Baxi Power HT 1.850 User manual

HydroHeat Supplies Pty. Ltd.
6 Helen Kob Drive, Braeside, Victoria 3195
Phone: [phone] Fax: [phone]
Web: hydroheat.com.au
Power HT
0085
Floor standing condensing gas boilers
Installation, operation and maintenance Manual
EN
AUS
Hydroheat Supplies Pty Ltd
PO Box 1045, 6 Helen Kob Drive
Braeside VIC 3195
Ph 03 9588 1299 Fax [phone]
0085
Floor standing condensing gas boilers
Installation, operation and maintenance Manual
EN
AUS
Hydroheat Supplies Pty Ltd
PO Box 1045, 6 Helen Kob Drive
Braeside VIC 3195
Ph 03 9588 1299 Fax [phone]

hydroheat.com.au
2910.026.1 - EN (AUS)
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 expectations: good functioning, simpli-
city and ease of use.
Donotdisposeofthisbookletwithoutreadingit:thismanualcontainstheinformation,which
will help you to run your boiler correctly and efciently.
ATTENTION
This device can only be installed and operate
in permanent, ventilated rooms in accordance with
the Rules in force
Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as
they are a potential source of danger.
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 2009/142/EC
- Efciency Directive 92/42/EEC
- Electromagnetic Compatibility Directive 2004/108/EC
- 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
thatBAXIS.p.A.includesamongitsobjectivesthesafeguardoftheenvironment,thereliability and quality of itsproducts,
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.

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ISTRUCTIONS PERTAINING TO THE USER
1. Instructions prior to installation 4
2. Instructions prior to commissioning 4
3. Commissioning of the boiler 5
4. Filling the boiler 11
5. Switching the boiler off 11
6. Prolonged standstill of the system. Frost protection 11
7. Servicing instructions and gas change 11
8. General information 12
9. Instructions prior to installation 12
10. Boiler installation and dimensions 13
11. Chimney ue connection 17
12. Connecting the mains supply 19
13. Adjusting the gas valves and gas change 25
14. Setting the boiler parameters 29
15. Control and operation devices 30
16. Positioning of the ignition and ame sensing electrode 31
17. Check of combustion parameters 31
18. Activating the ue-sweeper function 32
19. Annual service 32
20. Boiler schematic 33
21. Illustrated wiring diagram 34-35
22. Technical data 36
CONTENTS
ISTRUCTIONS PERTAINING TO THE USER
ISTRUCTIONS PERTAINING TO THE INSTALLER

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ISTRUCTIONS PERTAINING TO THE USER
This appliance shall be installed in accordance with the manufacturer’s installation instructions, local gas t-
ting, electrical and water authority regulations, municipal building codes, AS5601 - Gas Installations and any
other relevant statutory regulations. 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.
TheboilermustbeinstalledbyaQualiedServiceEngineerandensurethefollowingoperationsarecarriedout:
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 been carried out in that residual combustion products may come off during operation of the boiler and
obstruct 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
Beforeproceedingwithinstallationoftheboiler, the system must be cleaned and ushed out thoroughly
toeliminateresidualthread-cuttingswarf,solderandsolventsifany, using suitable proprietaryproducts.
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-
alkalinesuchusSENTINELX100andFERNOXheatingcircuitprotective.Touse this productproceeding
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.
WARNING - This appliance is not suitable as a pool heater.
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 concer-
ning 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

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ISTRUCTIONS PERTAINING TO THE USER
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
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
SECONDARY display
MAIN display

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ISTRUCTIONS PERTAINING TO THE USER
• 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 operation at the maximum temperature set. Theboilercomes intooperation regardless
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.
020503_0800
Figure 2
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

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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 – With the outdoor sensor connected, the key (2 - gure 1) can be used to shift the central heating
curve. Pressthe keysto decreaseor increase the roomtemperature in the premisesto 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

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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).
Settingthedailytimes 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.

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ISTRUCTIONS PERTAINING TO THE USER
Parameter
N. Parameter description Factory setting Range
P1 Time of day setting ———- 0…23:59
P5 Minimum central heating temperature setting (°C) 25 25..80
P11 Start of rst daily period of automatic central heating 6:00 00:00…24:00
P12 End of rst daily period of automatic central heating 22:00 00:00…24:00
P13 Start of second daily period of automatic central heating 0:00 00:00…24:00
P14 End of second daily period of automatic central heating 0:00 00:00…24:00
P15 Start of third daily period of automatic heating 0:00 00:00…24:00
P16 End of third daily period of automatic central heating 0:00 00:00…24:00
*P31 Start of rst daily period of domestic hot water production 0:00 00:00…24:00
*P32 End of rst daily period of domestic hot water production 24:00 00:00…24:00
*P33 Start of second daily period of domestic hot water production 0:00 00:00…24:00
*P34 End of second daily period of domestic hot water production 0:00 00:00…24:00
*P35 Start of third daily period of domestic hot water production 0:00 00:00…24:00
*P36 Fine End of third daily period of domestic hot water production 0:00 00:00…24:00
P45 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 0 0...1
*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
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(gure1b)alternatingwith thetime,
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

