Strebel S-AF Instruction Manual

Strebel Ltd
1f Albany Park Industrial Estate,
Frimley Road, Camberley,
Surrey, GU16 7PB
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.strebel.co.uk
Further information on our complete product range is available from our website.
CAST IRON –CONDENSING –STEEL SHELL –WATER HEATERS –RENEWABLES
FLUES –ACCESSORIES –RADIATORS
STREBEL
S-AF
Floor standing high efficiency boiler
Installation & Maintenance Manual
2015-06-15 v1.0

The appliance must be installed by qualified personnel in conformity with current Technical Standards and
national and/or local legislation.
All safety, installation and maintenance instructions must also be strictly observed, as stated in this manual.
The S - AF appliances comply with the following:
• Gas directive 2009/142/EC
• Efficiency Directive 92/42/EEC
• Low voltage directive 2006/95/EC
• Electromagnetic compatibility directive 2004/108/EC
• Energy Efficiency ✫✫✫✫
• "Condensing" classification
• NOx Class 5 (< 70 mg/kWh)
For the serial number and year of manufacturer, refer to the technical data plate.
CONFORMITY
Company Management
- 2 -
PRESENTATION

INDEX
SAFETY
SAFETY WARNINGS AND REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PROHIBITED ACTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
GENERAL
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
MAIN STRUCTURE COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
HYDRAULIC CIRCUIT - SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SYSTEM PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CONTROL PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
WIRING DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INSTALLATION
PRODUCT DELIVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DIMENSIONS AND WEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
HANDLING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
INSTALLATION ROOM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
NEW INSTALLATIONS OR REPLACEMENTS OF OLDER APPLIANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
WATER TREATMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
HYDRAULIC FITTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
OPERATING PRINCIPLE DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CONNECTION OF OUTSIDE SENSOR (OPTIONAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
GAS CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
FLUE EXHAUST AND EXTRACTION OF COMBUSTION AIR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
CONDENSATE REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SYSTEM FILLING AND DRAINING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MENU NAVIGATION TREES AND PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
- Key to the user menu lines .................................................................... 33
- Technician menu navigation tree ................................................................ 34
- Key to technician menu ....................................................................... 39
INITIAL COMMISSIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
- Preliminary procedures ....................................................................... 42
- Initial commissioning ......................................................................... 42
- User interface settings via technician menu ....................................................... 43
- Checking / modifying factory settings............................................................. 45
- Change of gas type .......................................................................... 46
- Heating unit ignition .......................................................................... 47
MANUAL TEST function .....................................................................47
Errors with safety block......................................................................49
Errors with safety stop ......................................................................49
Operational checks - calibration after gas type changes ............................................50
- Outside sensor and climatic curve ............................................................... 52
- 0..10V input check ........................................................................... 53
- DHW request type ........................................................................... 54
SCHEDULER SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
TEMPORARY SHUTDOWN OR HOLIDAY SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
MAINTENANCE
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
- 3 -
INDEX

