Saunier duval ISOFAST F 28 E User Manual
ISOFAST
Heating and hot water for the professionals
IN WARRANTY
TECHNICAL HELPLINE
THIS IS A CAT I2E+ APPLIANCE
01773 828400
01773 828100
1
INSTALLATION AND OPERATING INSTRUCTIONS
ISOFAST F 28 E - ISOFAST F 35 E
Note!
The boiler serial number is marked on the label attached to the inside of the drop down door. Refer to the
'Introduction' section page 3 for a description of the basic functions of the boiler. The 'Users' section
describes how to safely operate the boiler.
USERS SECTION
Introduction.................................................... Page 3
Commissioning..........................................................3
Controls & lighting ....................................................4
Clock-Instructions for use ........................................ 5
Draining ..................................................................... 5
Servicing/maintenance .......................................... 5
SERVICING SECTION
Routine cleaning and inspection ........................... Page 20 - 21
Replacement of parts ......................................................... 21 - 25
Boiler schematic .......................................................................... 26
Technical data ............................................................................ 27
Schematic wiring diagram ........................................................ 28
Fault finding........................................................................... 29 - 31
Spare parts ................................................................................... 31
INSTALLATION SECTION
Introduction.................................................. Page 3
Technical data ...................................................... 6
Dimensions ............................................................. 7
Heating system design ......................................... 7
Domestic hot water system design..................... 8
Boiler schematic .................................................... 8
Fixing jig .................................................................. 9
Piping system installation...................................... 9
Boiler location ...................................................... 10
Boiler installation .................................................. 11
Flue installation ............................................. 11 - 12
Electrical installation ........................................... 13
Commissioning.............................................. 14 - 17
Safety devices .............................................. 17 - 18
Settings.................................................................. 19
Mandatory warning for CEE countries
Warning: This appliance is designed, approved and inspected to meet the requirements of the English
market. The identification plate located on the inside of the appliance certifies the origin where the
product was manufactured and the country for which it is intended.
If you see any exception to this rule, please contact your nearest Saunier Duval dealer.
Thank you in advance for your assistance.
2
INTRODUCTION
The
ISOFAST F
combination boiler with electronic ignition providing central heating and instantaneous hot water.
The boiler is equipped with a 4 litre domestic hot
water storage vessel that ensures maximum hot
water temperature stability during domestic
demand.
The boiler is of the I2E+ category for use with Natural Gas (G20) as distributed in the United Kingdom,
or Butane (G30), Propane (G31) or Towns Gas
(G130) with the appropriate conversion kit.
The boiler has a fan assisted balanced flue which
both discharges the products of combustion to and
draws the combustion air from the outside of the
room.
The boiler is suitable for top outlet flue connection
only but, can be fitted with horizontal flue, vertical
flue or twin-pipe flue. Refer to flue catalogue for
further details.
Both the central heating and domestic hot water
temperature are user adjustable from the boiler
control panel.
Domestic hot water demand always has priority
over heating demand.
The boiler is designed for use as part of a sealed
water central heating system with fully pumped
circulation. The pump, expansion vessel and associated safety devices are all fitted within the boiler.
The boiler can be installed against either an external wall or on an adjacent inside wall, that is, the
boiler is a wall mounted modulating
flue system will pass directly to the rear or to either
side to the terminal fitted on the outside wall face.
The installation must be carried out by a competent person in accordance with the relevant requirements of The Building Regulations, The Water
Byelaws, The Building Standards (Scotland) Regulations and any applicable local regulations.
These instructions should be carefully followed for
the safe and economical use of your boiler.
Ancillary equipment
A range of flue accessories are available including vertical flues, twin-pipe flues, bends etc.
For further information contact your supplier.
Substances Hazardous to Health
The adhesives and sealants used in this appliance
are cured and give no known hazard in this state.
INSULATION PADS/CERAMIC FIBRE, GLASSYARN,
MINERAL WOOL
These can cause irritation to skin, eyes and the
respiratory tract. If you have a history skin complaint
you may be susceptible to irritation. High dust levels
are usual only if the material is broken.
Normal handing should not cause discomfort, but
follow normal good hygiene and wash your hands
before eating, drinking or going to the toilet.
If you do suffer irritation to the eyes or severe irritation
to the skin, seek medical attention.
