Radiant SFK 28 Service manual

SFK 28 - RAD - ING - Manuale - 1801.1_V3
Installation, Use
and Maintenance Manual
for model
0476
SFK 28
Condensing water heater

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SFK 28 - RAD - ING - Manuale - 1801.1_V3
SFK 28_EN
SUMMARY
SUMMARY
INTRODUCTION 4
1. INSTALLER SECTION 7
1.1. INSTALLATION 8
1.1.1. GENERAL INSTALLATION WARNINGS 8
1.1.2. WATER HEATER LOCATION ENVIRONMENTAL REQUIREMENTS 8
1.1.3. REFERENCE LEGISLATION 9
1.1.4. UNPACKING 10
1.1.5. POSITIONING AND MINIMAL TECHNICAL SPACES 11
1.1.6. OVERALL DIMENSIONS 12
1.1.7. JIG 12
1.1.8. RECIRCULATION MODE CIRCULATOR PREVALENCE/FLOW DIAGRAM 13
1.1.9. HYDRAULIC CONNECTION 14
1.1.10. RECIRCULATION MODE 15
1.1.11. D.H.W. PRODUCTION THRU A REMOTE TANK 16
1.1.12. FILLING THE CONDENSATE COLLECTION SIPHON 17
1.1.13. ANTI-FREEZE PROTECTION 18
1.1.14. GAS CONNECTION 19
1.1.15. ELECTRICAL CONNECTION 19
1.1.16. POWER SUPPLY 20
1.1.17. OPTIONAL ELECTRICAL CONNECTIONS 21
1.1.18. FUME EXHAUST FITTINGS 23
1.1.19. INSTALLATION MODES 24
1.1.20. TYPES OF FUME EXHAUST SYSTEMS 26
2. SUPPORT CENTRE SECTION 29
2.1. FIRST START-UP 30
2.1.1. PRELIMINARY OPERATIONS FOR FIRST START-UP 30
2.1.2. WATER HEATER COMMISSIONING 31
2.1.3. CO2 VALUE CHECK AND CALIBRATION 32
2.1.4. ACCESSING AND PROGRAMMING THE PARAMETERS 33
2.1.5. DIGITECH CS PARAMETERS TABLE 35
2.2. MAINTENANCE 39
2.2.6. GENERAL MAINTENANCE WARNINGS 39
2.2.7. TECHNICAL DATA 41
2.2.8. TECHNICAL ASSEMBLY 43
2.2.9. HYDRAULIC BOARD 44
2.2.10. WIRING DIAGRAM 46
2.2.11. ACCESSING THE WATER HEATER 47

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SFK 28_EN
SUMMARY
2.2.12. ACCESSING THE ELECTRONIC BOARD 48
2.2.13. EMPTYING THE DOMESTIC SYSTEM 49
2.2.14. FAULT SIGNALLING CODES 50
2.2.15. ACTIVE FUNCTIONS SIGNALLING CODES 53
2.2.16. GAS TYPE TRANSFORMATION 54
3. USER SECTION 55
3.1. USE 56
3.1.1. GENERAL USE WARNINGS 56
3.1.2. CONTROL PANEL 57
3.1.3. DISPLAY ICONS 58
3.1.4. INFO MENU DISPLAY DATA 59
3.1.5. START-UP 60
3.1.6. OPERATING MODE 60
3.1.7. INFORMATIONAL NOTE ON ANTI-FREEZE FUNCTION 60
3.1.8. FAULT SIGNALLING CODES 61
3.1.9. ACTIVE FUNCTIONS SIGNALLING CODES 63
3.1.10. FAST H2O FUNCTION 63
3.1.11. MAINTENANCE 64
3.1.12. COVER CLEANING 64
3.1.13. DISPOSAL 64

