SCHUSTER BWA R50 Datasheet

INSTALLATION AND SERVICING MANUAL
R 50 R 70
BWA
R 50 R 70

2

Installation Instructions Technical Features General information
Maintenance instructions
4 MAINTENANCE INSTRUCTIONS......................................................................................................................................30
4.1 Inspection and maintenance instructions.................................................................................................................30
4.3 Adaptation to the use of other gas ..........................................................................................................................32
4.4 Operation parameters programming........................................................................................................................33
4.5 Wiring diagram.........................................................................................................................................................35
4.6 Error codes ..............................................................................................................................................................36
3 INSTALLATION INSTRUCTIONS .......................................................................................................................................14
3.1 General warnings......................................................................................................................................................14
3.2 Installation standards ................................................................................................................................................14
3.3 Preventive system verication and adjustment operations .......................................................................................14
3.4 Packaging .................................................................................................................................................................15
3.5 Positioning the boiler.................................................................................................................................................16
3.6 Flue gas exhaust pipe connection.............................................................................................................................17
3.7 Connections ..............................................................................................................................................................21
3.8 Filling the system ......................................................................................................................................................22
3.9 Electrical connections ..............................................................................................................................................23
3.10 Commissioning..........................................................................................................................................................25
3.11 Measurement of combustion efciency during installation........................................................................................26
3.11.1 Calibration function activation ........................................................................................................................26
3.11.2 Probes positioning..........................................................................................................................................26
3.12 Burner adjustment.....................................................................................................................................................27
3.12.1 Adaptation of the power to the heating system ..............................................................................................29
Attention: this manual contains instructions for the exclusive use of the professionally qualied installer and/or maintenance
technician in compliance with current legislation.
The user is NOT qualied to intervene on the boiler.
The manufacturer will not be held liable in case of damage to persons, animals or objects resulting from failure to comply
with the instructions contained in the manuals supplied with the boiler.
2 TECHNICAL FEATURES AND DIMENSIONS .....................................................................................................................9
2.1 Technical features......................................................................................................................................................9
2.2 Main components view and dimensions ....................................................................................................................9
2.3 Dimension................................................................................................................................................................10
2.4 Available ow rate / pressure diagram.....................................................................................................................12
2.5 Operation data .........................................................................................................................................................13
1 IGENERAL INFORMATION..................................................................................................................................................4
1.1 General warnings.......................................................................................................................................................4
1.2 Symbols used in the manual......................................................................................................................................5
1.3 Appropriate use of appliance .....................................................................................................................................5
1.4 IInformation for system manager ...............................................................................................................................5
1.5 Safety warnings .........................................................................................................................................................6
1.6 Technical data plate ..................................................................................................................................................7
1.7 Water treatment .........................................................................................................................................................8
1.8 Boiler antifreeze protection ........................................................................................................................................8

4
1GENERAL INFORMATION
Any repairs must be performed solely by personnel authorised
by Schuster, using original spare parts only. Failure to comply
with the above can compromise the safety of the appliance and
void the warranty.
To guarantee appliance efciency and its correct operation,
yearly maintenance must be performed by qualied personnel.
Should you decide not to use the appliance, parts entailing
potential sources of hazard must be made safe.
Before commissioning an appliance that has not been used,
wash the domestic hot water production system, making the
water ow until it has been fully replaced.
Should the appliance be sold or transferred to a new owner or
if you move and leave the appliance, always make sure that the
instruction booklet accompanies it in order to be consulted by
the new owner and/or installer.
Only original accessories must be used for all appliances with
optionals or kits (including electric).
This appliance is intended solely for the use for which it was
expressly designed.
Any other use is to be considered improper and therefore dan-
gerous (*).
1.1 -GENERAL WARNINGS
The instruction booklet is an integral and essential part of the
product and must be kept by the user.
Read the warnings contained in this instruction booklet carefully
as they provide important guidelines regarding installation, use
and maintenance safety.
Keep the booklet with care for further consultation.
Installation and maintenance must be performed in compliance
with the standards in force according to the instructions of the
manufacturer, up to standard and by personnel qualied and
certied in compliance with law.
Systems for the production of domestic hot water MUST be
constructed entirely with compliant materials.
By professionally qualied personnel we mean: personnel with
specic technical skill in the eld of heating system components
for civil use, domestic hot water production and maintenance.
Personnel must have the qualications provided for by current
legislation.
Incorrect installation or improper maintenance can cause dam-
age to persons, animals or objects for which the manufacturer
is not responsible.
Before performing any cleaning or maintenance, disconnect the
appliance from the energy mains by acting on the switch of the
system and/or through the specic cut-off devices.
Do not obstruct the terminals of the intake/exhaust ducts.
In case of failure and/or malfunctioning of the appliance, switch
it off and do not try to repair it or intervene on it directly. Contact
only personnel qualied in compliance with law.

