Ariston Type C User guide

Country of destination: GB/IE
Installation and
Servicing
Instructions
Type C Boilers
G.C.N: 47-116-34
G.C.N: 47-116-35
G.C.N: 47-116-09
G.C.N: 47-116-10
LEAVE THESE
INSTRUCTIONS WITH THE
END-USER
SERIES

2
TABLE OF CONTENTS
1. GENERAL INFORMATION
1.1. GENERAL INFORMATION
1.2. TECHNICAL INFORMATION
1.3. 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
2.11. ELECTRICAL DIAGRAM
2.12. WATER CIRCUIT DIAGRAM
3. COMMISSIONING
3.1. INITIAL PREPARATION
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. GAS REGULATION CHECK
3.6.4. IGNITION DELAY ADJUSTMENT
3.6.5. ADJUSTING THE MAXIMUM HEATING POWER
3.6.6. SOFT LIGHT ADJUSTMENT
3.7. CHANGING THE TYPE OF GAS
3.8. BOILER SAFETY SYSTEMS
3.9. COMBUSTION ANALYSIS
3.10. COMPLETION
3.11. DRAINING
4. ZONE VALVES
5. MAINTENANCE
5.1. GENERAL REMARKS
5.2. CLEANING THE PRIMARY EXCHANGER
5.3. CLEANING THE CONDENSATE TRAP
5.4. OPERATIONAL TEST
6. SERVICING INSTRUCTIONS
6.1. REPLACEMENT OF PARTS
6.2. TOGAIN GENERAL ACCESS
6.3. ACCESS TO THE COMBUSTION CHAMBER
6.3.1. REMOVING THE FAN
6.3.2. REMOVING THE AIR PRESSURE SWITCH
6.3.3. REMOVING THE BURNER
6.3.4. REMOVING THE ELECTRODES
6.3.5. REMOVING THE HEATEXCHANGER
6.3.6. REMOVING THE CONDENSATE TRAP (TUBE)
6.3.7. REMOVING THE CONDENSATE TRAP
6.4. ACCESS TO THE GAS VALVE
6.4.1. REMOVING THE GAS VALVE
6.4.2. REMOVING THE SPARK GENERATOR
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 DIVERTER VALVE ACTUATOR
6.5.5. REMOVING THE DHW FLOW SWITCH
(MFFI ONLY)
6.5.6. REMOVING THE PUMP
6.5.7. REMOVING THE PRESSURE GAUGE
6.5.8. REMOVING THE EXPANSION VESSEL
6.5.9. REMOVING THE D.H.W. TEMPERATURE
PROBE (N.T.C. - MFFI ONL
Y)
6.5.10. REMOVING THE C.H. FLOW TEMPERATURE
PROBE (N.T.C.)
6.5.11. 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. ACO 27 MFFI

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 Users
Manual.
1. GENERAL INFORMATION
Read the instructions and recommendations in these Installation
and Servicing 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 in section 7 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 or off 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 (at or adjacent to 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 Agent and
request the use of original spare parts. For in-guarantee repairs
contact MTS (GB) Limited.
1.1. GENERAL INFORMATION

