Fondital GIAVA KRB 12 Manual

IST 03 C 629 - 03
INSTALLATION, USE AND MAINTENANCE
GIAVA
KRB 12 - 24 - 28 - 32
EN

2
Dear Sirs,
Thank You for choosing and buying one of our boilers. Please read these instructions carefully in order to properly install, operate, and
maintain the equipment.
We inform users that:
• boilers shall be installed by an authorised company in full compliance with the prevailing standards;
• the installing company is required by law to issue a declaration of conformity with the current Standards
concerning the performed installation;
• anyone entrusting installation to an unqualied installer will be subject to administrative sanctions;
• boilers can be maintained by authorised personnel only, under the requirements set forth by the prevailing rules.

3
General notes for installing and maintenance technicians, and users
This instruction manual is an integral and essential part of the product. It shall be supplied by the installer to the user who shall keep it carefully to
consult it whenever necessary.
This document shall be supplied together with the equipment in case the latter is sold or transferred to others.
This equipment has been manufactured to be connected to a room heating system and to a DHW distribution system.
Any other use shall be considered unsuitable and dangerous for people, animals, and/or property.
The equipment shall be installed in compliance with the prevailing standards and in accordance with the manufacturer's instructions specied
in this manual: the manufacturer will not be held responsible for injuries to people and animals and/or damages to property resulting from an
incorrect installation.
Damage and/or injury caused by incorrect installation or use and/or damage and/or injury due to non-observance of the manufacturer’s
instructions shall release the manufacturer from any and all contractual and extra-contractual liability.
Before installing the boiler, check that the technical data correspond to the requirements for its correct use in the system.
Check that the boiler is intact and it has not been damaged during transport and handling. Do not install equipment which is clearly damaged and/or faulty.
Do not obstruct the air intake openings.
Only original accessories or optional kits (including the electric ones) are to be installed.
Properly dispose of the packaging as all the materials can be recycled. The packaging must therefore be sent to specic waste management sites.
The packages can be dangerous: keep them out of the reach of children.
In the event of failure and/or faulty functioning, switch o the boiler. Do not attempt to make repairs: contact qualied technicians.
Original parts must be used for all repairs to the boiler.
Non-observance of the above requirements may aect the safety of the boilers and endanger people, animals and/or property.
Routine boiler maintenance should be performed according to the schedule in the relevant section of this manual.
Appropriate maintenance will keep the boiler working in optimum conditions, ensuring environmental protection and total
safety for persons, animals and/or property.
Incorrect and irregular maintenance can be a source of danger for people, animals and property.
The user is strongly advised to have the boiler serviced and repaired by a qualied Service Centre.
In the event of long periods of inactivity of the boiler, disconnect it from the electrical power mains and close the gas cock.
Warning: Should power mains be disconnected, boiler electronic freeze protection function will not be operative.
Should there be a risk of freezing, add anti-freeze: it is not advisable to drain the system as this may result in damage; use specic anti-freeze
products suitable for multi-metal heating systems.
With gas red boilers, take the following measures if you smell gas:
- do not turn on or o electric switches and do not turn on electric appliances;
- do not ignite ames and do not smoke;
- close the main gas cock;
- open doors and windows;
- contact a Service Centre, a qualied installer or the gas supply company.
Never use a ame to locate a gas leak.
The boiler is designed for installation in the countries indicated on the technical data plate: installation in any other country
may be a source of danger for people, animals and/or property.
The manufacturer will bear no contractual and tortious liability for failure to comply with all the instructions above.

4
Rapid operating instructions
The following instructions will help you to switch the boiler on quickly and regulate it for immediate use.
It is presumed that the boiler has been installed by a qualied installer, it has been commissioned and is ready to operate correctly.
If any accessories have been tted on the boiler, these instructions will not cover them. You will therefore have to refer to the full
boiler instructions as well as to the specic instructions for the accessories.
This manual contains full details of how the boiler works, and full operating and safety instructions.
1. Open the gas cock installed ahead of the boiler.
2. Turn the master switch installed ahead of the boiler ON: the boiler display (g. 1) turns on.
3. If you do not wish to activate the heating function, press the "operating mode selection" button until it will
display the symbol : only the DHW function will be enabled.
4. If you wish to activate both the heating and DHW functions, press the "operating mode selection" button until
displaying the symbol .
5. If you do not wish to activate the DHW function, press the "operating mode selection" button until displaying
the symbol : only the CH function will be enabled.
6. To set the DHW water temperature press“DHW + and -” buttons (D, g. 1). Set temperature as required.
7. To set the heating water temperature, press “CH + and -”buttons (E, g. 1). Set temperature as required.
8. Set the desired temperature on the (optional) ambient thermostat in the building.
The boiler is now ready to operate.
If the boiler shuts down, press "reset" button (F, g. 1).
If the boiler does not resume its standard operation after three attempts, contact a qualied Service Centre.