5
1.2 -SYMBOLS USED IN THE MANUAL
Pay special attention when reading this manual to the parts marked by the symbols:
1.3 -APPROPRIATE USE OF APPLIANCE
The BWA R 50 / 70 boiler has been built according to the current level of engineering and acknowledged
technical safety rules.
Nonetheless, if improperly used, dangers could arise for the safety and life of the user and other persons
or damage to the equipment or other objects.
The appliance is designed to work in heating systems, with hot water circulation, for the production of
domestic hot water.
Any other use is considered improper.
For any damage resulting from improper use Schuster assumes no responsibility.
Use according to the intended purposes also includes strict compliance with the instructions in this manual.
The user must be instructed concerning the use and operation of his heating system, in particular:
• Deliver these instructions to the user, as well as other documents concerning the appliance inserted in the envelope
inside the packaging. The user must keep this documentation safe for future consultation.
• Inform the user about the importance of the air vents and the ue gas exhaust system, highlighting their essential
features and the absolute prohibition of modifying them.
• Inform the user concerning controlling the system’s water pressure as well as operations to restore it.
• Inform the user concerning correct temperature control, control units/thermostats and radiators for saving energy.
• Please note that, in compliance with the standards in force, the inspection and maintenance of the appliance must
be carried out in compliance with the regulations and frequency indicated by the manufacturer.
• Should the appliance be sold or transferred to a new owner or if you move and leave the appliance, always make
sure that the instruction booklet accompanies it in order to be consulted by the new owner and/or installer.
The manufacturer will not be held liable in the event of damage to persons, animals or objects resulting from
failure to comply with the instructions contained in this manual.
1.4 -INFORMATION PROVIDED TO THE USER
NOTE!
Tips
for the user
ATTENTION!
Possible dangerous
situation for the product
and the environment
DANGER!
Serious danger
to safety
and health

6
1.5 - SAFETY WARNINGS
ATTENTION!
The boiler cannot be used by children.
The boiler can be used by adults and only after having carefully read the user’s manual
Children should be supervised to ensure that they do not play or tamper with the device.
ATTENTION!
The appliance must be installed, adjusted and maintained by professionally qualied personnel, in compliance with
the standards and provisions in force. Incorrect installation can cause damage to persons, animals and objects for
which the manufacturer cannot be held responsible.
DANGER!
NEVER attempt performing maintenance or repairs on the boiler on your own initiative.
Any work must be done by professionally qualied personnel. We recommend stipulating a maintenance contract.
Insufcient or irregular maintenance can jeopardise the operating safety of the appliance and cause damage to
persons, animals and objects for which the manufacturer cannot be held responsible.
Changes to the parts connected to the boiler (once the boiler installation is complete)
Do not modify the following parts:
- the boiler
- the gas, air, water and electricity supply lines
- the ue gas pipe, the safety valve and the exhaust pipe
- the construction parts which affect the operating safety of the appliance.
Attention!
To tighten or loosen the screwed ttings, use only appropriate xed spanners.
Incompliant use and/or inappropriate tools can cause damage (e.g. water or gas leakage).
ATTENTION!
Indications for propane gas-red appliances
Make sure that the gas tank has been deaerated before installing the appliance.
For state-of-the-art tank venting, contact the LPG supplier or person qualied in compliance with the law requirement.
If the tank has not been professionally deaerated, ignition problems could arise.
In that case, contact the supplier of the LPG tank.
Smell of gas
Should a smell of gas be perceived, follow these safety guidelines:
- do not turn electric switches on or off
- do not smoke
- do not use the telephone
- close the gas shut-off valve
- air out the area where the gas leakage has occurred
- inform the gas supplier or a company specialised in installation and maintenance of heating systems.
Explosive and easily ammable substances
Do not use or store explosive or easily ammable materials (e.g. petrol, paints, paper) in the room where the ap-
pliance is installed.
ATTENZIONE!
DANGER!
Do not use the appliance as a supporting base for objects.
In particular, do not place receptacles containing liquids (Bottles, Glasses, Jars or Detergents) on top of the appliance.
If the appliance is installed inside a housing, do not insert or rest other objects inside this housing.

