Ariston ACO 32 RFFI User guide

Country of destination: GB/IE
Installation and
Servicing
Instructions
Type C Boilers
ACO 27 MFFI G.C.N: 47-116-34
ACO 32 MFFI G.C.N: 47-116-35
ACO 27 RFFI G.C.N: 41-116-09
ACO 32 RFFI G.C.N: 41-116-10
LEAVE THESE INSTRUCTIONS
WITH THE END USER
SERIES

2
TABLE OF CONTENTS
1. GENERAL INFORMATION
1.1. GENERAL INFORMATION 3
1.2. TECHNICAL INFORMATION 4
1.3. OVERALL VIEW 6
2. INSTALLATION
2.1. REFERENCE STANDARDS 7
2.2. SITING THE APPLIANCE 7
2.3. OVERALL DIMENSIONS 8
2.4. MINIMUM CLEARANCES 8
2.5. MOUNTING THE APPLIANCE 9
2.6. ELECTRICAL CONNECTION 9
2.7. GAS CONNECTION 9
2.8. WATER CONNECTIONS 10
2.9. FLUE CONNECTIONS 13
2.9.1 FITTING THE COAXIAL FLUE
(Ø 60 / 100 HORIZONTAL) 14
2.9.2 FITTING THE 5” FLUE
(Ø 80 / 125 Horizontal/Vertical) 15
2.9.3 FITTING THE COAXIAL FLUE
(Ø 60 / 100 VERTICAL) 16
2.9.4 FITTING THE TWIN PIPE (Ø80 / 80) 17
2.10. FITTING THE MECHANICAL/DIGITAL
TIME CLOCK 20
2.11. SETTING THE MECHANICAL TIME CLOCK 22
2.11.1. SETTING THE DIGITAL TIME CLOCK 22
2.12. ACCESSORY CONNECTION 24
2.13. ELECTRICAL DIAGRAM 26
2.14. WATER CIRCUIT DIAGRAM 28
3. COMMISSIONING
3.1. INITIAL PREPARATION 30
3.2. REMOVING THE CASING 32
3.3. CONTROL PANEL 33
3.4. INITIAL START-UP 35
3.5. DISPLAY: MESSAGES SHOWN DURING
NORMAL OPERATION 36
3.6. OPERATING PARAMETERS 37
3.6.1. REGULATION MENU TABLE 37
3.6.2. SETTINGS DISPLAY 43
3.6.3. GAS REGULATION CHECK 44
3.6.4. IGNITION DELAY ADJUSTMENT 45
3.6.5. ADJUSTING THE MAXIMUM HEATING
POWER 45
3.6.6. SOFT LIGHT ADJUSTMENT 45
3.7. CHANGING THE TYPE OF GAS 45
3.8. ADJUSTING THE DOMESTIC HOT
WATER FLOW RATE 45
3.9. BALANCING THE CENTRAL
HEATING SYSTEM 45
3.10. BOILER SAFETY SYSTEMS 46
3.11. COMPLETION 47
3.12. DRAINING 47
4. ZONE VALVES 48
5. SEQUENCE OF OPERATION 51
5.1 CENTRAL HEATING MODE 51
5.2 DOMESTIC HOT WATER MODE 51
6. MAINTENANCE 52
6.1. GENERAL REMARKS 52
6.2. CLEANING THE PRIMARY EXCHANGER 52
6.3. CLEANING THE CONDENSATE TRAP 52
6.4. OPERATIONAL TEST 52
7. SERVICING INSTRUCTIONS 53
7.1. REPLACEMENT OF PARTS 53
7.2. TOGAIN GENERAL ACCESS 53
7.3. ACCESS TO THE COMBUSTION
CHAMBER 54
7.3.1. REMOVING THE FAN 54
7.3.2. REMOVING THE AIR PRESSURE SWITCH 55
7.3.3. REMOVING THE BURNER 55
7.3.4. REMOVING THE ELECTRODES 56
7.3.5. REMOVING THE HEAT EXCHANGER 56
7.3.6. REMOVING THE CONDENSATE
TRAP (TUBE)58
7.3.7. REMOVING THE CONDENSATE TRAP 58
7.4. ACCESS TO THE GAS VALVE 59
7.4.1. REMOVING THE GAS VALVE 59
7.4.2. REMOVING THE SPARK GENERATOR 60
7.5. ACCESS TO THE WATER CIRCUIT 60
7.5.1. REMOVING THE D.H.W.
(SECONDARY) EXCHANGER 60
7.5.2. REMOVING THE SAFETY VALVE 61
7.5.3. REMOVING THE AUTOMATIC AIR VENT 61
7.5.4. REMOVING THE DIVERTER VALVE
ACTUATOR 62
7.5.5. REMOVING THE DHW FLOW SWITCH
(MFFI ONLY) 62
7.5.6. REMOVING THE PUMP 62
7.5.7. REMOVING THE PRESSURE GAUGE 63
7.5.8. REMOVING THE EXPANSION VESSEL 64
7.5.9. REMOVING THE D.H.W. TEMPERATURE
PROBE (N.T.C. - MFFI ONLY)64
7.5.10. REMOVING THE C.H. FLOW
TEMPERATURE PROBE (N.T.C.) 65
7.5.11. REMOVING THE C.H. RETURN
TEMPERATURE PROBE (N.T.C.) 65
7.6. ACCESS TO THE CONTROL SYSTEM 66
7.6.1. CHECKING THE FUSES 66
7.6.2. REMOVING THE PRINTED CIRCUIT
BOARDS 66
7.6.3. REMOVING THE TIME CLOCK 67
8. FAULT FINDING 68
8.1 FAULT FINDING GUIDE
(FLOW-CHARTS) 68
9. SHORT SPARES PARTS LIST 72
10. ANNUAL MAINTENANCE CHECKLIST 76
11. BENCHMARK COMMISSIONING
CHECKLIST 78
12. SERVICE INTERVAL RECORD 79
PAGE PAGE

