Sime MURELLE.HT 25 (MET) Manual

Fonderie SIME S.p.A. 6330337B - 07/2022 - R8
Cod.
USER, INSTALLATION AND SERVICING INSTRUCTIONS
MURELLE.HT
Condensing wall mounted boiler
EN
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
To consult the documentation,
visit our website www.sime.it

2
RANGE RATED CERTIFICATION
The maximum power, in heating mode, of MURELLE.HT boilers
can be adapted, during the installation, to the thermal needs
of the system by modifying the setting of PAR 19 in the
0 .. 100
range.
The setting of PAR 19 = 100 is the factory setting that allows
the boiler to deliver its maximum power in heating mode. It can
be reduced by modifying the setting of PAR 19 as shown in the
table appearing below.
Once the new setting of PAR 19 has been made, the reduced
maximum power value (kW) MUST MANDATORILY be applied
beside the boiler’s data plate. For checks and adjustments af-
ter the modification, refer to the new value for the maximum
power.
The useful nominal power levels used are those relative to the
operating conditions (80-60°C) (Pn min - Pn max).
Example for MURELLE.HT 25 boiler:
– default heating power range: 1,65 - 24,2 setting of PAR 19 = 100
– “reduced” heating power range: 1,65 - 19,7 setting PAR 19 = 80
DESCRIPTION
MURELLE.HT
25 30 35 Setting of PAR 19
Min Max Min Max Min Max
A - Factory power range (heating) kW 1,65 24,2 1,93 29,1 2,33 33,9
100
B - Reduced power ranges for maximum power
reduction (heating)
kW 1,65 21,9 1,93 26,4 2,33 30,7
90
kW 1,65 19,7 1,93 23,7 2,33 27,6 80
kW 1,65 17,4 1,93 20,9 2,33 24,4 70
kW 1,65 15,2 1,93 18,2 2,33 21,3 60
kW 1,65 12,9 1,93 15,5 2,33 18,1 50
kW 1,65 10,7 1,93 12,8 2,33 15,0 40
Boiler technical data plate Range Rated label
A
B
A Factory power range
B Reduced power range for maximum power reduction
m
CAUTION
The grey fields must be filled in by the installer.

3
SAFETY WARNINGS AND REGULATIONS
m
WARNINGS
– After having removed the packaging
make sure that the product supplied is
integral and complete in all its parts. If
this is not the case, please contact the
Dealer who sold the appliance.
– The appliance must be used as intend-
ed by
Sime who is not responsible for
any damage caused to persons, ani-
mals or things, improper installation,
adjustment, maintenance and improper
use of the appliance.
– In the event of water leaks, disconnect
the appliance from the mains pow-
er supply, close the water mains and
promptly inform professionally quali-
fied personnel.
– Periodically check that the operating
pressure of the water heating system
when cold is
1-1.2 bar . If this is not the
case, increase the pressure or contact
professionally qualified personnel.
– If the appliance is not used for a long
period of time, at least one of the fol-
lowing operations must be carried out:
-
set the main system switch to "OFF";
- close the gas and water valves for the
water heating system.
– In order to ensure optimal appliance
operations Sime recommends that
maintenance and checks are carried
out ONCE A YEAR .
– If the power cable is damaged, replace
it with a cable ordered as a spare part
with the same characteristics (type X).
Assembly must be by carried out by a
qualified professional.
m
WARNINGS
– It is recommended that all operators read
this manual carefully in order to use the
appliance in a safe and rational manner.
–
This manual is an integral part of the
appliance. It must therefore be kept for
future reference and must always ac-
company the appliance in the event the
appliance is transferred or sold to an-
other Owner or User or is installed on
another system.
–
Installation and maintenance of this ap-
pliance must be carried out by a qual-
ified company or by a professional-
ly qualified technician in accordance
with the instructions contained in the
manual. Once the work is complete,
the company or technician will issue a
declaration of conformity with national
and local technical standards and legis-
lation in force in the country where the
appliance will be used.
–
Any repairs on the appliance must be
carried out solely by professional-
ly qualified personnel, using original
spare parts only. Failure to comply with
these instructions can jeopardise the
appliance’s safety and void the warranty
with immediate effect.
–
Fonderie SIME S.p.A. reserves the right
to make improvements to its products
at any time without prior notice, without
compromising their essential charac-
teristics. The graphic illustrations and/
or images in this document may show
optional accessories that vary accord-
ing to the country in which the appli-
ance is used.