4
Name
CE Certification
Flue Type
Heat Input max/min (Central Heating) kW
Heat Input max (Domestic Hot Water) kW
Heat Output max/min kW
Efficiency of Nominal Heat Input (60/80°C) %
Efficiency of Nominal Heat Input (30/50°C) %
Efficiency at 30% of Nominal Heat Input (47°C) %
Efficiency at 30% of Nominal Heat Input (30°C) %
Efficiency at Minum Input %
Efficiency (Dir. 92/42/EEC)**
SEDBUK Rating Band
Heat Loss to the Casing (∆T=50°C) %
Flue Heat Loss with Burner Operating %
Flue Heat Loss with Burner Off %
General Info
Energy Performance
Max Discharge of Products of Combustion (G20) Kg/h
Residual Discharge Head mbar
Temp. of exhaust fumes at nominal capacity °C
CO2Content %
O2Content %
CO Content ppm
Nox Class
Emissions
Head Loss on Water Side (max) (T=20°C) mbar
Residual Head of System bar
Expansion Vessel Pre-load Pressure bar
Maximum Heating Pressure bar
Expansion Vessel Capacity l
Maximum Water Content of System l
Heating Temperature max/min (High temperature) °C
Heating Temperature max/min (Low Temperature) °C
Central Heating
Domestic Hot Water Temperature (approx) max/min °C
Specific Flow Rate (10 minutes/DT 30°C) l/min
D.H.W. Flow Rate ∆T=25°C l/min
D.H.W.Flow Rate ∆T=35°C l/min
D.H.W. Minimum Flow Rate l/min
Pressure of Domestic Hot Water max/min bar
Domestic HotWater
Nominal Pressure Natural Gas (G20) mbar
Consumption at Nominal Capacity(G20) m3/h
Gas Consumption after 10 Minutes* m3
Gas
Electrical Supply V/Hz
Power Consumption W
Minimum Ambient Temperature °C
Protection Grade of Electrical System IP
Internal Fuse Rating
Elettrical Data
Weight Kg
Dimensions (W/D/H) mm
G.C. Number
ACO 27 MFFI
0085BP0229
C13-C33-C43-C53-C83-B23-B33
25,5 / 8,9
27,0
22,5 / 7,7
88,2
88,2
92,9
92,9
86,7
A
0,5
2,6
0,4
35,3
0,61
72
9,1
4,3
109
5
200
0,2
0,7
3
7
130
82 / 42
75 / 20
56 / 36
12,6
15,2
10,8
2,5
6 / 0,2
20
2,43
0,85
1,5
4
1,5
4
230/50
118
+5
24D
40
280/450/750
47-116-34
ACO 27 RFFI SYSTEM
0085BP0229
C13-C33-C43-C53-C83-B23-B33
25,5 / 8,9
-----
22,5 / 7,7
88,2
88,2
92,9
92,9
86,7
A
0,5
2,6
0,4
35,3
0,61
72
9,1
4,3
109
5
200
0,2
0,7
3
7
130
82 / 42
75 / 20
20
2,43
0,85
230/50
118
+5
24D
40
280/450/750
47-116-09
* Calculated at 70% maximum output
** Calculated on Upper calorific value
Max. Condensate produced l/h
PH of condensate W
1.2. TECHNICAL INFORMATION

5
Name
CE Certification
Flue Type
Heat Input max/min (Central Heating) kW
Heat Input max (Domestic Hot Water) kW
Heat Output max/min kW
Efficiency of Nominal Heat Input (60/80°C) %
Efficiency of Nominal Heat Input (30/50°C) %
Efficiency at 30% of Nominal Heat Input (47°C) %
Efficiency at 30% of Nominal Heat Input (30°C) %
Efficiency at Minum Input %
Efficiency (Dir. 92/42/EEC)**
SEDBUK Rating Band
Heat Loss to the Casing (∆T=50°C) %
Flue Heat Loss with Burner Operating %
Flue Heat Loss with Burner Off %
General Info
Energy Performance
Max Discharge of Products of Combustion (G20) Kg/h
Residual Discharge Head mbar
Temp. of exhaust fumes at nominal capacity °C
CO2Content %
O2Content %
CO Content ppm
Nox Class
Emissions
Head Loss on Water Side (max) (T=20°C) mbar
Residual Head of System bar
Expansion Vessel Pre-load Pressure bar
Maximum Heating Pressure bar
Expansion Vessel Capacity l
Maximum Water Content of System l
Heating Temperature max/min (High temperature) °C
Heating Temperature max/min (Low Temperature) °C
Central Heating
Domestic Hot Water Temperature (approx) max/min °C
Specific Flow Rate (10 minutes/DT 30°C) l/min
D.H.W.Flow Rate ∆T=25°C l/min
D.H.W. Flow Rate ∆T=35°C l/min
D.H.W. Minimum Flow Rate l/min
Pressure of Domestic Hot Water max/min bar
Domestic HotWater
Nominal Pressure Natural Gas (G20) mbar
Consumption at Nominal Capacity(G20) m3/h
Gas Consumption after 10 Minutes* m3
Gas
Electrical Supply V/Hz
Power Consumption W
Minimum Ambient Temperature °C
Protection Grade of Electrical System IP
Internal Fuse Rating
Elettrical Data
Weight Kg
Dimensions (W/D/H) mm
G.C. Number
ACO 32 MFFI
0085BP0229
C13-C33-C43-C53-C83-B23-B33
31,6 /10,5
32,0
28 / 9,5
97,3
88,5
91,2
97,1
89,7
A
0,5
2,7
0,4
45,7
1
76,4
8,7
5
71
5
200
0,2
0,7
3
7
130
82 / 42
75 / 20
56 / 36
15,3
18,3
13,1
2,5
6 / 0,2
20
3,01
0,35
1,8
41,8
4
230/50
118
+5
24D
42
280/450/750
47-116-35
ACO 32 RFFI SYSTEM
0085BP0229
C13-C33-C43-C53-C83-B23-B33
31,6 /10,5
-----------
28 / 9,5
97,3
88,5
91,2
97,1
89,7
A
0,5
2,7
0,4
45,7
1
76,4
8,7
5
71
5
200
0,2
0,7
3
7
130
82 / 42
75 / 20
20
3,01
0,35
230/50
118
+5
24D
40
280/450/750
47-116-10
* Calculated at 70% maximum output
** Calculated on Upper calorific value
Max. Condensate produced l/h
PH of condensate W

