Baxi Power HT User manual

0085
Caldaie a terra a gas a condensazione
manuale per l’uso destinato all’utente ed all’installatore
IT
Brennwert- Gaskessel
Gebrauchsanleitung für den Verbraucher und den Installateur
AT
Floor standing condensing gas boilers
Installation, operation and maintenance Manual
GB

74 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
Dear Customer,
We are sure your new boiler will comply with all your requirements.
Purchasing one of the BAXI products satises your ex pec ta tions: good functioning, simplicity
and ease of use.
Do not dispose of this booklet without reading it: this manual contains the information, which
will help you to run your boiler correctly and efciently.
Do not leave any parts of the packaging (plastic bags, polystyrene, etc.) within children’s reach as they are a
potential source of danger.
ATTENTION
This device can only be installed and operate
in permanent, ventilated rooms in accordance with
the Rules in force
BAXI S.p.A. declares that these models of boiler bear the CE mark in compliance with
the basic requirements of the following Directives:
- Gas Directive 90/396/EEC
- Efciency Directive 92/42/EEC
- Electromagnetic Compatibility Directive 2004/108/EEC
- Low Voltage Directive 2006/95/EC
BAXI S.p.A., a leading European manufacturer of hi-tech boilers and heating systems, has developed CSQ-certied
quality management (ISO 9001), environmental (ISO 14001) and health and safety (OHSAS 18001) systems. This means
that BAXI S.p.A. includes among its objectives the safeguard of the environment, the reliability and quality of its products,
and the health and safety of its employees.
Through its organisation, the company is constantly committed to implementing and improving these aspects in favour
of customer satisfaction.

75 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
1. Instructions prior to installation 76
2. Instructions prior to commissioning 76
3. Commissioning of the boiler 77
4. Filling the boiler 84
5. Switching the boiler off 84
6. Prolonged standstill of the system. Frost protection 84
7. Servicing instructions and gas change 84
8. General information 85
9. Instructions prior to installation 85
10. Boiler installation and dimensions 86
11. Chimney ue connection 89
12. Connecting the mains supply 91
13. Adjusting the gas valves and gas change 98
14. Setting the boiler parameters 102
15. Control and operation devices 103
16. Positioning of the ignition and ame sensing electrode 104
17. Check of combustion parameters 104
18. Activating the ue-sweeper function 105
19. Annual service 105
20. Boiler schematic 106
21. Illustrated wiring diagram 107-108
22. Technical data 109
CONTENTS
ISTRUCTIONS PERTAINING TO THE USER
ISTRUCTIONS PERTAINING TO THE INSTALLER

76 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The boiler
must be connected to a central heating system and/or to a domestic hot water supply system in compliance
with its performances and output power.
The boiler must be installed by a Qualied Service Engineer and ensure the following operations are carried
out:
a) check that the boiler is t for operation with the type of gas available. For more details see the notice on the
packaging and the label on the appliance itself.
b) careful checking that the ue terminal draft is appropriate; that the terminal is not obstructed and that no
other appliance exhaust gases are expelled through the same ue duct, unless the ue is especially desig-
ned to collect the exhaust gas coming from more than one appliance, in conformity with the standards and
regulations in force.
c) careful checking that, in case the ue has been connected to pre-existing ue ducts, thorough cleaning has
beencarriedoutinthatresidualcombustionproductsmaycomeoffduringoperationof theboiler andobstruct
the ue duct.
d) to ensure correct operation of the appliance and avoid invalidating the guarantee, observe the following
precautions:
1. Heating circuit
1.1.new system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out thoroughly to
eliminate residual thread-cutting swarf, solder and solvents if any, using suitable proprietary products.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non
alkaline. The recommended products for cleaning are:
SENTINEL X300 or X400 and FERNOX heating circuit restore. To use this product proceeding strictly
in accordance with the maker’s directions.
1.2. existing system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out to remove
sludge and contaminants, using suitable proprietary products as described in section 1.1.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-
alkaline such us SENTINEL X100 and FERNOX heating circuit protective. To use this product proceeding
strictly in accordance with the maker’s directions.
Remember that the presence of foreign matter in the heating system can adversely affect the operation
of the boiler (e.g. overheating and noisy operation of the heat exchanger).
Failure to observe the above will render the guarantee null and void.
1. INSTRUCTIONS PRIOR TO INSTALLATION
Initial lighting of the boiler must be carried out by a qualied service engineer. Ensure the following operations
are carried out:
a) compliance of boiler parameters with (electricity, water, gas) supply systems settings.
b) compliance of installation with the standards and regulations in force.
c) appropriate connection to the power supply and earthing of the appliance.
Failure to observe the above will render the guarantee null and void.
The instructions shall state the substance of the following:
This appliance is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilities, or lack of experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
2. INSTRUCTIONS PRIOR TO COMMISSIONING

