RBI infinite energy 2 Guide

UMIE2-1
82-0148
User’s
Information
Manual
Read all instructions thoroughly,
and perform regular maintenance
and service as directed. Keep this
manual on or near the boiler.
This manual is intended only for use by a qualified heating installer/technician. Read and follow this manual, all supplements and
related instructional information provided with the boiler. Install, start and service the boiler only in the sequence and methods
given in these instructions. Failure to do so can result in severe personal injury, death or substantial property damage.
Do not use the boiler during construction. Construction dust and particulate, particularly drywall dust, will cause contamination
of the burner, resulting in possible severe personal injury, death or substantial property damage. The boiler can only be operated with
a dust-free air supply. Follow the instruction manual procedures to duct air to the boiler air intake. If the boiler has been contaminated
by operation with contaminated air, follow the instruction manual guidelines to clean, repair or replace the boiler if necessary.
Affix these instructions near to the boiler. Instruct the building owner to retain the instructions for future use by a qualified service
technician, and to follow all guidelines in the User’s Information Manual.
Condensing,
High Efficiency
Water Heaters (IW)
and Boilers (IB)
62417021 R00 Feb. 18, 2014

2
SAFETY INSTRUCTIONS
- 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
a neighbor’s 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.
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.

3

4
- Ne pas entreposer ni utiliser d’essence
ou ni d’autres vapeurs ou liquides
inflammables à proximité de cette appareil
ou de tout autre appareil.
- QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
• Ne pas tenter d’allumer l’appareil.
• Ne touchez à aucun interrupteur, ne
pas vous servir des téléphones se
trouvant dans le bâtiment
• Appelez immédiatement votre
fournisseur de gas de puis un voisin.
Suivez les instructions du fournisseur.
• Si vous ne pouvez rejoindre le
fournisseur, appelez le service des
incendies
- L’installation et l’entretien doivent être
assurés par un installateur ou un service
d’entretien qualifié ou par le fournisseur
de gaz.
AVERTISSMENT: Assurez vous de bien
suivre les instructions données dans
cette notice pour réduire au minimum
le risque d’incendie ou d’explosion ou
pour éviter tout dommage matériel, toute
blessure ou la mort
Un temperature de l’eau au dessus de
125°F (52°C), peut causer de graves
brulures instantanément, ou la mort par
échaudure.
Les enfants, les personnes handicapées
ou âgées sont plus à risque d’être
échaudées
Voir le manuel d’instruction avant de
régler la température de l’eau sanitaire
Sentir la temperature de l’eau sanitaire
avant un bain ou une douche
Limiteurs de temperature sont disponible,
voir le manuel
121110m0_d
Chaude