6
LEGEND:
1. Flue connector
2. Mixer
3. Fan
4. Spark generator
5. Burner
6. Ignition and detection electrode
7. Air release valve
8. Main heat exchanger (aluminium)
9. Central Heating flow temperature probe
10. Automatic by-pass
11. Domestic Hot Water temperature probe
12. Safety valve (3 bar)
13. Secondary heat exchanger
14. Gas valve
15. Condensate discharge
16. Condensate trap inspection cap
17. Drain valve
18. Domestic Hot Water flow switch
19. Circulation pump with automatic air release valve
20. Condensate trap
21. Diverter valve
22. Condensate trap (tube)
23. Central Heating return temperature probe
24. Expansion vessel
25. Air pressure switch
26. Combustion analysis test point
1.2. OVERALL VIEW
9
8
1
3
5
7
10
11
12 13 14 15 16
19
21
24
25
6
4
26
20
17
18
23
2
22
27/32 MFFI
FIG.1.0
9
9
8
8
1
1
3
3
5
5
7
7
10
12 14 15 16
19
24
25
6
6
4
4
26
20
17
18
23
2
2
22
27/32 RFFI SYSTEM

7
The technical information and instructions provided herein below
are intended for the installer / Servicing Technician so that the
unit may be installed and serviced correctly and safely.
In the United Kingdom the installation and initial start up of the
boiler must be by a CORGI Registered Installer in accordance
with the installation standards currently in effect, as well as with
any and all local health and safety standards i.e. CORGI.
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 Building Regulations, reference should
also be made to the current ETCI rules for electrical installation.
This appliance must be installed by a competent installer in
accordance with current Gas Safety (installation & use)
Regulations.
The installation of this appliance must be in accordance with the
relevant requirements of the Local Building Regulations, the
current I.E.E. Wiring Regulations, the bylaws of the local water
authority, in Scotland, in accordance with the Building Standards
(Scotland) Regulation and Health and Safety document No.635
“Electricity at work regulations 1989” and in the Republic of
Ireland with the current edition of I.S. 813, 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.
Installation should also comply with the following British
Standard Codes of Practice:
and in the Republic of Ireland in accordance with the following
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,
2. INSTALLATION
2.1. REFERENCE STANDARDS
BS 7593:1992 Treatment of water in domestic hot water
central heating systems
BS 5546:1990 Installation of hot water supplies for
domestic purposes
BS 5440-1:2000 Flues
BS 5440-2:2000 Air supply
BS 5449:1990 Forced circulation hot water systems
BS 6798:1987 Installation of gas fired hot water boilers
of rated input not exceeding 60kW
BS 6891:1989 Installation of low pressure gas pipe up to
28mm
BS 7671:2001 IEE wiring regulations
BS 4814:1990 Specification for expansion vessels
BS 5482:1994 Installation of L.P.G.
I.S. 813 Domestic Gas Installations
2.2. SITING THE APPLIANCE
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, the location of the boiler in a
room containing a bath or shower should only be considered if
there is no alternative.
Where a room-sealed appliance is installed in a room
containing a bath or shower the appliance 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, specifically in
accordance with current IEE Wiring Regulations.
The location must permit adequate space for servicing and air
circulation around the appliance as indicated in Section 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 the 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.
Secondary ventilation is not required with this boiler. The boiler
must be installed on a solid, non-combustible, permanent wall to
prevent access from the rear.