•After unpacking the appliance, ensure that all parts are intact and complete as per the supply specifications, and if any
non-conformities are found, contact the Representative that sold the appliance.
•The appliance must be installed by professionally qualified personnel, in conformity with current national and local
standards and the instructions in the manual supplied with the product.
•The appliance must only be used as envisaged in the design. The manufacturer declines all liability for physical injury
or damage to animals or objects caused by errors in installation, adjustments, maintenance or improper use of the
appliance.
•In the event of water leakage, disconnect the appliance from the electric power mains, shut off the water supply and
promptly notify the Technical Services department or other professionally qualified personnel.
•Periodically check that the hydraulic system operating pressure, in cool conditions, is approx. 2 bar. Otherwise contact
the Technical Services department or other professionally qualified personnel.
•In the event of prolonged disuse of the appliance, the following procedure must be observed:
- Set the appliance main switch and the main system switch to "OFF".
- Shut off the fuel and mains water valves.
•This manual is an integral part of the appliance and consequently must ALWAYS accompany the appliance, also in the
event of sale to another Owner or User or transfer to another system. The manual must be kept with care and in the
event of damage or loss, another copy may be requested from the Technical Services department.
•It is recommended to service the appliance at least once a year.
SAFETY WARNINGS AND REGULATIONS
b
•IT IS STRICTLY PROHIBITED to allow children or disabled persons to change settings on the appliance without assistance.
•IT IS STRICTLY PROHIBITED to activate electrical devices or equipment such as switches, telephones, household
appliances etc. if smells of fuel or uncombusted fuel are detected. In this case:
- Open doors and windows to ventilate the room.
- Close the fuel shut-off valve.
- Arrange for prompt intervention of the Technical
Services or other professionally qualified personnel.
•IT IS STRICTLY PROHIBITED to touch the appliance with bare feet or wet parts of the body.
•IT IS STRICTLY PROHIBITED to perform technical interventions or cleaning before disconnecting the appliance from
the electrical power mains and setting the main system switch and main appliance switch to "OFF".
•IT IS STRICTLY PROHIBITED to modify safety devices or control devices without prior authorisation and instructions
from the appliance manufacturer.
•IT IS STRICTLY PROHIBITED to pull, detach, or twist cables coming out of the appliance, even when disconnected
from the electrical power mains.
•IT IS STRICTLY PROHIBITED to seal off or partially obstruct the ventilation outlets of the installation room and the
appliance (if present). The ventilation outlets are essential to ensure efficient combustion.
•IT IS STRICTLY PROHIBITED to obstruct the condensate drain outlet.
•IT IS STRICTLY PROHIBITED to leave containers of flammable substances in the same room as the appliance.
•IT IS STRICTLY PROHIBITED to dispose of packaging into the environment as this constitutes a potential source of
danger. It must therefore be disposed of in accordance with current legislation in the place of use.
PROHIBITED ACTIONS
a
- 4 -
SAFETY

The aluminium heating units in the range S - AF are condensing heat generators, designed to heat rooms, and in
combination with a storage tank, for the production of domestic hot water.
They comprise:
- an aluminium heat exchanger, with low water content and generously sized exchange surface to optimise energy
efficiency and heating output;
- a full pre-mix microflame burner in stainless steel, to guarantee high modulation ratios, combustion stability and low
pollutant emissions (NOx Class = 5);
- a variable speed blower, required for air/gas modulation and mixing;
- a combustion circuit, which can be “type C” (room-sealed) or “type B” (open-flued), with respect to the installation
environment, and on the basis of the flue exhaust configuration on site;
- command-control electronics, which if equipped with outside sensor enables adjustment of the supply temperature on
the basis of the outside temperature. The appliance thus only provides the heat effectively needed by the utility, avoiding
energy waste. The unit is fitted with self-diagnostics with a display of the error codes and operating parameters at the
time of the fault, thereby simplifying tasks for the Technical Services department.
Also, during periods of prolonged disuse or holidays, the appliance remains protected by the Anti-freeze Function, which is
activated automatically when the supply temperature falls to 5°C and shuts off when it returns to 15°C. Obviously the gas
and electrical mains supplies must be active during these periods.
The design phase adopted specific solutions to:
- obtain a constantly optimal air/gas mix;
- minimise dispersions;
- reduce noise levels to a minimum.
The S - AF heating units are designed for connection to 0-10 V DC controls and for operation in cascade, in sets of up to 6
units, and can be equipped with various system accessories, such as the mix bottle or water shut-off valve, and the ISPESL
unit, which all simplify the work of the installer and comply with compulsory italian legal requirements.
DESCRIPTION
S - AF appliances are equipped with the following safety, control and adjustment devices:
- Sensor on the appliance heat exchanger, to ensure thermal cut-out when the temperature reading exceeds the maximum
admissible value. This is reset manually via the DSP keypad.
- Water pressure sensor: this intervenes when the hydraulic circuit pressure falls below 0.8 bar.
- Condensate pressure switch: this intervenes when the flue pressure in the condensate collection tank exceeds 5 mbar.
- Flue safety sensor: this intervenes when the flue temperature is too high.
- Gas pressure switch: this intervenes if the supply gas pressure falls below 14 mbar.
- Hydraulic circuit diagnostics to protect the heating unit against:
 - temperatureoverload,bycheckingthedifferenceintemperaturesonsupplyandreturn(ΔT);
- inadequate water circulation in the heat exchanger, checking the difference in temperatures between the heat
exchanger sensor and supply sensor.
bWARNING
•If a safety devices trips, this means that there is a potentially hazardous appliance malfunction. In this case contact
Technical Services as soon as possible for assistance.
DEVICES
- 5 -
GENERAL
- 5 -

