Ariston ecoCOMBI 27 MFFI User guide

Country of destination: GB
Installation and
Servicing Instructions
Type C Boilers
G.C.N: 47-116-23
41-116-08
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
SERIES

2
TABLE OF CONTENTS
1. GENERAL INFORMATION
1.1. GENERAL INFORMATION
1.2. OVERALL VIEW
2. INSTALLATION
2.1. REFERENCE STANDARDS
2.2. SITING THE APPLIANCE
2.3. OVERALL DIMENSIONS
2.4. MINIMUM CLEARANCES
2.5. MOUNTING THE APPLIANCE
2.6. ELECTRICAL CONNECTION
2.7. GAS CONNECTION
2.8. WATER CONNECTIONS
2.9. FLUE CONNECTIONS
2.10. ACCESSORY CONNECTION
2.10.1. ROOM THERMOSTAT CONNECTION
2.10.2. REMOTE CONTROL CONNECTION
2.10.3. ACCESSORY CONNECTION TERMINAL BLOCK
2.10.4. CYLINDER TEMPERATURE PROBE CONNECTION
2.10.5. REMOTE CONTROL TERMINAL BLOCK AND
CYLINDER PROBE
2.11. ELECTRICAL DIAGRAM
2.12. WATER CIRCUIT DIAGRAMS
3. COMMISSIONING
3.1. INITIAL PROCEDURES
3.2. REMOVING THE CASING
3.3. CONTROL PANEL
3.4. INITIAL START-UP
3.5. DISPLAY:MESSAGES SHOWN DURING
NORMAL OPERATION
3.6. OPERATING PARAMETERS
3.6.1. REGULATION MENU TABLE
3.6.2. SETTINGS DISPLAY
3.6.3. COMFORT KEY
3.6.4. GAS REGULATION CHECK
3.6.5. IGNITION DELAY
3.6.6. ADJUSTING THE MAXIMUM HEATING POWER
3.6.7. SOFT LIGHT ADJUSTMENT
3.7. CHANGING THE TYPE OF GAS
3.8. BOILER SAFETY SYSTEMS
3.9. COMBUSTION ANALYSIS
3.10. DRAINING
4. ZONEVALVES
5. MAINTENANCE
5.1. GENERAL REMARKS
5.2. CLEANING THE PRIMARY EXCHANGER
5.3. CLEANING THE CONDENSATE TRAP
5.4. OPERATIONAL TES
6. SERVICING INSTRUCTIONS
6.1. REPLACEMENT OF PARTS
6.2. TOGAIN GENERAL ACCESS
6.2.1. REMOVING THE SIDE PANELS
6.3. ACCESS TO THE COMBUSTION CHAMBER
6.3.1. REMOVING THE FAN
6.3.2. REMOVING THE BURNER
6.3.3. REMOVING THE ELECTRODES
6.3.4. REMOVING THE COMBUSTION CHAMBER
INSPECTION PANEL
6.3.5. REMOVING THE HEAT EXCHANGER
6.3.6. REMOVING THE CONDENSATE COLLECTOR
6.3.7. REMOVING THE CONDENSATE TRAP
6.3.8. REMOVING THE INJECTOR
6.4. REMOVING THE GAS VALVE
6.5. ACCESS TO THE WATER CIRCUIT
6.5.1. REMOVING THE D.H.W.
(SECONDARY)EXCHANGER
6.5.2. REMOVING THE SAFETY VALVE
6.5.3. REMOVING THE AUTOMATIC AIR VENT
6.5.4. REMOVING THE PUMP PRESSURE SWITCH
6.5.5. REMOVING THE DIVERTER VALVE ACTUATOR
(MFFI ONLY)
6.5.6. REMOVING THE D.H.W. FLOW SWITCH
(MFFI ONLY)
6.5.7. REMOVING THE PUMP
6.5.8. REMOVING THE PRESSURE GAUGE
6.5.9. REMOVING THE EXPANSION VESSEL
6.5.10. REMOVING THE D.H.W. TEMPERATURE
PROBE (N.T.C. - MFFI ONLY)
6.5.11. REMOVING THE C.H. FLOW TEMPERATURE
PROBE (N.T.C.)
6.5.12. REMOVING THE C.H. RETURN TEMPERATURE
PROBE (N.T.C.)
6.6. ACCESS TO THE CONTROL SYSTEM
6.6.1. CHECKING THE FUSES
6.6.2. REMOVING THE PRINTED CIRCUIT BOARDS
6.6.3. REMOVING THE TIME CLOCK
7. FAULT FINDING
7.1 FAULT FINDING GUIDE (FLOW-CHARTS)
8. SHORT SPARES PARTS LIST
8.1. ecoCOMBI 27 MFFI
8.2. ecoSYSTEM 27 RFFI
9. TECHNICAL INFORMATION