COMMISSIONING
Gas safety (Installation and use) Regulations
In your interests and that of gas safety, it is the law
that ALL gas appliances are installed and serviced
by a competent person in accordance with the
above regulations.
Gas leak or fault
If a gas leak or fault exists or is suspected, turn the
boiler off and consult the local gas supply company or your installation/service company.
Air in the heating system
Persistent air in the heating system may indicate
leaks in the system or corrosion taking place. Call
your Installation/Servicing company.
1-On/Off button
2-Summer/Winter mode selector
3-Hot water temperature adjuster
4-Hot water set point display
5-Graphic display
6-Heating temperature adjuster
7-Heating set point display
8-Display backlight
Overheating safety
In the event of a problem, the overheating safety
devices cause safety shutdown of the boiler. If this
happens, call your Installation/Servicing company.
Boiler controls
The control panel, located at the lower front of the
boiler casing, see diagram 1, allows the boiler to
be started, shut down, controlled and monitored
during use.
Flue
Do not obstruct the outside terminal of the boiler.
158 7 26 34
IO
1
2
4
2
23
3
22
4
21
5
20
6
1
9
0
1
1
1.5
bar
mode
7
8
8
1
7
9
1
6
0
1
1
5
11
1
4
2
1
13
Diagram 1
Hab 263
3
e
CONTROLS AND LIGHTING
Lighting the boiler :
Make sure that:
● The boiler is connected to the electrical supply.
● The gas service cock is open.
Then follow the instructions below :
Press the On/Off button (1)
1
The pressure must be between 1 and 2 bar. If not, the system must be filled by a competent person.
1.5
bar
To stop the boiler : Press button (1)
mode
IO
1
1
2
4
2
2
3
3
22
4
2
1
5
6
7
8
20
1
9
18
1
7
9
16
0
1
15
11
1
4
12
13
0
1
Hab 264
Setting to the SUMMER position
(Hot water only)
Appuyer sur mode pour sélectionner la position été
Press the mode button to select the summer symbol
mode
1.5
bar
The flame symbol appears
Apparaît lorsque le brûleur
when the boiler is running
est en fonctionnement
Adjusting the hot water temperature
Press + or - to adjust the maximum temperature
Appuyer sur + ou - pour ajuster la température
of the hot water (38°C to 60°C)
maximale de l'eau chaude sanitaire (38
Visual indication of set temperature
Visualisation de la température demandée
°
C à 60°C)
Setting to the WINTER position
2
Press the mode button to select the winter symbol
Appuyer sur mode pour sélectionner la position hiver
The actual temperature
Température actuelle
of the heating system
dans le circuit chauffage
Adjusting the heating temperature
3
Press + or - to adjust the maximum temperature
Appuyer sur + ou - pour ajuster la température
of the heating (38°C to 87°C)
maximale souhaitée du circuit chauffage
(Heating + hot water)
°C
10
Visual indication of set temperature
Visualisation de la température demandé
1.5
bar
Illuminates when
Apparaît lorsque le
the boiler lights
brûleur fonctionne
mode
mode
50
°C
mode
60
°C
To obtain domestic hot water, open a hot water tap. Hot water always has priority over central heating.
4
Hab 261
CLOCK - INSTRUCTIONS FOR USE
The boiler must be conected to the electrical supply and switched on.
Setting the time
Rotate the clock actuater mechanism clockwise,
by hand, until the current time is indicated by the
arrow, see diagram 2.
Note: The time is set in 24 hour format, for example,
1300 for 1pm.
Diagram 2
Reg 049
Setting the programme "On" and "Off" times
● Select the "On" times by pushing the white tap-
pets to the outside, see diagram 2.
● Select the 'Off' times by pushing the white tap-
pets to the inside, see diagram 2.
The clock shown in diagram 2 is set as follows:
ON ➜ 07.00am to 09.00am (7-9)
OFF ➜ 09.00am to 4.00pm (9-16)
ON ➜ 4.00pm to 10.00pm (16-22)
OFF ➜ 10.00pm to 07.00am (22-7)
To override or advance the
clock
The clock has a manual On/
Off switch, see diagram 3,
which operates as follows :
Upper position
Heating On/Off as set by the
tappets.
Middle position
Heating Off continuously
Lower position
Heating On continuously
Diagram 3
Reg 050
DRAINING
Protection against freezing
If the boiler is to be out of use for any long periods
during severe weather conditions, it is recommended that the whole system, including the boiler,
be drained to avoid the risk of freezing.