Bongioanni Caldaie S.r.l.
Via Piave, n°14
12011 Borgo San Dalmazzo (CN) Italy
Tel.[phone] Fax.[phone]
Qn
Max
Pn
Pn
PMS
Max (80-60)
Max (50-30)
Qn
Min
Pn
Pn
CL NOx
Min (80-60)
Min (50-30)
0051
bWARNING
•Any tampering, removal or elimination of the technical data plate or other element will prevent secure identification of
the product, creating problems with installation and maintenance operations.
IDENTIFICATION
The appliance is identified by means of:
- the Technical data plate affixed to the casing.
TYPE OF GAS AND
SUPPLY PRESSURE
PIN NUMBER
BOILER MODEL
EFFICIENCY CLASS
COUNTRY OF DESTINATION
SERIAL NUMBER
GAS CATEGORY
WATER CONTENT
MAXIMUM HEATING
OUTPUT
MINIMUM HEATING OUTPUT
ELECTRICAL POWER SUPPLY
MAX. OPERATING
PRESSURE
MINIMUM USEFUL
OUTPUT
TYPE OF
BOILER
BOILER
CODE
BOILER
CLASS
MAXIMUM
USEFUL OUTPUT
ELECTRICAL PROTECTION
RATING
ELECTRICAL POWER
ABSORPTION
MONTH AND YEAR OF
MANUFACTURE
NOxCLASS
- 6 -
GENERAL
- 6 -

MAIN STRUCTURE COMPONENTS
1 Front panel
2 Gas valve
3 Gas pressure switch
4 Syphon pressure switch
5 Water pressure sensor
6 Pressure gauge
7 Return sensor
8 System return manifold
9 Heating unit drain valve
10 Foot
11 Wheel
12 Condensate drain syphon
13 Condensate collection tank
14 Flue exhaust connector
15 Gas intake hose
16 Heat exchanger
17 Inspection and cleaning access panel
18 Automatic purge valve
19 Supply sensor
20 System supply manifold
21 Top panel
22 Burner
23 Blower
24 Ignition electrodes
25 Flame detector electrode
26 Electrical connection terminal board
27 Side panels
28 Combustion air intake
29 Heating unit circuit board enclosure
30 Control panel
1
2
3
24
25
27
12
14
16
17
22
30
4
5
7
6
8
9
10 11
12
13 27
28
28
18
19
20
23
9
26
29
2
23
14
15
16
18 30181920212223
- 7 -
GENERAL
- 7 -