3
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.
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 End User Manual.
1. GENERAL
INFORMATION
1.1. GENERAL INFORMATION Read the instructions and recommendations in these Installation Instructions carefully
to ensure proper installation, use and maintenance of the appliance.
Keep this manual in a safe place. You may need it for your own reference while
Servicing 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 the last page comply with the electric, water and gas supply 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 electrical switches on or off, use the
telephone or any other object which might cause sparks.
Open doors and windows immediately to ventilate the room.
Shut the gas mains tap (on the gas meter) or the valve of the gas cylinder and call
your Gas Supplier immediately.
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 Service Agent and request the use of original spare parts.
For in-guarantee repairs contact MTS (GB) Limite1d.

4
LEGEND:
1. Flue connector
2. Air release valve
3. Pump pressure switch
4. Central Heating flow temperature probe
5. Mixer
6. Ignition and detection electrode
7. Fan
8. Silencer
9. Central Heating return temperature probe
10. Condensate trap (tube)
11. Condensate trap
12. Safety valve (3 bar)
13. Domestic Hot Water temperature probe
14. Automatic by-pass
15. Secondary heat exchanger
16. Gas valve
17. Diverter valve
18. Domestic Hot Water flow switch
19. Drain valve
20. Circulation pump with automatic air release valve
21. Expansion vessel
22. Condensate collector
23. Combustion chamber inspection hatch
24. Main heat exchanger (aluminium)
1.2. OVERALL VIEW
9
8
1
2
5
7
11
10
12
13 14 15 16 17 18 19
20
22
24
21
6
3
4
23
27 MFFI
9
8
1
5
7
11
10
12
16 19
20
21
23
24
6
3
4
22
2
27 RFFI
FIG.1.0

Installation should also comply with the following British Standard Codes of Practice: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.
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.
2.2. SITING THE APPLIANCE
5
The technical information and instructions provided herein below are intended for the
installer so that the unit may be installed correctly and safely.
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 .
This appliance must be installed by a competent installer in accordance with current
Gas Safety Regulations (Installation & Use) 1996.
The installation of this appliance must be in accordance with the relevant requirements of
the current Gas Safety Regulations (Installation & Use) 1996, current Building Regulations,
the current I.E.E. Wiring Regulations, current Water Regulations/ Byelaws, in Scotland in
accordance with the Building Standards (Scotland - Consolidated) Regulations and Health
and Safety document No. 635 “Electricity at work regs. 1989” and in Ireland the local
Building Regulations (IE).
C.O.S.H.H
Materials used in the manufacture of this appliance are non-hazardous and no special
precautions are required when servicing.
2. INSTALLATION
2.1. REFERENCE STANDARDS
Gas installations BS 6891 1988
Boilers of rated input
not exceeding 60 kW BS 6798 1987
Forced circulation hot
water system BS 5449 1990
Installation of gas hot water
supplies for domestic purposes
( 2nd family gases) BS 5546 1990
Flues BS 5440-1 1990
Air supply BS 5440-2 1989
Treatment of water in domestic
hot water central heating systems BS 7593 1992
I.E.E. wiring regulations BS 7671 1992
Specification for expansion
vessels BS 4814 1990
Installation of L.P.G. BS 5482 1994

6
2.3. OVERALL DIMENSIONS
In order to allow for access to the interior of the boiler for maintenance purposes, the boiler
must be installed in compliance with the clearance requirements indicated in the diagram
below.
2.4. MINIMUM CLEARANCES
100
F
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”)
F= Condensate discharge
888
700
400
305
100
132 132
F
27 RFFI
27 MFFI
300
300
450
**
300
27 MFFI 27 RFFI
FIG.2.0
FIG.2.1
FIG.2.2

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. MOUNTING THE
APPLIANCE
2.6. 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
2.7. GAS CONNECTION 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.
Pipe work must be of an adequate size. It should not be less than 22mm to within 1
metre of the boiler.
IMPORTANT!
In the event that the power supply cable 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. This
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.