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.
The ACO MFFI range is a combined appliance for the
production of central heating (C.H.) and domestic hot water
(D.H.W.).
The ACO RFFI range is an appliance for the production of
Central Heating (C.H.) and is designed for use with an indirect
cylinder for Domestic Hot Water (D.H.W.)
The ACO MFFI and RFFI range of boilers are domestic gas
boilers and intended for domestic use only.
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.
MTS recommends the use of protective clothing when installing
and working on the appliance i.e. gloves.
Before connecting the appliance, check that the information
shown on the data plate and the table in Section 1.2 (page 4)
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 allowchildren 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.
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 (Domestic Hot Water) kW
Heat Input max/min (Central Heating) kW
Heat Output max (Domestic Hot Water) kW
Heat Output max/min (Central Heating) 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 Minimum Input %
Efficiency (Dir. 92/42/EEC)**
SEDBUK Rating Band / %
Heat Loss to the Casing (DT=50°C) %
Flue Heat Loss with Burner Operating %
General InfoEnergy Performance
Max Discharge of Products of Combustion (G20) Kg/h
Temp. of exhaust fumes at nominal capacity °C
CO2Content %
O2Content %
CO Content ppm
Nox Class
Emissions
Head Loss on Water Side (max) (DT=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 DT=25°C l/min
D.H.W. Flow Rate DT=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
Electrical Data
Weight Kg
Casing Dimensions (D/W/H) mm
G.C. Number
ACO 27 MFFI (COMBI)
0085BP0229
C13-C33-C43-C53-C83-B23-B33
30.0
25.5 / 8.9
27.0
22.5 / 7.7
88.2
91.8
92.9
96.8
86.7
A / 90.4
0.5
2.6
35.3
72
9.1
4.3
109
5 (70 mg/kW/h)
200
0.2
0.7
3
7
130
82 / 46
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
2A Fast Fuse
41
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
91.8
92.9
96.8
86.7
A / 90.5
0.5
2.6
35.3
72
9.1
4.3
109
5 (70 mg/kW/h)
200
0.2
0.7
3
7
130
82 / 46
75 / 20
20
2.43
0.85
230/50
118
+5
24D
2A Fast Fuse
40
280/450/750
41-116-09
* 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 (Domestic Hot Water) kW
Heat Input max/min (Central Heating) kW
Heat Output max (Domestic Hot Water) kW
Heat Output max/min (Central Heating) 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 Minimum Input %
Efficiency (Dir. 92/42/EEC)**
SEDBUK Rating Band / %
Heat Loss to the Casing (DT=50°C) %
Flue Heat Loss with Burner Operating %
General InfoEnergy 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) (DT=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 DT=25°C l/min
D.H.W. Flow Rate DT=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
Electrical Data
Weight Kg
Casing Dimensions (D/W/H) mm
G.C. Number
ACO 32 MFFI (COMBI)
0085BP0229
C13-C33-C43-C53-C83-B23-B33
32.0
31.6 /10.5
32.0
28 / 9.5
88.5
88.7
91.2
97.1
89.7
A / 90.4
1
2.7
45.7
1
76.4
8.7
5
71
5 (70 mg/kW/h)
200
0.2
0.7
3
7
130
82 / 46
75 / 20
56 / 36
15.3
18.3
13.1
2.5
6 / 0.2
20
3.01
0.35
1.8
4
1.8
4
230/50
118
+5
24D
2A Fast Fuse
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
88.5
88.7
91.2
97.1
89.7
A / 90.5
1
2.7
45.7
1
76.4
8.7
5
71
5 (70 mg/kW/h)
200
0.2
0.7
3
7
130
82 / 46
75 / 20
20
3.01
0.35
230/50
118
+5
24D
2A Fast Fuse
41
280/450/750
41-116-10
* 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
1.3. 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 (COMBI)
FIG. 1.0
9
9
88
1
1
3
3
5
5
77
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:
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 6798:2000 Installation of gas fired hot water boilers
of rated input not exceeding 70kW
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 6798-2000 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
LEGEND:
A= Central Heating Flow (3/4”) (22mm Copper Tail)
B= Domestic Hot Water Outlet (1/2”) (15 mm Copper Tail)
C= Gas Inlet (3/4”) ( 22mm Copper Tail)
D= Domestic Cold Water Inlet (1/2”) (15mm Copper Tail)
E= Central Heating Return (3/4”) (22mm Copper Tail)
F= Condensate discharge
SV outlet = 1/2” Female BSP (Not Shown)
785
280
450
27/32 MFFI (COMBI)
27/32 MFFI/RFFI
FIG. 2.0
FIG. 2.2
27/32 RFFI (SYSTEM)
FIG. 2.1
FIG. 2.3