5
SAFETY INSTRUCTIONS

6
SAFETY INSTRUCTIONS
could result in excessive levels
of carbon monoxide which can
cause severe personal injury or
death!
WARNING!!!
Flue gas/air
intake: Do not obstruct the air
intake or vent pipe terminals.
Failure to take proper precautions
can result in excessive levels
of carbon monoxide which can
cause severe personal injury or
death!
WARNING!!!
Flue gas/air
intake terminals: Do not restrict
or seal any air intake or outlet
openings (terminals). Failure to
follow these instructions could
result in excessive levels of
carbon monoxide which can
cause severe personal injury or
death!
WARNING!!!
Hazards and
Your Safety - Hot Water Can
Scald! Water temperature over
125°F (51°C) can cause severe
burns instantly, or death from
scalds. Children, the disabled,
and the elderly are at highest
risk of being scalded; see
instruction manual before setting
temperature at heater! Feel water
before bathing or showering.
CAUTION!!!
In the event of a
breakdown and/or malfunction
of the heater, turn off the unit
and do not make any attempt
to repair it. The heater must
be serviced exclusively by a
Qualified installer using original
spare parts. Failure to comply
with this requirement may
compromise the safety of the
unit.
WARNING!!!
Maintenance: at least once a
year the user must call a
Qualified installer for routine
maintenance.
Failure to comply with these
provisions can cause a fire or
explosion causing property
damage, personal injury, or
death.
WARNING!!!
If the
information in this manual is
not followed exactly, can result
in a fire or explosion causing
property damage, personal
injury, or death.
WARNING!!!
Qualified
installer: qualified installer is
an individual with specific,
technical training in space
heating systems, domestic hot
water systems, fuel gas systems
and electrical systems. This
individual must have the legally
required qualifications. Failure
to comply with these provisions
can cause a fire or explosion
causing property damage,
personal injury, or death.
WARNING!!!
Installation
and Alterations: Only a Qualified
installer must carry out the
installation and calibration of
the heater. Never modify the
heater or its flue gas carrying
components in any way.
This heater must be properly
vented. Failure to follow these
instructions could result in
personal injury or death!
WARNING!!!
Flue gas/air
intake: You are only permitted
to operate this appliance with
the combustion air/flue gas
system that has been specifically
designed and approved. Failure
to follow these instructions
WARNING!!!
When
servicing heater, to avoid
electric shock, disconnect
electrical supply before
performing maintenance.
Failure to do so can cause
severe personal injury or death.
WARNING!!!
When
servicing heater, to avoid severe
burns, allow heater to cool
before performing maintenance.
Failure to do so can cause
severe personal injury or death.
WARNING!!!
Should
overheating occur or the gas
supply fail to shut off, do not
turn off or disconnect electrical
supply to circulator. Instead,
turn off the manual gas shut-off
valve external to the appliance.
Failure to follow these
instructions could result in fire
or explosion which can cause
severe personal injury or death!
WARNING!!!
ATTENTION!!!
En cas de
surchauffe ou si l’alimentation
de gaz ne peut être coupée,
ne pas couper ni débranch
l’alimentation électrique de la
pompe. Fermer plutôt le robinet
d’admission de gaz à l’extérieur
de l’appareil

7
SAFETY INSTRUCTIONS
WARNING!!!
Do not use
this appliance if any part has
been under water. Immediately
call a licensed authorized
technician to inspect the
appliance and to replace any
part of the control system and
any gas control, which has
been under water. Failure to do
so can cause severe personal
injury or death.
WARNING!!!
ATTENTION!!!
N’utilisez pas
cet appareil s’il a été plongé
dans l’eau, même partiellement.
Faites inspecter l’appareil
par un tecnicien qualifié et
remplacez toute partie du
système de contrôle et toute
commande qui ont été plongés
dans l’eau.
WARNING!!!
Ensure the
heater and its controls are
protected from dripping or
spraying water during normal
operation or service. Failure
to do so can cause severe
personal injury or death.
NOTICE! When calling or writing about
the heater – Please have the
heater model and serial number
from the heater rating plate.
NOTICE! Any claims for damage or
shortage in shipment must be
filed immediately against the
transportation company by the
consignee.
CAUTION!!!
Do not use
“homemade cures” or
“heater patent medicines”.
Serious damage to the heater,
personnel, and/or property may
result.
NOTICE! The manufacturer declines
all liability, contractual or otherwise
(warranty included), for any
damage to people, animals
property or this same appliance,
caused by:
a) - incorrect installation;
b) - failure to comply with this or any
other instruction provided by the
manufacturer;
c) - failure to comply with the applicable
local and/or national regulations in
force;
d) - incorrect use of this appliance
e) - inadequate or incorrect service
f) - inadequate or incorrect
maintenance.

