Radiant SFK 55 User manual

SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
Installation, Use
and Maintenance Manual for
model
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
-Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
-WHAT TO DO IF YOU SMELL GAS
>Do not try to light any appliance.
>Do not touch any electrical switch; do not use any phone in your building.
>Immediately call your gas supplier from an outside phone. Follow the gas supplier’s instructions.
>If you cannot reach your gas supplier, call the fire department.
-Installation and service must be performed by a qualified installer, service agency or the gas supplier.
SFK 55

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
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. OVERALL DIMENSIONS (inch) 11
1.1.6. POSITIONING AND CLEARANCES TO COMBUSTIBLE MATERIAL AND SERVICE CLEARANCES 12
1.1.8. CIRCULATOR PERFORMANCE CURVE 14
1.1.9. WATER CONNECTION 15
1.1.10. RECIRCULATION MODE 16
1.1.11. PIPING DIAGRAM FOR BASIC INSTALLATION 17
1.1.12. CONDENSATE DRAIN 18
1.1.13. ANTI-FREEZE PROTECTION 20
1.1.14. PRESSURE RELIEF VALVE KIT 21
1.1.15. GAS CONNECTION 22
1.1.16. ELECTRICAL CONNECTION 22
1.1.17. POWER SUPPLY 23
1.1.18. OPTIONAL ELECTRICAL CONNECTIONS 24
1.1.19. VENTING 25
1.1.20. TYPES OF EXHAUST SYSTEMS 27
1.1.21. TABLE 1: ALLOWABLE VENT LENGTHS 31
2. SUPPORT CENTER SECTION 33
2.1. FIRST START-UP 34
2.1.1. PRELIMINARY OPERATIONS FOR FIRST START-UP 34
2.1.2. WATER HEATERS COMMISSIONING 35
2.1.3. CO2 VALUE CHECK AND CALIBRATION 36
2.1.4. ACCESSING AND PROGRAMMING THE PARAMETERS 37
2.1.5. PARAMETERS TABLE 39
2.2. MAINTENANCE 43
2.2.6. GENERAL MAINTENANCE WARNINGS 43
2.2.7. TECHNICAL DATA 44
2.2.8. TECHNICAL ASSEMBLY 46
2.2.9. INTERNAL PIPING SCHEMATIC 47
2.2.10. OPERATIONAL SCHEMES 48
2.2.11. WIRING DIAGRAM 49

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
SUMMARY
2.2.12. ACCESSING THE WATER HEATERS 50
2.2.13. ACCESSING THE ELECTRONIC BOARD 51
2.2.14. EMPTYING THE DOMESTIC SYSTEM 52
2.2.15. FAULT SIGNALLING CODES 53
2.2.16. ACTIVE FUNCTIONS SIGNALLING CODES 56
2.2.17. POSITIONS OF THE ELECTRODES 57
2.2.18. CONVERSION TO A DIFFERENT GAS TYPE 58
3. USER SECTION 59
3.1. USE 60
3.1.1. GENERAL USE WARNINGS 60
3.1.2. CONTROL PANEL 65
3.1.3. DISPLAY ICONS 66
3.1.4. INFO MENU DISPLAY DATA 67
3.1.5. START-UP 68
3.1.6. OPERATING MODE 68
3.1.7. INFORMATIONAL NOTE ON ANTI-FREEZE FUNCTION 68
3.1.8. FAULT SIGNALLING CODES 69
3.1.9. ACTIVE FUNCTIONS SIGNALLING CODES 71
3.1.10. FAST H2O FUNCTION 71
3.1.11. MAINTENANCE 72
3.1.12. COVER CLE ANING 72
3.1.13. DISPOSAL 72

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
INTRODUCTION
WARNING
Before starting any operation it is mandatory
to read this instruction manual, in relation to
the activities performed as described in each
relevant section. Proper operation and optimal
performance of the water heaters 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 heaters.
The water heaters 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.
› Unit: this term is used referring to the water
heaters.
DANGER
It identifies information related to a
general danger that if not complied with, may
cause serious personal damage or even death.
ATTENTION
It identifies information that if not
complied with may cause small or medium level
burns to the person or serious damage to the
water heaters.
WARNING
It identifies a precaution information
that must be observed in order to avoid damaging
the machine or various parts.
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 a copy from the Technical Support
Center providing. It is important to provide the
model number and serial number of the unit which
is found on the inside surface of the right panel
INTRODUCTION