If in doubt, consult your servicing company.
The
ISOFAST
has a built in frost protection device
that protects the boiler from freezing. If the boiler is
to be left and there is a risk of frost, ensure that the
gas and electrical supplies are left connected. The
frost protection device will light the boiler when the
temperature of the boiler water falls below 6°C.
When the temperature reaches 16°C, the boiler
stops.
Note: This device works irrespective of any room
thermostat setting and will protect the complete
heating system.
SERVICING/MAINTENANCE
To ensure the continued efficient and safe operation of the boiler, it is recommended that it is
checked and serviced at regular intervals.
The frequency of servicing will depend upon the
installation conditions and usage but, in general,
once a year should be enough.
Draining and filling
Caution: The boiler is installed as part of a sealed
system which must only be drained and filled by a
competent person.
Heating safety valve
CAUTION: A heating safety valve with a discharge
pipe is fitted to this boiler.
The valve MUST NOT BE TOUCHED except by a competent person. If the valve discharges at any time,
switch the boiler off and isolate it from the electrical supply. Contact your installation/service company.
Pressure relief valve
CAUTION: A domestic hot water pressure relief
valve, with a discharge pipe is fitted to this boiler.
The valve MUST NOT BE TOUCHED except by a competent person. If the valve discharges at any time,
switch the boiler off and isolate it from the electrical supply. Contact your installation/service company.
Cleaning
The boiler casing can be cleaned with a damp
cloth followed by a dry cloth to polish.
Do not use abrasive or solvent cleaners.
Boiler casing
CAUTION. Do not remove or adjust the casing in
any way, as incorrect fitting may result in faulty
operation. If in doubt, consult your installation/service company.
5
TECHNICAL DATA
Heating
ISOFAST F 28 E
Heating output ajustable from ... (kW) 10,4 11,7
to ... (kW) 27,6 34,6
from ... (BTU/H) 35,485 39,920
to ... (BTU/H) 94,170 118,053
Efficiency (%) 82 83
Maximum heating temperature (°C) 87 87
Expansion vessel effective capacity (l) 7 12
Expansion vessel charge pressure (bar) 0,5 0,5
Maximum system capacity at 75°C (l) 160 275
Safety valve,
maximum service pressure (bar) 3 3
Products outlet diameter (mm) 60 60
Fresh air inlet diameter (mm) 100 100
Electrical supply (V) 230 230
Maximum absorbed power (W) 220 220
Level of protection IP44 IP44
ISOFAST F 35 E
Hot water
ISOFAST F 28 E
Hot water output
automatically variable from ... (kW) 10,4 11,7
to ... (kW) 27,6 34,6
from ... (BTU/H) 35,485 39,920
to ... (BTU/H) 94,170 118,053
Maximum hot water temperature (°C) 60 60
Specific flow rate (for 30°C temp rise)
(l/min.) 13,2 16,5
Threshold flow rate (l/min.) 1 1
Nominal water flow rate (l/min.) 11,3 16,5
Maximum supply pressure (bar) 8 8
Minimum operating pressure (bar) 0,7 0,7
Natural Gas (G20)
Ø Burner injector (mm) 1,20 1,20
Inlet pressure (mbar) 20 20
Burner pressure (mbar) 13,8 14,1
Gas rate maximum (m3/h) 3,20 3,98
Gas rate minimum (m3/h) 1,32 1,48
ISOFAST F 35 E
Pump 28 kW
60
50
40
30
20
10
heating supply and return lines
Available pressure (kPa) between
(10 kPa = 1 m WG)
1
1
2
3
4
0
Bypass fully shut
5
6
Flow rate through heating system (I/h)
Open 1/4 turn
2
120010008006004002000
3 4 5
Pump 35 kW
80
70
60
50
40
30
20
10
heating supply and return lines
Available pressure (kPa) between
Pom 010 a
0
(10 kPa = 1 m WG)
Open 1/2 turn
4
5
Open 1 turn
1
2
3
Pom 058
Flow rate through heating system (I/h)
120010008006004002000
Open 2 turns
DIMENSIONS
380
X
890
65
234
The
ISOFAST
- the boiler itself
- the fixing jig
- the flue system
Weight: 51,2 kg
is delivered in three separate packages:
X = 470 (
552 (
Diagram 5
Isofast F 28 E
Isofast F 35 E
)
)
HEATING SYSTEM DESIGN
● The
ISOFAST
tallation.