8
SAFETY INSTRUCTIONS .................................................................................................................2
TABLE OF CONTENTS.....................................................................................................................8
1 - CODE REQUIREMENTS..............................................................................................................9
1.1 - Regulations and guidelines .................................................................................................................................. 9
2 - GENERAL INFORMATION.........................................................................................................10
2.1 - Key to symbols used .......................................................................................................................................... 10
2.2 - Manufactured by ................................................................................................................................................ 10
2.3 - Description of models:........................................................................................................................................ 10
3 - FUNCTION OVERVIEW .............................................................................................................11
3.1 - Intended use and functions ................................................................................................................................ 11
3.1.1 Intended use and functions of the IB boiler ................................................................................................................ 11
3.1.2 Intended use and functions of the IW water heater.................................................................................................... 11
3.2 - Efficiency up to 98% (IB boiler only) .................................................................................................................. 11
4 - INSTALLATION - Vent and combustion air .............................................................................12
4.1 - Prevent combustion air contamination ............................................................................................................... 12
5 - USE.............................................................................................................................................13
5.1 - Overview ............................................................................................................................................................ 14
5.2 - Displays.............................................................................................................................................................. 14
5.3 - Start-up procedure ............................................................................................................................................. 14
5.4 - IW supply water temperature adjustment........................................................................................................... 14
5.5 - IB - Indirect water heater temperature adjustment............................................................................................. 14
5.6 - IB - Heating temperature adjustment ................................................................................................................. 14
5.7 - Delays, alarms and protective actions ............................................................................................................... 15
5.8 - Circulator pump protection ................................................................................................................................. 15
5.9 - Freeze protection ............................................................................................................................................... 15
5.10 - Display in energy saver mode ......................................................................................................................... 15
5.11 - “Users’ menu” ................................................................................................................................................... 16
5.12 - Diagnostic ........................................................................................................................................................ 17
5.13 - Safety flue blocked pressure switch................................................................................................................. 17
5.14 - Shuts heater down ........................................................................................................................................... 17
5.15 - How to clean the appliance jacket.................................................................................................................... 17
6 - MAINTENANCE..........................................................................................................................18
6.1 - Care and maintenance....................................................................................................................................... 18
6.1.1 - Check relief valve..................................................................................................................................................... 20
6.1.2 - Check heater area.................................................................................................................................................... 20
6.1.3 - Check pressure gauge ............................................................................................................................................. 20
6.1.4 - Check vent piping..................................................................................................................................................... 20
6.1.5 - Check air piping........................................................................................................................................................ 21
6.1.6 - Check condensate drain system .............................................................................................................................. 21
6.1.7 - Check heater piping (gas and water) ....................................................................................................................... 21
6.1.8 - Shut boiler down ...................................................................................................................................................... 21
1. Follow “To Turn Off Gas to Appliance” on page 3 of this manual. ................................................................................... 21
6.1.9 - Test low water cutoff (if installed) ............................................................................................................................. 21
6.1.10 - Reset low water cut off button (If used).................................................................................................................. 21
TABLE OF CONTENTS

9
1 - CODE REQUIREMENTS
1.1 - Regulations and
guidelines
- The installation must conform to the
requirements of the authority having
jurisdiction or, in the absence of such
requirements, to:
- the latest edition of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 and or CAN/
CSA B149.1, Natural Gas and Propane
Installation Code;
- the latest edition of the National Electric
Code ANSI/NFPA 70 and or Canadian
Electrical Code Part 1 CSA C22.1.
- Where required by the authority having
jurisdiction, the installation must conform
to the Standard for Controls and Safety
Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1
NOTICE!
Install CO detectors per local regulations.
NOTICE!
IB Boiler version meets the safety and other
performance requirements as specified in
ANSI Z21.13 standard.
NOTICE!
IW Water heater version meets the safety
and other performance requirements as
specified in ANSI Z21.10.3 standard.
NOTICE!
IB boiler version: per DOE mandate, the
operator control incorporates an automatic
means (outdoor reset) of adjusting the boiler
water temperature fot hot water heating. The
boiler must not operate without the automatic
means enabled.
NOTICE!
IB boiler version: in accordance with
Section 325 (f)(3) of the energy policy and
conservation Act, this boiler is equipped with
a feature that saves energy by reducing the
boiler water temperature has the heating load
decreases.