5
CONTENTS
Warnings ......................................................................................................................................................................................................page 2
General notes for installers, maintenance technicians, and users ..........................................................................................................page 3
Rapid operating instructions......................................................................................................................................................................page 4
1. Instructions for the user..........................................................................................................................................................................page 7
1.1. Control panel.....................................................................................................................................................................................................................................page 7
1.2. Interpreting BOILER STATUS from LCD DISPLAY INDICATIONS.......................................................................................................................................page 9
1.3. “Comfort” enable/disable function ........................................................................................................................................................................................... page 12
1.4. Selecting the operating mode.................................................................................................................................................................................................... page 13
1.5. Adjusting CH and DHW temperature....................................................................................................................................................................................... page 14
1.6. Time setting....................................................................................................................................................................................................................................... page 15
1.7. "Day temperature" and "night temperature" setting .........................................................................................................................................................page 16
1.8. "Manual" programme setting......................................................................................................................................................................................................page 17
1.9. "Automatic" programme setting................................................................................................................................................................................................ page 17
1.10. CH and water heater programme mode................................................................................................................................................................................page 18
1.11. Parameter display...........................................................................................................................................................................................................................page 19
1.12. Failures that cannot be reset...................................................................................................................................................................................................... page 20
1.13. Resume boiler function................................................................................................................................................................................................................ page 20
1.14. Boiler operation .............................................................................................................................................................................................................................. page 21
1.14.1. Switching on ...........................................................................................................................................................................................................................page 21
1.14.2. CH function ..............................................................................................................................................................................................................................page 21
1.14.3. DHW function..........................................................................................................................................................................................................................page 21
1.14.4. Freeze protection function .................................................................................................................................................................................................page 21
1.14.4.1. Ambient probe freeze protection function ..........................................................................................................................................................page 22
1.14.4.2. Flow freeze protection function ............................................................................................................................................................................... page 22
1.14.4.3. Water heater freeze protection function ...............................................................................................................................................................page 22
1.14.5. Pump and valve anti-shutdown function .....................................................................................................................................................................page 22
1.14.6. Operation with (optional) external probe ....................................................................................................................................................................page 22
1.14.7. Operation with (optional) Remote Control ..................................................................................................................................................................page 22
1.15. Boiler shut-down ........................................................................................................................................................................................................................... page 23
1.15.1. Burner shut-down..................................................................................................................................................................................................................page 23
1.15.2. Shut-down due to incorrect air/ue gas system draught ....................................................................................................................................... page 23
1.15.3. Shut-down due to low water pressure...........................................................................................................................................................................page 23
1.15.4. Shut-down for fan malfunction ........................................................................................................................................................................................page 24
1.15.5. Alarm due to temperature probe malfunction ........................................................................................................................................................... page 24
1.15.6. Alarm due to (optional) Remote Control connection malfunction .....................................................................................................................page 24
1.16. Maintenance ...................................................................................................................................................................................................................................page 24
1.17. Notes for the user..........................................................................................................................................................................................................................page 24
2. Technical features and dimensions ............................................................................................................................................................................................... page 25
2.1. Technical features............................................................................................................................................................................................................................ page 25
2.2. Dimensions........................................................................................................................................................................................................................................ page 27
2.3. Key components ...............................................................................................................................................................................................................................page 29