77 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
KEYS DISPLAY SYMBOLS
Central heating mode setting key
Data display reset key
Parameter setting key (increase value)
Parameter setting key (decrease value)
Program access and scroll key
Program access and scroll keys
Reset key
Domestic hot water temperature setting key
Central heating water temperature setting key
Domestic hot water on/off key
Resettable alarm warning
Flame present (on)
Outdoor temperature
Standby (off)
Operation in manual mode at minimum tem-
perature
Operation in manual mode at the maximum
temperature set
Operation in automatic mode
Operation in central heating mode
Operation in domestic hot water mode
020503_1100
Figure 1
IMPORTANT: Domestic Hot Water (D.H.W.) instructions here discribed, are to take in account only if the
boiler is connected to a D.H.W. production system.
To correctly light the burner proceed as follows:
1) provide power supply to the boiler;
2) open the gas cock;
3) follow the directions given below regarding the adjustments to be made at the boiler control panel.
3. COMMISSIONING OF THE BOILER
SECONDARY display
MAIN display

78 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
020503_0800
Figure 2
• Automatic operation. Operation of the boiler is controlled by the timed program as described
in point 3-5.1 “Daily timed program for operation of the central heating system”;
• Manual operationat the maximumtemperature set. Theboilercomesintooperationregardless
of the timed program set. The operating temperature is that set using the key (point 3-3:
“Setting the maximum central heating temperature”);
• Manual operation at minimum temperature. The operating temperature is that set in point
3-6: “setting the minimum central heating temperature”.
• standby. The boiler does not work in central heating mode, although the antifreeze function is
still enabled.
(1) Domestic hot water on/off key: This key can be pressed to activate or deactivate this function,
which is identied on the display by a black cursor line under the symbol .
(4) Reset key. In case of a fault, referred to in point 3-7 “Faults and resetting the boiler”, the boiler can
be restarted by pressing this key for at least two seconds.
If this key is pressed with no fault present, the display will show the message “E153”, and the same key
has to be pressed again (for at least two seconds) to restart the boiler.
(9) Data key. This key can be pressed repeatedly to display the following information:
- Temperature (°C) of the domestic hot water ( );
- outdoor temperature (°C) ( ); only provided with the outdoor temperature sensor probe connected.
Press either of the keys to return to the main menu.
Dash
“Automatic mode”
active
(2) Central heating water temperature setting key. This key can be pressed to set the central heating
water output temperature as described in point 3-3.
(3) Domestic hot water temperature setting key. This key can be pressed to set the domestic hot
water temperature as described in point 3-4.
(10) Central heating mode operating key
.
The key can be pressed to activate four boiler central heating operating modes; these modes are
identied by a black cursor line underneath the relative symbol on the display, and are as follows:
3.1 DESCRIPTION OF KEYS

79 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
•Press either of the keys to access the programming function;
the display will show the letter P followed by a number (program line);
•press the keys until the display shows P1, referring to the time to be set;
•press the keys to set the time; on the display, the letter P will start to ash;
•press the key to save and exit the programming function;
020503_0700
Figure 3
3.2 SETTING THE TIME
- Press the key (2-gure 1) to set the central heating water temperature;
- Press the keys to set the temperature required;
- press either of the keys (1 or 10 - gure 1) to save and return to the main menu.
N.b –Withthe outdoorsensor connected,the key (2 - gure 1) can be used to shift the central heating curve.
Press the keys to decrease or increase the room temperature in the premises to be heated.
3.3 SETTING THE MAXIMUM CENTRAL HEATING TEMPERATURE
- Press the key (3-gure 1) to set the maximum domestic hot water temperature;
- Press the keys to set the temperature required;
- press either of the keys (1 or 10 - gure 1) to save and return to the main menu.
3.4 SETTING THE MAXIMUM DOMESTIC HOT WATER TEMPERATURE