TECHNICAL SPECIFICATIONS
DESCRIPTION S - AF
115 150 200 240 280
Fuel G20 (20 mbar) - G31 (37 mbar)
Country(s) of destination EU
Appliance category II2H3P
Type of appliance B23, B33, C43, C53, C63, C83
Max. nominal heating output (Qn) 113.0 150.0 200.0 235.0 275.0
kW
Min. heating output (Qmin) 21.0 30.0 35.5 42.5 49.5 kW
Nominal heating output (80-60°C) (Pn) 109.7 146.7 196.0 229.8 269.2 kW
Nominal heating output (50-30°C) 116.1 156.2 207.8 243.9 285.5 kW
Minimum heating output (80-60°C) (Pmin) 20.0 29.0 34.7 41.5 48.3 kW
EFFICIENCY
Useful efficiency at Pn (80-60°C) 97.1 97.8 98.0 97.8 97.9
%
Useful efficiency at min. Pn (80-60°C) 95.0 96.5 97.7 97.6 97.5 %
Useful efficiency at Pn (50-30°C) 102.7 104.1 103.9 103.8 103.8 %
Useful efficiency at 30% (return 30°C) 107.6 107.5 107.5 107.5 107.5
%
Max. gas consumption G20 11.96 15.87 21.16 24.87 29.10
m3/h
G31 8.78 11.66 15.54 18.26 21.37 kg/h
Min. gas consumption G20 2.22 3.17 3.76 4.50 5.24
m3/h
G31 1.63 2.33 2.76 3.30 3.85 kg/h
EMISSIONS
Flue temperature (80-60°C) at Pn 65 -70
°C
Flue temperature (80-60°C) at Pn min 60 -65
°C
Flue temperature (50-30°C) at Pn / min. Pn 40 - 45
°C
Mass flue gas rate at Pn (80-60°C) 49.1 64.6 86.1 99.5 110.8
g/s
Mass flue gas rate at Pn min (80-60°C) 9.8 16.1 16.3 19.1 21.5
g/s
Max. condensate production 15 19 25 30 36 l/h
max/min CO2 (G20) (average values) 9.3/9.1 %
max/min CO2 (G31) (average values) 10.6/10.3 %
CO 25 30 35 20 28 ppm
NOx 15 20 18 18 18 ppm
NOx Class 5 -
ELECTRICAL DATA
Electrical power absorption 225 260 320 320 320
W
Power supply voltage 220/240 ~ 50/60
Volt ~ Hz
Protection rating X0D IP
BOILER
Max. heating pressure 6
bar
Max. operating temperature 90 °C
Heating water content 15.3 18.0 22.9 25.6 28.4 l
Pressuredroponwaterside∆Tnom. (20°C) 80 80 90 90 100
mbar
ΔTMaximumsupply/return 35 °C
WaterflowrateΔTnom. (20°C) 4.86 6.45 8.60 10.11 11.83
m3/h
WaterflowrateΔT(10°C) 9.72 12.90 17.20 20.21 23.65 m3/h
FLUE EXHAUST
Flue connector 150 150 200 200 200
Ø
Air connector 100 Ø
Total residual head (drain + intake) 320 233 100 180 85 Pa
BLOWER
RPM Min - Max G20 1665 - 7400 1650 - 6250 1230 - 5600 1320 - 5800 1300 - 5800
rpm
Frequency Min - Max 55.5 - 246.7 55 - 208.3 61.5 - 280 66 - 290 65 - 290
Hz
RPM Min - Max G31 1665 - 7400 1650 - 6250 1230 - 5600 1320 - 5800 1300 - 5800 rpm
Frequency Min - Max 55.5 - 246.7 55 - 208.3 61.5 - 280 66 - 290 65 - 290
Hz
DIMENSIONS and WEIGHTS
Width 640
mm
Depth (including flue) 1115 1115 1335 1335 1335 mm
Height 1200 mm
Weight 180 190 240 257 274 Kg
- 8 -
GENERAL
- 8 -

MI
RI
GAS
MI
RI
GAS
HYDRAULIC CIRCUIT - SENSORS
1 Automatic purge valve
2 Supply sensor
3 Heat exchanger
4 Gas pressure switch
5 Pressure gauge connector
6 Return sensor
7 Water pressure sensor
8
Heating unit drain valve
9 Condensate drain syphon
10 Heat exchanger sensor
11 Safety thermostat
12 Flue exhaust sensor
1
1
2
2
11
10
12
3
4
4
6
7
7
5
8
9
9
- 9 -
GENERAL
- 9 -

SYSTEM PUMP
Select a pump that is compatible with the hydraulic resistance of the heating unit and system.
The graph shows the pressure drop curves of the heating units.
It is recommended to observe the water flow rates in the table and as specified below.
bWARNINGS
•Failure to observe the recommended flow rates could cause appliance malfunctions.
•On initial start-up, check rotation of the pump shafts.
•NEVER run the pump without water.
•The selected pumps must have adequate absorption levels in relation to the fuse installed on the electrical panel (6.3A).
0
Pressure Drops (mbar)
Flow rate (m3/h)
1000
1100
1200
1300
900
800
700
600
500
400
300
200
100
0
246810 12 14 16 18 20
115
150
200
240
280
DESCRIPTION S - AF
115 150 200 240 280
WaterflowrateΔT20 4.72 6.30 8.42 9.88 11.57 m3/h
WaterflowrateΔT15 7.08 9.45 12.63 14.82 17.36 m3/h
- 10 -
GENERAL
- 10 -

Fpc1
Fpc2
Fpcs
Fpbl
CONTROL PANEL
Sbs Block indicator light due to intervention of safety devices
DSP User interface with display
Ip Main switch with indicator light
Fu Main fuse (10A)
Vf Flame screen
TST Heating safety thermostat with manual reset
SbsDSP FuIpVfTST
Fpc1 Primary pump 1 fuse (6.3A)
Fpbl Storage tank pump fuse (6.3A)
Fpc2 Primary pump 2 fuse (6.3A)
Fpcs Cascade pump fuse (6.3A)
- 11 -
GENERAL
- 11 -