● Heating surfaces may consist of radiators, con-
vectors or fan assisted convectors.
● The
ISOFAST
floor heating system without the need for a mixing
bottle. The maximum central heating flow temperature can be set to 53°C.on the boiler printed
circuit board during commissioning.
● Pipe sectional areas shall be determined in ac-
cordance with normal practices, using the output/
pressure curve (diagram 4). The distribution system
shall be calculated in accordance with the output
requirements of the actual system, not the
maximum output of the boiler. However, provision
shall be made to ensure sufficient flow so that the
temperature difference between the flow and return pipes be less than or equal to 20°C. The minimum flow is 400 l/h.
● The piping system shall be routed so as to avoid
any air pockets and facilitate permanent venting
of the installation. Bleed fittings must be provided
at every high point of the system and on all radiators.
is compatible with any type of ins-
can be piped directly to an under-
● The total volume of water permitted for the heat-
ing system depends, amongst other things, on the
static head in the cold condition. The expansion
vessel on the boiler is pressurised at 0,5 bar (corresponding to a static head of 5 m w.g.) and allows
a maximum system volume of 160 litres for an average temperature of 75°C and a maximum service
pressure of 3 bar. This pressure setting can be modified at commissioning stage if the static head differs. An additional expansion vessel can be fitted
to the system if required, see diagram 8.
● Provision shall be made for a drain valve at the
lowest point of the system.
● Where thermostatic radiator valves are fitted, not
all radiators must be fitted with this type of valve,
and in particular, where the room thermostat is installed.
● In the case of an existing installation, it is ESSEN-
TIAL that the system is thoroughly flushed prior to
installing the new boiler.
Filling the system
The
ISOFAST
vice, see diagram 7.
is supplied with a built-in filliing de-
7422
7
DOMESTIC HOT WATER SYSTEM DESIGN
● Copper tubing or plastic Hep 20 may be used for
the domestic hot water system. Unnecessary
pressure losses should be avoided.
● A flow restrictor limiting the flow through the boiler
to a maximum of 16 l/min is fitted to the boiler.
● The boiler will operate with a minimum supply
pressure of 0,7 bar, but under reduced flow rate.
Best operating comfort will be obtained from a supply pressure of 1 bar.
BOILER SCHEMATIC
'Hard Water Areas'
In areas where the water is 'hard', more than
200mg/litre, it is recommended that a proprietary
scale reducer is fitted in the cold water supply to
the boiler.
1-Domestic thermistor
2-Three way valve
3-Gas valve
4-Gas valve ignition module
5-Heating element
6-Micro accumulation vessel
7-Burner
8-Ignition electrode
9-Combustion chamber
10 - Micro accumulation vessel thermistor
11 - Main heat exchanger
12 - Air pressure switch
13 - Heating safety valve (3 bar)
14 - Electronic control (PCB)
15 - Domestic water flow sensor
16 - Bypass
17 - Domestic heat exchanger
18 - Pump
19 - Expansion vessel
20 - Heating thermistor
21 - Overheat safety thermostat
22 - Flame sense electrode
23 - Fan
24 - Domestic safety valve
25 - Loss of water sensor
A-Heating return
B-Cold water inlet
C-Heating flow
D-Domestic hot water outlet
E-Gas
23
21
22
20
19
18
17
16
15
14
25
13
Diagram 6
12
11
9
8
7
4
3
2
1
24
AB C DF
Shy 120
8
FIXING JIG
The fixing jig is made up, from left to right, as follows:
A- Heating return fitting with isolating valve(v) and
drain knob (u).
B- Cold water inlet fitting with isolating valve
(m)and factory fitted flow regulator and filter (not
shown).
u
Diagram 7
A
B
v
m
G
t
PIPING SYSTEM INSTALLATION
C- Heating flow fitting with isolating valve (q),
drain knob (r) and safety valve (s1).
D- Domestic hot water outlet fitting with safety
valve (s2).
F- Gas fitting.
G- Filling device.
C
r
D
F
q
Pla 213
● Heating system connections - Pipe diam. 22mm
● Hot water system connections - Pipe diam. 15mm
● Gas connection - Pipe diam. 22mm
● Domestic safety valve connection - Pipe
diam.15mm
● Heating safety valve connection - Pipe diam.