80 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
- Press either of the keys to access the programming function;
a) press these keys until the display shows P11, referring to the program start time;
b) press the keys to set the time;
- press the key; the display will show P12, referring to the program end time;
-repeat the operations described in points a and b until the third and last cycle is reached (program line
P16);
-press the key to save and exit from the programming function.
3.5 SETTING THE DAILY PROGRAM FOR OPERATION IN CENTRAL HEATING AND DOMESTIC HOT WATER MODES
3.5.1 Setting the daily times for central heating mode operation
3.5.2 Setting the daily times for domestic hot water mode operation
- Factory setting of D.H.W. function is enable (ON) while is disabled D.H.W. daily times program. To enable
D.H.W. daily times program see section 14 (parameter H91).
Setting the daily times for domestic hot water mode operation-Carry out the operations described in section
3.5.1 for program lines 31 to 36.
3.6 SETTING THE MINIMUM CENTRAL HEATING TEMPERATURE
- press either of the keys to access the programming function;
- press these keys until the display shows P5, referring to the temperature to be set;
- press the keys to set the temperature required.
This operating mode is enabled when minimum temperature central heating mode “ ” is activated or when
the daily central heating program does not require heat.
N.B – With the outdoor sensor connected, parameter P5 can be used to set the minimum room tempe-
rature in the premises to be heated.

81 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
Range
0…23:59
25..80
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
00:00…24:00
0...1
Factory
setting
———-
25
6:00
22:00
0:00
0:00
0:00
0:00
0:00
24:00
0:00
0:00
0:00
0:00
0
Parameter description
Time of day setting
Minimum central heating temperature setting (°C)
Start of rst daily period of automatic central heating
End of rst daily period of automatic central heating
Start of second daily period of automatic central heating
End of second daily period of automatic central heating
Start of third daily period of automatic heating
End of third daily period of automatic central heating
Start of rst daily period of domestic hot water production
End of rst daily period of domestic hot water production
Start of second daily period of domestic hot water production
End of second daily period of domestic hot water production
Start of third daily period of domestic hot water production
Fine End of third daily period of domestic hot water production
Reset of daily central heating and domestic hot water production programs (factory settings).
Press the - + keys together for about 3 seconds; the number 1 appears on the display.
Conrm by pressing either of the keys
Parameter
N.
P1
P5
P11
P12
P13
P14
P15
P16
*P31
*P32
*P33
*P34
*P35
*P36
P45
*Parameters for program lines P31 to P36 are displayed only if Domestic Hot Water (D.H.W.) program (pa-
rameter H91 see section 14) is activated.
3.7 TABLE FO USER-SETTABLE PARAMETERS

82 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
If a fault occurs, a ashing warning code appears on the display.
The fault warnings appear on the main display (gure 1 a) together with the symbol (Figure 4).
To reset, press the reset button for at least two seconds.
020503_0500
Figure 4
020503_0600
Figure 4.1
Fault warnings appear on the secondary display (gure 1 b) alternating with the time, both of them ashing
(gure 4.1). It is not possible to reset malfunction warnings which appear on the secondary display as the cause
of the alarm has rst to be removed.
3.8 FAULT WARNINGS AND RESETTING THE BOILER

83 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
All the faults are displayed in order of importance; if several faults occur simultaneously, the rst to be displayed
is the one with highest priority. After the cause of the rst fault has been removed, the second one will be
displayed, and so on.
If any given fault occurs frequently, contact the authorised Service Centre.
Corrective action
Call an authorised service centre.
Call an authorised service centre.
Call an authorised service centre.
Press the reset key (for about 2 seconds: if this device is triggered repeatedly, call
the authorised service centre)
Call an authorised service centre.
Call an authorised service centre.
Call an authorised service centre.
Press the reset key (for about 2 seconds); if the fault persists, call the authorised
service centre)
If symbol is displayed, press the reset button otherwise switch off the
electricity supply to the boiler for at least 10 seconds; if the fault persists, call the
authorised service centre.
Check the positioning of the ignition and ame sensing electrode (see section 16).
Press the key again (about 2 seconds)
Press and hold reset button (2 seconds approx.) then press again when warning
E153 appears
Call an authorised service centre.
Check that the system is at the rated pressure. (refer to the section on lling the
system). if the fault persists, call the authorised service centre.
Description of fault
Outdoor temperature sensor fault
ntc output sensor failure
domestic hot water ntc sensor failure
safety or ue gas thermostat tripped
Loss of ame during operation (the
ionization current has fallen below
the limit)
Minimum fan speed limit is hurt
oor thermostat tripped
no gas
boiler circuit board error
the reset key has been pressed
inappropriately
internal error on boiler circuit module
fan speed threshold not reached
no hydraulic differential pressure
switch enabling signal
Error
code
E10
E20
E50
E110
E128
E129
E132
E133
E151
E153
E154
E160
E164
3.9 TABLE OF FAULTS AND ERROR MESSAGES