DSP
eco
esc
menu
ok
Monday, 24. September 2012
09.37
Key Description offunction Display
HON/STAND-BY
STAND-BY: This shuts down the appliance,
inhibiting the use of DSP keys
ON: This enables start-up of the appliance, enabling
use of DSP keys
date
time
date
OUTSIDE
7oC
69o
0.0
OFF OFF
time
DESCRIPTION OF SYMBOLS ON DISPLAY
Monday, 24. September 2012
OUTSIDE
5
o
C
80
o
0.0
ON ON
09.37
HEATING
D.H.W.
SET DATE
SUPPLY
TEMPERATURE
READING
DOMESTIC
HOT WATER
REQUEST ACTIVE
OUTSIDE SENSOR
TEMPERATURE
READING
OPERATING MODE
INITIAL SCREEN
SET TIME
BOILER
WATER PRESSURE
HEATING
REQUEST ACTIVE
- 12 -
GENERAL
- 12 -

Key Description offunction Display
IOPERATING MODE
SUMMER: DHW production only
WINTER: heating only or heating and DHW
NONE: no heating or DHW Anti-freeze or “Manual
Test” function active
Monday, 24. September 2012
OUTSIDE
7oC
69o
0.0
ON OFF
09.37
Monday, 24. September 2012
OUTSIDE
7
o
C
69
o
0.0
OFF
09.37
ON
Monday, 24. September 2012
OUTSIDE
7
o
C
69
o
0.0
ON ON
09.37
date
OUTSIDE
7oC
69o
0.0
OFF OFF
time
JECO - Manual
This reduces, by the set value, the temperature of
domestic water supply and heating water (energy
saving mode)
Monday, 24. September 2012
OUTSIDE
7oC
69o
0.0
ECO ECO
09.37
eco
EESC
Interrupts the current action and returns to the initial
screen
date
OUTSIDE
7oC
69o
0.0
OFF OFF
time
FMENU
Enables display of the page for menu selection
(USER or TECHNICIAN)
MENU
USER
TECHNICIAN
- 13 -
GENERAL
- 13 -

Key Description offunction Display
GHOLIDAY
This enables entry of the holiday dates (start/end)
and values for the supply of domestic hot water and
heating water during this period
Holiday start
20 / 10
2012
oK to confirm
Holiday end
2012
to confirm
oK
30 / 10
B
D
UP
Enables the user to scroll up through the lines on
screen
DOWN
Enables the user to scroll down through the lines on
screen
Keep pressed to speed up the scrolling action.
oK
User menu
1. HEATING
2. DOMESTIC HOT WATER
3. HOLIDAY
4. MAINTENANCE
5. SETTINGS
6. DIAGNOSTICS
to confirm
oK
User menu
1. HEATING
2. DOMESTIC HOT WATER
3. HOLIDAY
4. MAINTENANCE
5. SETTINGS
6. DIAGNOSTICS
to confirm
COK
Enables:
- access to the selected line of the menu or sub-
menu
- confirmation of a newly modified value
DHW settings
1. DHW setpoint
2. ECO setpoint reduction
3. Scheduler set
oK to confirm
DHW setpoint
60
oK to confirm
ARED (at top)
Enables:
- access to the USER menu
- increases to the value to be modified
Keep pressed to speed up the action.
MENU
USER
TECHNICIAN
a
A
A
DHW setpoint
70
oK to confirm
a
A
A
ARED (intermediate )
Enables:
- access to the TECHNICIAN menu
- decreases to the value to be modified
Keep pressed to speed up the action.
MENU
USER
TECHNICIAN
A
a
A
DHW setpoint
50
oK to confirm
A
a
A
ARED (at bottom)
Enables return to the selected line without saving/
storing the modified data.
DHW setpoint
50
oK to confirm
A
A
a
DHW settings
1. DHW setpoint
2. ECO setpoint reduction
3. Scheduler set
oK to confirm
A
A
a
- 14 -
GENERAL
- 14 -