8
2.3. OVERALL DIMENSIONS
In order to allow 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
93 65
450 143
118
123
750
5
45
50 35
67 67 65 93
acqua
gas
280
225 225
130 130
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
785
280
450
27/32 MFFI
300
300
450
20 20
27/32 MFFI
FIG. 2.0
FIG. 2.1
93
450 143
118
123
750
5
45
50 35
132132 93
acqua
gas
280
225 225
130 130
F
27/32 RFFI SYSTEM
FIG. 2.1
FIG. 2.2

9
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.
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.
85 mm
220 mm
2.5. MOUNTING THE APPLIANCE
2.6. ELECTRICAL CONNECTION
The boiler operates with alternating current, as indicated in the
technical data table (Section 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 Instructions
for further information Section 6).
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 cable;
- The blue wire should be connected to the terminal marked “N”;
- The brown wire should be connected to the terminal marked “L”.
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. Pipes of a smaller size
than the boiler inlet connection should not be used.
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
competent person and be in accordance with the current I.E.E.
Regulations and applicable local regulations.
The appliance is supplied with a fly-lead already connected, this
must be connected to a 240v supply fused at 3A and 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 (see section 2.2).
Should external controls be required, the design of the external
electrical circuits should be undertaken by a competent person,
see Section 2.10 for further information.
300
27/32 RFFI SYSTEM
FIG. 2.2

10
2.8. WATER CONNECTIONS
Legend:
A = Central Heating Flow
B = Domestic Hot Water Outlet
C = Gas Inlet
D = Domestic Cold Water Inlet
E = Central Heating Return
H= Condensate discharge
I = Safety valve discharge
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 have a
continuous fall of 2.5° and 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:
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.
VIEW OF THE BOILER CONNECTIONS
ACB DE
H
I
J
AC E
H
I
J
FIG.2.4
27/32 MFFI
27/32 RFFI SYSTEM

11
ii) Connecting into the waste system of the building such as
a washing machine or sink trap. 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 method for initially filling the heating system is supplied with
the connection kit. The filling loop is connected between the
cold water inlet and the central heating flow connections, and
incorporates a non-return valve. To operate the filling loop, it
is necessary to open both quarter turn handles, once the
required pressure has been achieved, close both handles and
disconnect the hose in accordance with water byelaws. NOTE:
The installer should ensure that there are no leaks as
frequent filling of the heating system can lead to premature
scaling of the main exchanger and failure of hydraulic
components.
0
100
200
300
400
500
0 200 400 600 800 1000 1200
(mbar)
(l/h)
RESIDUAL HEAD OF THE BOILER
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, a scale
reducer should also be used to reduce the risk of scale
forming in the domestic side of the heat exchanger.
UNDER FLOOR HEATING SYSTEMS:
In the event of an under floor heating system, fit a safety
thermostat on the boiler flow (see Section 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 domestic hot water has been
drawn will flow into the central heating 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.
FIG. 2.5
27/32 MFFI
27/32 RFFI SYSTEM