84 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE USER
To shut down the boiler switch off the electrical supply to the appliance.
IMPORTANT: Regularly check that the pressure gauge (1 - gure 17) reads out a pressure of 1 - 1.5 bar when
the central heating system is cold. Open the boiler drain cock (16 - gure 17) to reduce pressure if it is too high.
Open the lling cock to increase pressure if it too low.
Always open the lling cock very slowly to allow any air to bleed off.
If the pressure in the system drops frequently, contact an authorised service centre to have the system che-
cked.
N.B.: Take special care when lling the heating system. In particular, open any thermostat valves in the system,
ensure the water enters slowly in order to prevent the formation of air inside the primary circuit until operating
pressure is reached. Lastly, vent any radiators in the system. BAXI declines all liability for damage deriving
from the presence of air bubbles in the primary exchanger due to the incorrect or imprecise observance of the
above.
Werecommendyou avoiddrainingthe wholesystemaswaterreplacementsengenderpurposelessand harmful
limestone deposits inside the boiler and on the heating elements.
In case the boiler is not operated during wintertime and is therefore exposed to danger of frost we suggest you
add some specic-purpose anti-freeze to the water contained in the system (e.g.: propylene glycole coupled
with corrosion and scaling inhibitors).
The electronic management of boilers includes a “frost protection” function in the central heating system which
operates the burner to reach a heating ow temperature of 30° C when the system heating ow temperature
drops below 5°C.
The frost protection function is enabled if:
* electrical supply to the boiler is on;
* the gas service cock is open;
* the system pressure is as required;
* the boiler is not blocked.
To maintain efcient and safe operation of your boiler have it checked by a Qualied Service Engineer at the
end of every operating period.
Careful servicing will ensure economical operation of the system.
Do not clean the outer casing of the appliance with abrasive, aggressive and/or easily ammable cleaners
(i.e.: gasoline, alcohol, and so on). Always isolate the electrical supply to the appliance before cleaning it (see
section 5 Turning off the boiler).
These boilers produced for natural gas can be converted to work with LPG.
Any gas change be effected by a Qualified Service Engineer.
4. FILLING THE SYSTEM
5. SWITCHING THE BOILER OFF
6. PROLONGED STANDSTILL OF THE SYSTEM. FROST PROTECTION
7. SERVICING INSTRUCTIONS AND GAS CHANGE

85 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The boiler
must be connected to a central heating system and to a domestic hot water supply system in compliance with
its performances and output power.
IMPORTANT! The following components are not installed in the boiler as supplied. It is the installer’s
responsibility to provide them:
• Expansion vessel;
• Pressure safety valve;
• Circulation pump;
• Filling system cock.
Before connecting the boiler have the following operations effected:
a) careful checking that the boiler is t for operation with the type of gas available. For more details see the
notice on the packaging and the label on the appliance itself.
b) careful checking that the ue terminal draft is appropriate; that the terminal is not obstructed and that no other
appliance exhaust gases are expelled through the same ue duct, unless the ue is especially designed to
collect the exhaust gas coming from more than one appliance, in conformity with the standards and regula-
tions in force.
c) careful checking that, in case the ue has been connected to pre-existing ue ducts, thorough cleaning has
beencarriedoutinthatresidualcombustionproductsmaycomeoffduringoperationof theboiler andobstruct
the ue duct.
The following remarks and instructions are addressed to Service Engineers to help them carry out a faultless
installation. Instructions regarding lighting and operation of the boiler are contained in the ‘Instructions pertai-
ning to the user’ section.
Note that installation, maintenance and operation of the gas appliances must be performed exclusively by
qualied personnel in compliance with current standards.
Please note the following:
• Install the boiler in a permanent ventilated central heating boiler room.
• This boiler can be connected to any type of convector plates, radiators, thermoconvectors. Design the system
sections as usual though taking into account the available output / pump head performances.
• Do not leave any packaging components (plastic bags, polystyrene, etc.) within children’s reach as they are
a potential source of danger.
• Initial lighting of the boiler must be effected by a Qualied Service Engineer.
• Make sure that the room where the boiler is installed has a sufcient supply of air to ensure complete combu-
stionof thegasconsumedbytheappliance.Installunblockableventilationgrillesas necessaryin accordance
with the Rules in force.
• Connect the boiler directly to an efcient ue to vent all fumes and combustion gases outdoors. Make sure
that the pipe connecting the boiler to the ue is not smaller in diameter than the boiler’s ue outlet. Make
sure that the ue is in good condition and free from holes or cracks that could reduce draw.
Failure to observe the above will render the guarantee null and void.
8. GENERAL INFORMATION
9. INSTRUCTIONS PRIOR TO INSTALLATION

