Maximum Heating Pressure  
1
145  
3
bar  
l
bar  
20-25  
30-37  
230 / 50  
190  
Nominal Pressure Natural Gas (G20-G25) mbar  
20-25  
30-37  
230 / 50  
150  
LPG  
(G30-G31) mbar  
Electrical Supply  
Power Consumption  
V/Hz  
W
44  
Protection Grade of Electrical System  
Internal Fuse Rating  
Weight  
IP  
44  
FAST 2 AT  
47  
FAST 2 AT  
47  
Kg.  
47-116-12  
G.C. Number  
47-116-10  
*Calculated at 70% maximum output  
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4
1.3  
Overall View  
A/23 MFFI - A/27 MFFI  
Fig. 1.1  
Legend:  
1. Flue Connector  
14. Drain Valve  
2. Combustion Chamber Hood  
3. Main Heat Exchanger  
4. Combustion Chamber Insulation Panel  
5. Burner  
15. Secondary Heat Exchanger  
16. Safety Valve (3 bar)  
17. Circulation Pump with Automatic Air Release Valve  
18. Gas Valve  
6. Expansion Vessel  
7. Overheat Thermostat  
8. Spark Generator  
19. Detection Electrodes  
20. Ignition Electrodes  
21. Fan  
9. Diverter Valve  
22. Venturi  
10. Main Circuit Temperature Probe  
11. Main Circuit Flow Switch  
12. Diverter Valve Microswitch  
13. Filter Seat  
23. Air Pressure Switch  
B023  
5
The technical information and instructions provided herein below are intended  
for the installer so that the unit may be installed correctly and safely.  
2.  
INSTALLATION  
The installation and initial start up of the boiler must be by a CORGI Approved  
Installer in compliance with the installation standards currently in effect, as well  
as with any and all local health and safety standards i.e. CORGI .  
2.1  
Reference Standards  
This appliance must be installed by a competent installer in  
accordance with the 1984 Gas Safety (installation & use)  
Regulations (as amended)  
The installation of this appliance must be in accordance with the relevant  
requirements of the 1984 Gas Safety (installation & use) Regulations, the Local  
Building Regulations, the current I.E.E. Wiring Regulations, the byelaws of the  
local water authority, and in Scotland, in accordance with the Building  
Standards (Scotland) Regulation and Health and Safety document No. 635  
“Electricity at work regs. 1989”.  
Installation should also comply with the following British Standard Codes of  
Practice:  
Low pressure  
pipes  
BS 6891  
BS 6798  
BS 5449  
1988  
1987  
1990  
Boilers of rated input  
not exceeding 60 kW  
Forced circulation hot  
water system  
Installation of gas hot water  
supplies for domestic purposes  
( 2nd family gases)  
Flues  
BS 5546  
BS 5440-1  
BS 5440-2  
1990  
1990  
1989  
Air supply  
The appliance may be installed in any room or indoor area, although particular  
attention is drawn to the requirements of the current I.E.E. Wiring Regulations,  
and in Scotland, the electrical provisions of the Building Regulations applicable  
in Scotland, with respect to the installation of the combined appliance in a room  
containing a bath or shower.  
2.2  
Siting the Appliance  
Where a room-sealed appliance is installed in a room containing a bath or  
shower the boiler and any electrical switch or appliance control, utilising  
mains electricity should be situated so that it cannot be touched by a  
person using the bath or shower.  
The location must permit adequate space for servicing and air circulation  
around the appliance as indicated in paragraph 2.4.  
The location must permit the provision of an adequate flue and termination.  
For unusual locations special procedures may be necessary.  
BS 6798-1987 gives detailed guidance on this aspect.  
A compartment used to enclose the appliance must be designed specifically for  
this purpose. No specific ventilation requirements are needed for an installation  
within a cupboard  
This appliance is not suitable for outdoor installation.  
The type C appliances (in which the combustion circuit, air vent intake  
and combustion chamber are air-tight with respect to the room in which  
the appliance is installed) can be installed in any type of room.  
There are no limitations with respect to ventilation and the volume of the room  
itself. The boiler must be installed on a solid, permanent wall to prevent access  
to the electrical parts (when live) through the aperture on the back frame.  