4
RESTRICTIONS
d
IT IS FORBIDDEN
– To allow children under the age of 8 to
use the appliance. The appliance can
be used by children no younger than
8 years old, by people with physical or
cognitive disabilities, and by people
lacking experience or the necessary
knowledge, provided that they are su-
pervised or have been instructed on
how to use the appliance safely and that
they understand the risks associated
with it.
– To allow children to play with the appli-
ance.
–To allow unsupervised children to per-
form user maintenance and cleaning.
–To use electrical devices or appliances
such as switches, electrical appliances
etc if you can smell fuel. If this should
happen:
-
open the doors and windows to air the
room;
- close the gas isolation device;
- promptly call for professional assis-
tance.
– To touch the appliance with bare feet or
with any wet part of the body.
– To carry out any technical intervention
or cleaning operation before having
disconnected the appliance from the
mains power by setting the main switch
to "OFF", and closing the gas supply.
– To modify the safety or adjustment de-
vices without authorization and instruc-
tions from the manufacturer.
d
IT IS FORBIDDEN
– To block the condensate drain (if pres-
ent).
– To pull, detach or twist the electrical ca-
bles coming out of the appliance even if
the appliance is disconnected from the
mains power supply.
– To expose the boiler to atmospheric
agents. These boilers can also be in-
stalled in partially covered areas, as per
EN 15502, with a maximum ambient
temperature of 60 °C and a minimum
ambient temperature of - 5 °C. It is rec-
ommended that the boiler is installed
below weathered roofs, on the balcony
or in a protected niche, to protect it from
exposure to weathering agents (rain,
hail and snow). The boiler is equipped
as standard with an antifreeze function.
– To block or reduce the size of the venti-
lation openings of the room where the
appliance is installed, if present.
– Remove the mains power and gas sup-
ply from the appliance if the external
temperature could fall below ZERO
(risk of freezing).
– To leave containers with flammable
substances in the room where the ap-
pliance is installed.
–To dispose of the packaging materi-
al irresponsibly as it could be danger-
ous. Packaging must be disposed of as
specified by the legislation in force in
the country where the appliance will be
used.

5
RANGE
MODEL CODE
MURELLE.HT 25 (MET) 8115101
MURELLE.HT 25 (GPL) 8115106
MURELLE.HT 30 (MET) 8115102
MURELLE.HT 30 (GPL) 8115107
MURELLE.HT 35 (MET) 8115103
MURELLE.HT 35 (GPL) 8115108
COMPLIANCE
Our company declares that MURELLE.HT boilers comply with the
following directives:
– Gas Appliances EU Regulation 2016/426
– Boiler Efficiency Directive 92/42/EEC
– Low Voltage Directive 2014/35/EU
– Electromagnetic Compatibility Directive 2014/30/EU
– Ecodesign Directive 2009/125/EC
– Regulation (EU) No. 811/2013 - 813/2013
– Energy labelling Regulation (EU) No. 2017/1369
Please refer to the technical data plate for the serial number and
year of manufacture.
SYMBOLS
a
WARNING
To indicate actions which, if not carried out correctly,
can result in injury of a general nature or may dam-
age or cause the appliance to malfunction; these ac-
tions therefore require particular caution and adequate
preparation.
f
ELECTRICAL HAZARD
To indicate actions which, if not carried out correctly,
could lead to injury of an electrical nature; these ac-
tions therefore require particular caution and adequate
preparation.
d
IT IS FORBIDDEN
To indicate actions which MUST NOT BE carried out.
m
CAUTION
To indicate particularly important and useful informa-
tion.
MANUAL STRUCTURE
This manual is organized as follows.
USER INSTRUCTIONS
TABLE OF CONTENTS 7
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS 15
INSTALLATION AND SERVICING
INSTRUCTIONS
TABLE OF CONTENTS 25

6

7
USER INSTRUCTIONS
TABLE OF CONTENTS
1 USING THE BOILER MURELLE.HT 8
1.1 Control panel ...................................8
1.2 Start-up .......................................9
1.2.1 Preliminary checks..................... 9
1.2.2 Ignition............................... 9
1.3 Settings using the MODE function .................10
1.3.1 Domestic hot water ................... 10
1.3.2 DHW 3-star function................... 10
1.3.3 Heating ............................. 11
1.4 Fault warnings.................................12
1.5 Time Programming .............................12
2 SHUTDOWN 13
2.1 Temporary shutdown............................13
2.2 Shutting down for long periods ...................13
3 MAINTENANCE 14
3.1 Adjustments...................................14
3.2 External cleaning...............................14
3.2.1 Cleaning the cladding.................. 14
4 DISPOSAL 14
4.1 Disposal of the equipment (European Directive
2012/19/EU) ...................................14