12
WATER TREATMENT
The boiler is equipped with an aluminium alloy main heat
exchanger.
The detailed recommendations for water treatment are given in
BS 7593:1992 (Treatment of water in domestic hot water central
heating systems); the following notes are given for general
guidance:
- If the boiler is installed in an existing system, any
unsuitableadditives must be removed;
- Under no circumstances should the boiler be fired before
thesystem has been thoroughly flushed; the flushing
procedure must be in line with BS7593:1992.
We highly recommend the use of a flushing detergent
appropriate for the metals used in the aluminium alloy circuit.
These include (Fernox Superfloc, BetzDearborn Sentinel
X300 or X400 or Salamander System Cleanser), whose
function is to dissolve any foreign matter that may be in the
system;
In hard water areas or where large quantities of water are in
the system the treatment of the water to prevent premature
scaling of the main heat exchanger is necessary.
The formation of scale strongly compromises the efficiency of
the thermic exchange because small areas of scale cause a
high increase of the temperature of the metallic walls and
therefore add to the thermal stress of the heat exchanger.
Demineralized water is more aggressive so in this situation it
is necessary to treat the water with an appropriate corrosion
inhibitor.
- Any treatment of water by additives in the system for frost
protection or for corrosion inhibition has to be absolutely
suitable for all the metals used in the circuit including the
aluminium alloys.
The use of a corrosion inhibitor in the system such as Fernox
MB-1, BetzDeaborn Sentinel X100 or Copal Salamander
System Inhibitor is recommended to prevent corrosion
(sludge) damaging the boiler and systems;
-If anti-freeze substances are to be used in the system, check
carefully that they are compatible with the aluminium.
In particular, DO NOT USE ordinary ETHYLENE GLYCOL,
since it is corrosive in relation to aluminium and its alloy, as
well being toxic.
MTS suggests the use of suitable anti-freeze products such
as Fernox ALPHI 11, which will prevent rust and incrustation
taking place.
Periodically check the pH of the water/anti-freeze mixture of
the boiler circuit and replace it when the amount measured is
out of the range stipulated by the manufacturer ( 7 < pH < 8).
DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE
- In under-floor systems, the use of plastic pipes without
protection against penetration of oxygen through the walls
can cause corrosion of the system’s metal parts ( metal
piping, boiler, etc), through the formation of oxides and
bacterial agents.
To prevent this problem, it is necessary to use pipes with an
“oxygen-proof barrier”, in accordance with standards DIN
4726/4729. If pipes of this kind are not used, keep the
system separate byinstalling heat exchangers of those
with a specific system water treatment.
IMPORTANT
Failure to carry out the water treatment procedure
may invalidate the appliance warranty

13
Coaxial
Systems
Twin Pipe
Systems
Exhaust Type
C13
C13, C33, C43
C53, C83
Maximum Extension
Exhaust/Air
(m)
4
20 (S1=S2)
1+39 (S1+S2)
Diameter
of Pipes
(mm)
Ø 60/100
Ø 80/80
Ø 80/80
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
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
Kent TN9 1RA
The minimum acceptable spacing from the terminal to obstructions
and ventilation openings are specified in Fig. 2.7.
IMPORTANT!!
BEFORE CONNECTING THE FLUE,ENSURE THAT 1 LITRE OF
WATER HAS BEEN POURED INTO THE EXHAUST CONNECTION TO
FILL THE CONDENSATE TRAP (FIG.2.6). SHOULD THE TRAP BE
EMPTY THERE IS A RISK OF FLUE GASSES ESCAPING INTO THE
ROOM.
FIG. 2.7
FIG. 2.6
27 MFFI

14
FIG. 2.8
In FIG. 2.8 (PAG E 11), 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
Exhaust Type
C13
C13, C33, C43
C53, C83
Maximum Extension
Exhaust/Air
(m)
4
24 (S1=S2)
1+48 (S1+S2)
Diameter
of Pipes
(mm)
Ø 60/100
Ø 80/80
Ø 80/80
32 MFFI