B023  
6
2.3  
Overall Dimensions  
(A-B-D-E)  
(C)  
Fig. 2.1  
Legend:  
A = Central Heating Flow (3/4”)  
B = Domestic Hot Water Outlet (1/2”)  
C = Gas Inlet (3/4”)  
D = Domestic Cold Water Inlet (1/2”)  
E = Central Heating Return (3/4”)  
In order to allow for access to the interior of the boiler for maintenance purposes, the  
boiler must be installed in compliance with the minimum clearances indicated in the  
diagram below.  
2.4  
Clearances  
A/23 MFFI - A/27 MFFI  
60  
60  
450  
40 50 60 70 80  
C
C
300  
Fig. 2.2  
B023  
7
Fasten the boiler in place using the template and anchors supplied with the  
unit. It is highly recommended that a spirit level be used to position the boiler so  
that it is perfectly level.  
For additional information, please consult the instructions contained in the  
connection kit and the flue kit.  
2.5  
2.6  
Mounting the Appliance  
Electrical Connection  
For safety purposes, have a competent person carefully check the electrical  
system in the property, as the manufacturer will not be held liable for damage  
caused by the failure to earth the appliance properly or by anomalies in the  
supply of power. Make sure that the residential electrical system is adequate for  
the maximum power absorbed by the unit, which is indicated on the rating plate.  
In addition, check that the section of cabling is appropriate for the power  
absorbed by the boiler.  
The boiler operates with alternating current, as indicated in the technical data  
table (1.2), where the maximum absorbed power is also indicated. Make sure  
that the connections for the neutral and live wires correspond to the indications  
in the diagram. The appliance electrical connections are situated on the reverse  
of the control panel (see the servicing manual for further information)  
Fig. 2.3  
Important!  
In the event that the power supply cord must be changed, replace it with one  
with the same specifications. Make the connections to the terminal board  
located within the control panel, as follows:  
- The yellow-green wire should be connected to the terminal marked with the  
earth symbol; make sure to re-use the ferrule mounted on the other supply  
cord;  
- The blue wire should be connected to the terminal marked “N”;  
- The brown wire should be connected to the terminal marked “L.  
Note: The diagrams for the electrical system are indicated in section 2.11.  
Warning, this appliance must be earthed.  
External wiring to the appliance must be carried out by a qualified technician  
and be in accordance with the current I.E.E. Regulations and applicable local  
regulations. The EuroCombi range of boilers are supplied for connection to a  
230 V~ 50 Hz supply.  
The supply must be fused at 3 A.  
The method of connection to the electricity supply must facilitate complete  
electrical isolation of the appliance, by the use of a fused double pole isolator  
having a contact separation of at least 3 mm in all poles or alternatively, by  
means of a 3 A fused three pin plug and unswitched shuttered socket outlet  
both complying with BS 1363.  
The point of connection to the electricity supply must be readily accessible and  
adjacent to the appliance unless the appliance is installed in a bathroom when  
this must be sited outside the bathroom.  
The local gas region contractor connects the gas meter to the service pipe.  
If the gas supply for the boiler serves other appliances ensure that an adequate  
supply is available both to the boiler and the other appliances when they are in  
use at the same time.  
2.7  
Gas Connection  
Pipe work must be of an adequate size. Pipes of a smaller size than the boiler  
inlet connection should not be used.  
B023  
8
2.9  
Water Connections  
A/23 MFFI - A/27 MFFI  
C
A
B
D
E
I
Fig. 2.4  
Legend  
A = Central Heating Flow  
B = Domestic Hot Water Outlet  
C = Gas Inlet  
D = Domestic Cold Water Inlet  
E = Central Heating Return  
I = Safety Valve  
Central Heating  
Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990,  
the following notes are given for general guidance.  
Pipe Work:  
Copper tubing to BS EN 1057:1996 is recommended for water pipes. Jointing  
should be either with capillary soldered or compression fittings.  
Where possible pipes should have a gradient to ensure air is carried naturally  
to air release points and water flows naturally to drain taps.  
The appliance has a built-in automatic air release valve, however it should be  
ensured as far as possible that the appliance heat exchanger is not a natural  
collecting point for air.  
Except where providing useful heat, pipes should be insulated to prevent heat  
loss and avoid freezing.  
Particular attention should be paid to pipes passing through ventilated spaces  
in roofs and under floors.  
By-pass:  
The appliance includes an automatic by-pass valve, which protects the main  
heat exchanger in case of reduced or interrupted water circulation through  
the heating system, due to the closing of thermostatic valves or cock-type  
valves within the system.  