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
MANUFACTURER WARRANTY AND
RESPONSIBILITY
The Manufacturer’s warranty is provided
only through authorized Technical Support
Centers, listed for each Region on the site
www.radianthydronics.com, and covers all
manufacturing defects at the time of sale.
The technical and functional features of the unit are
ensured when proper installation and maintenance
is carried out. Conditions of Manufacturer’s
warranty includes the following.
1. The customer is aware of and follows
instructions contained in the manuals that
accompany the product.
2. Annual service check up is required to keep
warranty valid.
3. The unit is installed and operated in the
conditions in which it is designed to.
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;
› 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 ANSI
Z21.10.3-2015 • CSA 4.3-2015 GAS-FIRED Water
heatersS, declares that its gas water heaters are
professionally manufactured.
The materials used such as copper, brass,
stainless steel create a homogeneous, compact
and functional assembly, easy to install and
maintain. The water heaters. is equipped with all
accessories necessary to provide a dependable
independent heating unit. All water heaterss are
tested and delivered with a quality certificate
signed by the testing department.
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 SECTION
1. INSTALLER SECTION

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1. INSTALLATION
1.1.1. GENERAL INSTALLATION
WARNINGS
This water heater must be installed in accordance
with local codes, if any; if not, follow the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, or the
Natural Gas and Propane Installation Code, CAN/
CSA B149.1, as applicable.
WARNING
This unit 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.
WARNING
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.
WARNING
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 PRESENT:
› The unit is connected to a heating unit 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 airflow.
› The unit 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 gas lines are properly sealed
without any gas leaks.
› Make sure that the grounding system works
properly.
› Make sure that the electrical system is suitable
for the maximum power required 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
Thewaterheatershallbeinstalledsothegasignition
system components are protected from water
(dripping, spraying, rain, etc.) during appliance
operation and service (circulator replacement,
condensate trap, control replacement, etc.).
The water heater installed using inside air supply
must provide provisions for Combustion Air and
Ventilation Air in accordance with section 5.3, Air
for Combustion and Ventilation, of the National
Fuel Gas Code, ANSI Z 223,1/NFPA 54, or section
7,2, 7.3, or 7.4, of CAN/CSA B 149, Installation
Codes, or local codes having jurisdiction.
Where an exhaust fan or any other air consumption
appliance is installed in the same space as the

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
water heater, sufficient air openings must be
available to provide fresh air when all appliances
are operating simultaneously. It is essential that
in rooms where the water heater is installed
to provide as much air as required by normal
combustion of the gas consumed by the various
appliances. Consequently, it maybe necessary to
make openings in the walls to provide the air inlet
into the rooms.
For applications where air from the structure
is used to supply combustion air for the unit, the
following openings are required:
1. Have a total free section of a least 25 mm2every
kW (1 in2for every 1000 Btu/hr) of heat input, with
a minimum of 100 cm2(15.5 in2);
2. Where required by code or when required for
additional opening must be provided at the highest
practical elevation.
With a hermetically sealed combustion chamber
and air supply circuit from outdoors, the water
heater may be installed in any room in the
home. Keep water heater area clear and free
from combustible materials, gasoline and other
flammable vapors and liquids.
WARNING
If the temperature in the water heaters
installation location goes below 35.6°F (2°C) ,
insert an electrical resistances kit .
1.1.3. REFERENCE LEGISLATION
This water heater must be installed in accordance
with local codes, if any; if not, follow the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, or the
Natural Gas and Propane Installation Code, CAN/
CSA B149.1, as applicable.

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1.4. UNPACKING
WARNING
Please unpack the unit just before
installing it. The Company is not responsible for
the damages caused to the unit due to incorrect
storage.
WARNING
The packing elements (cardboard
box, wooden crate, nails, fasteners, plastic bags,
expanded polystyrene, etc.) are dangerous and
must be kept out of the reach of children. They
should be discarded properly.
To unpack the water heaters, proceed as follows:
› Place the packed water heaters 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
INSTALLATION
fig. 1

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1.5. OVERALL DIMENSIONS (inch)
HYDRAULIC CONNECTION KIT
A water connection kit equipped with water
connections and safety valve (see ‘VS’) is shipped
loose with each unit.
11.8
6.1
5.3
5.9
19
16
25.2
G
SC
2.36"
RC
1.50" 7.76"3.31"
C F
16.14"
(107mm)
(52mm)
(197mm)
(410mm)
(38mm) (84mm) (60mm)
8.31"
9.61"
(211mm)
(244mm)
2.05"
4.21"
VS
CF
INSTALLATION
(*) NOTE: THESE ARE CONNECTION
SIZES BEFORE VALVE KIT/CONNECTION
CONVERSION KIT IS INSTALLED.
fig. 2
C HOT WATER OUTLET Ø3/4” BST*
F COLD WATER INLET Ø3/4” BST*
RC GAS Ø3/4” NPT
G RECIRCULATION MODE Ø1/2” NPT
SC CONDENSATE DRAIN Ø0.8”
C HOT WATER OUTLET Ø3/4” NPT
F COLD WATER INLET Ø3/4” NPT
fig. 3