10
2 - GENERAL INFORMATION
2.1 - Key to symbols
used
WARNING!!! Failure to follow
these indications can causing an
explosion, fire, extensive property
damage, severe personal injury or
death!
CAUTION!!! Failure to observe this
indication may compromise the
smooth running of the appliance
or cause serious damage to
individuals, animals or property.
NOTICE! Indicates special instructions on
installation, operation, or maintenance that
are important but not related to personal
injury or property damage.
Important indication symbol
2.2 - Manufactured by
RBI WATER HEATER
7555 Tranmere Drive
Mississauga, Ontario L5S 1L4 Canada
Phone: [phone]
Fax: [phone]
www.rbiwaterheaters.com
2.3 - Description of
models:
XX XXXX
199 = maximum power input 199,000 Btu/hr (57,5 kW) and minimum 50,000 Btu/hr (14,7 kW).
399 = maximum power input 399,000 Btu/hr (117 kW) and minimum 50,000 Btu/hr (14,7 kW).
500 = maximum power input 500,000 Btu/hr (146,5 kW) and minimum 50,000 Btu/hr (14,7 kW).
750 = maximum power input 750,000 Btu/hr (220 kW) and minimum 50,000 Btu/hr (14,7 kW).
1000 = maximum power input 999,000 Btu/hr (292,8 kW) and minimum 50,000 Btu/hr (14,7
kW).
IB = Tankless fully modulating, gas-fired, condensing hot water boiler
IW = Tankless fully modulating, gas-fired, condensing potable water heater

11
3 - FUNCTION OVERVIEW
Figure 3-1 Outdoor reset control to optimize the efficiency
to 98% (IB boiler
only)
Section applicable to boiler version only.
When the outdoor reset is activated (an
outside sensor is connected), the boiler
always work at the maximum efficiency.
It will automatically change the supply
temperature in relation with the outdoor
temperature (Outdoor reset).
The graph in Figure 3-1 shows an
example on how it can work.
This graph represents an installation
where the supply and return
temperatures are 139°F (60°C) and
115°F (46°C) respectively , and the
outside temperature is 23°F (-5°C).
The outdoor reset drives the boiler,
to progressively reduce the supply
temperature and thereby optimize the
efficiency. It changes from 87% when
outside is -10°F (-23°C), to 94.8% when
outside is 23°F (-5°C) and up to 98%
when the outside temperature rises up
to 67°F (20°C).
3.1 - Intended use
and functions
3.1.1 Intended use and
functions of the IB boiler
The boiler version, is designed to be
used for central heating system for civil
uses. Any other use is prohibited.
The maximum output heat is always
guaranteed for the production of
domestic hot water since it is given
priority over space heating demands.
The boiler version can be connected
to an indirect storage tank for the
production of domestic hot water.
The boiler version can also function
directly with a radiant floor panel.
3.1.2 Intended use and
functions of the IW water
heater
The water heater version, is designed
to warm domestic water (potable) for
civil uses. Any other use is prohibited.
This water heater must be connected
to a storage water heater for the
production of domestic hot water.
3.2 - Efficiency up

12
4 - INSTALLATION - Vent and combustion air
4.1 - Prevent
combustion air
contamination
Do not terminate vent/air in locations
that can allow contamination of
combustion air.
WARNING!!! Contaminate
combustion air will damage
the boiler, resulting in possible
severe personal injury, death or
substantial property damage.
Ensure that the combustion air
will not contain any of the follow
contaminants.
Products that may contaminated the
air combustion:
- Permanent wave solutions;
- Chlorinated waxes/cleaners;
- Chlorine-based swimming pool
chemicals;
- Calcium chloride used for thawing;
- Sodium chloride used for water
softening;
- Refrigerant leaks;
- Paint or varnish removers;
- Hydrochloric acid/muriatic acid;
- Cements and glues;
- Antistatic fabric softeners used in
clothes dryers;
- Chlorine-type bleaches, detergents,
and cleaning solvents found in
household laundry rooms;
- Adhesives used to fasten building
products and other similar products;
Do not pipe combustion air near
sources of products that may
contaminate the air combustion, like:
-Dry cleaning/laundry areas and
establishments;
- Swimming pools;
- Metal fabrication plants;
- Beauty shops;
- Refrigeration repair shops;
- Photo processing plants;
- Auto body shops;
- Plastic manufacturing plants;
- Furniture refinishing areas and
establishments;
- Remodeling areas;
- Garages with workshops.