15
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.
In order to gain access to the external control connections, it is
first necessary to remove the casing (as shown in Section 3.2)
then proceed as follows:
1. Remove the cover of the main PCB box (FIG 2.9).
2. Access can now be gained to the following connector (see
Section 2.11):
CN10 - Safety thermostat for underfoor heating
CN 9 - Room Thermostat
CN 11 - Time clock
CN 6 - Interface PCB
CONNECTION OF ROOM THERMOSTAT OR EXTERNAL
TIME CLOCK
a. - Insert the thermostat cable through the cable grommet and
fasten it by means of the cable-clamp provided.
b. - Connect the thermostat wires to the terminal block
CN9 (Fig. 2.12 - Diagram A).
c.- If a remote time clock is to be fitted, disconnect the
integral time clock from the P.C.B. CN11
d. - Using a volt-free switching time clock, connect the
switching wires from the time clock following points 1-4
above (Fig. 2.12 - Diagram B).
e. - If using an external time clock and room thermostat,
these must be connected in series as points 1-7 above
(Fig. 2.12 - Diagram C).
CONNECTION OF INTERFACE PCB (optional)
The Interface PCB allows for the connection of:
REMOTE CONTROL - Clima Manager
External sensor
Secondaty outlet (*)
(*)= The secondary outlet can be used for the connection of the
following accessories:
- Zone valve
- LPG valve
- Secondary Pump
When connecting one of the above accessories it is
necessary to modify the E
Eparameter on the Parameter
Menu (see Section 3.6.1)
IMPORTANT!!
Only remove the links from SP and TA if they are to be
connected to external controls.
FIG. 2.9
TA
SP
CN6
CR SE
US
FIG.2.11
FIG. 2.12
FIG. 2.10

16
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
P
r
o
g
.
h m
Day
78 9
10 1112
1
1
CN7
CN12
CN8
CN11 CN9 CN10
11
FLOOR
ROOM
TIMER
FUSE
FUSE
N
N
LL
1
CN16
CN4
2
1 2 1
12
3 4
2
123456789
1011
12
1
MV
Az
Bl
Mr
Rs
R/N
Mr
Mr
Nr
Nr
Nr
Bn
Bn
Gr
Gr
Gr
Gr
Gr
Gr
Bn
Bn
Bl
Bl
Bl
Bl
Rs
Bn
Mr
Nr
CN1 CN12CN5
78 9
10 1112
FS PA
TA TS
NTC1
NTC2
NTC3
CN8 CN11
1 2 3 4 5 6 7 8 9
10 11 12
1 2 3 4 5 6
CN6
CN9 CN10
CN5
CN1
CN2
CN3
CN6
CI
AC WFS
VG
O
P
C
L
K
E
F
A
B
H
I
CR
SE US
N
D
N
M
FIG. 2.13

17
Legend:
A-ON/OFF button
B-Multifunction display
C-RESET button
D-Green led (indicates burner on)
E-Comfort function yellow LED
F-Red LED (indicates lockout)
G-COMFORT button
H-Programming key +
I-Programming key -
J-Menù button
K-Central Heating temperature adjustment
L-Domestic Hot Water temperature adjustment
M-Eepron
N-Interface PCB (optional)
FS - Domestic hot water flow switch
NTC1 - Central Heating flow temperature probe
NTC2 - Central Heating return temperature probe
NTC3 - Domestic Hot Water temperature probe
(mod. 27/32 MFFI)
- Connection for boiler thermostat
(mod. 27/32 RFFI SYSTEM)
OP - Time clock
VG - Gas valve
M- Diverter valve (mod. 27/32 MFFI)
- Connection for external diverter valve
(mod. 27/32 RFFI SYSTEM)
CI -Circulation pump with automatic air release valve
MV - Fan
AC - Spark generator
PA-Air pressure switch
TA - Room Thermostat (optional)
TS -Underfloor Heating Safety Thermostat (optional)
CR - Remote Control (optional)
SE - External sensor (optional)
US - Secondary outlet (optional)
CN1 = FAN
1: Start of coil (black)
2: End of coil (brown)
3: “Hall” sensor power supply 12V (red)
4: “Hall” sensor input (white)
5: “Hall” sensor neutral (blue)
6: Not used
CN2 = FLAME SENSOR
CN3 = Earth
CN4 = POWER SUPPLY
1: Live (brown)
2: Neutral (blue)
CN5 = EQUIPMENT
CONNECTIONS
1: Gas valve neutral (blue)
2: Gas valve live (brown)
3: Not used
4: Pump (V1) live (red)
5: Pump (V2) live (black)
6: Pump (ON/OFF) live (brown)
7: Pump neutral (blue)
8: 3-way valve (D. H. W.) (brown)
9: 3-way valve (C. H.)(red/black)
10: 3-way valve Neutral (blue)
11: Spark generator Neutral (blue)
12: Spark generator live (black)
CN6 = INTERFACE PCB
(OPTIONAL - see paragraph 2.10)
Accessories:
External sensor
Remote Control CLIMA MANAGER
Secondary outlet (see Section. 2.10)
CN7 = DISPLAY
1: Power 5V
2: Display return
3: Display transmission
4: Earth
CN8 = SENSOR CONNECTOR
1: Central Heating flow sensor (white)
2: Central Heating return sensor (white)
3: Not used
4: DHW flow switch (grey)
5: DHW sensor (grey)
6: Not used
7: Not used
8: DHW flow switch earth (grey)
9: DHW sensor earth (grey)
10: C.H. flow sensor earth (white)
11: C.H. return sensor earth (white)
12: Not used
CN9 = ROOM THERMOSTAT
(OPTIONAL - see paragraph 2.10)
CN10 = UNDERFLOOR HEATING
SAFETY THERMOSTAT
(OPTIONAL - see paragraph 2.10)
CN11 = TIME CLOCK
see paragraph 2.10