System Design:  
This boiler is suitable only for sealed systems.  
Drain Cocks:  
These must be located in accessible positions to permit the draining of the  
whole system. The taps must be at least 15mm nominal size and  
manufactured in accordance with BS 2870:1980.  
Safety Valve Discharge:  
The discharge should terminate facing downwards on the exterior of the  
building in a position where discharging (possibly boiling water & steam) will  
not create danger or nuisance, but in an easily visible position, and not cause  
damage to electrical components and wiring.  
The discharge must not be over an entrance or a window or any other type of  
B023  
9
public access.  
Air Release Points:  
These must be fitted at all high points where air naturally collects and must  
be sited to facilitate complete filling of the system.  
The appliance has an integral sealed expansion vessel to accommodate the  
increase of water value when the system is heated.  
It can accept up to 7 l (1.5 gal) of expansion water. If the heating circuit has  
an unusually high water content, calculate the total expansion and add an  
additional sealed expansion vessel with adequate capacity.  
Mains Water Feed - Central Heating:  
There must be no direct connection to the mains water supply even through a  
non-return valve, without the approval of the Local Water Authority.  
Filling:  
A temporary method for initially filling the system and replacing lost water  
during servicing in accordance with Water Supply Byelaw 14 must be  
provided.  
Domestic Water  
The domestic water must be in accordance with the relevant recommendation  
of BS 5546:1990. Copper tubing to BS EN 1057:1996 is recommended for  
water carrying pipe work and must be used for pipe work carrying drinking  
water.  
Residual Head of the Boiler  
Flue System  
2.9 Flue Connections  
The provision for satisfactory flue termination must be made as described  
in BS 5440-1.  
The appliance must be installed so that the flue terminal is exposed to outdoor air.  
The terminal must not discharge into another room or space such as an  
outhouse or lean-to.  
It is important that the position of the terminal allows a free passage of air  
across it at all times.  
The terminal should be located with due regard for the damage or  
discolouration that might occur on buildings in the vicinity.  
In cold or humid weather water vapour may condense on leaving the flue  
terminal.  
The effect of such "steaming" must be considered.  
If the terminal is less than 2 metres above a balcony, above ground or above a  
flat roof to which people have access, then a suitable terminal guard must be  
fitted. When ordering a terminal guard, quote the appliance model number.  
A suitable terminal guard is available from:  
TOWER FLUE COMPONENTS  
Morley Road  
Tonbridge  
Kent TN9 1RA  
The minimum acceptable spacing from the terminal to obstructions and  
ventilation openings are specified in Fig. 2.5.  
B023  
10  
TERMINAL POSITION  
mm  
A - Directly below an open window or other opening  
B - Below gutters, solid pipes or drain pipes  
C - Below eaves  
D - Below balconies or car-port roof  
E - From vertical drain pipes and soil pipes  
F - From internal or external corners  
G - Above ground or below balcony level  
H - From a surface facing a terminal  
I - From a terminal facing a terminal  
J - From an opening in the car port  
300  
75  
200  
200  
75  
300  
300  
600  
1200  
BC  
F
G
F
D
J
HI  
A
E
K
L
( e.g. door, window ) into dwelling  
K - Vertically from a terminal in the same wall  
L - Horizontally from a terminal in the same wall  
1200  
1500  
300  
G
Fig. 2.5  
The boiler is designed to be connected to a coaxial flue discharge system.  
Ø 60/100 mm  
Fig. 2.6  
In addition, it is also possible to use a twin-pipe (split) system by fitting a special  
adaptor to the flue discharge collar and using one of the apertures for the air  
vent intake located on the top part of the combustion chamber (A).  
Fig. 2.7  
Ø 80 mm  
A
A
A
Ø 80 mm  
B023  
11  
This procedure must be done as follows:  
1 - Remove the air vent intake you want to use, in the area indicated in  
Fig. 2.8, by breaking the perforated ring.  
2 - Use a tool to grasp the lid and remove it completely.  
3 - Clean any burrs or sharp edges with a knife or an appropriate tool.  
A
Fig. 2.8  
Fig. 2.9  
In Fig. 2.10 below, several different types of flue systems are shown.  
For additional information regarding the flue accessories, please consult the  
Flue Pipe Accessories manual.  