86 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
10. BOILER INSTALLATION AND DIMENSIONS
Install the boiler in a position that ensures easy maintenance. You must be able to fully open the front access
door and have adequate access to the rear of the boiler.
If possible, install the boiler on a raised base of 200 mm in height to facilitate drainage of ue condensate.
When calculating the weight of the boiler on the oor, bear in mind the weight of the water in the heat exchanger
(see table 1).
Adjust the levelling feet to compensate for any unevenness in the oor.
Install the necessary utility connections starting from the water and gas connections on the rear of the boiler
(see table 1 for tting type and size).
The following steps are strongly recommended:
• Install two shut-off valves, one on the heating circuit delivery pipe (MR) and the other on the return pipe (RR)
so that you can service the boiler without having to drain the entire heating system.
• Use a metal pipe to connect the boiler’s gas connection to the gas supply point, and t a (mandatory) shut-
off valve upstream from the boiler.
• Fit three-part joints in the water and gas connections to and from the boiler to separate it mechanically from
utility supplies.
• Fit a water separator (header).
• Install an automatic water lling system to keep the heating circuit full.
These appliances do not have any circulation pump, expansion tank or safety valve. These devices
must therefore be provided elsewhere in the system, and must be sized to suit the system’s thermal
capacity.
N.B.: Take special care when lling the heating system. In particular, open any thermostat valves in the system,
ensure the water enters slowly in order to prevent the formation of air inside the primary circuit until operating
pressure is reached. Lastly, vent any radiators in the system. BAXI declines all liability for damage deriving
from the presence of air bubbles in the primary exchanger due to the incorrect or imprecise observance of the
above.
Connect the ue condensate drain pipe to a suitable water drain, ensuring an adequate slope.
To drain the boiler, use the drain tap at the rear.
To ensure correct operation of the appliance and avoid invalidating the guarantee, observe the following
precautions:
1. Heating circuit
1.1.new system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out thoroughly to
eliminate residual thread-cutting swarf, solder and solvents if any, using suitable proprietary products.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non
alkaline. The recommended products for cleaning are:
SENTINEL X300 or X400 and FERNOX heating circuit restore. To use this product proceeding strictly
in accordance with the maker’s directions.
1.2. existing system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out to remove
sludge and contaminants, using suitable proprietary products as described in section 1.1.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-
alkaline such us SENTINEL X100 and FERNOX heating circuit protective. To use this product proceeding
strictly in accordance with the maker’s directions.
Remember that the presence of foreign matter in the heating system can adversely affect the operation
of the boiler (e.g. overheating and noisy operation of the heat exchanger).
Failure to observe the above will render the guarantee null and void.

87 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
Table 1
Figure 5
MR: heating ow
RR: heating return
GAS: gas inlet to the boiler
SC: condensate drain
predisposition for
controller RVA point
Insert the flue-gas union
and fasten the connector
to the flue-gas thermo-
stat
Model Depth Height Wight Gas Fitting Fitting Water contents
POWER HT.. (mm) (mm) (mm) tting MR RR ( l )
A(CH) (CH)
1.850 801 850 450 G 3/4” G 1’’ G 1’’ 13,7
1.1000 871 850 450 G 1” G 1 1/4” G 1 1/4” 21
1.1200 1024 850 450 G 1” G 1 1/4” G 1 1/4” 23,3
1.1500 1132 850 450 G 1” G 1 1/4” G 1 1/4” 25,3
0601_2007/CT0666
SC
GAS
RR
MR

88 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
Figure 6
CONDENSATE DRAIN
Check that the water ow rate is no lower than as stated
0601_2001_CT_0615
For the choice of water sepa-
rator refer to the declaration
made by the manufacturer,
according to the water flow
rates given in the table below
POWER HT Minimum water Water flow rate
Model flow rate with ∆t=20°K
l/h l/h
1.850 1900 3700
1.1000 2100 4300
1.1200 2600 5200
1.1500 3300 6500
10.1 BOILER PRESSURE LOSS