13
Figure 5-1 Instrument panel
5 - USE
T
020010.01.023
A- Key to reduce the supply water temperature;
B - Multifunctional key: reset any lockouts; access to user and installer menu.
C - Key to increase the supply water temperature;
D - Flame icon, is present when the flame is present;
E - Radiator icon. Present when heater is enabled to work. Blinking when heater working;
F - Faucet icon. Present when an indirect water heater (coil water heater) is enabled. Blinking when an indirect water heater (coil water
heater) is loading;
H - Unit of measure of the water system pressure
L- Burner unit indicators: Light when burner is burning; blinking when burner is in lockout or in blocking error
= Burner 1 (master)
= Burner 2
= Burner 3
= Burner 4
M - Water pressure gauge and indicator of the parameters
G - Icon indicating access to the installer menu
N - Supply water temperature gauge and indicator of the parameters value
O - Unit of measure of the temperature
P - Icon displayed when the outdoor sensor is active
R - Multifunctional key: increase the indirect water heater (coil water heater) temperature; scroll the parameters; increase the parameters’ value;
S - Multifunctional key: decrease the indirect water heater (coil water heater) temperature; scroll the parameters; decrease the parameters’ value;
T - On-Off Main power switch

14
5.1 - Overview
The heater is pre-set with standard
parameters. It is possible to consult
the parameters by means of using the
“Users’ Menu” (see Section 5.11).
During functioning display “N” of
Figure 5-1, displays the supply
temperature and display “M” (see
Figure 5-1) shows the pressure of the
heating system. The various operating
statuses are shown with other icons
as per Figure 5-1.
5.2 - Displays
During normal operations, the
display remain permanently off,
except appliance go in Lockout, or in
Blocking error.
In any case, pressing any key, display
will light on and will stay light on for 5
minutes from the last pressing key.
5.3 - Start-up
procedure
1. Open the manual gas shutoff valve;
2. switch on electric power to the
heater;
3. If the display shows code Err 65,
it means that the polarity has
not been observed (Call service
department to restore the situation,
do not attempt to repair it);
4. press key or to
setup the supply temperature
desired, then press RESET key to
save the changement.
5. press key and
to setup the indirect water heater
desired temperature, then
press RESET key to save the
changement.
The flame control appliance will start-
up the burner.
If the burner fails to ignite within 60
seconds, the heater will automatically
attempt ignition another four times,
after which if it fails to start-up, it will
shut down and the display will show
Loc 1 together icon .
Units models 399 up to 1000,
because are multiburner, when the
they go into any lockout or blocking
error display will show the icon
and the corresponding burner icon in
fail (  or ) that blink.
Press the RESET key in order to re-
set normal operating conditions.
On units model 399 up to 1000,
to restore the normal operating
condition, press RESET key one time,
diplay will show the type of lockout,
than press again RESET key (to back
in normal display mode, press and
hold for at least 5 seconds RESET
key).
The heater will automatically attempt
another start-up.
CAUTION!!! If the appliance
frequently shuts down, contact
a qualified technician to restore
normal running conditions. Do
not attempt to repair it.
5.4 - IW supply
water temperature
adjustment
The water heater provides hot water at
the temperature set by adjusting keys
or as shown in Figure
14-1.
When the keys are pressed, the display,
item “N” in Figure 5-1, shows the supply
water setpoint being selected. The
range within which the water can be set
is 68°F (20°C) to 176°F (80°C).
WARNING!!!
Water
temperature over 125°F (51°C)
can cause severe burns instantly
or death from scalds. Children,
disabled and elderly are at
highest risk of being scalded.
Feel water before bathing or
showering.
5.5 - IB - Indirect
water heater
temperature
adjustment
If the heater is installed to perform
double service (heating and domestic
hot water by an indirect water heater),
to control the indirect water heater
temperature you have to use keys
and . When the keys
are pressed, the display, item “N” in
Figure 5-1, shows the indirect water
heater setpoint being selected. The
range within which the indirect water
heater can be set is 104°F (40°C) to
140°F (60°C).
WARNING!!!
Water
temperature over 125°F (51°C)
can cause severe burns instantly
or death from scalds. Children,
disabled and elderly are at
highest risk of being scalded.
Feel water before bathing or
showering.
5.6 - IB - Heating
temperature
adjustment
The boiler supply hot water at the
temperature set by adjusting keys
or as shown in Figure
5-1. The room thermostat turns the
circulator pumps on in order to satisfy
the heat demand of the rooms controlled
by the thermostat. To maximize the
heaters’ performance, the heating
temperature, should be set at a value
that is just sufficient to maintain the
desired temperature of the rooms. As
the weather gets colder, progressively
increase the heating water temperature
by key . When the weather gets
milder turn the water temperature down.
5 - USE