Fig. 2.10  
B023  
12  
Maximum Extension Diameter of Pipes  
Use of a Restrictor  
on the Discharge Side  
ExhaustType  
Risk of Condensation Forming  
Exhaust/Air  
(mm)  
C12 (xx)  
C32 (xx)  
C42 (xx)  
4 m  
4 m  
4 m  
ø 60 /100  
ø 60 /100  
ø 60 /100  
L* < 0.5 m  
L* < 0.5 m  
L* < 0.5 m  
Coaxial  
System  
23 kW  
27 kW  
C12 (xy)  
C32 (xy)  
C42 (xy)  
C52 (xy)  
54 m  
54 m  
54 m  
17 m  
46 m  
46 m  
46 m  
17 m  
ø 80  
ø 80  
ø 80  
ø 80  
L < 7 m (23 kW) L < 5 m (27 kW)  
L < 7 m (23 kW) L < 5 m (27 kW)  
L < 7 m (23 kW) L < 5 m (27 kW)  
L < 7 m (23 kW) L < 5 m (27 kW)  
L > 4 9 m (23 kW) L > 6.5 m (27 kW)  
L > 4.9 m (23 kW) L > 6.5m (27 kW)  
L > 4.9m (23 kW) L > 6.5m (27 kW)  
L > 4.9m (23 kW) L > 5.3m (27 kW)  
Twin Pipe  
Systems  
(*) L = Length of Piping  
In calculating the lengths of the pipes, the maximum length must also take into  
consideration the values for the exhaust/air intake end terminals, as well as 90°  
elbows for coaxial systems.  
The C52 types must comply with the following requirements:  
1. The discharge/intake vent pipes must have the same diameter of ø 80 mm.  
2. The maximum combined flue length is 17 m. In this case the minimum length  
for the air intake pipe is 1 meter; the maximum length of vertical  
exhaust pipe must be a maximum of 12 m.  
3. If an elbow is inserted into the discharge/ventilation system, the calculation  
of the overall extension must take into consideration the values for each  
curve, as indicated in the table.  
4. The exhaust pipe must extend at least 0.5 m above the ridge of the roof if it is  
located on a side other than that for the air intake (this is not obligatory if  
the exhaust and air intake pipes are located on the same side of the  
building).  
B023  
13  
In order to perform this procedure, remove boiler cover as indicated in section  
3.2. Then proceed as follows:  
2.10 Room Thermostat  
Connection  
1 Remove the screws “A” located on the bottom part of the boiler;  
2 Widen the sides so that the control panel can be rotated.  
3 Open the cover “B” on the left hand side of the compartment.  
4 Insert the wire for the connection of the room thermostat into the wire  
holder “C”, as indicated in photo 3.  
1
2
A
3
4
C
B
5 Remove the grommet “D” shown in photo 5, make a hole in it and pass  
the room thermostat wire through.  
6 Remove the link located on the terminal and connect the wire.  
7 Replace the grommet and the terminal to their original positions, close the  
cover on the grommet compartment and fasten the wire-clamp “C” in place.  
8 If a remote time clock is to be fitted, disconnect the integral time clock plug  
from the P.C.B.  
9 Using a volt-free switching time clock, connect the switching wires from the  
time clock following points 1-7 above.  
10If using a time clock and room thermostat, these must be connected in  
series as per points 1-9 above.  
Note: Only a two-wire type room thermostat can be used.  
5
7
6
D
C
B023  
14  
Legend:  
2.11 Electrical Diagram  
AT = High Voltage P.C.B.  
BT = Low Voltage P.C.B.  
B
C
D
E
F
G
H
I
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Flame Failure L.E.D.  
Insufficient Water Pressure L.E.D.  
Water Temperature Indicator L.E.D.s  
Overheat Thermostat Warning L.E.D.  
System Reset Button  
Selector Knob for Operating Mode  
Domestic Hot Water Temp. Adjustment  
Central Heating Temp. Adjustment  
Wire Connector for Room Thermostat  
Connector for Total Check System  
Anti-cycling Device Adjustment for Heating  
Soft-light Adjustment  
Max Heating Temperature Adjustment  
Time Clock Connection  
On/Off L.E.D.  