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_Prefazione_scaldabagno_EN
2.
INTRODUCTION
WARNING
Before starting any operation it is mandatory to
read this instruction manual, in relation to the
activities to be carried out as described in each
relevant section. Proper operation and optimal
performance of the water heater are ensured by
strict compliance with all the instructions given in
this manual.
The installation, use and maintenance manual is
an integral and essential part of the product and
must be delivered to the user.
MANUAL USERS
The manual users are all those who install, use
and maintain the water heater.
The water heater must be used and accessed
only by qualified operators that fully read and
understood the use and maintenance manual,
paying particular attention to the warnings.
READING AND SYMBOLS OF THE MANUAL
To ease the understanding of this manual,
recurrent symbols where used, in particular:
› On the outer margin of the page is placed a
thumb index indicating the type of user to which
the instructions in that section address.
› The titles are differentiated by thickness and
size in accordance with their hierarchy.
› The images contain important parts described
in the text, marked with numbers or letters.
› (See chap “chapter name”): this entry indicates
another section in the Manual that you should
refer to.
› Device: this term is used referring to the water
heater.
DANGER
It identifies an information related to a
general danger that if not complied with, may cause
serious personal damage or even death.
ATTENTION
It identifies an information that if not
complied with may cause small or medium level
lesions to the person or serious deterioration to the
water heater.
WARNING
It identifies a precaution information that
must be observed in order to avoid damaging the
machine or parts of it.
MANUAL STORAGE
The manual must be carefully stored and replaced
in case of deterioration and/or low legibility.
If you misplace the use and maintenance manual,
you can request it from the Technical Support
Centre giving the serial number and model of the
water heater indicated on the plate placed on the
right side of its casing.
As an alternative, the use and maintenance manual
can be downloaded free from the on-line site www.
radiant.it, accessing the “download” section and
entering the water heater model.
INTRODUCTION

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_Prefazione_scaldabagno_EN
2 .
MANUFACTURER WARRANTY AND
RESPONSIBILITY
The warranty of the Manufacturer is provided only
through its own authorized Technical Support
Centres, listed for each Region and Provence on
the site www.radiant.it, and covers all conformity
defects at the moment of sale.
The technical and functional features of the device
are ensured by its use in compliance:
1. with the use and maintenance instructions
contained in the manuals accompanying the
product, the content of which the customer
certifies that he is aware;
2. with the conditions and purposes to which
assets of the same type are intended.
For more information on the warranty validity,
its duration, the obligations and the exemptions,
please consult the First start-up certificate
attached to this manual.
The manufacturer reserves:
› the right to modify the tools and relative
technical documentation without any obligation
to third parties; neither will the company be
held responsible for any inaccuracies in this
handbook deriving from printing or translation
errors;
› the material and intellectual ownership of
this manual and forbids its distribution and
duplication, even partial, without prior written
authorization.
PRODUCT CONFORMITY
RADIANT BRUCIATORI spa with reference to art.
5 of DPR n 447 dated 06/12/1991, “Regulation
implementing of law 5 March 1990, n 46” and in
compliance with law 6 December 1971, n 1083
“Safety standards for the use of fuel gas”, declares
that its gas water heater are professionally
manufactured.
All water heaters obtained their CE certification
(D.M. 2 April 1998 regulation implementing art.32
Law 10/91).
The materials used such as copper, brass,
stainless steel create a homogeneous, compact
and functional assembly, easy to install and
manage. In its simplicity, the water heater is
equipped with all accessories necessary to render
it a veritable independent heating unit. All water
heaters are tested and delivered with a quality
certificate signed by the tester.
INTRODUCTION

The installation operations described in this section should
be performed only by qualified personnel, having the
appropriate technical training in the field for the installation
and maintenance of components of civil and industrial
domestic hot water production and heating plants.
1. INSTALLER SECTION1. INSTALLER SECTION

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SFK 28 - RAD - ING - Manuale - 1801.1_V3
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1. INSTALLATION
INSTALLER
1.1. INSTALLATION
1.1.1. GENERAL INSTALLATION
WARNINGS
ATTENTION
This machine may be used only for the
purpose for which it has been designed: heat water
to a temperature below boiling point at atmospheric
pressure. Any other use is considered wrong and
dangerous. The manufacturer is excluded from
any contractual or out of contract responsibility for
damage caused to people, animals or property due
to errors during installation.
ATTENTION
This water heater should be installed
only by qualified personnel, having the appropriate
technical training in the field for the installation and
maintenance of components of civil and industrial
domestic hot water production and heating plants.
ATTENTION
After having removed the packing, make
sure the equipment is intact. In case of doubt, do not
use the equipment and contact the supplier.
BEFORE INSTALLING THE WATER HEATER,
THE INSTALLER MUST MAKE SURE THAT THE
FOLLOWING CONDITIONS ARE MET:
› The device is connected to a heating plant and a
water supply network appropriate for its power
and performance.
› The location must be properly vented through
an air vent.
› The air vent must be placed at floor level to
prevent it from being obstructed, protected by
a grid that does not hamper the useful section
of passage.
› The device is suitable for use with the type of
gas available by checking the water heater
data plate (placed on the inner side of the front
casing.
› Make sure that the tubes and couplings are
perfectly sealed, without any gas leaks.
› Make sure that the grounding system works
properly.
› Make sure that the electrical systems is
suitable for the maximum power absorbed by
the equipment, value indicated on the data plate.
WARNING
Use only original RADIANT optional or kit
accessories (including electrical).
1.1.2. WATER HEATER LOCATION
ENVIRONMENTAL
REQUIREMENTS
The device’s installation location should be vented
due to the presence of threaded joints on the gas
adduction line. The location should be therefore
provided with vents as to ensure air exchange,
with output grid in the natural accumulation area
of eventual gas losses.
WARNING
DO NOT install the water heater in a
technical compartment near a swimming pool or a
laundry, to avoid that the combustion air is exposed
to chlorine, ammonia or alkaline agents that may
worsen the corrosion phenomenon of the heat
exchanger. Failure to observe this caution will void
the warranty of the heat exchanger.