WIRING DIAGRAM
Transformer
REQUIRED BY INSTALLER
Display
Board
X01 X06
X07
X03
X04
X05
Burner
Syphon
pressure switch
Return sensor
Flue
sensor
Boiler
sensor
Minimum gas
pressure switch
Earthing
terminal board
Supply sensor Safety
thermostat
Water
pressure
sensor
X12 X15 X14 X11
X02X00
Gas valve
Main
Switch
L N
230V~50Hz
Blower
Main switch Fuse
Fuse
Fuse
Fuse
Block signal
Relay 1
Relay 2
Relay 3
Fuse
Relay 4
Boiler Pump
Pump
Modulation
Cascade
Cascade Pump
(*)
(*)
(*)
(*)
Storage Tank
Pump
Room
Thermostat
Outside
Sensor
Remote
Alarm
Flue
Damper
Cascade
Sensor
(Sc)
0-10V
+-
Low voltage
room thermostat
Pump
Modulation
Master
Communication
Slave
Communication
ISPESL KIT
TS PRmax
3Way Valve
Storage Tank
Thermostat Storage Tank
Sensor (Sb)
Boiler Pump 2
(*)Maximum
admissible absorption 6.3A per single line, with total absorption <10A.
- 15 -
GENERAL
- 15 -

S - AF appliances are supplied in a single pack on a wooden pallet, protected by carton packaging and a wooden crate.
PRODUCT DELIVERY
A
The following material is supplied in a plastic envelope (A),
placed inside the packaging:
- Installation, operation and maintenance manual
- Warranty certificate and adhesive labels with bar code
- Hydraulic test certificate
- Spare parts catalogue.
bWARNINGS
•Always use suitable personal protective equipment when
removing packaging and handling the appliance.
•The manual is an integral part of the appliance and
therefore it is recommended to read it before installing
and operating the appliance. The manual should be stored
with care for future consultation and possible transfer to
another Owner or User.
DIMENSIONS AND WEIGHT
L
P
H
Dimensions
and Weights
S - AF
115 150 200 240 280
L 640 mm
D1115 1115 1335 1335 1335 mm
H 1200 mm
Net weight 180 190 240 257 274 Kg
- 16 -
INSTALLATION

≥ 1 m
≥
1 m
HANDLING
2
3
1
After removing the packaging, the appliance is handled
as follows:
- Remove the front panel (1) to facilitate pick-up and
handling.
- Insert two 1” pipes (2) in the relative slots or insert the
lift truck forks (3) under the structure.
- Lift the unit and handle as required.
bWARNINGS
•ALWAYS use suitable accident protection equipment.
•If the appliance is handled manually, take care to
observe the maximum weight that can be lifted per
person.
INSTALLATION ROOM
The installation room must always comply with current
technical standards and legislation in the country of use.
It must be equipped with suitably sized ventilation outlets.
INDICATIVE SAFETY ZONES
bWARNINGS
•Take into account the clearances required for
accessibility of the safety/adjustment devices and for
maintenance purposes.
•IT IS STRICTLY PROHIBITED to install S - AF
appliances outdoors, unless adequately protected
against atmospheric agents.
- 17 -
INSTALLATION