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1.6. POSITIONING AND CLEARANCES TO COMBUSTIBLE MATERIAL AND
SERVICE CLEARANCES
The water heaters must be installed only on a
vertical solid wall, able to sustain its weight.
This water heaters has been certified to be installed
with “0” clearances to combustible material.
In order to allow the access inside the water
heaters for maintenance operations, follow the
minimum service clearances indicated in figure 4.
To facilitate the installation, the water heater is
provided with a jig that allows setting in advance
the connections to the tubes providing the ablility
of connecting the water heaters to completed
masonry structure.
1.1.7. ATTACHING THE WATER HEATERS TO WALL
To position the unit, proceed as follows:
1. Trace a line using a spirit level (min. length 25 cm / 10”) on the installation wall (fig. A).
2. Mark the two points to insert the two screws (fig. B) and drill the wall (fig. C).
3. Fix the wall bracket using the screws (fig. D) provided. Hang the water heater using the attached holes (E-F).
H
B
A
Y
X
15.98"
(406mm)
15.98"
(406mm)
HOLES
FIXING
INSTALLATION
A - 7.8 inch
B - 11.8 inch
X - 2.3 inch
Y - 2.3 inch
H - 36 inch
fig. 4
fig. F
fig. A fig. B fig. C
fig. D
fig. E

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1. INSTALLATION
INSTALLER
4. To make it easier the outlet of the condensate, the water heaters, once it is hung onto the wall, must
have the right slope. Please use the lower wall bracket (fig.5);
5. Unscrew the lower bracket screws from the bottom of the water heater. Place the lower bracket
into position and loosely screw the lower bracket (fig. 5). Slide the lower bracket (fig. 6) in order to
separate the water heater from the wall from 2-3° (fig. 7).
6. Perform the connections.
2 - 3°
LOWER WALL
BRACKET
LOWER WALL
BRACKET
LOWER WALL
BRACKET
fig. 5
fig. 6
fig. 7

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1.8. CIRCULATOR PERFORMANCE CURVE
III
Circulator priority maximum speed
- - - - Appliance Loss
H (ft)
Q (US gpm)
0 2 4 6 8 10
22
20
18
16
14
12
10
8
6
4
2
0
WILO STAR 8 BS7
INSTALLATION
HEAD LOSS ft W.C.
FLOW RATE US gpm
fig. 8

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1.9. WATER CONNECTION
DANGER
Make sure that the water tubes 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
heaters, please wash the unit (if possible when
hot) with suitable descaling solution to remove the
impurities coming from tubes.
WARNING
When connecting the equipment to
water supply, avoid excessive bending and recovery
operations from improper positioning that may
damage the tubes causing leaks, malfunction or
premature 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.
DOMESTIC CIRCUIT
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 °dH. However, please check the
characteristics of the water used and install
suitable treating devices.
The pressure of the cold inlet water should be
between 7.2 psi (0.5 bar) and 150 psi (10.34 bar).
In case of greater pressure values, please install
a pressure reducer upstream from the water
heaters.
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 recently
installed units. Based on the characteristics of
the inlet water, you should install suitable water
treatment devices, for residues presence please
install an inline filter.
INSTALLATION

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SFK 55 - RAD - ING - Manual - 1512.2_CSA_TTS
1. INSTALLATION
INSTALLER
1.1.10. RECIRCULATION MODE
The tankless water heaters has a built in
recirculation system a circulating pump which
is designed to provide a controlled flow rate of
domestic hot water thus reducing wait times and
water waste.
To activate the recirculation mode, please proceed
as follows:
› Turn the three-way-valve to the “recirculation”
position, as shown in figure 9.
› Activate the recirculation mode by
simultaneously pressing the ‘ ’and ‘
’ buttons of the control panel (figure 10). The
activation of the recirculation mode is displayed
on the control panel as indicated by the ‘ ’
symbol.
› Adjust the setting of the return temperature by
pressing ‘ ’and ‘’ (figure 11). The activation
of the pump is displayed the control panel as
indicated by the pump symbol ‘ ’.
To detect the return temperature, the system
activates the pump for 20 seconds every 10
minutes.
If the temperature detected, by the recirculation
sensor, is lower than required, the pump activates
and the unit operates at the minimum fire rating.
When the required temperature is achieved, the
unit 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 127 °F (53 °C). When this temperature
is achieved, the appliance shuts-off while the
pump keeps running. The appliance is activated
again when the temperature falls to 122 °F (50 °C).
RC
INSTALLATION
fig. 9
fig. 10
fig. 11