9
After removing the boiler from its packaging, remove the
template from the separate box containing the connection kit.
NOTE: Pay particular attention to any test water that may spill
from the appliance.
Place the template in the position the appliance is to be
mounted and after ensuring it is hanging squarely, use it to mark
the holes for the hanging bracket, connection kit and flue pipe(s)
NB: For further information relating to the flue installation please
refer to Section 2.9 FLUE CONNECTION. (If the appliance is to be
fitted on a wall of combustible material, the wall must be
protected by a sheet of fireproof material).
If the appliance is to be fitted into a timber framed building,
guidance should be sought from the Institute of Gas Engineers
document REF: IGE/UP/7.
2.5.1. Drill the wall and plug using those supplied with the
connections kit, position the hanging bracket and secure with the
wall screws supplied, assemble the connection kit and secure to
the wall. NOTE:It is highly recommended that a spirit level be
used to position the appliance to ensure that it is perfectly level.
2.5.2. Position the appliance on the hanging bracket and
connect the connection kit to the boiler connections. (see also
Sections 2.7 Gas Connections, 2.8 Water Connections & FIG.
2.5).
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 inside
the electrical box (see Section 2.12).
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. 2.4
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 must not be used.
Note: The diagrams for the electrical system are indicated in
Sections 2.12 and 2.13.
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 Sections 2.12 and 4 for further information.

10
0
100
200
300
400
500
0 200 400 600 800 1000 1200
(mbar)
(l/h)
RESIDUAL HEAD OF THE BOILER ∆T20°C
FIG. 2.6
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 6798:2000 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:
A flexible hose is supplied for connection to the condensate
discharge point H(Fig. 2.5). 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.
NOTE:THE FLEXIBLE CONDENSE HOSE SUPPLIED WITH THE
APPLIANCE CAN BE EXTENDED BY PULLING THE TUBE OPENING THE
RIBBED PIPE.
VIEW OF THE BOILER CONNECTIONS
ACB DE
H
I
J
AC E
H
I
J
FIG. 2.5
27/32 MFFI (COMBI)
27/32 RFFI (SYSTEM)