8
1 USING THE BOILER MURELLE.HT
1.1 Control panel
Menu ZonaModo
25
25
0
10 B12 11 C
43 5 6 7 8 9 A
25
1 2
13
14
2
15
1
16
20
1517
1918
1718
16
1521 22
23
Fig. 1
A “ESC” button: go back to the previous screen
LOCKOUT NOTIFICATION: when the boiler is locked, the button
lights up red
B MULTI-FUNCTION ENCODER: turn to navigate the menu, press
to confirm the selection
C DISPLAY
1
WiFi
2 Alarm symbol
3 Remote control, where relevant
4 Solar manifold temperature
5 DHW temperature
6 Date
7 Boiler delivery temperature
8 Room humidity level
9 Time
10 System pressure
11 Measured outdoor temperature
12 Presence of external sensor (SE)
13 Heating circuit “1” heat request active
14 Heating circuit “2” heat request active
15 Burner active
16 Burner modulation percentage
17 Domestic hot water circuit heat request active
18 Heat pump request in cold mode active
19 Heat pump active
20 Heat pump modulation percentage
21 Chimney sweep function active
22 Chimney sweep function modulation percentage
23 Programming connector
m
CAUTION
Remove the protective film on the display after the ap-
pliance is used for the first time.

9
1.2 Start-up
1.2.1 Preliminary checks
a
WARNING
– Should it be necessary to access the areas in the bot-
tom part of the appliance, make sure that the system
components and pipes are not hot (risk of burning).
– Before replenishing the heating system, put on pro-
tective gloves.
Commissioning of the
MURELLE.HT boiler must be carried out by
professionally qualified Personnel after which the boiler can op-
erate automatically. It may however be necessary for the User to
start the appliance autonomously without involving a technician:
for example, after a holiday . In these cases certain checks and
the following operations must be carried:
– check that the gas isolation and water system valves are open
– using a pressure gauge (1), check that the heating system
pressure when cold is
1-1.2 bar . If this is not the case, open the
filling valve (2) and restore the heating system pressure until
the pressure gauge (1) shows a reading of 1-1.2 bar
– close the filling valve (2).
1
2
Fig. 2
1.2.2 Ignition
After having carried out the preliminary checks, perform the fol-
lowing to start the boiler:
– set the main system switch to "ON"
– after a few seconds, the “Main screen” is shown
ON
Menu Mode Zones
Mon 01.01.2018 10:30
Fig. 3
– turn the encoder to select the “Mode” (Mode) function
– press the
click
encoder to go to the screen to select the “
Function mode”
(MODE). Turn the encoder to select the
preferred mode e.g. “Winter” (Winter)
– press the
click
encoder to confirm “Winter” (Winter)
– press the “ESC” button to go back to the “main screen”.
Summer Winter Off
Hot water MAN 40
°C
Heating
Esc
Menu Mode Zones
<<strdata>> 10:30
Fig. 4
– open one or more of the hot water valves and check that the
appliance starts up
Summer Winter Off
Hot water MAN 40
°C
Heating
Esc
Fig. 5
– allow the appliance to operate until hot water is produced and
shut off the valves opened previously.