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1. INSTALLATION
INSTALLER
WARNING
If the temperature in the water heater
installation location goes below -10 °C please insert
electrical resistances kit (see chapter ‘ANTI-FREEZE
PROTECTION’).
WARNING
The manufacturer will not be held
responsible for damages caused by incorrect
installation not in conformity with the over mentioned
instructions and not protected adequately from the
freeze.
1.1.3. REFERENCE LEGISLATION
The installation must be realized according to
the requirements of current legislation and in
compliance with local technical regulations,
according to the indications of the good technique.

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1 Disimballo_murale_scaldabagno_EN
1. INSTALLATION
INSTALLER
1.1.4. UNPACKING
WARNING
Please unpack the water heater just
before installing it. The Company is not responsible
for the damages caused to the device due to incorrect
storage.
WARNING
The packing elements (cardboard box,
wooden crate, nails, fasteners, plastic bags, expanded
polystyrene, etc.) must be kept out of the reach of
children as they may be dangerous. Therefore they
should be dismantled suitably differentiating them in
accordance with the standards in force.
To unpack the water heater, proceed as follows:
› Place the packed water heater on the floor (fig.
1-A) and remove the fasteners opening the four
flaps of the box outwards.
› Turn the water heater at 90° holding it with your
hand (fig. 1-B).
› Lift the box (fig. 1-C) and remove the guards (fig.
1-D).
C
B
D
A
fig. 1

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1Spazitecniciminimieposizionamento_scaldabagno_EN
1. INSTALLATION
INSTALLER
1.1.5. POSITIONING AND MINIMAL
TECHNICAL SPACES
The water heater must be installed only on a
vertical solid wall, able to sustain its weight.
In order to allow the access inside the water heater
for maintenance operations, you have to respect
the minimum technical spaces indicated in figure
1.
To facilitate the installation, the water heater is
provided with a jig that allows setting in advance
the connections to the tubes offering you the
possibility of connecting the water heater to
completed masonry works.
For machine positioning, proceed as follows (see fig. 2):
1. Trace a line using a spirit level (min. length 25 cm) on the installation wall.
2. place the top of the jig along the traced line respecting the distances of the water connections; then
mark the two points to insert the two knobs or the fasteners, then trace the points for the fume
exhaust fittings;
3. remove the jig and drill the wall;
4. hang the device using the knobs or the bracket and perform the connections.
3
142
70 80 10249 3178
Ø80
Ø125
Ø100
35826 26
54 54
821
681
699
302
785
H
B
A
Y
X
A - 200 mm
B - 300 mm
X - 60 mm
Y - 60 mm
H - 1000 mm
fig.1
fig.2

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1 Dimensioni_SFK 28_EN
1. INSTALLATION
INSTALLER
1.1.6. OVERALL DIMENSIONS
1.1.7. JIG
307
410
642
64
157
301
64
136
151
CRC G F
97 160 318438
130
95
C - HOT Ø 3/4”
RC - RECIRCULATION Ø 3/4”
G - GAS Ø 3/4”
F - COLD Ø 3/4”

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1Diagrammaportata-prevalenzacircolatore_SFK34_EN
1. INSTALLATION
INSTALLER
WARNING
Make sure, using a level, that the water
heater is properly inclined being levelled (see fig.1) so
as to allow the condense to drain.
1.1.8. RECIRCULATION MODE CIRCULATOR PREVALENCE/FLOW DIAGRAM
III Circulator priority maximum speed
II Circulator head at second speed
ICirculator head at minimum speed
Appliance Loss
fig.1
6
0
1
2
3
4
5
0 0.5 1 1.5 2 2.5
ZRS 12/6
III
II
I
6
0
1
2
3
4
5
0 0.5 1 1.5 2 2.5
PREVALENCE (m)
FLOW RATE (m3/h)