8
2.8. WATER CONNECTIONS
Legend:
A=Central Heating Flow E = Central Heating Return
B=Domestic Hot Water Outlet H = Condensate discharge
C=Gas Inlet I = Safety valve discharge
D=Domestic Cold Water Inlet J = Drain 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
public access.
CONDENSATE DISCHARGE:
The condensate discharge hose from the boiler must be inserted by at least 50 mm
into a suitable acid resistant pipe - e.g. plastic waste or overflow pipe. The
condensate discharge pipe must have a continuous fall and preferably be installed
and terminated within the building to prevent freezing.
The discharge pipe must be terminated in a suitable position:
VIEW OF THE BOILER CONNECTIONS
AC
BD E
H
I
JJ
FIG.2.4
ACE
H
I
27 MFFI 27 RFFI

9
i) Connecting in to an internal soil stack (at least 450 mm above the invert of the
stack). A trap giving a water seal of at least 75 mm must be incorporated into
the pipe run , there also must be an air break upstream of the trap.
ii) Connecting into the waste system of the building such as a washing machine or
sink. The connection must be upstream of the washing machine/sink (If the
connection is down stream of the waste trap then an additional trap giving a
minimum water seal of 75 mm and an air break must be incorporated in the
pipe run, as above.
iii) Terminating into a gully, below the grid level but above the water level.
iv)Into a soakway.
NOTE:If any condensate pipe work is to be installed externally, then it should be
kept to a minimum and be insulated with a waterproof insulation and have a
continuous fall.
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 and initial filling (in accordance with Water Supply Byelaw 14), is provided
as an integral part of the connection kit (see FIG.2.5). The flexible hose must be
removed once the system has been filled. The D.H.W. inlet valve on the connection
kit has two positions, one for winter and one for the summer.
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.
UNDER FLOOR HEATING SYSTEMS:
In the event of an under floor heating system, fit a safety thermostat on the boiler flow
(see paragraph 2.10). This thermostat should be positioned at a safe distance from
the boiler to ensure the correct operation of the same. If the thermostat is positioned
too close to the boiler, the water remaining in the boiler after a domestic hot water
draw will flow in the system and may cause the thermostat contact to open without
there being any real danger of the system being damaged, this would lead to a boiler
shutdown both in D.H.W. mode and C.H. mode, and the error code “E08” would be
displayed;boiler operation resumes automatically when the thermostat contact closes
on cooling.
Should the thermostat fail to be installed as recommended, the under floor heating
system can be protected by installing a thermostatic valve upstream from the
thermostat in order to prevent the flow of excessively hot water towards the system.
100
100
0 200
200
300
300
400
400
500
500
600
600
700 800 900 1000 1100 1200 1300 (l/h)
mbar
RESIDUAL HEAD OF THE BOILER

10
In FIG.2.7 below, several different types of flue systems are shown.
For additional information regarding the flue accessories, please consult the Flue Pipe
Accessories manual.
Coaxial
Systems
Twin Pipe
Systems
ExhaustType
C13
B33 outlet of fumes in
chimney or exhaust flue
C13, C33, C43
C53, C83
B23
Maximum Extension
Exhaust/Air
(m)
4
4
42 (S1=S2)
76 (S1+S2)
75 (S2)
Diameter
of Pipes
(mm)
Ø 60/100
Ø 60/100
Ø 80/80
Ø 80/80
Ø 80
TERMINAL POSITION mm
A - Directly below an open window or other opening 300
B - Below gutters, solid pipes or drain pipes 75
C - Below eaves 200
D - Below balconies or car-port roof 200
E - From vertical drain pipes and soil pipes 75
F - From internal or external corners 300
G - Above ground or below balcony level 300
H - From a surface facing a terminal 600
I - From a terminal facing a terminal 1200
J - From an opening in the car port
(e.g. door, window) into dwelling 1200
K - Vertically from a terminal in the same wall 1500
L - Horizontally from a terminal in the same wall 300
M - Horizontally from an opening window 300
N - Fixed by vertical flue terminal
A
BC
D
E
F
G
J
K
HI
L
GF
M
N
N
FIG.2.6
2.9. FLUE CONNECTIONS FLUE SYSTEM
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
KentTN9 1RA
The minimum acceptable spacing from the terminal to obstructions and ventilation
openings are specified in Fig. 2.6