10
1.3 Settings using the MODE function
From the “Main screen”:
Menu Mode Zones
Mon 01.01.2018 10:30
Fig. 6
– turn the encoder to select the “Mode” (Mode) function
– press the
click
encoder to go to the screen to select the “
Function mode”
(MODE). Turn the encoder to select the
preferred mode e.g. “Winter” (Winter)
Summer Winter Off
Hot water MAN 40
°C
Heating
Esc
Fig. 7
– press the
click
encoder to confirm the highlighted “Mode”
and go to the “rows”
1.3.1 Domestic hot water
– turn the encoder to select “Hot water” (DHW)
– press the
clic
k
encoder to confirm “Hot water” (DHW) and
open the submenu
Hot water
Function Mode MAN
Zone heating 45°C
Program. Time [...]
Summer Winter Off
Hot water MAN 40
°C
Heating
Esc
Fig. 8
– press the
click
encoder to confirm the highlighted “Row” and
access the modifiable area
Hot water
Function Mode MAN
Hot water setting 45°C
Program. Time [...]
Fig. 9
– turn the encoder to modify the “Data/value” in the per-
mitted field (e.g. OFF - ECO - MAN - AUTO)
– press the
click
encoder to confirm any modifications made
and go back to the row “Function mode” (Function Mode).
The characteristics of each operating mode available are de-
scribed below:
Function mode Description
OFF DHW (domestic hot water) request NOT
active
ECO Instantaneous operation (factory setting)
MAN DHW 3-star function ALWAYS active (with
PAR 37 = 1)
AUTO_ON MAN mode operation when the time slot
has been activated
AUTO_OFF ECO mode operation when the time slot
has been deactivated
m
CAUTION
For information on boiler time programming, see “
Time Programming”.
1.3.2 DHW 3-star function
This function is included on boiler models with instantaneous hot
water function, with PAR 47 = 1 the function activates when MAN
or AUTO mode is set in the ON bands.
Moreover, this function:
– is activated if, during a domestic hot water (DHW) request, the
burner turns on for more than 5 seconds
– the function keeps the burner active (at minimum power) at the
end of the DHW request, depending on the temperature of the
primary heat exchanger
– the function has a maximum duration of 1 hour
– the total execution time is reloaded only if the 3-star function is
interrupted by a DHW request
– if the 3-star function is interrupted by a heat request from the
heating circuit, or by a request with higher priority, the function
will be deactivated.
m
CAUTION
When the "DHW 3-star" function is activated, it is rec-
ommended to set the "Hot water set" to a value below
45°C to prevent excessive temperatures when water
starts being drawn.
m
CAUTION
Setting of the remote control SIME HOME PLUS: to dis-
able the DHW 3-star function (enabling in ECO mode),
set the domestic hot water (DHW) function to AUTO
mode and disable the MON-SUN period for all time
bands.

11
1.3.3 Heating
– Turn the encoder to select “Heating” (Heating)
– press the
clic
k
encoder to confirm “Heating” (Heating) and
open the submenu “Zone” (Zones)
Heating
Zone 1 [...]
Zone 2 [...]
Summer Winter Off
Hot water MAN 40
°C
Heating
Esc
Fig. 10
– turn the encoder to select the desired zone e.g. Zone 1
(Zone 1) or Zone 2 (Zone 2)
– press the
click
encoder to confirm the highlighted zone and
go to the row
Zone 1
Information [...]
Settings [...]
Config [...]
Fig. 11
Turn the encoder until selecting the desired function, e.g.
Settings
Zone 1
Information [...]
Settings [...]
Config [...]
Fig. 12
– press the
click
encoder to confirm the selected submenu
and access the relevant data display
Room 1 - Settings
Function Mode AUTO
Set AUTO comfort 20.5°C
Set AUTO reduced 17.0°C
Set MAN 19.2°C
Program. Time [...]
Fig. 13
– press the
click
encoder to confirm the highlighted “Row” and
access the modifiable area
Room 1 - Settings
Function Mode AUTO
Set AUTO comfort 20.5°C
Set AUTO reduced 17.0°C
Set MAN 19.2°C
Program. Time [...]
Fig. 14
– turn the encoder to modify the “Data/value” in the per-
mitted field (e.g. OFF - ECO - MAN - AUTO)
– press the
click
encoder to confirm any modifications made
and go back to the row
“Function mode” (Function Mode).
m
CAUTION
For information on boiler time programming, see “
Time Programming”.
m
CAUTION
The settings described above must be done for both
zones.