7
7
General information
1.6 -TECHNICAL DATA PLATE
CE marking
The CE marking certies that the boilers meet:
- The essential requirements of the gas appliance directive
(directive 2009/142/EEC)
- The essential requirements of the electromagnetic compat-
ibility directive (2004/108/EEC)
- The essential requirements of the efciency directive (92/42/
EEC)
- The essential requirements of the efciency directive (direc-
tive 2006/95/EEC)
KEY:
1 = CE monitoring body
2 = Type of boiler
3 = Boiler model
4 = Number of stars (directive 92/42 EEC)
5 = (S.N°) Serial Number
6 = P.I.N.ProductIdenticationNumber
7 = Typesofapproveduegasexhaustcongurations
8 = (NOx)NOxClass
A = Heatingcircuitcharacteristics
9 = (Pn) Effective nominal output
10 = (Pcond) Effective output in condensation
11 = (Qmax)Maximumheatoutput
12 = (AdjustedQn)Adjustedforratedheatoutput
13 = (PMS)Max.heatingoperatingpressure
14 = (Tmax)Max.heatingtemperature
B = Domestichotwatercircuitcharacteristics
15= (Qnw)Ratedheatoutputindomestichotwaterfunction(ifdifferentto
Qn)
16= (D)SpecicD.H.W.owrateaccordingtoEN625-EN13203-1
17= (Rfactor)No.oftapsaccordingtothedeclaredamountofwater(EN
13203-1)
18 = (Ffactor)No.ofstarsaccordingtothedeclaredqualityofthewater
(EN13203-1)
19 = (PMW)Max.domestichotwateroperatingpressure
20 = (Tmax)Max.domestichotwatertemperature
C = Eletricalcharacteristics
21= Electricalpowersupply
22 = Consumption
23 = Protection rating
D = Countries of destination
24 = Direct and indirect countries of destination
25 = Gas category
26 = Supply pressure
E = Factory settings
27 = Adjusted for gas type X
28 = Space for national brands

8
1.8 - BOILER ANTIFREEZE
PROTECTION ANTIFROST PROTECTION
Press the button, up to led MOFF.
1.7 - WATER TREATMENT
The treatment of the supply water allows to
prevent inconveniences and maintain the
functionality and efciency of the generator
over time.
The ideal water pH in heating systems must
be within:
To minimise corrosion, it is crucial to use
a corrosion inhibitor; in order for it to work
properly, the metal surfaces must be clean.
(see system protection ACCESSORIES sect.
in domestic price list)
ATTENTION (*) see general warnings 1.1
The heating only models are NOT suitable
for the production of water for human con-
sumption according to Ministerial Decree
D.M. 174/2004.
ATTENTION!
ANY DAMAGE TO THE BOILER CAUSED BY
THE FORMATION OF FOULING OR BY COR-
ROSIVE WATER WILL NOT BE COVERED BY
THE WARRANTY.
VALUE MIN MAX
PH 6,5 8
Hardness [°fr] 9 15
This protection can intervene only if the
electricity and gas supplies are connected.
If one of the two is not available and upon reset
11 (SR) a temperature between 2 ÷ 5°C is
detected, the appliance will behave as described
in tab. pos 2.
The heating system can be protected effectively
from frost by using antifreeze products with
inhibitor for heating systems (specific for
multidmetal)
Do not use car engine antifreeze products as
they could damage the water gaskets.
P
O
S
ANTIFREEZE FUNCTION
Power supplies 11 - SR (*) Status function
antifreeze
Actions
Electric Gas
1ON ON T < 7 °C ON - Burner and Pump ON until T > 15°C
2
ON OFF
< 2 T < 5 °C ON
Only when both the power supplies are ON:
FAULT CODE Fr (E16)
(see par. 4.6 ERROR CODES).
Ignition disabled.
OFF ON
OFF OFF
(*) Sensor 11 par. 2.2