11
2.10. ACCESSORY
CONNECTION IMPORTANT!!
Before carrying out any repairs to the appliance always ensure that the
external power supply has been isolated.The boiler will remain live even when
the ON/OFF knob is in the“O”(off) position.
SE SP CR TA US
M1
In order to gain access to the external control connections, it is first necessary to
lower the control panel (as shown in Section 3.2) then proceed as follows:
1. Remove the service cover on the control panel (FIG 2.8).
2. Pierce the grommett ‘M1’ (FIG.2.9) and pass any cables for the external controls
through before connecting to the terninals.
3. Connect any external controls to their respective connections as shown in (FIG.2.10).
SE - EXTERNAL SENSOR
SP - UNDERFLOOR HEATING SAFETY THERMOSTAT
CR - REMOTE CONTROL
TA - ROOM THERMOSTAT
US - SECONDARY OUTLET ~230V÷50H Z (Secondary Pump, L.P.G. Valve etc.)
IMPORTANT!!
Only remove the links from SP and TA if they are to be connected to external
controls.
FIG.2.7
FIG.2.8
FIG.2.9
FIG.2.10

12
2.11. ELECTRICAL DIAGRAM The P.C.B. is fitted with 2 fuses, on the live and the neutral.
The fuse holder contains:
- 5 x 20mm “3.15A Slow” glass fuses
789
10111213141516
LN
SE SP CR TA
VG CI
OP
P
r
o
g
.
h
m
Day
789
10111213141516
FS
FI MV
NTC1
NTC2 NTC3
A
B
C
D
E
F
GH
II
I
I
J
K
KL
M
N
O
R
SS
T
P
QQ
O
LEGEND:
A:JUMPER
When needed, the P.C.B. allows the different options to
be selected by means of a wire link.
The boiler has the following basic arrangement:
1 OPEN
2 CLOSED (jumper)
3 OPEN
4 OPEN
5 OPEN
6 CLOSED
7 CLOSED(MFFI); OPEN (SYSTEM)
8 OPEN (MFFI); OPEN (SYSTEM)

13
This is the factory configuration. It is recommended that this set-up not be changed,
unless under the following particular circumstances:
JUMPER 3: if the contact is closed, the Secondary Output (flying clamp connected
to connection C7; positions 1-9) controls a LPG valve (optional).
JUMPER 4: if the contact is closed, the continuous operation of the pump is
selected. If the contact remains open, it has no effect and there is no
change in the operation of the boiler.
JUMPER 5: if the contact is closed, the signal transmitted by the connection of the
secondary output clasp (connected to C7; positions 1-9) relates to a
secondary pump (optional). If the contact remains open, the output
signal controls a zone valve (optional).
JUMPER 6: not used
To configure the P.C.B. for the various boiler combinations, use JUMPERS 7 and 8 as
illustrated in the table below:
NOTE:it is essential that the operations involving setting of the jumpers be carried out
only with the device turned off.
C:Anti-cycling device (RA)
D:Maximum heating output regulation (PR)
E:Soft-light regulation (RLA)
F:ON/OFF - Operating mode selector knob
G:Central Heating temperature adjustment
H:Domestic Hot Water temperature adjustment
I:Relay
J:Transformer (PRI: 230V-50Hz; SEK: 10V-0.8VA; SEK:10V-3.5VA;
SEK:10V-3.5VA)
K:Fuses (2 x 3.15 A SLOW)
L:Earth
M:Spark generator
N:Flame detection jumper (under no circumstances should this jumper be
moved from the 1-2 position)
O:Connection to the main P.C.B.
P:Comfort light
Q:Programming keys
R:Comfort key
S:Alpha-numeric display
T:Set and reset key
FS:Domestic Hot Water flow switch
PM:Pump pressure switch
NTC1:Central Heating flow temperature probe
NTC2:Central Heating return temperature probe
NTC3:Domestic Hot Water temperature probe (mod. 27 MFFI)
OP:Timer
VG:Gas valve
M:Diverter valve
CI:Circulation pump with automatic air release valve
MV:Fan
SE:External sensor (Optional)
SP:Under Floor Heating Connection (Optional)
CR:Remote Control (Optional)
TA:Room Thermostat (Optional)
US:Secondary outlet (Optional)
Jumper 7 Jumper 8 CONFIGURATION
contact open contact open RFFI + connection
to an indirect cylinder
contact closed contact open MFFI
contact open contact closed not used
contact closed contact closed not used