On/Off Switch  
Interface Wire for P.C.B.s  
Relay Motorised Valve  
J
K
M
N
O
P
Q
R
S
T
U
V
W
X
Ignitor Relay  
Gas Valve Relay  
Fan Relay  
Circulation Pump Relay  
Aa = Adaptor (British Gas use only)  
Selector TCS2  
Y
=
A01 = Air Pressure Switch  
A02 = Fan  
A03 = Gas Valve  
A04 = Ignitor  
A05 = Motorised Valve  
A06 = Circulation Pump  
A07 = Flame Detector  
A08 = Earth Terminal  
A09 = Flame Detection Circuit  
A10 = Flame Indicator L.E.D.  
A11 = Transformer  
A12 = Filter  
B01 = Over Heat Thermostat  
B02 = Room Thermostat  
B03 = Gas Valve Modulator  
B05 = Heating Sensor  
B06 = Pressure Switch for Heating Circuit  
B07 = Microswitch for Diverter Valve  
Colours  
Gry  
Rd  
Bl  
= Grey  
= Red  
= Blue  
Grn/Yll = Yellow/Green  
Wh  
Brn  
Blk  
= White  
= Brown  
= Black  
Wh/Rd = White/Red  
B023  
15  
A/23 MFFI - A/27 MFFI  
A/23 MFFI - A/27 MFFI  
B023  
16  
2.12 Water Circuit Diagram  
Legend  
1. Air Pressure Switch  
2. Fan  
A/23 MFFI - A/27 MFFI  
3. Main Heat Exchanger  
4. Main Burner  
5. Ignition Electrodes  
Detection Electrode  
6. Gas Valve  
7. Overheat Thermostat  
8. Main Circuit Temperature Probe  
9. Diverter Valve  
10. Main Circuit Flow Switch including  
Safety Pressure Switch for  
Primary Circuit  
11. Automatic By-pass  
12. Microswitch for Diverter Valve  
13. Secondary Heat Exchanger  
14. Domestic Water Inlet Filter  
15. Boiler Drain Valve  
16. Safety Valve  
17. Water Pressure Gauge  
18. Circulation Pump with Automatic  
Air Release Valve  
3
COMMISSIONING  
19. Expansion Vessel  
Preliminary electrical system checks to ensure electrical safety must be carried  
out by a competent person i.e. polarity, earth continuity, resistance to earth and  
short circuit.  
3.1  
Initial Preparation  
Filling the Heating System:  
Remove the panels of the case and lower the control panel (see point 3.2. for  
further information).  
Open the central heating flow and return cocks supplied with the connection  
kit.  
Unscrew the cap on the automatic air release valve one full turn and leave  
open permanently.  
Close all air release valves on the central heating system.  
Gradually open valve(s) at the filling point (filling-loop) connection to the  
central heating system until water is heard to flow, do not open fully.  
Open each air release tap starting with the lower point and close it only when  
clear water, free of air, is visible.  
Purge the air from the pump by unscrewing anticlockwise the pump plug and  
also manually rotate the pump shaft in the direction indicated by the pump  
label to ensure the pump is free.  
Close the pump plug.  
Continue filling the system until at least 1 bar registers on the pressure  
gauge.  
Inspect the system for water soundness and remedy any leaks discovered.  
Filling of the D.H.W. System:  
Close all hot water draw-off taps.  
Open the cold water inlet cock supplied with the connection kit.  
Open slowly each draw-off tap and close it only when clear water, free of  
bubbles, is visible  
Gas Supply:  
Inspect the entire installation including the gas meter, test for soundness and  
purge, all as described in BS 6891:1988.  
Open the gas cock (supplied with the connection kit) to the appliance and  
check the gas connector on the appliance for leaks.  
When the installation and filling are completed turn on the central heating  
B023  
17  
system (sect. 3.4) and run it until the temperature has reached the boiler  
operating temperature. The system must then be immediately flushed through.  
The flushing procedure must be in line with BS 7593:1992 Code of practice for  
treatment of water in domestic hot water central heating systems.  
During this operation, we highly recommend the use of a central heating  
flushing detergent (Fernox Superfloc or equivalent), whose function is to  
dissolve any foreign matter that may be in the system.  
Substances different from these could create serious problems to the  
pump or other components.  
The use of an inhibitor in system such as Fernox MB-1 or equivalent is strongly  
recommended to prevent corrosion (sludge) damaging the boiler and system.  
Failure to carry out this procedure may invalidate the appliance warranty.  