12
1.4 Fault warnings
If a fault occurs, the screen “Anomaly in progress” (Fault in pro-
gress) will appear in place of the “main screen”. For the main
fault codes, a brief description and suggestions for the user
are displayed, based on the seriousness and the frequency with
which the fault reappears.
Fault in progress
ALL 05 - Flow sensor fault
Esc
Fault in progress
Reset
ALL 06 - No flame detection
Fig. 15
The fault may be transient (volatile) or it may cause an appliance
block .
To restore normal operating conditions:
– if the fault is transient, eliminate the cause of the fault
– if the fault causes a block, eliminate the cause of the fault and
then press the
“RESET” (Reset) button; press the en-
coder to confirm.
Fault in progress
ALL 02 - Low system water pressure
Fill
Fault in progress
Confirm operation
Confirm
Fig. 16
m
CAUTION
For a full list of faults, see "Malfunction codes and pos-
sible solutions".
1.5 Time Programming
The control panel allows up to a maximum of four daily time
bands to be managed for the domestic hot water function and the
heating function described below.
During the programmed time band, the boiler works in COMFORT
heating mode, while outside the programmed time band it works
in REDUCED heating mode:
– press the encoder
click
to confirm “Program. Time” (Pro-
gram. Time) and go into the modifiable area
Confirm
Heating Time Program
0246 81 01 21 41 61 82 02 22 4
[1] 06:00 - 08:00
[2] 11:00 - 13:00
[3] -
[4] 18:00 - 23:00
MondayDay/s
Fig. 17
– turn the encoder to select the “Single days” or the
“Group of days”
– press the
click
encoder to confirm the required selection and
access the first “Adjustable time” [1]
Heating Time Program
0246 81 01 21 41 61 82 02 22 4
[1] 06:00 - 08:00
[2] 11:00 - 13:00
[3] -
[4] 18:00 - 23:00
MondayDay/s
Confirm
Fig. 18
– turn the encoder to modify the “Data/value” on the ba-
sis of the required time
– press the
click
encoder to confirm the modification and move
to the next “Data/value”
Heating Time Program
0246 81 01 21 41 61 82 02 22 4
[1] 06:00 - 08:00
[2] 11:00 - 13:00
[3] -
[4] 18:00 - 23:00
MondayDay/s
Confirm
Fig. 19
– continue in this way until all the necessary modifications have
been made for each day of the week or group of days.
NOTE : The user must work in a CIRCULAR manner, meaning AL-
WAYS MOVING FORWARDS, even if a mistake is made.
m
CAUTION
If NO time band is required, set the start and stop times
of that band to the same value (e.g. [3] 14:00-14:00).
– When all modifications have been made, turn the en-
coder to select
“Confirm” (Confirm) and press the
click
en-
coder to go back to “Single days” or “Groups of days”
– press the
“ESC” button to go back to the “main screen”.
Menu Mode Zones
Mon 01.01.2018 10:30
Fig. 20

13
2 SHUTDOWN
2.1 Temporary shutdown
If the user wishes to interrupt boiler operation temporarily:
– turn the encoder to select the
“Mode” (Mode) function
– press the
click
encoder to go to the screen to select the “
Function mode”
(MODE). Turn the encoder to select
“OFF”
– press the
click
encoder to switch the boiler off.
Summer Winter Off
Hot water MAN 40
°C
Heating
Esc
Fig. 21
f
ELECTRICAL HAZARD
The boiler will still be powered.
If the user is away temporarily, for a weekend, short trip etc and
if the outside temperature is at ZERO:
– set the main system switch to "OFF"
– close the gas valve.
OFF
Fig. 22
2.2 Shutting down for long periods
If the boiler is to be left unused for a long period, the following
operations need to be carried out:
– switch off the boiler as specified in the “Temporary shutdown”
section
– set the main system switch to "OFF"
OFF
Fig. 23
– close the gas valve
– close the heating and domestic hot water isolation valves
– drain the heating and domestic hot water system if there is the
risk of freezing.
m
CAUTION
Contact the Qualified Technical Personnel if the proce-
dure described above cannot be easily carried out.

14
3 MAINTENANCE
3.1 Adjustments
For the appliance to operate correctly and efficiently it is recom-
mended that the User calls upon the services of a Professionally
Qualified Technician to carry out
ANNUAL maintenance.
m
CAUTION
Maintenance interventions must ONLY be carried out by
professionally qualified personnel who will follow the
indications provided in the INSTALLATION AND MAIN-
TENANCE MANUAL.
3.2 External cleaning
a
WARNING
– Should it be necessary to access the areas in the bot-
tom part of the appliance, make sure that the system
components and pipes are not hot (risk of burning).
– Before performing any maintenance, put on protec-
tive gloves.
3.2.1 Cleaning the cladding
When cleaning the cladding, use a cloth dampened with soap and
water or alcohol for stubborn marks.
d
IT IS FORBIDDEN
to use abrasive products.
4 DISPOSAL
4.1 Disposal of the equipment (European Direc-
tive 2012/19/EU)
At the end of their life span, the appliance and
electrical and electronic devices coming from
households or classifiable as household waste
must be delivered to appropriate waste collec-
tion systems, in accordance with the law and
with Directive 2012/19/EU. This product was
designed and manufactured for minimising
its impact on the environment and on human
health, but it contains components that could be
detrimental if managed improperly. The symbol
(crossed-out wheelie bin) depicted here and also
appearing on your appliance means that the ap-
pliance at the end of its life must be managed in
accordance with the law and treated as electri-
cal and electronic waste. Before delivering the
appliance for its disposal, consult the applica-
ble provisions of the laws in force in the country
where the appliance is used and get information
on the authorised waste disposal facilities by
contacting the relevant local offices.
d
IT IS FORBIDDEN
dispose of the product with urban waste.