14
C1 = FAN
1: “Hall” sensor power supply 12V (red)
2: “Hall” sensor neutral (blue)
3: Not used
4: Start of coil (black)
5: “Hall” sensor input (white)
6: End of coil (brown)
C2 = POWER SUPPLY
1: Earth (yellow/green)
2: Earth (yellow/green)
3: Not connected
4: Neutral (blue)
5: Not connected
6: Live (brown)
C3 = CONNECTIONTO ROOMSTAT
1: Input - 1
2: Input - 2
C4 =TIMER (Factory fitted for MFFI - Oprtional extra for RFFI)
1: 3 V output
2: Timer ground
3: Timer output
4: Not connected
C5 = REMOTE CONTROL (Bus+/Bus-)
1: Input/output-1
2: Input/output-2
C6 = SENSOR CONNECTOR
1: Domestic Hot Water flow switch (grey)
2: Pump pressure switch (grey)
3: Under floor heating thermostat (grey)
4: Heating flow sensor (grey)
5: Central Heating return sensor (grey)
6: Domestic Hot Water sensor (grey)
7: Not used: jumper
8: Outdoor sensor (grey)
9: Domestic Hot Water flow switch (grey)
10: Pump pressure switch (grey)
11: Under floor heating thermostat (grey)
12: Flow sensor (grey)
13: Central Heating sensor (grey)
14: Domestic Hot Water sensor (grey)
15: Not used: under floor heating
16: Outdoor sensor (grey)
C7 = EQUIPMENT CONNECTIONS
1: Secondary output (optional)
2: Gas valve (white)
3: 3-way valve neutral (white)
4: Pump (white)
5: Ionisation (black)
6: Not connected
7: Earth
8: Pump earth (yellow/green)
9: Secondary output (optional)
10: Gas valve (brown)
11: 3-way valve (Domestic Hot Water) (brown)
12: 3-way valve (Central Heating) (brown)
13: Pump (brown)
14: Not connected
15: Earth
16: Gas valve earth (yellow/green)

15
2.12. WATER CIRCUIT DIAGRAMS
ABCD
E
1
4
5
6
7
8
9
11
10
12
13 14
15
16
17
18
19
21
23
24
22
2
3
20
LEGEND:
1- Heating flow temperature probe
2- Air release valve
3- Pump pressure switch
4- Ignition/detection electrode
5- Injector
6- Fan
7- Silencer
8- Condensate discharge tube
9- Gas valve
10 - Pressure gauge
11 - Safety valve
12 - Secondary heat exchanger
13 - Domestic hot water temperature probe
14 - Drain valve
15 - Domestic hot water flow switch
16 - Motorised valve
17 - Automatic By-pass
18 - Circulation pump with automatic air release valve
19 - Condensate trap inspection cap
20 - Condensate trap
21 - Heating return temperature probe
22 - Expansion vessel
23 - Main Heat exchanger
24 - Burner
27 MFFI

16
A
B
D
C
E
1
3
4
5
6
7
8
9
11
10
17
18
19
21
23
24
22
2
16
20
12
13
14
15
Legend:
1- Heating flow temperature probe
2- Air release valve
3- Ignition/detection electrode
4- Injector
5- Fan
6- Silencer
7- Condensate discharge tube
8- Gas valve
9- Pressure gauge
10 - Pump pressure switch
11 - Safety valve (3 bar)
12 - D.H.W. priority valve (Optional extra)
13 - Non-return valve (integral to Jig Kit)
14 - Filling loop (integral to Jig Kit)
15 - Indirect cylinder expansion vessel
16 - Expansion relief valve
17 - Drain valve
18 - Automatic by-pass
19 - Circulation pump with automatic air release valve
20 - Condensate trap
21 - Heating return temperature probe
22 - Expansion vessel
23 - Main Heat exchanger
24 - Burner
27 RFFI

17
3. COMMISSIONING
3.1. INITIAL PREPARATION 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.
FILLING THE HEATING SYSTEM:
Remove the panels of the case and lower the control panel (see section 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 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 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 the 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.
3.2. REMOVING THE CASING To remove the front casing panel,
follow these steps:
1. Remove the screws “A” and
lower the control panel;
2. Remove the screws “B”;
3. Lift and unhook the case panel.
1
ABB
A
2
3