To remove the front panel of the casing, proceed as follows:  
1. Remove the screw “F” located on the top edge of the panel.  
2. Lift and unhook the panel.  
3.2 Removing the  
Front Panel  
F
1
2
3.3 Control Panel  
A/23 MFFI - A/27 MFFI  
40 50 60 70 80  
C
C
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  
O - System Pressure Gauge  
* Warning the flue analysis mode must only be selected by a qualified service engineer.  
18  
B023  
The checks to be run before initial start-up are as follows:  
1. Make sure that:  
3.4  
3.5  
B023  
Initial Start-up  
-the screw on the automatic air valve has been loosened when the  
system is full;  
- If the water pressure in the system is below 1 bar, bring it up to the appro-  
priate level;  
-Check to see whether the gas cock is closed;  
-Make sure that the electrical connection has been made properly and that  
the earth wire is connected to an efficient earthing system;  
- Supply power to the boiler by pressing the On/Off switch <L> - the L.E.D. “I”  
will turn on - turn the selector knob “C” to the <winter> setting. This will start  
the circulation pump. After 7 seconds, the boiler will signal a shut-  
down due to failure ignition. Leave the boiler as it is until all of the air has  
been bled from the lines.  
-Loosen the cap on the head of the pump to eliminate any air pockets;  
-Repeat the procedure for bleeding the radiators of air;  
-Open the taps for a brief period;  
-Check the system pressure and, if it has dropped, open the filling-loop  
again to bring the pressure back up to 1 bar.  
2. Check the exhaust flue for the fumes produced by combustion.  
3. Make sure that all gate valves are open;  
4. Turn on the gas cock and check the seals on the connections, including the  
one for the burner, making sure that the meter does not signal the passage  
of gas. Check the connections with a soap solution and eliminate any leaks.  
5. Press the reset button “A” for the lighting system; the spark will light the  
main burner. If the burner does not light the first time, repeat the procedure.  
6. Check the minimum and maximum pressure values for the gas going to the  
burner; adjust it if needed using the values indicated in the table in  
section 4.  
(See the relative section for burner pressure adjustment within the servicing  
manual).  
The boiler was designed to make it easy to regulate and check the various  
features. To access the areas where the adjustment and control devices are  
located, simply remove the plugs by pressing from the inside, unscrew the  
screws “A” and remove the bottom part of the instrument panel, rotating it  
upward.  
Operational  
Adjustments  
Right hand side service panel also provides access to:  
- the power supply cord connector;  
- the fuses.  
Left hand side:  
- the potentiometer for regulating the ignition delay (anti-cycling) feature, which  
can be set from 0 to 2 minutes (factory set at 1 minute);  
- the potentiometer for regulating the soft-light feature, the setting for which  
can range from the minimum thermal power to the maximum:  
19  
G20  
G25  
5.5 mm c.a.  
4.5 mm c.a.  
G30-31 1.8 mm c.a.  
- the potentiometer for the maximum thermal power for the heating system,  
maximum thermal power setting (factory set at the maximum value, unless  
indicated otherwise on the adhesive sticker located in proximity to the  
potentiometer);  
- The connection for the diagnostic device (TCS-TCS2).  
The boiler is designed to make it easy to analyse the combustion by-products.  
3.6  
Combustion Analysis  
Using the especially designed apertures, readings can be taken on the  
temperature of the combustion by-products and of the combustion air, as well  
2
2
as of the concentrations of O and CO , etc.  
The best maximum-power test conditions for the heating system are when the  
selector “C” is turned to the flue analysis setting.  
The discharge/ventilation of the exhaust fumes can be monitored to check for  
losses in general pressure in the system. This is done to eliminate the cause of  
lighting failure with the main burner not indicated by a shutdown status.  
With a differential manometer connected to the test socket on the combustion  
chamber, the DP value for the air pressure switch can be taken. The measured  
value should not be less than 10 mbar under maximum thermal power  
conditions (with the knob “C” on the flue test setting) in order for the unit to  
function properly and without interruption.  
3.7  
Fume Discharge  
Monitoring  
The boiler is equipped with the following safety systems (see section 3.3 for  
references):  
3.8  
Boiler Safety Systems  
1 - Ignition Failure  
This control signals an ignition failure on the burner 7 seconds after a lighting  
failure. The L.E.D. “B”.will turn on to signal the shutdown status.  
The system can be reset by pressing and releasing the button “A” after  
checking to make sure that the gas valve is open. Repeat this process until the  
burner lights.  