2.4. Boiler operating layout.................................................................................................................................................................................................................. page 31
2.5. Operating data .................................................................................................................................................................................................................................page 32
2.6. General characteristics ..................................................................................................................................................................................................................page 33
2.7. CH circulation pump available head ........................................................................................................................................................................................page 34
2.8. Low and high temperature circulation pump available head (V versions) ................................................................................................................page 36
2.9. Low and high temperature circulation pump available head (Z versions)................................................................................................................. page 36
3.Instructions for the installer .............................................................................................................................................................................................................page 38
3.1. Installation standards.....................................................................................................................................................................................................................page 38
3.2. Installation .........................................................................................................................................................................................................................................page 38
3.2.1. Packaging ....................................................................................................................................................................................................................................page 38
3.2.2. Choosing where to install the boiler ................................................................................................................................................................................. page 38
3.2.3. Installing the boiler.................................................................................................................................................................................................................. page 38
3.2.4. Boiler room ventilation........................................................................................................................................................................................................... page 39
3.2.5. Air intake and ue gas venting system.............................................................................................................................................................................page 39
3.2.5.1. Conguration of air intake and ue gas venting ducts: B23, B53, C13, C33, C43, C53, C83 ..................................................................page 40
3.2.5.2. Ø 100/60 mm and Ø 125/80 mm air/ue gas coaxial duct system.................................................................................................................page 40
3.2.5.3. Air intake and ue gas venting via 80 mm split pipes.........................................................................................................................................page 42
3.2.5.4. Air intake and ue gas venting via 60 mm split pipes.........................................................................................................................................page 43
3.2.6. Checking combustion eciency.........................................................................................................................................................................................page 44
3.2.6.1. Flue cleaning function.................................................................................................................................................................................................... page 44
3.2.6.2. Measurement procedure ............................................................................................................................................................................................... page 44
3.2.7. Connection to gas mains ....................................................................................................................................................................................................... page 45
3.2.8. Hydraulic connections............................................................................................................................................................................................................ page 45
3.2.9. Connection to the electrical mains ....................................................................................................................................................................................page 46
3.2.10. Selecting the operating range in CH mode..................................................................................................................................................................page 46
3.2.11. Connection to (optional) ambient thermostat ........................................................................................................................................................... page 47
3.2.12. Connection to (optional) Open Therm Remote Control .........................................................................................................................................page 47
3.2.13. Connection to the (optional) external probe and sliding temperature operation ........................................................................................ page 48
3.2.14. TSP parameters that can be set from interface or Remote Control ..................................................................................................................... page 50
3.3. Filling the system............................................................................................................................................................................................................................. page 52
3.3.1. Filling the heating system ..................................................................................................................................................................................................... page 52
3.4. Starting up the boiler..................................................................................................................................................................................................................... page 52
3.4.1. Preliminary checks ...................................................................................................................................................................................................................page 52
3.4.2. Switching on and switching o........................................................................................................................................................................................... page 52
3.5. Connection wiring diagrams....................................................................................................................................................................................................... page 53
3.6. Adaptation to other gas types and burner adjustment ...................................................................................................................................................page 59
3.6.1. Switching from METHANE to PROPANE .......................................................................................................................................................................... page 59
3.6.2. Switching from PROPANE to METHANE .......................................................................................................................................................................... page 59
3.6.3. Gas valve setting.......................................................................................................................................................................................................................page 60
3.6.3.1. Maximum heat output adjustment............................................................................................................................................................................page 60
3.6.3.2. Minimum heat output adjustment............................................................................................................................................................................. page 60