18
3.3. CONTROL PANEL
P
r
o
g
.
h
m
Day
ABC D E
F
G
H
IJK
27 MFFI
27 RFFI
A. Selector Knob for ON/OFF-Summer-Winter
B. Domestic Hot WaterTemperature Adjustment Knob
C. Central Heating Temperature Adjustment Knob
D. Time Clock (Optional for ecoSYSTEM)
E. Heating System Pressure Gauge
F. Programming “+” key
G. Programming “-” key
H. Reset Button
I. Multifunction Display
J. “COMFORT” Function L.E.D./Heating Only (ecoSYSTEM)
K. “COMFORT” Function Push-Button/Heating Only (ecoSYSTEM)/Test Mode (*)
(*) See Section 3.7.5 FlueTest Mode
P
r
o
g
.
h
m
Day
AC DE
F
G
H
IJK

19
3.4. INITIAL START-UP 1. Make sure that:
-the cap of the automatic air release valve is loosened;
-the system pressure is at least 1 bar on the pressure gauge;
-the gas cock is closed;
-the electrical connection has been carried out in the correct manner.
To allow the air to escape from the system, proceed as follows:
-turn on the On/off knob “A” to the “winter” position. The boiler pump will start up and
three consecutive attempts will be made to ignite the burner. After the third attempt, the
electronic system will shutdown the boiler, because the supply of gas has been cut off.
The message “A01”will appear on the display;
-let the pump operate until all the air has escaped from the system;
-repeat the procedure for bleeding the radiators of air;
-draw hot water for a short while;
-check the system pressure and, if it has gone down, fill it with water until it returns to 1
bar.
2. Check the flue system for products of combustion.
3. Fill the boiler condensate trap with water.
N.B. In the event of a prolonged period of system shutdown, the condensate trap
should be filled before any renewed use. A shortage of water in the trap is
dangerous because it could possibly lead to a leakage of fumes into the air.
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 “H” for the lighting system; the spark will light the main burner. If
the burner does not light the first time, repeat the procedure.
The boiler is configured in the factory for the gas type in question. To check the
air/gas ratio, please refer to section 3.6.4.
FIG.3.1

left-hand display
A
rr
d
nn
F
S
t
t/s
right-hand display
da01 a24
00
01
da12 a28
da00 a12
da01 a09
da81 a89
__ --
00
01
Function
Pump overrun
Selects low temperature
systems or std systems
Correction of heat curve
translation
night-time lowering
of the temperature
curve incline
do not use
test mode
do not use
factory setting
set to 03
set to 01
set to20
set to 00
set to 09
see next paragraph
set to 00
3.6. OPERATING PARAMETERS The boiler has been designed to allow easy intervention with regard to the operating
parameters.
3.6.1 REGULATION MENU TABLE Summary of the functions accessed when the RESET button is pushed for 5 seconds.
To return to the normal display, press the “H” reset key repeatedly until all the sequence of
“readout” functions have scrolled through the display and until one of the “display of normal
operations” has appeared (the message that appears will depend on the current operating
mode of the boiler).
Important!!
Parameters d,nand Fare only enabled when the outdoor sensor is
connected.
20
3.5. DISPLAY:MESSAGES
SHOWN DURING
NORMAL OPERATION
LEFT RIGHT
During operation of the boiler, while it is carrying out its normal operations, the left-hand
display shows a series of characters that refer to the operations indicated below:
--
Diagnostics phase (precedes the other operations)
00
No request for heat
CC
Heating, burner off
CC..
Heating, burner on
cc
Pump overrun for heating
dd
Domestic hot water, burner off
dd..
Domestic hot water, burner on
hh
Pump overrun for domestic hot water
bb
Storage cylinder, burner off (SYSTEM version)
bb..
Storage cylinder, burner on (SYSTEM version)
NOTE:the flashing dot on the left-hand display always indicates “burner off”;while the still
dot indicates “burner on”.
The right-hand display (two-digit) shows:
- in CENTRAL HEATING mode: temperature of the Central Heating system flow;
- in DOMESTIC HOT WATER mode:temperature of the Domestic Hot Water (MFFI only).
FIG.3.2