15
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS
5 DESCRIPTION OF THE APPLIANCE 16
5.1 Characteristics ................................16
5.2 Check and safety devices ........................16
5.3 Identification ..................................16
5.3.1 Technical Data Plate................... 17
5.4 Structure .....................................18
5.5 Technical features ..............................19
5.6 Main water circuit ..............................20
5.7 Sensors.......................................20
5.8 Expansion vessel ...............................21
5.9 Circulation pump ...............................21
5.10 Control panel ..................................22
5.11 Wiring diagram ................................23

16
5 DESCRIPTION OF THE APPLIANCE
5.1 Characteristics
MURELLE.HT are last generation condensing wall mounted boil-
ers which Sime has produced for heating and domestic hot water
production. The main design choices made by Sime for the MUR-
ELLE.HT
boilers are:
– the total pre-mix microflame burner combined with a steel
heat exchanger for heating and a rapid heat exchanger for DHW
– the sealed combustion chamber which can be classified "Type
C" or "Type B" in relation to the room where the boiler is in-
stalled, depending on the smoke outlet configuration adopted
during installation
– the command and control microprocessor electronic board
provides efficient management of both heating and hot water
production. It can also be connected to a remote control with
an Open Therm protocol or to room thermostat and/or external
sensor. If connected to an external sensor, the boiler tempera-
ture varies on the basis of the external temperature according
to a selected optimal climatic curve providing significant ener-
gy and economic savings.
Other special features of the
MURELLE.HT boilers are:
– the anti-freeze function which activates automatically if the
temperature of the water inside the boiler falls below the value
set under parameter "PAR 7" and, where there is an external
sensor, if the external temperature falls below the value set
under parameter "PAR 8"
– the anti-blocking function of the pump and diverter valve, this
activates automatically every 24 hours if no request for heat
has been made
– the chimney sweep function lasts 15 minutes and makes the
job of the qualified technician easier when measuring the pa-
rameters and combustion efficiency
– domestic hot water comfort function which allows the time
necessary for the hot water to become available to be reduced
and ensures that the temperature is stable
– screen display of the operating and self-diagnostic parameters
with error code display when the fault occurs. This makes re-
pair interventions easier and allows appliance operation to be
restored correctly.
5.2 Check and safety devices
The MURELLE.HT boilers are equipped with the following check
and safety devices:
– thermal safety thermostat 100°C
– 3 bar relief valve
– heating water pressure transducer
– delivery sensor
– return sensor
– DHW sensor
– smoke flue gas probe.
d
IT IS FORBIDDEN
To commission the appliance with safety devices which
do not work or which have been tampered with.
a
WARNING
Safety device may only be replaced by professional
qualified personnel using Sime original spare parts.
5.3 Identification
The MURELLE.HT boilers can be identified by means of:
1 Packaging label: this is located on the outside of the packag-
ing and provides a code, the serial number of the boiler and
the bar code.
2 Energy Efficiency Label: this is positioned on the outside of the
packaging to notify the User of the level of energy savings and
reduced environmental pollution produced by the appliance.
3 Technical Data Plate: this is located inside the front panel of
the boiler and provides the technical data, appliance perfor-
mance information and any other information required by law
in the country where the appliance will be used.
1
3
1
I II
A
B
C
D
E
F
G
2015 811/2013
Cod. 6244745
dB
kW
A++
A+
A
B
C
D
E
F
G
2
2


 




 











       
       

         
 
 
 

  








 






 
  
   
 
   
   


 


 
 
 

  
  
  

 

 
 

 
 

 

 
 
3
Fig. 24

17
5.3.1 Technical Data Plate


 




 











       
       

         
 
 
 

 








 






 
 
   
 
   
   


 


 
 
 

  
  
  

 

 
 

 


 

 
 