15mm
Water connection
Connect the copper connections supplied, to the
fixing jig fittings, see diagram 7. Connect the system pipework to the boiler observing the correct
flow and return format as shown in diagram 8.
Safety valve discharge
Tee the domestic safety valve outlet pipe to the
heating safety valve outlet pipe and extend horizontally to the outside wall.
WARNING. It must not discharge above an entrance or window or any type of public access
area.
Connect the safety valve discharge pipe to the
outlets of both the heating safety valve and the
hot water safety valve, the discharge must be extended using not less than 15 m o.d. pipe, to discharge in a visible position outside the building, facing downward preferably over a drain.
The pipe must have a continuous fall and be routed
to a position so that any discharge of water, possibly boiling or steam, cannot create any danger to
persons, damage to property or external electrical components and wiring. Tighten all pipe connection joints.
Gas connection
● The supply from the governed gas meter must be
of adequate size to provide a constant inlet working pressure of 20 mbar (8 in w.g.).
To avoid low gas pressure problems, it is recommended that the gas supply is connected using 22
mm pipe.
● On completion, the gas installation must be
tested using the pressure drop method and purged
in accordance with the current issue of BS6891.
Gas Safety (Installation and use) Regulations
In your interests and that of gas safety, it is the law
that ALL gas appliances are installed and serviced
by a competent person in accordance with the
above regulations.
Additional
expansion
vessel
(if required)
Return
Heating
circuit
Flow
control valve
Boiler
Bypass
valve
Filling device
Drain point
Domestic
water
Hot
Cold supply
Diagram 8
Sch 173a
9
BOILER LOCATION
Clearances
The position of the boiler must be such that there is
adequate space for servicing.
The recommended clearances are:
20 mm either side of the boiler.
600 mm at the front of the boiler.
300 mm below the boiler.
● Place template on wall in required position, mak-
ing allowances for the necessary clearances etc.
Note: It is permissible to install the boiler with smaller
clearances than those quoted above PROVIDING
that adequate consideration is given for Servicing/
Repairs at a later date. If any doubt exists, contact
the Saunier Duval Technical Helpline 01773 828400.
● Mark the position of the holes for the hanging
bracket.
● Drill, plug and fix the hanging bracket to the wall
using suitable screws.
● Check that the hanging bracket is level.
● For horizontal flue system, mark the position for
the flue hole as follows:
Flue to rear of boiler
● Mark correct position of hole from template.
Flue to side of boiler
● Mark the horizontal centre line for the hole on the
rear wall. Extend the horizontal centre line to the
side wall and mark the vertical centre line of flue
hole as shown in diagram 9.
Cutting the flue hole
● Making allowance for the slope of the flue, cut
hole in external wall, preferably using a core drill.
For installations with internal and external access
use a 10 5 mm diameter core drill.
For installations with internal access only use a 125
mm diameter core drill.
Important
When cutting the flue hole and when extending
the flue centre line to a side wall, remember that
the flue system must have a fall of about 35 mm
per metre of flue DOWNWARD towards the termi-
Diagram 9
nal. There must NEVER be a downward incline towards the boiler.
Terminal position
The minimum acceptable spacings from the terminal to obstructions and ventilation openings are
shown in diagram 10.
The boiler must be installed so that the terminal is
exposed to the external air.
Should any doubt exist as to the permissible position of the terminal, contact the Saunier Duval
Technical Helpline 01773 828400.
Terminal guard
If a terminal guard is required, a suitable guard can
be obtained from your supplier, Saunier Duval part
number 85373.
Cupboard or compartment ventilation
The boiler can be fitted in a cupboard or compartment without the need for permanent ventilation.
Ins 050b
Minimum dimensions (in mm) for the positioning of flue terminals
A-Under a window .................................................... 300
B-Under an air vent .................................................. 300
C-Under a gutter ......................................................... 75
D-Under a balcony ................................................... 300
E-From an adjacent window .................................. 300
F-From an adjacent air vent ................................... 300
G-From vertical or horizontal air pipes.................... 300
H-From an external corner of the building ............ 300
I-From an internal corner of the building ............. 300
L-From the ground or from another floor .............. 300
M- Between two terminals vertically ...................... 1500
N-Between two terminals horizontally .................... 600
Diagram 10
10
G
C
N
E
F
M
A
B
D
I
L
H
Ven 060b
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