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ISTRUCTIONS PERTAINING TO THE USER
All the faults are displayed in order of importance; if several faults occur simultaneously, the rst to be displa-
yed 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.
3.9 TABLE OF FAULTS AND ERROR MESSAGES
In case of electrical power supply faults when the boiler is in operation, no gas leakage will occurr,
as the gas valve will turn off leaving the gas duct closed. The boiler will not signal any failure (lockout
error will not appear), and, in case the heating request is still pending after the electrical power supply
resumes, it restart to light on the burner starting a new heating cycle.
WARNING: POWER SUPPLY FAULTS
Error code Description of fault Corrective action
E10 Outdoor temperature sensor fault call the authorised service centre.
E20
NTC output sensor failure call the authorised service centre
E40 NTC return heating probe faulty call the authorised service centre
E50 domestic hot water ntc sensor failure call the authorised service centre
E110
Safety or fumes thermostat or heating return
temperature probe tripped
press the reset key (for about 2 seconds: if this device is
triggered repeatedly, call the authorised service centre)
E111 Delivery temperature higher than 95°C If this fault persists, call the authorised service centre
E128 Loss of ame during operation (the ionization
current has fallen below the limit) Call an authorised service centre.
E129 Minimum fan speed limit is hurt Call an authorised service centre.
E132 oor thermostat tripped call the authorised service centre
E133 no gas press the reset key (for about 2 seconds); if the fault
persists, call the authorised service centre)
E151 boiler circuit board error
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).
E153 theresetkey has beenpressedinappropriately press the key again (about 2 seconds)
E154
No circulation or reverse flow call the authorised service centre
E160 fan speed threshold not reached call the authorised service centre.
E164 no hydraulic pressure switch enabling signal 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.

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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.
Ifthe pressurein the system dropsfrequently,contact an authorised service centreto have the system checked.
N.B.: Takespecialcarewhen lling the heatingsystem. 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
pressureis reached.Lastly,ventany radiators in the system.BAXI declines all liabilityfor damage deriving from
thepresence of airbubblesintheprimaryexchangerduetotheincorrector impreciseobservance of the above.
We recommendyou avoid draining the whole systemaswaterreplacementsengender purposelessandharmful
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).
Theelectronicmanagement of boilers includes a “frostprotection”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 should be performed by an authorised person.
Servicing shall be carried out only by authorised personnel.
For service and spare parts contact Hydroheat Supplies on [phone].
4. FILLING THE SYSTEM
5. SWITCHING THE BOILER OFF
6. PROLONGED STANDSTILL OF THE SYSTEM. FROST PROTECTION
7. SERVICING INSTRUCTIONS AND GAS CHANGE

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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 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 been carried out in that residual combustion products may come off during operation of the boiler and
obstruct 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 per-
taining 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
combustion of the gas consumed by the appliance. Install unblockable ventilation grilles as necessary in
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.
WARNING - Before Leaving
Test the operation of the appliance after installation is complete. Check all connections for gas leaks with soap
and water. DO NOT use a naked ame for detecting leaks. When satised with the boiler, please instruct the
user on the correct method of operation. In case the appliance fails to operate correctly after all checks have
been carried out, refer to the authorised service provider in your area”.
8. GENERAL INFORMATION
9. INSTRUCTIONS PRIOR TO INSTALLATION

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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.
Whencalculating the weight of the boiler on the oor,bear in mind the weight of thewaterintheheatexchanger
(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.
Connect the condensate drain using plastic pipe to sewer, ensuring an adequate slope.Fit condensate treatment
if sewer not plastic. To drain the boiler, use the drain tap at the rear.
N.B.: Takespecialcarewhen lling the heating system. In particular,openanythermostat valves in the system,
ensure the water enters slowly in order to prevent the formation of air inside the primary circuit until operating
pressureis reached.Lastly,vent any radiators in the system.BAXI declinesallliabilityfordamagederiving from
thepresenceofairbubbles in the primary exchanger due to theincorrector impreciseobservance of the above.
To ensure correct operation of the appliance and avoid invalidating the guarantee, observe the following
precautions:
1. Heating circuit
1.1.new system
Beforeproceedingwithinstallationoftheboiler, the system must be cleaned and ushed out thoroughly
toeliminate residualthread-cuttingswarf,solderandsolvents if any, using suitable proprietaryproducts.
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-
alkalinesuch us SENTINEL X100 andFERNOXheatingcircuitprotective.To usethisproductproceeding
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.