YEAR OF MANUFACTURE
SERIAL NUMBER
NAME
MAX USEFUL OUTPUT (50-30°C)
MAX OPERATING PRESSURE
MAX USEFUL OUTPUT (80-60°C)
MAX HEAT INPUT
WATER CONTENT IN BOILER
TYPE OF GAS
CODE
APPLIANCE TYPE
MAX OPERATING TEMPERATURE
MIN USEFUL INPUT (50-30°C)
MAX D.H.W. TEMPERATURE
MIN HEAT INPUT
MIN USEFUL OUTPUT (80-60°C)
APPLIANCE CLASSIFICATION
TYPE OF GAS
SUPPLY PRESSURE
MIN HEAT INPUT
NOx CLASS
GAS COUNCIL NUMBER CODE (UK)
WRAS CERTIFICATION (UK)
ELECTRICAL PROTECTION DEGREE
N° PIN
TYPE OF GAS
TYPE OF GAS
TYPE OF GAS
FLOW RATE
MAX OPERATING PRESSURE
ELECTRICAL SUPPLY
MAXIMUM ABSORBED POWER
MAX HEAT INPUT
COUNTRY OF INTENDED INSTALLTION
APPLIANCE CATEGORY
D.H.W. CONTENT
Fig. 25
m
CAUTION
Tampering with, removing or failing to display the identification plate or carrying out any other operation which does not allow
safe identification of the product or which may hinder installation and maintenance operations.

18
5.4 Structure
23
24
25
26
27
28
17
2930313233
1
2
3
4
5
6
10
9
13
11
12
14 15 16
18 20
21
22
19
8
7
1 Heat exchanger bleed point
2 Heat exchanger
3 Combustion chamber door
4 Oversleeve
5 Flame viewing window
6 Ignition/detection electrode
7 Return sensor (SR)
8 Heat safety thermostat
9 Delivery sensor
10 Condensate siphon
11 Diverter valve
12 System filling unit
13 Domestic hot water sensor
14 Control panel
15 Domestic hot water heat exchanger
16 Gas valve
17 Tap fittings cover
18 Domestic hot water filter
19 System relief valve
20 Boiler drain
21 System pump
22 Water pressure transducer
23 Automatic bleed valve
24 Fan
25 Air-gas mixer
26 Expansion vessel
27 Air inlet pipe
28 Air-smoke chamber
29 Smoke flue gas probe
30 Air inlet
31 Air inlet analysis take-off point
32 Smoke outlet
33 Take-off point for smoke analysis
Fig. 26

19
5.5 Technical features
DESCRIPTION
MURELLE.HT
25 30 35
CERTIFICATIONS
Country of intended installation IT - ES - PT - EN - FR - DE - NL - CZ - RU
Fuel G20 / G31
PIN number 1312CS6249
Category II2H3P
Appliance classification B23P - B53P - C(10)3 - C13 - C33 - C43 - C53 - C83 - C93
Class NO
x (*) 6 (< 56 mg/kWh)
DHW rated useful heat output kW 24,5 29,5 34,5
HEATING PERFORMANCE
HEAT INPUT (**)
Nominal flow (Q
n max) kW 24,5 29,5 34,5
Minimum flow G20/G31 (Q
n min) kW 1,75 / 3,5 2,1 / 4,2 2,5 / 6,0
HEAT OUTPUT
Nominal useful output G20/G31 (80-60°C) (P
n max) kW 24,2 29,1 33,9
Nominal useful output G20/G31 (50-30°C) (P
n max) kW 26,4 31,8 37,2
Minimum G20 (80-60°C) (P
n min) kW 1,65 1,93 2,33
Minimum G20 (50-30°C) (P
n min) kW 1,81 2,17 2,60
Minimum G31 (80-60°C) (P
n min) kW 3,30 3,86 5,60
Minimum G31 (50-30°C) (P
n min) kW 3,62 4,34 6,19
EFFICIENCY
Max useful efficiency (80-60°C) %98,7 98,8 98,2
Min useful efficiency (80-60°C) %94,3 91,9 93,3
Max useful efficiency (50-30°C) %107,9 107,8 107,7
Min useful efficiency (50-30°C) %103,4 103,3 103,2
Useful efficiency at 30% of load %108,6 108,5 108,6
Losses after shutdown at 50°C W95,0 101,0 113
DOMESTIC HOT WATER PERFORMANCE
Nominal heat input (Q
nw max) kW 24,5 29,5 34,5
Minimum heat input G20/G31 (Q
nw min) kW 1,75 / 3,5 2,1 / 4,2 2,5 / 6,0
Specific D.H.W. flow rate ∆T 30°C (EN 13203) l/min 11,4 14,0 16,1
Continuous D.H.W. flow rate (∆T 25°C / ∆T 35°C) l/min 14,1 / 10,1 17,0 / 12,1 19,7 / 14,1
Minimum D.H.W. flow rate l/min 222
Max (PMW) / Min Pressure bar 7 / 0,5 7 / 0,5 7 / 0,5
kPa 700 / 50 700 / 50 700 / 50
ENERGY PERFORMANCE
HEATING
Heating seasonal energy efficiency class A A A
Heating seasonal energy efficiency %93 93 93
Sound power dB(A) 51 52 53
DOMESTIC HOT WATER
Domestic hot water energy efficiency class A A A
Domestic hot water energy efficiency %82,4 82,2 80,8
Stated domestic hot water profile load XL XL XL
ELECTRICAL SPECIFICATIONS
Power supply voltage V230 230 230
Frequency Hz 50 50 50
Absorbed electrical power (Q
n max) W89 99 105
Absorbed electrical power at (Q
n min) W61 63 64
Absorbed electrical power in stand-by W 5 5 5
Electrical protection degree IP X5D X5D X5D
COMBUSTION DATA
Smoke temperature at Max/Min flow (80-60°C) °C 79,9 / 68,4 79,5 / 70,1 79,4 / 62,3
Smoke temperature at Max/Min flow (50-30°C) °C 56,4 / 52,8 54,8 / 53,0 58,1 / 51,8
Smoke flow Max/Min g/s 11,5 / 0,9 14,3 / 1,0 15,9 / 1,2
CO
2 at Max/Min flow rate (G20) %9,3 / 8,8 9,0 / 9,0 9,5 / 9,0
CO
2 at Max/Min flow rate (G31) %10,0 /10,0 10,0 / 9,7 10,3 / 10,3
NOx measured mg/kWh 38 45 45
(*) NOx class according to UNI EN 15502-1:2021
(**) Heat input calculated using the lower heat output (Hi)
Lower Heat Output (Hi)
G20 Hi. 9.45 kW/m
3
(15°C, 1013 mbar) - G31 Hi. 12.87 kW/kg (15°C, 1013 mbar)