9
9
Technical Features
BWA R 50
BWA R 70
2
2.2 - VIEW WITH THE INDICATION OF THE MAIN COMPONENTS
TECHNICAL FEATURES AND DIMENSIONS
2.1 -TECHNICAL FEATURES

10
(*) The parts shown in gray are relative to the ACS kit.
2.3 - DIMENSIONS
Front view
View from below View from above
Side view

11
11
Technical Features
KEY
N° C.E. S.E. Description
1 db SS Domestic hot water temperature
sensor (N.U.)
2 FLS Flow switch with cold water lter
(N.U.) Optional
3 VG Gas valve
4 Fd E.
ACC
/RIL
Ignition/detection electrode
(N.U.)
5Burner
6Combustion chamber (N.U.)
7 AF TF Flue gas anti-overow thermostat
(N.U.)
8Expansion vessel (N.U.)
9 FR
HT
Heat exchanger (N.U.)
10 HL TL Safety thermostat
11 Hb SR Heating temperature sensor
12 Ht P Pump (optional on BWA 50)
13 Lp DK Water deciency pressure switch
14 Boiler drain valve (N.U.)
15 Filling valve (N.U.)
16 Diverting Valve (N.U.)
17 Plate heat exchanger (N.U.)
18 FL
FH
VM Fan
19 AF
AS
PV Flue gas pressure switch (N.U)
20 Safety valve
21 Automatic by-pass (N.U.)
22 rb SRR Return temperature sensor
23 tf TLC Flue gas collector safety thermo-
stat (N.U.)
24 Aluminium Heat Exchanger/
Capacitor
25 Vent valve
26 Condensation drain trap
27 E.
RIL.
Detection electrode
28 E.
ACC.
Ignition electrode
29 Return shut-off valve (N.U.)
30 SMG Sensor Flow General (N.U.)
31 Condensation drain trap (N.U.)
32 Outlet ue inspection
33 Heatthing Controller HSCP (N.U.)
34 Gas cocks (N.U.)
35 Ignition Trasformer
36 Non return valve (N.U.)
BWA 50 70
CDomestic hot
water outlet
(only with ACS kit)
G Ingresso gas G ¾’’ G ¾’’
FCold water inlet
(only with ACS kit)
MHeating system
ow
G 1’’ G1 ¼’’
RHeating system
return
G 1’’ G1 ¼’’
Rc Filling valve (N.U.)
Sc Boiler drain (N.U.)
Svs Safety valve drain (N.U.)
Scond
Condensation drain
A Air Suction Ø 80
S Exhaust Smoke Ø 80
C.E. = ERROR CODES see par. 4.6
S.E. =WIRING DIAGRAM
KEY see par. 4.5
(N.U) Component not used

12
If the pump are determined by the installer or
designer must be sized according to the data of
the boiler and system.
It is recommended to choose a pump with
the rate and delivery head at about 2/3 of
its characteristic heating curve.
The Dt between supply and return boiler must
never be less than 15 ° K.
A) Head gain available net losses of boiler (for boilers with pump
supplied by Schuster)
B) Head losses between ow and return
(For boilers supplied without pump)
The table provides an indication the ow the pump in function of the Dt of the primary circuit.
BWA R 50 BWA R 70
Power supply in kW 49,3 68,5
Max ow rate demanded l/h (Dt 15 K) 2826 3927
Nominal ow rate request (Dt 20 K) 2120 2946
residual pressure head
BWA R 70 (1)
BWA R 50 (2) (1)
PRESSURE
LOSSES
BWA R 50
Q: water ow rate (l/h)
Pressure losses (m/H2O)
2.4 - DIAGRAM OF FLOW RATE/PRESSURE AVAILABLE FOR INSTALLATION
NOTE:
The use of a mixing header tted between the
boiler circuit and the system circuit is always advi-
sable. It becomes INDISPENSABLE if the system
requires ow rates superior to the
maximum permitted boiler ow rates, which is to
say lower than 15K.
(1) VALUES REFER TO THE MAX SPEED
(2) ONLY IF EQUIPPED WITH OPTIONAL PUMP