15
Once the heater has reached a
temperature of 50 °F (10 °C), the
heating pump will automatically
comes on. If the temperature falls
below 41 °F (5 °C), the burner will
light to prevent the heater from
freezing.
5.10 - Display in
energy saver mode
The display, in Figure 5-1, is switched
off each time no key is touched for at
least 5 minutes, with the exception of
when it displays errors or settings.
5 - USE
5.7 - Delays, alarms
and protective
actions
To protect the life of the appliance,
improve comfort, and maximize energy
savings, the following timings have
been incorporated into the control
logic:
a - Pump delay: each time the room
thermostat is satisfied, the circulator
pump continues to run for 4 minutes;
b - DHW delay: each time the domestic
hot water demand is satisfied, a 4
minutes delay must pass before the
end of the service;
e - Time delay in restarting the burner:
in its normal functioning state, every
time the burner stops, there is a
delay time of 3 minutes before the
boiler restarts again.
5.8 - Circulator
pump protection
During the summer months, the
circulators pumps are run once a day
for around 15 seconds to prevent it
from seizing.
5.9 - Freeze
protection
CAUTION!!!
For the freeze
protection function to work, the
heater must remain connected
to the electrical and gas
supplies with DHW and central
heating service switched to OFF
CAUTION!!! This freeze
protection function is
conceived to protect the heater
only, not the heating system.
CAUTION!!! Because the
heater’s freeze protection
function depends from the
electrical supply and from the
gas supply, it is mandatory
install a safety device that
alarm the user in a case the
heater room will reach a
temperature near 35°F (2°C)

16
5.11 - “Users’
menu”
Pressing RESET key for 2 seconds,
you will enter the “Users’ menu”.
When entering the “Users’ menu”, the
display, item “M” in Figure 5-1, will
5 - USE
start showing parameters from 1000.
Press keys and you
can scroll all parameters inside this
menu. All parameters into this “Users’
menu” can be consulted but not
changed.
For unit models 399 up to 1000
parameters adressed to “Burner 1”
are applicable for that burner only.
Parameter Parameter’s description Units
1001 Burner 1 supply temperature °F
1002 Indirect water heater temperature °F
1004 Outdoor sensor temperature °F
1006 Burner 1 Flue gas temperature °F
1007 Burner 1 Return temperature °F
1008 Burner 1 Ionisation current μA (micro ampere)
1009 State of the Local pump (and of the Burner 1 Motorized valve) ON/OFF
1010 State of the CH pump ON/OFF
1011 State of the DHW pump ON/OFF
1012 Calculated CH setpoint (when outdoor sensor is activated) (only for 199
model; for 399, 500, 750 and 1000 models see Parameter 1107)
°F
1040 Burner 1 Actual Fan speed rpm/min
1041 Burner 1 Ignition fan speed rpm/min
1042 Burner 1 Low power fan speed rpm/min
1043 Burner 1 High power fan speed rpm/min
1051 Burner 1 Last lockout number \
1052 Burner 1 Last Blocking error \
1053 Burner 1 Number of flame failures no
1055 Burner 1 Number of failed ignitions no
1056 Burner 1 Total hours of operation Hr x 10
1057 Burner 1 Total hours of operation or the indirect water heater Hr x 10
1059 **Burner 1 Interval between Lockouts. May be: 1:MIN; 2:HRS; 3:DAY; 4:WK
1060 **Burner 1 Interval between Blocking errors. May be: 1:MIN; 2:HRS; 3:DAY; 4:WK
1062 Burner 1 Water flow GPM
1101 MULTIBURNER: number of burners ON n
1102 MULTIBURNER: header temperature °F
1103 MULTIBURNER: any Burner into Lockout /
1104 MULTIBURNER: any Burner into Blocking Error /
1106 MULTIBURNER: system is in emergency mode /
1107 MULTIBURNER: current multiburner setpoint °F
1120 MULTIBURNER: burner 1 modulating level %
1121 MULTIBURNER: burner 2 modulating level %
1122 MULTIBURNER: burner 3 modulating level %
1123 MULTIBURNER: burner 4 modulating level %
** How to read the timer value:
Eg: If it shows 1:29, it means 29 minutes;
Eg: If it shows 2:12, it means 12 hours;
Eg: If it shows 3:15, it means 15 days;
Eg: If it shows 4:26, it means 26 weeks;