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ISTRUCTIONS PERTAINING TO THE INSTALLER
Model
POWER
HT..
Depth
(mm)
A
Height
(mm)
Wight
(mm)
Gas
fitting
Fitting
MR
(CH)
Fitting
RR
(CH)
Water contents
( l )
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
Table 1
Figure 5
MR: heating flow
RR: heating return
GAS: gas inlet to the boiler
SC: condensate drain
Insert the flue-gas union
and fasten the connector
to the flue-gas thermo-
stat
CT_0806 / 0902_2501
SC
GAS
RR
MR

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ISTRUCTIONS PERTAINING TO THE INSTALLER
Check that the water ow rate is no lower than as stated
POWER HT
Model
Minimum water
flow rate
l/h
Water flow rate
with ∆t=20°K
l/h
1.850 1900 3700
1.1000 2100 4300
1.1200 2600 5200
1.1500 3300 6500
10.1 BOILER PRESSURE LOSS
Figure 6
CONDENSATE DRAIN
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
CT_0807 7 0902_2502

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ISTRUCTIONS PERTAINING TO THE INSTALLER
Exchangers pressure drop (mH2O)
WATER FLOW RATE (l/h)
Graph 1
0502_2105
POWER HT
1.850 - 1.1000
EXCHANGERS
PRESSURE DROP.
POWER
HT
1.1200 - 1.1500
EXCHANGERS
PRESSURE DROP.
Exchangers pressure drop (mH2O)
WATER FLOW RATE (l/h)
Graph 1.1
0601_2008
120 kW

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17 910.026.1 - EN (AUS)
ISTRUCTIONS PERTAINING TO THE INSTALLER
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
11.1 CONNECTOR WITH B23 TYPE
Figure 7
CT_0809 / 0902_2705
CT0667 / 0903_1601
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

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18 910.026.1 - EN (AUS)
ISTRUCTIONS PERTAINING TO THE INSTALLER
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.
The kit is used to introduce combustion air from outside the installation area and comprises a hose to be
installed in the venturi body.
Please consult the instructions supplied with the kit.
For air ducts (diameter and length), see the kit manual.
11.2 CONNECTOR WITH C53 TYPE
CT_0813 / 0903_0601

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19 910.026.1 - EN (AUS)
ISTRUCTIONS PERTAINING TO THE INSTALLER
12. MAKING THE ELECTRICAL CONNECTIONS
Electricalsafetyoftheapplianceis only guaranteed by correctgrounding,inaccordancewith the rules in force.
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

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20 910.026.1 - EN (AUS)
ISTRUCTIONS PERTAINING TO THE INSTALLER
The pumps of the heating system (P1 and P2) have to be connected to boiler terminal block following the wir-
ing of gure 9, a relay must be wired between the boiler control circuit board and the pumps.
12.2 CONNECTING THE PUMPS
Figure 9
Terminal board
Terminal board
Terminal board
Cover
Cover
0902_1202 / CT_0676
Turn the control box downward to access terminal blocks M1 and M2 used for the electrical connections by
removing the two protective covers (see gure 8).
Terminals 1-2: connections for the optional SIEMENS QAA73 temperature regulator. These connections do
not have any specic polarity.
Remove the bridge between terminals 1-2 “TA” on terminal block M1.
Read the instructions provided with the temperature regulator to ensure correct installation and programming.
Terminals 3-4: room temperature thermostat “TA”. Thermostats with integral accelerator resistor must not be
used. Check that there is no voltage across the ends of the two thermostat connection wires.
Terminals 5-6: oor temperature thermostat connection “TP” (commercially available device). Check that
there is no voltage across the ends of the two thermostat connection wires.
Terminals 7-8: connections for the optional SIEMENS QAC34 outdoor temperature sensor. Read the instruc-
tions provided with the outdoor temperature sensor to ensure correct installation.
Terminals 9-10: connections for the optional domestic hot water priority sensor, for connecting single system
boilers to external DHW boilers.
Terminals a-b (230V AC; 50 Hz; 0,5 A max; cos ϕ> 0,8): electricity supply for boiler pump.
(Feeding relay coil).
12.3 DESCRIPTION OF THE ELECTRICAL CONNECTIONS TO THE BOILER