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1. INSTALLATION
INSTALLER
1.1.9. HYDRAULIC CONNECTION
DANGER
Make sure that the tubes of the water and
heating plant are not used as grounding system for
the electrical plant. There are not suitable for such
use.
WARNING
To prevent voiding the warranty and to
ensure the proper operation of the water heater,
please wash the plant (if possible when hot) with
suitable pickling or descaling solutions in order
to remove the impurities coming from tubes and
radiators.
WARNING
If the water heater is installed in a
hydrostatic position lower than those of the user
devices (radiators, fan coils, etc.), mount the shut-off
valves on the domestic water heating circuit to ease
the performance of the maintenance operations if it
is necessary only to empty the water heater.
WARNING
When connecting the equipment to
water supply, avoid excessive bending and recovery
operations from any off axis positioning that may
damage the tubes causing leaks, malfunction or
early wear.
WARNING
In order to avoid any vibrations and noises,
do not use tubes with small diameters or elbows with
small radius and significant cut-off of the passage
sections.
WARNING
Connect the water heater safety drains
to a discharge funnel. The manufacturer is not
responsible for any floods due to safety valve opening
in case of plant overpressure.
In order to prevent limestone build-up and
damages to the domestic water heat exchanger,
the hardness of the domestic supply water
should not exceed 15 °f. However, please check
the characteristics of the water used and install
suitable treating devices.
The heat exchanger coil cleaning frequency
depends on the hardness of the supply water and on
the presence of solid residues or impurities inside
the water that are often present in case of recently
installed plants. Based on the characteristics of
the infeed water, you should install suitable water
treating devices, for residues presence please
install a line filter.
The pressure of the cold infeed water should be
between 0.5 and 6 bar. In case of greater pressure
values, please install a pressure reducer upstream
from the water heater.

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1 Ricircolo_scaldabagno_SFK_EN
1. INSTALLATION
INSTALLER
1.1.10. RECIRCULATION MODE
The tankless water heater has within, as
standard,a recirculation system c/w circulating
pump which is aimed to provide a better well-being
for the domestic hot water needs, thus delivering
immediately a large amount of hot water.
To activate the recirculation mode, please proceed
as follows:
› turn the diverter valve onto the position
“recirculation”, as shown ‘RC’ in figure 1.
› activate the recirculation mode by pressing
simultaneously the ‘ ’ and ‘ ’ buttons of
the control panel (fig. 2). The activation of the
recirculation mode is displayed onto the control
panel by means of the ‘rc’ symbol.
› adjust the setting of the return temperature by
pressing ‘ ’ and ‘ ’ (fig. 3). The activation of
the pump is displayed onto the control panel by
means of the pump ‘ ’ symbol.
To detect the return temperature, the system
activates the pump for 20 seconds every 10
minutes.
If the temperature detected therein, by the
recirculation sensor, is lower than the required
one, the pump activates and the appliance operates
at the minimum fire rating.
When the required temperature is achieved,
the appliance shuts-off and the pump runs for
40 seconds (this latter value can be adjusted by
means of parameter P04). The highest possible
temperature of the domestic hot water, during
the recirculation mode, is of 53 °C. When this
temperature is achieved, the appliance shuts-off
whilst the pump keeps running. The appliance is
activated again when the temperature falls to 50 °C.
RC
fig. 1
fig. 2
fig. 3

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1. INSTALLATION
INSTALLER
1.1.11. D.H.W. PRODUCTION THRU A
REMOTE TANK
The water heater can also actually feed a remote
tank meant for the D.H.W. (domestic hot water)
storage. The pump integrated within the water
heater, designed ex-factory for the recirculation
loop, can load the external tank. This leads to a
larger D.H.W. production to satisfy multiple draws
from the taps.
To activate this function, please proceed as follows:
› Turn the three-way valve to the “recirculation”
position, as shown in Figure 1 as ‘RC’.
› Arrange the hydraulic connections as per the
scheme ‘D.H.W. PRODUCTION THRU A REMOTE
TANK‘, as per chapter ‘HYDRAULIC BOARD’.
› Disconnect the two faston of the recirculation
probe (see B-fig. 2), and connect them onto
the optional probe meant for the storage (part
number: 40-00324, see fig. 2). Insert this latter
probe into the sensor-holder of the storage
tank.
› Enter the menu parameters and set the value of
the parameter P02 to ‘1’ = STORAGE TANKLESS
(see chapters ‘DIGITECH CS PARAMETERS
TABLE’ and ‘ACCESSING AND PROGRAMMING
THE PARAMETERS’);
› Set the temperature setpoint of the D.H.W. tank
by pressing ‘ ’ and ‘ ’ the sanitary (fig.
3).
RC
cod.: 40-00324
B
fig. 1
fig. 2
fig. 3