89 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
Exchangers pressure drop (mH2O)
WATER FLOW RATE (l/h)
Graph 1
0502_2105
Exchangers pressure drop (mH2O)
WATER FLOW RATE (l/h)
Graph 1.1
POWER HT
1.850 - 1.1000
EXCHANGERS
PRESSURE DROP.
POWER
HT
1.1200 - 1.1500
EXCHANGERS
PRESSURE DROP.
0601_2008
120 kW
Connect the boiler to the ue using a pipe made of stainless steel or plastic material with an internal diameter
of 100 mm, capable of resisting normal mechanical stresses over time, as well as high temperatures (<120°C)
and the chemical effects of fuel gases and their condensates.
Insert the flue-gas union and fasten the connector to the flue-gas thermostat before hooking up to
the flue.
Whenever possible use a ue connection that can be disconnected for maintenance.
Important! Horizontal flue sections must have a minimum slope of 3° towards the boiler.
Flue accessories made of plastic material for cascade or single installations are available (diameter 110 mm)
11. CHIMNEY FLUE CONNECTION

90 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
Figure 7
0512_1809
0512_1808/CT0667
In case exhaust and intake flues not supplied by BAXI S.p.A. have been installed, these must be certified
for the type of use and must have a maximum pressure drop in according to the values reported in the
table.
To ensure the correct rated heat input to the maximum and minimum heat input, it is necessary to update the
speed (rpm) of the fan, it depends on the lenght of the pipes, in accordance with the installation of ue and
air pipes as indicated in the tables below.
The factory-set value is referred to the minimum length of ue pipe (0÷10 m). To carry such updating, changing
the speed of the fan at the (rpm and pwm%) , refer to par. 13÷14.
Max. length of ue duct ( L) : 20 m
Each 90° bend reduces the duct max. length by : 1 m
Each 45° bend reduces the duct max. length by : 0,5 m
TABLE FUMES PRESSURE AVAILABLE
Cascade solution
∆P available
ue duct B23 Ø 100
∆P available with single
Clapet Ø 110/110
∆P available with
double Clapet Ø 110/110
HT 1.850 110 110 -
HT 1.1000 150 110 -
HT 1.1200 170 - 80
HT 1.1500 280 - 120
WARNING
To guarantee more operating insurance it is necessary to assure the flue pipes to the wall using the
apposite clamps.

91 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
12. MAKING THE ELECTRICAL CONNECTIONS
Electrical safety of the appliance is only guaranteed by correct grounding, in accordance with the rules in for-
ce.
Connect the boiler to a 230V monophase + ground power supply by means of the three-pin cable supplied with
it and make sure you connect polarities correctly.
Use a double-pole switch with a contact separation of at least 3mm in both poles.
In case you replace the power supply cable t a HAR H05 VV-F’ 3x0.75mm2cable with an 8mm diameter
max.
IMPORTANT: Check that the overall current drawn by accessories connected to the appliance is less
than 2 A. If the value is greater, a relay must be wired between the boiler control circuit board and the
accessories drawing the higher current.
12.1 TERMINAL BLOCKS ACCESS
• Cut off power to the boiler with the two-pole switch.
• Remove the top facia panel cover (which is held by magnets).
• Unscrew the two screws holding the facia panel in place.
• Swing the facia panel forwards.
Main terminal block M1
• Remove the clip-on cover from terminal strip M1.
• The main terminal block incorporates a fast blow 3.15 A fuse (gure 8). Remove the black fuse holder to
check and/or replace the fuse.
Terminal block M2
• Unscrew the xing screw and remove the cover from terminal block M2.
Terminal block M3
• Unscrew the xing screws and remove the main cover.
Figure 8
Terminal board
Terminal board
Cover
Terminal board
Cover
0902_1201 / CT_0674
CAUTION
If the appliance is directly connected to a underoor system, install a safety thermostat to prevent the latter from overheating.

92 912.199.3 - GB
ISTRUCTIONS PERTAINING TO THE INSTALLER
The pumps of the heating system (P1 and P2) have to be connected to boiler terminal block following the wiring
of gure 9, a relay must be wired between the boiler control circuit board and the pumps.
Figure 9
12.2 CONNECTING THE PUMPS
Terminal board
Terminal board
Terminal board
Cover
Cover
0902_1202 / CT_0676