6
FIGURE INDEX
g. 1 - Control panel.....................................................................................................................................................................................................................................page 7
g. 2 - Filler cock ............................................................................................................................................................................................................................................ page 23
g. 3 - Dimensions.........................................................................................................................................................................................................................................page 27
g. 4 - Hydraulic connections (model KRB).......................................................................................................................................................................................... page 28
g. 5 - Hydraulic connections (model KRB V) ...................................................................................................................................................................................... page 28
g. 6 - Hydraulic connections (model KRB Z)...................................................................................................................................................................................... page 28
g. 7 - Key components - front view....................................................................................................................................................................................................... page 29
g. 8 - Key components - side view ........................................................................................................................................................................................................ page 30
g. 9 - Hydraulic diagram ........................................................................................................................................................................................................................... page 31
g. 10 - KRB 12 CH circulation pump available head........................................................................................................................................................................ page 34
g. 11 - KRB 24 CH circulation pump available head........................................................................................................................................................................ page 35
g. 12 - KRB 28 CH circulation pump available head........................................................................................................................................................................ page 35
g. 13 - KRB 32 CH circulation pump available head........................................................................................................................................................................ page 35
g. 14 - High-temperature CH circulation pump available head (V version)........................................................................................................................... page 36
g. 15 - Low-temperature CH circulation pump available head (V version)............................................................................................................................ page 36
g. 16 - High-temperature CH circulation pump available head (Z version)...........................................................................................................................page 36
g. 17 - Zone 1 low-temperature CH circulation pump available head (Z version) .............................................................................................................. page 37
g. 18 - Zone 2 low-temperature CH circulation pump available head (Z version) .............................................................................................................. page 37
g. 19 - Position of coaxial duct system ................................................................................................................................................................................................ page 42
g. 20 - Dimensions for coaxial duct system ....................................................................................................................................................................................... page 42
g. 21 - Position of split venting system ............................................................................................................................................................................................... page 43
g. 22 - Dimensions of split venting system........................................................................................................................................................................................ page 43
g. 23 - Venting tower.................................................................................................................................................................................................................................. page 44
g. 24 - Flue gas analysis ports ................................................................................................................................................................................................................. page 44
g. 25 - Gas connection............................................................................................................................................................................................................................... page 45
g. 26 - Connection for condensate drain............................................................................................................................................................................................ page 46
g. 27 - Thermoregulation curves ...........................................................................................................................................................................................................page 49
g. 28 - KRB wiring diagram ......................................................................................................................................................................................................................page 53
g. 29 - KRB V wiring diagram...................................................................................................................................................................................................................page 55
g. 30 - KRB Z wiring diagram................................................................................................................................................................................................................... page 57
g. 31 - Adaptation to other gas types.................................................................................................................................................................................................. page 60
g. 32 - Removing the mixer .....................................................................................................................................................................................................................page 60
g. 33 - Changing nozzles ..........................................................................................................................................................................................................................page 60
g. 34 - Fitting the mixer............................................................................................................................................................................................................................. page 60
g. 35 - Adjustment of the gas valve......................................................................................................................................................................................................page 61
TABLE INDEX
Table 1 - Boiler status - LCD indications during normal operation.............................................................................................................................................. page 9
Table 2 - Boiler status - LCD indications in the event of malfunction......................................................................................................................................... page 10
Table 3 - Displayable parameters with info button........................................................................................................................................................................... page 19
Table 4 - KRB 12 model adjustment rates ............................................................................................................................................................................................page 32
Table 5 - KRB 24 model adjustment rates ............................................................................................................................................................................................page 32
Table 6 - KRB 28 model adjustment rates ............................................................................................................................................................................................page 32
Table 7 - KRB 32 model adjustment rates ............................................................................................................................................................................................page 32
Table 8 - Technical features........................................................................................................................................................................................................................page 33
Table 9 - Combustion specications, model KRB 12 ........................................................................................................................................................................page 33
Table 10 - Combustion specications, model KRB 24 .....................................................................................................................................................................page 34
Table 11 - Combustion specications, model KRB 28 .....................................................................................................................................................................page 34
Table 12 - Combustion specications, model KRB 32 .....................................................................................................................................................................page 34
Table 13 - Burner re-ignition temperatures ......................................................................................................................................................................................... page 46
Table 14 - Limits to be set for TSP parameters and default values based on boiler type (TSP0) ...................................................................................... page 47
Table 15 - General table of parameters ................................................................................................................................................................................................. page 50
Table 16 - Relationship between temperature (°C) and nominal resistance (Ohm) of the SR heating probe .............................................................page 59
Table 17 - CO2values ...................................................................................................................................................................................................................................page 61
Table 18 - Diameter of nozzles - diaphragms ..................................................................................................................................................................................... page 61
4. Testing the boiler .....................................................................................................................................................................................page62
4.1. Preliminary checks............................................................................................................................................................................................................................page 62
4.2. Switching on and switching o................................................................................................................................................................................................... page 62
5. Maintenance.............................................................................................................................................................................................page63
5.1. Maintenance schedule....................................................................................................................................................................................................................page 63
5.2. Combustion analysis ....................................................................................................................................................................................................................... page 63
6. Troubleshooting ...................................................................................................................................................................................... page64