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1. INSTALLATION
INSTALLER
1.1.12. FILLING THE CONDENSATE
COLLECTION SIPHON
Before starting the water heater you have to fill the
condensate collection siphon in order to avoid fuel
reflux through the siphon.
Fill the condensate collection siphon as follows
(see fig. 1):
› With a glass pour the water in the heat
exchanger’s flue exhaust duct outlet (see fig. 1),
up to fill the condensate trap to the highest point
“T” (fig. 1);
› Connect the dedicated flexible condensate
draining tube to a waste disposal system.
The condensate can be drained directly in
the sewerage system by inserting an easily
serviceable siphon.
T
fig. 1

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1. INSTALLATION
INSTALLER
1.1.13. ANTI-FREEZE PROTECTION
The water heater is protected against freezing
thanks to the electronic board preparation with
functions that start the burner and heat the
concerned parts when their temperature goes
below the minimum pre-set values, protecting
the water heater up to an external temperature of
-10°C.
The device starts when the hot water temperature
goes below 5 °C, automatically starting the burner
until the water reaches the temperature of 15 °C.
The system starts even if on the display appears
“OFF”, as long as the water heater is connected to
the power (230 V) and gas supply.
For long periods of standby, please empty the
water heater.
If the temperature goes below -10 °C please insert
electrical resistances kit (cod. 82259LP).

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1. INSTALLATION
INSTALLER
1.1.14. GAS CONNECTION
DANGER
In order to connect the gas connector of
the water heater to the supply pipe use a stop seal of
an appropriate size and material. The use of hemp,
teflon tape or similar materials is strictly forbidden.
BEFORE PERFORMING THE GAS CONNECTION,
MAKE SURE THAT:
› the gas adduction line complies with the
standards and regulations in force;
› the tubing's section suits the requested capacity
and its length;
› the tubing is equipped with all safety and control
devices required by the standards in force;
› the internal and external seals of the gas infeed
plant are checked;
› the device is suitable for use with the type of
gas available by checking the water heater
data plate (placed on the inner side of the front
casing. If they do not match you must take
the necessary measures to adapt the water
heater to another type of gas (see chapter GAS
TRANSFORMATION);
› the gas supply pressure falls within the values
indicated on the data plate.
1.1.15. ELECTRICAL CONNECTION
DANGER
The equipment is electrically safe only
if it is properly connected to an efficient grounding
system, performed in compliance with the safety
standards in force. You should check this essential
safety requirement. If in doubt, request an accurate
check of the electrical system performed by qualified
staff, as the manufacturer is not responsible for any
damages caused by lack of grounding system.
› Make sure that the electrical systems is
suitable for the maximum power absorbed by
the equipment, value indicated on the data plate.
› make sure that the cables section is appropriate
for the maximum power absorbed by the
equipment and that it is however not lower than
1 mm2.
› The equipment works with alternating current
of 230 V and 50 Hz. The electrical connection
must be performed using an all-pole switch with
an opening of at least 3 millimetres between
contacts placed upstream from the device.
WARNING
Make sure that the phase and neutral
cables connection is performed in compliance with
the wiring diagram (see chapter POWER SUPPLY).
WARNING
It is strictly forbidden the use of adaptors,
multiple plugs and/or extensions for the general
power supply of the equipment from the electrical
network.

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1 Alimentazione elettrica_SFK_EN
1. INSTALLATION
INSTALLER
1.1.16. POWER SUPPLY
To power the water heater connect the electrical
cables to the terminal inside the control panel as
follows:
DANGER
Cut off the voltage from the main switch.
› remove the water heater's front casing (refer to
chapter ACCESSING THE WATER HEATER).
› loosen the two screws and remove the plate “A”
(see fig. 1).
› after removing the plate, connect the electrical
cables to terminal “B” (see fig. 1):
· the yellow/green cable to the terminal marked
with grounding symbol “ ”.
· the blue cable to the terminal marked with
“N”.
· the brown cable to the terminal marked with
“L”.
After performing these operations, remount plate
“A” and the front casing.
LN
A
RcRc
B
BLUE
YELLOW/GREEN
BROWN
fig. 1