2 - Circulation Failure  
This control signals that the safety pressure switch on the primary circuit has  
not sensed a pressure of at least 1 bar within 40 seconds of the activation of  
the circulation pump, it shuts off the boiler and lights the L.E.D. “D”. The system  
can be reset (after the pressure has been brought up to the proper level) by  
using the On/Off switch “L.  
3 - Overheating  
This control shuts off the boiler in the case where the primary circuit reaches a  
temperature in excess of 110°C. The L.E.D. “G” will come on to signal this shut  
B023  
20  
off status. After the system has been allowed to cool, the system can be reset  
by pressing the button “A”.  
4 - Limescale Build-up  
This is an indirect control (actuated through the regulation of the temperature in  
the primary heat exchanger) on the formation of limescale in the secondary  
heat exchanger. Regardless of the flow rate and the temperature in the circuit  
for the domestic hot water, the temperature is limited to 62°C.  
5 - Safety Shut-off  
At the start of every lighting phase, the P.C.B. performs a series of internal  
controls. If a malfunction occurs, the boiler will shutdown until the problem has  
been resolved.  
Draining the heating system.  
The heating system must be emptied as follows:  
3.9  
Draining the System  
- Turn off the boiler;  
- Open the drain valve for the system and place a container below to catch the  
water that comes out;  
- Empty the system at the lowest points (where present). If you plan on not  
using the heating system for an extended period of time, it is recommended  
that you add antifreeze with an ethylene glycol base to the water in the  
heating lines and radiators if the ambient temperature drops below 0°C during  
the winter.  
This makes repeated draining of the entire system unnecessary.  
Draining the domestic hot water system.  
Whenever there is the danger of the temperature dropping below the freezing  
point, the domestic hot water system must be drained as follows:  
- Turn off the general water valve for the household plumbing system;  
- Turn on all the hot and cold water taps;  
- Empty the remaining water from the lowest points in the system (where  
present).  
4.  
GAS ADJUSTMENTS  
CATEGORY II2H3+  
Methane Gas  
G20  
Liquid Butane Gas Liquid Propane Gas  
G30  
G31  
3
Lower Wobbe Index (15°C;1013mbar)  
Nominal Delivery Pressure  
Minimum Delivery Pressure  
MJ/m h  
mbar  
mbar  
45.67  
20  
17  
80.58  
30  
70.69  
37  
20  
25  
A/23 MFFI  
Main Burner: n. 13 jets (ø)  
Consumption (15°C; 1013mbar)  
Consumption (15°C; 1013mbar)  
Gas Cock Outlet Pressure  
min - max  
mm  
mc/h  
Kg/h  
1.,25  
2.72  
----  
0.72  
----  
2.02  
0.72  
----  
2.02  
mbar  
11.4- 2.0  
27.5 (*) - 5.2  
35.0 (*) - 7.0  
A/27 MFFI  
Main Burner: n. 15 jets (ø)  
Consumption (15°C; 1013mbar)  
Consumption (15°C; 1013mbar)  
Gas Cock Outlet Pressure:  
max - min  
1.25  
3.16  
----  
0.72  
----  
2.35  
0.72  
----  
2.32  
mc/h  
Kg/h  
mbar  
11.6-2.2  
(*) - 4.8  
(*) - 6.0  
(1mbar = 10,197 column of water)  
The outlet pressure of the gas cock is obtained by completely loosening the  
screw on the solenoid. The maximum pressure of the gas to the burner will be  
equal to the nominal delivery pressure minus the head loss within the gas  
valve.  
B023  
21  
The boiler can be converted to use either methane (natural) gas (G20) or  
LPG (G30 - G31) by an Authorised Service Centre.  
The operations that must be performed are the following:  
1. Replace the jets on the main burner (see table in section 4);  
2. Adjust the maximum and minimum thermal capacity values for the boiler  
(see table in section 4);  
4.1  
Changing the Type of  
Gas  
3. Replace the gas rating plate;  
4. Adjust the maximum thermal power setting;  
CATEGORY II2H3+  
Methane Gas  
G20  
Liquid Butane Gas  
G30  
Liquid Propane Gas  
G31  
Recommended Soft-Light Pressure  
(mbar)  
5-5.5  
17 - 18  
18 - 19  
5. Adjust the soft-light feature;  
6. Adjust the ignition delay feature for the heating system (can be set from  
0 to 2 mins.).  