13
13
Technical Features
BWA R 50 c BWA R 70
Appliance category II2H3P II2H3P
Modulation Ratio 1:5 1:7
Nominal Heat Input on P.C.I. Qn kW 48,5 67,5
Minimum Heat Input on P.C.I. Qmin kW 9,6 9,6
Nominal Output (Tr 60 / Tm 80 °C) Pn kW 47,2 65,5
Minimum Output (Tr 60 / Tm 80 °C) Pn min kW 9,1 9,1
Nominal Output (Tr 30 / Tm 50 °C) Pcond kW 49,3 68,5
Minimum Output (Tr 30 / Tm 50 °C) Pcond min kW 10,3 10,3
Efciency at max. output (Tr 60 / Tm 80°C) % 97,29 97,29
Efciency at min. output (Tr 60 / Tm 80°C) % 94,9 94,9
Efciency at max. output (Tr 30 / Tm 50°C)) % 101,62 101,51
Efciency at min. output (Tr 30 / Tm 50°C) % 104,3 104,3
Rendimento al 30% del carico (Tr 30°C) % 107,33 107,33
Number of stars (according to 92/42 EEC)
Combustion efciency with nominal load % 97,80 97,41
Combustion efciency with minimum load % 98,42 98,42
Heat loss at casing with burner in operation (Qmin) % 3,61 3,61
Heat loss at casing with burner in operation (Qn) % 0,51 0,12
Stand-by losses (with ∆t 30°C) % 0,2 0,2
Flue gas temperature tf-ta (min)(**) °C 33 33
Flue gas temperature tf-ta (max)(**) °C 43,6 51,3
Flue gas mass ow rate (min) kg/h 15,9 15,9
Flue gas mass ow rate (max) kg/h 80,0 111,4
Excess λ air % 26,84 20,57
(***) CO2 (min/max) % 9,0- 9,2 9,5 - 9,5
Flue losses with burner in operation (min) % 1,58 1,58
Flue losses with burner in operation (max) % 2,20 2,59
Flue losses with burner off (depression “0”) % 0,2 0,2
Portata d’acqua alla potenza nominale (∆T 15°C) l/h 2837 3927
Portata d’acqua alla potenza nominale (∆T 20°C) l/h 2120 2946
Minimum heating circuit pressure bar 0,5 0,5
Maximum heating circuit pressure bar 6 6
Max allowable pressure of the generator bar 8 8
Water content l 3,9 3,9
Gas Consumption Natural (20 mbar) gas G 20 a Qn m3/h 5,13 7,14
Gas Consumption Natural gas (20 mbar) G 20 a Qmin m3/h 1,02 1,02
Gas Consumption G25 (supply pressure 25 mbar) Qn m3/h
Gas Consumption G25 (supply pressure 25 mbar) Qmin m3/h
Gas Consumption G31 (supply pressure 37/50 mbar) Qn kg/h 3,76 5,24
Gas Consumption G31 (supply pressure 37/50 mbar) Qmin kg/h 0,75 0,75
Max. available pressure at the chimney base Pa 40 40
Condensate production max kg/h 7,8 10,87
Emissioni
CO at Minimum Heat Input with 0% of O2 mg/kWh 19,7 19,7
NOx at Nominal Heat Input with 0% of O2 mg/kWh 68 68
NOx at Minimum Heat Input with 0% of O2 mg/kWh 37 37
NOx Weighted value according EN 15420) mg/kWh 33,9 34,68
NOx Class 5 5
Electrical Data
Voltage/Frequency electric power supply V/Hz 230/50 230/50
Fuse on main supply A (R) 4 4
Maximum absorbed output W 172 290
Minimum absorbed output W 77 145
Standby Consumption W 16 16
Insulation degree IP X4D X4D
(*) (*) Room Temperature = 20°C
(**) Temperatures detected with the unit in operation (Tr 60 / Tm 80°C)
(***) See table INJECTORS PRESSURES
 