7
1. INSTRUCTIONS FOR THE USER
1.1. Control panel
A. Temperature selection (day/night) and recall information.
B. Weekly programme for temperature zones and manual programme selection.
C. Time and ambient temperature setting.
D. DHW water temperature setting (see paragraphs 1.3., 1.4., 1.5., 1.14.3).
E. CH water temperature setting (see paragraphs 1.4., 1.5., 1.14.2.) and parameter setting.
F. Alarm reset and back to the starting page during parameter selection.
G. DHW comfort function enabling and conrm key.
H. Operating status selection.
To gain access to the interface, touch the display area. Once active, the interface enables all the keys. 15 seconds after the last key has been
touched, the interface disables all the keys.
g. 1
A B C
D E
F G H
12
10
19
5
4
18
6
8
9
13
11
17
7
3
20
21
1
222
16
15
23
24
14

8
SYMBOL STEADY FLASHING
1Indication of "parameter" inside the parameter
menu.
2
Displaying of the number of parameters, or of
the system pressure, or of the burner power
percentage.
3Indication of the temperatures, parameter
values, faults and shut-downs.
4Boiler is working in CH mode. CH water temperature adjustment
with buttons (E, g. 1).
5Boiler is working in DHW mode. DHW temperature adjustment with
buttons (D, g. 1).
6
Display of DHW "comfort" state: wording ON =
comfort enabled;
wording OFF = comfort disabled
7Current temperature
(sun = day; moon = night)
Setting of the two temperatures
associated with the day and the night.
8Display of current time/fan revolutions.
9Indicates if the unit is in
time slot programming mode.
10 Manual mode operation. Manual mode setting.
11 Display of zone 1 CH programme. Edit zone 1 CH programme.
12 Current day of the week. Edit day of the week.
13 Display of zone 2 CH programme. Edit zone 2 CH programme.
14 Display of water heater programme Edit water heater programme
15 Night time temperature indication.
16 Daytime temperature indication. All lights ashing:
automatic mode setting.
17
Display of the
ue cleaning function and of the "rpm"
wording to show the number of revolutions
per minute of the fan.
Indicates that you are accessing the
ue cleaning function.
18
Symbols for instantaneous DHW, CH.
Symbol
ON = function enabled,
OFF = function disabled.
19
With external probe installed,
it ashes when the calculated ambient
temperature is being set through the
buttons (E, g. 1).
20 Indication of the centigrade degrees.
21 Indication of system pressure measurement unit.
22 Percentage indication.
23 During parameter editing, the wrench symbol
stays on until the set datum is conrmed.
24 Lit ame indication on the burner.

9
1.2. Interpreting BOILER STATUS from LCD DISPLAY INDICATIONS
Normal operation
Boiler switch in OFF mode
Boiler switch in SUMMER or WINTER mode or CH ONLY
No active function
The ow temperature and the heating system pressure are displayed.
Boiler switch in SUMMER or WINTER mode
Water heater enabled, DHW function active
DHW temperature displayed
Boiler switch in WINTER mode or CH ONLY
CH function active
The ow water temperature is displayed
Boiler switch in SUMMER or WINTER mode
Comfort function in progress
The ow water temperature is displayed
Table 1 - BOILER STATUS - LCD DISPLAY INDICATIONS during normal operation
WINTER
SUMMER
CENTRAL
HEATING ONLY
WINTER
CENTRAL
HEATING ONLY
WINTERSUMMER
WINTERSUMMER

10
Malfunction
No ame
Triggering of double ow probe
Triggering of ue gas thermostat
Insucient system pressure
Flow probe failure
Flue probe failure
Too high system pressure
Water heater probe failure
Return probe failure
Remote Control connection failure (only shown on Remote Control panel)
Triggering of safety thermostat in mixed zone 2
Flow probe failure in mixed zone 2
Flow probe failure in mixed zone 3
Fan failure
Communication failure between peripheral devices (zone boards)
Hydraulic conguration not allowed (wrong P03 and P18 parameter setting)
Zone conguration error (ambient probe, Remote Control and ambient
thermostat). Wrong setting of P61 parameter.
Ambient probe 1 failure
Ambient probe 2 failure
Pressure transducer failure
External probe fault with connected ambient probe (displayed if P57=2 or P57=3)

11
Communication error between main board and interface board
Shut-down due to safety circuit hardware fault
Incompatibility between boiler board and interface board
Oset error ∆T max
Flow or return probe > 120°C
Maximum ow derivative exceeded
Maximum return derivative exceeded
Flue gas temperature lower than heating return temperature
Flue gas maximum threshold exceeded
Flue gas maximum derivative exceeding alarm
Max. number of reset attempts from touch screen reached
Max. number of reset attempts from Remote Control reached (optional, if
connected)
Table 2 - BOILER STATUS - LCD indications in the event of malfunction