17
5 - USE
5.12 - Diagnostic
During normal operation display can show the below
informations:
5.13 - Safety flue
blocked pressure
switch
This appliance is equipped with a
safety flue blocked pressure switch
that shut-off the unit when the flue
exhaust vent pipe is blocked. If this
pressure switch shuts off the unit (Loc
5 or Loc 25), do not attempt to place
the heater in operation but contact a
qualified service agency.
To reset the blocked vent shut off
system, call a qualified service agency
that will reset the unit after checking
for any potential dangerous situation.
WARNING!!! If the safety
flue blocked pressure switch shuts
off the system do not attempt
to reset or repair the unit. It is
mandatory to contact an Qualified
service agency. Failure to comply
with this requirement can result
in excessive levels of carbon
monoxide which can result in
severe personal injury or death!
5.14 - Shuts heater
down
1. Follow “To Turn Off Gas to
Appliance” on page 3 of this
manual.
2. Do not drain the system unless
exposure to freezing temperatures
will occur.
3. Do not drain the system if it is filled
with an antifreeze solution.
5.15 - How to clean
the appliance
jacket
To clean the appliance jacket, use only
a soft cloth dampened with water. Do
not use aggressive or abrasive agents.
Parameter Parameter description Visualization on display “N” (see Figure 5-1)
AFro Heater is doing antifreezing protection Supply temperature (°F)
Light fixed = Indirect water heater enabled
Blinking = indirect water heater loading Supply temperature (°F)
Light fixed = Hot water supply enabled
Blinking = Hot water supply active Supply temperature (°F)
Loc Heater is in Lockout. Press RESET button to unlock the burner.
If lockout happens frequently, ask for a qualified technical
service Lock out code
Err Heater is in blocking error. It is possible to restore the normal
operating conditions only resolving the problem.Ask for a
qualified technical service. Blocking error code

18
6 - MAINTENANCE
6.1 - Care and
maintenance
This section must be brought to the
attention of the user by the installer so
that the user can make the necessary
arrangements with a qualified service
agency for the periodic care and
maintenance of the boiler. User must
check its boiler follow Table 6-1 column
“User maintenance”.
The installer must also inform the
user that the lack of proper care and
maintenance of this boiler and any
fuel burning equipment may result in a
hazardous condition.
Installer should discuss contents of this
user’s manual with the user.
A trained and qualified service
technician should perform the inspection
listed in these instructions before each
heating season and at regular intervals.
WARNING!!!
Servicing,
inspection and adjustment
must be done by a trained
technician in accordance with
all applicable local and national
codes. Improper servicing or
adjustment could damage the
boiler! Failure to comply with
this warning can result in a fire
or explosion causing property
damage, personal injury or loss
of life!
WARNING!!!
Never store
combustible materials, gasoline
or any product containing
flammable vapors and liquids
in the vicinity of the heater.
Failure to comply with this
warning can result in extensive
property damage, severe
personal injury or death!
WARNING!!!
Never
obstruct the flow of combustion
and ventilation air. Failure to
provide adequate combustion
air for this heater can result
in excessive levels of carbon
monoxide which can result in
severe personal injury or death!
WARNING!!!
Before
performing any maintenance
operations, shut the boiler off,
close the manual gas shut-off
valve and shut off electrical
power to the heater. Follow the
Operating Instructions outlined
in the section “SAFETY
INSTRUCTIONS” (Beginning of
the manual).