2.5 -OPERATING DATA ACCORDING TO UNI 10348 and GENERAL FEATURES
For the adjustment data: NOZZLES - PRESSURE - DIAGRAMS - FLOW RATES - CONSUMPTION refer to the paragraph ADAP-
TATION TO OTHER TYPES OF GAS.

14
3INSTALLATION INSTRUCTIONS
ATTENTION!
This boiler is intended solely for the use for
which it was expressly designed. Any other
use is to be considered improper and there-
fore dangerous.
This boiler heats water at a temperature
lower than the atmospheric pressure boiling
temperature.
Before connecting the boiler, have professionally
qualied personnel:
a) Thoroughly wash all the piping of the sys-
tem to remove any residues or impurities
which could jeopardise proper operation
of the boiler, even from a hygienic point
of view.
b) Check that boiler is set up to oper-
ate with the available type of fuel.
This can be seen written on the package and
on the technical feature plate;
c) Check that the chimney/ue has an appropri-
ate draught, without any bottlenecks, and that
no exhausts from other appliances are insert-
ed, unless the ue has been implemented to
accommodate several utilities according to
specic standards and regulations in force.
Only after this check can the tting between
the boiler and chimney/ue be mounted;
ATTENTION!
If there is dust and/or if there are aggressive/
corrosive vapours present in the installation
room, the appliance must be protected
suitably and must be able to operate
independently from the air in the room.
ATTENTION!
Only mount the appliance on a closed wall, made
of non-ammable material, at, vertical so that the
minimum distances required for installation and
maintenance can be observed.
The boiler must be connected to a central heating
system and/or domestic hot water supply network
compatible with its efciency and output.
3.1 - GENERAL WARNINGS
3.2 - INSTALLATION STANDARDS
t must be installed by a professionally qualied technician, who
shall take the responsibility of observing all local and/or
national laws published in the ofcial journal, as well as
the applicable technical standards.

15
15
Installation Instructions
As well as the appliance, the packaging contains:
A DOCUMENTATION ENVELOPE
- User operating instructions booklet
- Instruction booklet for the installer and
maintenance engineer
- Certicate of conformity
- Gas conversion label
C - 3 rawlplugs for boiler attachment
E - Boiler support bracket
F - Condensate evacuation siphon
G - Aluminum pipe Ø 80 mm for smoke evacuation
(located inside the boiler)
BWA R 50
P
depth
L
width
(mm)
H
heigh
(mm)
Net
Weight
(kg)
Gross
Weight
(kg)
370 715 1025 50 55
BWA R 70
P
depth
L
width
(mm)
H
heigh
(mm)
Net
Weight
(kg)
Gross
Weight
(kg)
370 715 1025 58,4 64
3.4 - PACKAGING
The boiler BWA 50 / 70 c is supplied completely assembled in
a sturdy cardboard box.
After having removed the appliance from the
packaging, make sure that the supply is complete
and undamaged.
The packaging elements (cardboard box, straps,
plastic bags, etc.) must be kept out of the reach
of children as they are potential sources of
danger.
Schuster will not be held liable for damage to per-
sons, animals or objects due to failure to comply
with the instruction above.