12
1.3. "Comfort" enable/disable function
This function keeps the water heater hot ignoring the existing water heater heating programming, if any (par. 1.10). When the "COMFORT" icon (6,
g. 1) is on, the function is enabled. When it is o the function is disabled and the boiler follows the set water heater hour programming.
If “COMFORT” function is enabled (icon “COMFORT” 6in g. 1 ON) press “COMFORT” button (G, g. 1) to disable it.
If “COMFORT” function is disabled (icon “COMFORT”, 6in g. 1 OFF) press“COMFORT” button to enable it.
The water heater heating through "COMFORT" function, or programming, is carried out only if the boiler is in SUMMER or WINTER operating mode.
If the boiler is in CH ONLY or OFF operating mode the water heater is not heated.
1. "COMFORT" FUNCTION
ENABLED
2. PRESS THE
COMFORT BUTTON
3. "COMFORT" FUNCTION
DISABLED

13
1. OPERATING STATUS
OFF
2. OPERATING STATUS
SUMMER
3. OPERATING
STATUS
WINTER
4. OPERATING
STATUS
CENTRAL HEATING ONLY
1.4. Selecting the operating mode
Whenever button is pressed, the "SUMMER” , “WINTER” , “CH ONLY” , “OFF” modes are enabled in sequence.
At this stage, all buttons are enabled.
When the "SUMMER" mode is enabled, only the DHW production function is active.
When the "CH ONLY" mode is enabled, only the heating water production function is active.
When the "WINTER" mode is enabled, both DHW and CH functions are active.
When the "OFF" mode is enabled, no function is active.

14
1. DHW TEMPERATURE
SETTING
2. CH TEMPERATURE
SETTING
1.5. Adjusting CH and DHW temperature
Press the "DHW + and -" button (D, g.1) to select the desired domestic hot water temperature (refer to paragraph 1.14.3). During selection, DHW
icon (5, g. 1) will ash. As soon as button is released, icon will continue ashing for approx. 3 seconds, and temperature value will ash as well.
After this time, value is stored and display standard operation will be restored. In the phase in which the icon is ashing, only the buttons to adjust
the temperature of the DHW are enabled.
Press the“CH + and -”button (E, g. 1) to select the desired ow water temperature. During selection, CH icon (4, g. 1) will ash. As soon as button is
released, icon will continue ashing for approx. 3 seconds, and temperature value will ash as well. After this time, value is stored and display standard
operation will be restored. In the phase in which the icon is ashing, only the buttons to adjust the heating temperature are enabled.

15
1.6. Time setting
1- To set time, minutes and day
of the week, press “set”.
2- Flashing values can be
edited by pressing“CH + and -”
buttons.
Press "ok" to conrm the
edited value and shift to next
parameter, press "reset" to
quit the function and go back
to starting page. Press "set"
to access the day and night
setting function described in
the following paragraph.

16
1.7. "Day temperature" and "night temperature" setting
When one or more ambient probes are connected to boiler electronic board, two levels of ambient temperatures can be set. Boiler will manage the
heating request based on the set temperatures, as follows. If no ambient probe is connected to the boiler, temperatures cannot be set.
"Day" temperature is identied by the symbol , while "night" temperature by the symbol .
The "day temperature" is active when bars are on, while "night"
temperature is active when bars are o.
1- Press“set” twice to access
the "day temperature" setting
mode.
2- Press“CH + and -”buttons to
edit "day temperature" values.
Press "ok" to conrm the edited
values and enter the "night
temperature" setting mode.
3- Press “CH + and -”buttons to
edit "night temperature" values.
4- Press "ok" to conrm the
edited values and quit the "day
and temperature" setting mode.
Bars "o"
Bars "on"

17
1.8. "Manual" programme setting
The "manual" mode selection indicated with symbol , allows activating the heating function, 24 hours a day, in both zones at the "day temperature",
disabling at the same time zone 1 and zone 2 programming. The water heater on the other side, is heated according to the specic programme.
1- Press“prog”to access the
manual programme setting
mode.
2- Press“ok” to conrm manual
programming activation.
Press "reset" to go back to the
starting page, namely to quit
the function.
1.9. "Automatic" programme setting
The selection of "automatic" mode, identied by symbol , allows boiler to enable heating of both zones in "day temperature" or "night
temperature", based on the programming envisaged for zone 1 and zone 2.
1- Press“prog”to access the
automatic programme setting
mode.
2- Press“ok” to conrm
automatic programming
activation. Press "reset" to
go back to the starting page,
namely to quit the function.