It is recommended that the following checks be made on the boiler at  
least once a year:  
5.  
MAINTENANCE  
1 - Check the seals for the water connections; replacement of any faulty seals.  
2 - Check the gas seals; replacement of any faulty gas seals.  
3 - Visual check of the entire unit.  
4 - Visual check of the combustion process and cleaning of the burners if  
needed.  
5 - If called for by check no. 3, dismantling and cleaning of the combustion  
chamber.  
6 - If called for by check no. 4, dismantling and cleaning of the injectors.  
7 - Visual check of the primary heat exchanger:  
- check for overheating in the blade assembly;  
- clean the exhaust fan if needed.  
8 - Adjustment of the flow rate of the gas: flow rate for lighting, partial load and  
full load.  
9 -Check of the heating safety systems:  
-safety device for maximum temperature;  
-safety device for maximum pressure.  
10 -Check of the gas safety systems:  
-safety device for lack of gas or flame (detection electrode);  
-safety device for gas cock.  
11 -Check of the electrical connection (make sure it complies with the  
instructions in the manual).  
12 -Check of domestic hot water production efficiency (delivery rate and tem-  
perature)  
13 -Check of the general performance of the unit.  
14 -General check of the discharge/ventilation of the combustion by-  
products.  
B023  
22  
6.  
MISCELLANEOUS  
6.1  
Wiring Diagram for  
Two Heating Zones  
BROWN  
BLUE  
5
2
BOILER ELECTRICAL SUPPLY CABLE  
GREY  
9
ORANGE  
Remove internal time clock plug  
from the the P.C.B. then connect  
room stat terminal block on the  
reverse of the boiler control panel  
(see section 2.10) to 9 + 10 on  
the junction box.  
10  
3
GREEN/YELLOW  
V4043H  
VALVE  
TYPICAL  
JUNCTION BOX  
• 1  
• 2  
• 3  
• 4  
• 5  
• 6  
• 7  
• 8  
• 9  
• 10  
1
3
2
4
5
2
T6360B  
ROOM  
THERMOSTAT  
ZONE1  
BROWN  
BLUE  
8
2
9
GREY  
ORANGE  
10  
3
GREEN/YELLOW  
V4043H  
VALVE  
1
3
2
6
8
2
T6360B  
ROOM  
THERMOSTAT  
ZONE 2  
L
N
E
1
2
3
If a room thermostat is not requiedonZone1,insertalink
between 4 + 5 on the junction box.  
If a room thermostat is not requiedonZone2,insertalink
between 6 + 8 on the junction box.  
240V  
MAINS INPUT (3 AMP)  
B023  
23  
6.2  
Wiring Diagram for  
Connection to Ariston  
Unvented Cylinder  
1
3
2
4
5
2
BOILER ELECTRICAL SUPPLY CABLE  
Remove internal time clock plug  
T6360B  
ROOM  
from the the P.C.B. then connect  
TYPICAL  
JUNCTION BOX  
room stat terminal block on the  
reverse of the boiler control panel  
(see section 2.10) to 9 + 10 on  
the junction box.  
THERMOSTAT  
BROWN  
BLUE  
5
2
9
• 1  
GREY
ORANGE  
• 2  
• 3  
• 4  
• 5  
• 6  
• 7  
• 8  
• 9  
• 10  
10  
3
GREEN/YELLOW  
V4043H  
HEATING VALVE  
BROWN  
8
2
BLUE  
GREY  
9
ORANGE
10  
3
GREEN/YELLOW  
V4043H  
HOT WATER VALVE  
L
1
2
3
N
E
240V  
MAINS INPUT (3 AMP)  
Cylinder  
thermostat  
1
8
6
1
Thermal  
C/P  
cut-out  
P
1 C/P  
2
2
Not  
used  
B023  
24  
NOTES  
B023  
25  
NOTES  
B023  
26  
B023  
27  
Manufacturer:  
Merloni TermoSanitari SpA - Italy  
Commercial subsidiary: MTS (GB) LIMITED  
MTS Building  
Hughenden Avenue,  
High Wycombe  
Bucks HP13 5FT  
Telephone: (01494) 755600 -  
39846012  
Fax: (01494) 459775  
Technical Service Hotline: (01494) 539579  
Cod.  

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