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1. INSTALLATION
INSTALLER
1.1.11. PIPING DIAGRAM FOR BASIC INSTALLATION
This is not an engineering drawing. It is intended only as a guide and not as a replacement for professionally
engineering project drawings.
This drawing is not intended to describe a complete system. It is up to the contractor / engineer to
determine the necessary components and configuration of the particular system being installed.
(PUMP PROVIDED INSIDE)
INSTALLATION
fig. 12

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1. INSTALLATION
INSTALLER
INSTALLATION
1.1.12. CONDENSATE DRAIN
FILLING THE CONDENSATE COLLECTION SIPON
Before starting the water heaters you have to fill
the condensate collection siphon in order to avoid
fuel backup through the siphon.
Fill the condensate collection siphon as follows
(see fig. 13):
› Unscrew the “T” cap from the siphon, fill three
quarters of the the siphon with water and screw
the “T” cap back in;
› Connect the dedicated flexible condensate drain
tube “P” to a waste disposal system.
WARNING
After the first months of water heaters
operation, it is recommended to clean the
condensate trap, to eliminate possible deposits
coming from the first flow of the condensate inside
the water heaters technical components. These
deposits could cause a malfunctioning of the trap.
CONDENSATE DRAIN
The water heaters produces a significant amount
of condensate during operation. This condensation
has an acidic pH of 3-5. Follow all local codes and
regulations when disposing of condensate from
the water heaters.
The project engineer should consider the
possibility of installing systems to eliminate the
acidic condensation, according to system power
and buildings’ use.
The system should be designed to avoid the
condensate freezing. Before the water heaters
commissioning, check the correct condensate
flow.
WARNING
Check before connecting the condensate
trap to the drain pipe, for the proper
gradient of water heaters as described in paragraphs
“1.1.8 ATTACHING THE WATER HEATERS T O W A L L” .
WARNING
Properly connect the siphon condensate
from the water heaters to a drain system having
adequate slope. Where possible, you should
make this connection using transparent tubing to
check for proper condensate drainage and avoid
stagnation that could cause hazardous backflow of
the condensate into the water heaters.
To connect the condensate drain use only
corrosion-resistant material for the drain line.
P
T
fig. 13

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1. INSTALLATION
INSTALLER
CONDENSATE NEUTRALIZER KIT
The condensate neutralization system neutralizes
the condensate created by the products of
combustion.
Acid condensate, introduced into the neutralization
box, follows a two-step set course. First phase:
nitrates and sulphates filtration through active
carbons contained in the first part of the carbon
site pipe. In the second phase the pH rises.
The acidity of the condensate can be controlled
through the use of appropriate tools for the
determination of Ph, such as the litmus paper.
Neutralized condensate can then be routed to the
drainage system.
Maintenance
The pH value of the condensate after the neutralizer
must be in between <5,5 – 9,5> .
Every six months, you need to determine the pH of
the condensate treated in the neutralizer. Litmus
paper or a digital instrument can be used to
measure the pH level.
Neutral point is on the 6,8-7 value; in case of lower
value the condensate is acid, in case of a higher
value it is basic.
If necesssary, replace the active carbon and the
reagent granulate.

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1. INSTALLATION
INSTALLER
1.1.13. ANTI-FREEZE PROTECTION
The water heater is protected against freezing
using the electronic board design with a function
that start the burner and heat the water in the
boiler when their water temperature goes below
the minimum pre-set values, protecting the water
heater up to an external temperature of 14 °F (-10
°C).
The device starts when the hot water temperature
goes below 41 °F (5 °C), automatically starting the
burner until the water reaches the temperature of
59 °F (15 °C).
The system starts even if display appears “OFF”,
as long as the water heater is connected to the
power (120 V) and gas supply.
For long periods of standby, please empty the
water heater and the plant.
If the temperature goes below 14 °F (-10
°C) centigrades, please insert the electrical
resistances kit (cod. 82259LP).
INSTALLATION