18
1.10. CH and water heater programme mode
To access zone 1 CH programme displaying or editing, press "prog" button twice.
1- The display shows zone
1 symbol ashing, sun or
moon symbols, bars on or o,
respectively, at 00:00. Clock
lights display the programming
connected to day 1 (Monday)
and 00:00 bar is ashing.
2- Press“ok” to access zone
programming function. "Prog"
wording starts ashing together
with number 1 (Monday). Press
“CH + and -”buttons to select the
desired day of the week.
Press "ok" to select the desired
day. Now you can associate the
day/night level to the desired
time of the day.
3- Whenever "day/night" button
(A, g. 1) is pressed, the sun and
moon symbols are alternatively
activated (sun = day level; moon
= night level).
At the same time, close to the
current time (ashing bar) clock
bar comes on if the "sun" icon
is on, and turns o the "moon"
icon is o. Current time is
indicated by both the clock and
the ashing bar.
Press“CH + and -”buttons to
move inside the dierent times
of the day.
4- To program other days of
the week or to program zone 2,
press“reset”. You will go back to
the starting page.
Whatever part of the programme can be quit by pressing the "reset" button twice. The procedure to program zone 2 and water heater, is very similar to
the one followed to program zone 1. Press the "prog" button to access, in sequence, to the following 4 programmes: manual; zone 1; zone 2; water heater.
If ambient probes are connected, the "day temperature" level and the "night temperature" will acquire the temperature value, and heating will be
active until the temperature measured by the ambient probe reaches the preset value for the dierent time slots.
When no ambient probe is connected, the two day/night levels will acquire the on and o values. So heating is ON in the selected periods with the
sun symbol, while it is OFF in the selected periods with the moon symbol.
In case of connection with Open Therm remote control, that zone shall not be managed by boiler boards, as it will be directly managed by the
Remote Control and, as a consequence, zone programming will be inhibited.

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1.11. Parameter display
Press “Info” (A, g. 1) to scroll the dierent parameter values. You can quit this function at any time by simply pressing the "Reset" button. Paragraph
3.2.14 describes the meaning of all parameters.
PARAMETERS DESCRIPTION
P30 - TSP30 External temperature displaying (if an external probe is present).
P31 Flow temperature displaying.
P32
Calculated nominal ow temperature displaying.
If no external probe is installed, the ow temperature manually set on boiler will be displayed. If an external probe is installed, the ow
temperature boiler calculated through the curves on g. 27 will be displayed
P33 Displaying of ow temperature set for zone 2 (V versions)
P34 Displaying of ow temperature currently detected for zone 2 (V versions)
P36 Displaying of ow temperature set for zone 3 (Z versions)
P37 Displaying of ow temperature currently detected for zone 3 (Z versions)
P43 Displaying of return temperature.
P44 Displaying of water heater temperature.
P45 Displaying of ue gas temperature.
P49 Displaying of ambient probe 1 temperature (if ambient probe is connected).
P50 Displaying of ambient probe 2 temperature (if ambient probe is connected).
Table 3 - Displayable parameters with info button

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1.12. Failures that cannot be reset
The display shows the failure based on the corresponding error code (see paragraph 1.2). Some failures can be reset through the reset key, while
some others are self-resettable. Refer to the following paragraph (“Resume boiler function”).
If failures cannot be reset but are of the self-resettable type, no key will be enabled and only the LCD back-lighting will be on. As soon as the error
cause is eliminated, the failure signal will disappear from the interface, this latter will be enabled and, 15 seconds after no key is touched, all the
keys but the one around the LCD will be disabled.
1.13. Resume boiler function
The display shows the failure based on the corresponding error code (see paragraph 1.2). Some failures can be reset through the reset key, while
some others are self-resettable.
If shut-downs can be reset (E01, E02, E03, E40, E80, E86, E87), the reset key will always be on as well as the LCD back-lighting. The only active key
you can press is the "reset" key.
When the reset key is pressed and boiler is under the correct conditions, the error is reset. The failure signal will disappear from the interface, this
latter will be enabled and, 15 seconds after no key is touched, all the keys but the one around the LCD will be disabled.