When the appliance is installed on systems that are old or to be updated, ensure that:
- The flue duct, if re-used, is suitable for the new condensing boiler, and that it is calculated and constructed in compliance
with current standards, as straight as possible, airtight, insulated and free of any obstructions or narrowed sections.
- The flue is fitted with an outlet for removal of condensate.
- The electrical system complies with the relevant standards and is set up by professionally qualified personnel.
- The fuel intake line and tank (if fitted) is produced according to the specific standards and is fitted with a gas meter.
- The expansion vessel ensures total absorption of fluid expansion in the system.
- The system is washed, removing all sludge and deposits and that all hydraulic seals are efficient.
- A supply water treatment/replenishment system is fitted, as described in the next chapter.
- Efficient systems are fitted for the elimination of air and impurities up to 5 μm (e.g. Y filters, micro-impurity
separators and micro air bubble separators).
- if an automatic filling system is fitted, a litre counter is installed in order for a precise check on the entity of any leaks.
- Water must never be drained from the system during routine maintenance, even in apparently insignificant quantities. For
example when cleaning filters, ensure that the system has specific shut-off valves for this purpose.
(*) The manufacturer declines all liability for possible damage caused by incorrect installation or design of the flue
or constant replenishment of water in the heating unit.
Before installing the appliance, thoroughly clean all pipelines and heating elements.
PROPERTIES OF WATER TO BE USED WHEN FILLING THE SYSTEM
The following type of water must be used to fill the system:
pH : from 6.5 to 8.5 (presence of aluminium)
Ca+++ Mg++ : less than 0.5°f
OH-+ 1/2 Ca3- : from 5 to 15°f
P2O5 : from 10 to 30 mg/l
Na2SO3 : from 20 to 50 mg/l
If the analysis of a sample of the water to be used for filling the system shows values other than those above, a suitable
inhibitor must be used. This will prevent the formation of scale, which could impair correct operation of the boiler unit.
In the case of systems at low temperatures only, a product must be used to inhibit the spread of bacteria.
Water treatment in civil heating systems: see standard UNI 8065 of 1989.
REPAIRS AND PARTS REPLACED DUE TO THE FORMATION OF SCALE ARE NOT COVERED BY THE WARRANTY.
CAUTION: both on new systems or replacements, the system must be fitted with efficient systems that eliminate the air
andimpuritiesupto5μm(e.g.Yfilters,microimpurityseparatorsandmicroairbubbleseparators).
NEW INSTALLATIONS OR REPLACEMENTS OF OLDER APPLIANCES
WATER TREATMENT
- 18 -
INSTALLATION

HYDRAULIC FITTINGS
MI
RI
MI
RI
As A
B
CDEF
The following section specifies the requirements of the heating unit hydraulic fittings.
Description S - AF
115 150 200 240 280
MI System supply 2” M Ø
RI System return 2” M Ø
As Syphon fitting 25 mm
A 400 mm
B 728 mm
C 175 175 245 245 245 mm
D 848 848 1088 1088 1088 mm
E 279 mm
F 363 mm
bWARNINGS
•Never soften water using the ion exchange principle.
•Never fill the system using distilled or demineralised water, as these cause serious corrosion of the aluminium heat
exchanger. The system must be filled and replenished with softened water to reduce overall hardness. The water must
also be treated to maintain the pH factor within the envisaged range, to avoid the risk of corrosion.
•On a register, note the quantity of filling water, top-up water, water quality readings and water treatment used.
•Install a meter to control the quantity of filling and top-up water.
•The conductivity of the untreated water in the system must NEVER exceed 600 µs/cm.
•If the system water is treated, strictly observe the instructions of the manufacturer of the product used, and ensure that
conductivity NEVER exceeds 2000 µs/cm.
•Intheeventofgeneratorreplacement,itisCOMPULSORYtowashtheentiresystem.
NOTE: If conductivity exceeds the values specified above, drain the system, flush it and fill with clean and treated tap water.
- 19 -
INSTALLATION

OPERATING PRINCIPLE DIAGRAMS
System Return
EAF
System Supply
System Return
EAF
UAC
System Supply
EAF
(*) Not supplied with heating unit. Available as accessory.
(*) Not supplied with heating unit. Available as accessory.
Example 1:
Heating-only system
Example 2:
System for the heating and production of DHW with
storage tank downline of hydraulic separator
1 Heating unit
2 Condensate drain syphon
3 Condensate neutraliser (*)
4 Drain
5 ISPESL safety module
6 Primary pump 1
1 Heating unit
2 Condensate drain syphon
3 Condensate neutraliser (*)
4 Drain
5 ISPESL safety module
6 Primary pump 1
7 Hydraulic separator
8 Screening filter
9 Shut-off valve
10 Supply manifold
11 Return manifold
12 System pump
7 Hydraulic separator
8 Screening filter
9 Shut-off valve
10 Supply manifold
11 Return manifold
12 System pump
13 Check valve
14 Expansion vessel
EAF Cold water inlet
13 Check valve
14 Expansion vessel
15 Remote storage tank
16 Storage tank pump
EAF Cold water inlet
UAC Domestic water utility
1
1
10
10
12
12 16
13
13
11
11
14
14
6
6
9
9
9
9
9
9
9
9
9
9
9
9
9
9
7
7
8
8
5
5
4
4
4
4
3
2
3
2
- 20 -
INSTALLATION