19
Service and maintenance schedules
Service Technician User maintenance
Annual Startup:
-Address reported problems;
- Check all piping for gas leaks;
- Verify flue and air lines in good condition and sealed tight;
- Check system water pressure/system piping/expansion tank;
- Check control settings;
- Check ignition and flame sense electrodes;
- Check wiring and connections;
- Perform start up checkout and performance verification;
- Flame inspection;
- Check flame signal;
- Inspect combustion chamber. Clean and vacuum if necessary.
Clean the heat exchanger if the flue temperature is 63°F
(35°C) above return water temperature;
- Clean condensate reservoir and fill with fresh water;
- Clean air filter;
- Check the capacity input;
- Check relief valve;
Daily:
- Check heater area (Follow section 6.1.2);
- Check pressure gauge (Follow section 6.1.3);
Monthly:
- Check vent piping and vent termination screen (Follow section
6.1.4);
- Check air piping and air termination screen (Follow section
6.1.5);
- Check relief valve (Follow section 6.1.1)
- Check condensate drain system (Follow section 6.1.6);
- Check any air vents on the system that no leaks are present
Periodically:
- Test low wate cut-off (if used) (Follow section 6.1.9);
- Reset low water cut-off button (if used) (Follow section 6.1.10)
Every six month:
- Check heater piping (gas and water) for leaks (Follow section
6.1.7);
End of season months:
- Shut boiler down (unless boiler used for domestic hot water)
(Follow section 6.1.8);
Table 6-1 - Service and Maintenance Schedules

20
away from contaminated areas.
1. Combustible/flammable materials --
Do not store combustible materials,
gasoline or any other flammable
vapors or liquids near the boiler.
Remove immediately if found.
2. Air contaminants -- Products
containing chlorine or fluorine,
if allowed to contaminate the
heater intake air, will cause acidic
condensate in the heater. This
will cause significant damage to
the heater if allowed to continue.
Read the list of potential materials
listed in Section 4.1. If any of these
products are in the room from which
the heater takes its combustion air,
they must be removed immediately
or the heater combustion air (and
vent termination) must be relocated
to another area.
6.1.3 - Check pressure
gauge
1. Make sure the pressure reading on
the heater pressure gauge (item “M”
of Figure 5-1) does not exceed the
maximum working pressure. Higher
pressure may indicate a problem
with the expansion tank.
2. Contact a qualified service
technician if problem persists.
6.1.4 - Check vent piping
1. Visually inspect the vent outlet
termination to be sure it is
unobstructed. Visually inspect the
entire length of the flue gas vent
piping for any signs of blockage,
leakage, or deterioration of the
piping. Notify your qualified service
technician at once if you find any
problems.
WARNING!!!
Failure
to inspect the vent system
as noted above and have it
repaired by a qualified service
technician can result in vent
system failure, causing severe
personal injury or death.
6.1.1 - Check relief valve
Inspect the relief valve and lift the
lever to verify flow. Before operating
any relief valve, ensure that it is piped
with its discharge in a safe area to
avoid severe scald potential. Relief
valve should be re-inspected at least
once every three years, by a licensed
plumbing contractor or authorized
inspection agency, to ensure that
the product has not been affected
by corrosive water conditions and to
ensure that the valve and discharge
line have not been altered or tampered
with illegally.
Certain naturally occurring conditions
may corrode the valve or its
components over time, rendering the
valve inoperative. Such conditions are
not detectable unless the valve and its
components are physically removed
and inspected. This inspection must
only be conducted by a plumbing
contractor or authorized inspection
agency – not by the user.
WARNING!!!
Failure to
re-inspect the relief valve as
directed could result in unsafe
pressure buildup, which can
result in severe personal injury,
death, or substantial property
damage.
6.1.2 - Check heater area
WARNING!!!
To prevent
potential of severe personal
injury, death, or substantial
property damage, eliminate
all materials discussed below
from the heater vicinity and
the vicinity of the heater
combustion air inlet.
If contaminants are found:
Remove products immediately
from the area. If they have
been there for an extended
period, call a qualified service
technician to inspect the
heater for possible damage
from acid corrosion.
If products cannot be removed,
immediately call a qualified
service technician to re-pipe
vent and air piping and locate
vent termination/air intake
6 - MAINTENANCE