16
Particular importance should be given to local regulations and
laws in terms of boiler room and especially the minimum distance
that must be kept clear around the boiler.
The installation must conform to the requirements contained in
the most recent regulations and laws in terms of boiler room,
installations of heating and production of hot water, ventilation,
chimneys suitable to discharge the products of combustion of
condensing boilers, and everything else applicable.
When choosing the place of the installation of the appliance,
follow the safety instructions below:
- Place the appliance in rooms protected from frost.
- Avoid installation in rooms with a corrosive or very dusty
atmosphere.
- The appliance must only be installed on a vertical and solid
wall which can support its weight.
- The wall must not be made of ammable material.
Solo con kit ACS
C CALDA
F FREDDA
Observe the minimum distances of encumbrance
in order to perform the operations of normal
maintenance and cleaning.
3.5 - POSITIONING IN
BOILER ROOM

17
17
Installation Instructions
3.6 - FLUE GAS EXHAUST PIPE CONNECTION
To connect the ue gas exhaust pipe, local and na-
tional standards must be observed
In the event the boiler is replaced, ALWAYS re-
FOR BOILERS WITH FORCED DRAUGHT
place the ue gas pipe as well.
The boiler is type approved for the exhaust congu-
rations listed below:
C13x C13
% Slope towards outlet = 3%
TOTAL LENGTH (LA intake + L Exhaust)
COAXIAL Ø60/100 DOUBLE Ø80
FROM [m] UP TO [m] FROM [m] UP TO [m]
1 5,5 1 + 1 40
(20A+20S)
COASSIALE Ø80/125 SDOPPIATO Ø60
FROM [m] UP TO [m] FROM [m] UP TO [m]
1 8 1 + 1 20
(10A+10S)
nlet pipe and flue gas
exhaust pipe: min 250
mm - max 500
Horizontal exhaust and intake terminals directed
outside via coaxial or double pipes
C33x C33
TOTAL LENGTH (LA intake + L Exhaust)
COAXIAL Ø60/100 DOUBLE Ø80
FROM [m] UP TO [m] FROM [m] UP TO [m]
1 7 0,5 + 0,5 40
(20A+20S)
COAXIAL Ø80/125 DOUBLE Ø80
FROM [m] UP TO [m] FROM [m] UP TO [m]
1 9 1 + 1 20
(10A+10S)
Vertical exhaust and intake terminals directed
outside via coaxial or double pipes..
C53x C53
C53 NOT ALLOWED C53
TOTAL LENGTH (LA intake + L Exhaust)
DOUBLE Ø80 DOUBLE Ø60
FROM [m] UP TO [m] FROM [m] UP TO [m]
1 + 1 40
(max 30 S) 1 + 1 20 (max 15 S)
Separate combustion air intake and combustion
products evacuation pipes.
These pipes can discharge into areas with different
pressure.
C43x C43
Collective chimney ue system, consisting of two
pipes, one for combustion air intake and the other
one for combustion products evacuation, coaxial
or double.

18
B23P
LUNGHEZZA TOTALE ( LScarico)
DOUBLE Ø80
UP [m] TO [m]
1 30
Connection to a combustion products evacuation
pipe outside the room; the combustion air is tak-
en directly from the room where the appliance is
installed.
C83x C83
Connection to a terminal for combustion air intake
and ue gas exhaust via a single or collective
chimney.
C93x C93
Air / ue gas through concentric pipes in the boiler
room and single pipes in the chimney (combustion
air with counterlow in the chimney)
C63x C63
Boiler intended for connection to a combustion air
intake and combustion products evacuation system,
approved and sold separately.
ATTENTION:
The ue must comply with standards
in force
CAUTION
LT total length is a reference value
for the dimensioning of the ducts of A
(intake) and S(Exhaust). Subtracting
the values of LT reported, at values of
bends* / terminals* / extensions* you
get the value:
if > 0 = OK - POSSIBLE conguration
if < 0 = NO - WRONG conguration
(*) Values in the MT018 available on the website.
Please note:
These values relate to exhausts/
made by means of rigid pipes and
smooth original Schuster
ATTENTION:
For the type of connection B23P the
room follows the same installation rules
for boilers with natural draught.

19
19
Installation Instructions
GENERAL INFORMATION ON THE FLUE GAS EXHAUST SYSTEM
1
00361255
It is recommended to only use original Schuster
exhaust pipes.
The supplier will have no contractual or ex-
tra-contractual liability for damage caused due
to incorrect installation and use and in any case
failure to comply with the instructions provided
by the manufacturer.
(+) Adapter for double systems 80/125
2 3
COAXIAL DUCT Ø 80/125

20
DOUBLE Ø 80