18
2.12. WATER CIRCUIT DIAGRAM
AB C DE
2
3
5
6
7
8
9
10
11
12 13
14
15
16
17
18
19
4
120
LEGEND:
1- Fan
2-Burner
3-Ignition/detection electrode
4 - Air release valve
5 - Main heat exchanger
6- Central heating flow temperature probe
7-Condensate Trap
8- Gas valve
9 - Pressure gauge
10 -Safety valve
11 -Secondary heat exchanger
12 - Domestic hot water temperature probe
13 - Drain valve
14 - Domestic hot water flow switch
15 -Motorised valve
16 -Automatic By-pass
17 - Circulation pump with automatic
air release valve
18 -Expansion vessel
19 -Central heating return temperature probe
20 - Air pressure switch
FIG. 2.14
27/32 MFFI

19
C
2
3
5
6
7
8
9
10 17
16
18
19
20
4
121
A
B
D
E
15
11
12
13
14
LEGEND:
1- Fan
2-Burner
3-Ignition/detection electrode
4 - Air release valve
5 - Main heat exchanger
6- Central heating flow temperature probe
7-Condensate Trap
8- Gas valve
9 - Pressure gauge
10 -Safety valve
11 -D.H.W. priority valve (Optional extra)
12 - Non-return valve (integral to Jig Kit)
13 - Filling loop (integral to Jig Kit)
14 - Indirect cylinder expansion vessel
15 - Expansion relief valve
16 -Drain valve
17 -Automatic By-pass
18 - Circulation pump with automatic
air release valve
19 -Expansion vessel
20 -Central heating return temperature probe
21 - Air pressure switch
FIG.2.14
27/32 RFFI SYSTEM

20
3. COMMISSIONING
3.1. INITIAL PREPARATION MTS (GB) Limited support the initiative. Within the
information pack you will find a copy of the Log Book.
It is important that this is completed in the presence of your
customer, they are shown how to use it, and it is signed by them.
Please instruct your customer that they must have their
Log Book with them whenever they contact a service
engineer or us.
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 lowest 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.
Water Treatment
The boiler is equipped with an aluminium alloy main heat
exchanger.
The detailed recommendations for water treatment are given in
BS 7593:1992 (Treatment of water in domestic hot water central
heating systems); the following notes are given for general
guidance:
- If the boiler is installed in an existing system, any
unsuitableadditives must be removed;
- Under no circumstances should the boiler be fired before
thesystem has been thoroughly flushed; the flushing
procedure must be in line with BS7593:1992.
We highly recommend the use of a flushing detergent
appropriate for the metals used in the aluminium alloy circuit.
These include (Fernox Superfloc, BetzDearborn Sentinel
X300 or X400 or Salamander System Cleanser), whose
function is to dissolve any foreign matter that may be in the
system;
In hard water areas or where large quantities of water are in