20
DESCRIPTION
MURELLE.HT
25 30 35
NOZZLES  GAS
Number of nozzles No. 222
Nozzle diameter (G20-G31) mm 3,3 / 2,6 - 2,6 / 1,9 3,4 / 3,2 - 2,9 / 2,2 4,0 / 3,5 - 3,0 / 2,8
Gas consumption at Max/Min flow rate (G20) m
3
/h 2,59 / 0,185 3,12 / 0,22 3,65 / 0,26
Gas consumption at Max/Min flow rate (G31) kg/h 1,90 / 0,27 2,29 / 0,33 2,68 / 0,47
Gas supply pressure (G20/G31) mbar 20 / 37 20 / 37 20 / 37
kPa 2 / 3,7 2 / 3,7 2 / 3,7
TEMPERATURE  PRESSURE
Max operating temperature (T max) °C 85
Heating adjustment range °C 20÷80
Domestic hot water adjustment range °C 10÷60
Max operating pressure (PMS) bar 3
kPa 300
Water content in boiler l4,9 5,5 6,0
(*) NOx class according to UNI EN 15502-1:2021
(**) Heat input calculated using the lower heat output (Hi)
Lower Heat Output (Hi)
G20 Hi. 9.45 kW/m
3
(15°C, 1013 mbar) - G31 Hi. 12.87 kW/kg (15°C, 1013 mbar)
5.6 Main water circuit
3
5
6
14
13
15 16
18
19
10
9
8
11
17
21 20
12
7
M U G E RSc S
4
2
1
Fig. 27
KEY:
M System delivery
R System return
U Domestic hot water outlet
E Domesti hot water inlet
S Safety valve outlet
G Gas supply
Sc Condensate outlet
1 Condensing heat exchanger
2 Combustion chamber
3 Fan
4 Return sensor (SR)
5 Thermal safety thermostat
6 Delivery sensor
7 Domestic hot water heat exchanger
8 Pressure transducer
9 Automatic bleed valve
10 Pump
11 System expansion vessel
12 Diverter valve
13 Automatic by-pass
14 Domestic hot water sensor
15 Gas valve
16 Domestic hot water flow meter
17 Domestic hot water filter
18 Boiler drain
19 System relief valve
20 System filling
21 Condensate siphon outlet
5.7 Sensors
The sensors installed have the following characteristics:
– Dual sensor (thermal safety/output) NTC R25°C; 10kΩ β25°-
85°C: 3435
– domestic hot water sensor NTC R25°C; 10kΩ β25°-85°C: 3435
– External temperature sensor NTC R25°C; 10kΩ β25°-85°C:
3435
TR
0°C 1°C 2°C 3°C 4°C 5°C 6°C 7°C 8°C 9°C
Resistance R (Ω)
0°C 27279
17959
12090
8313
5828
4161
3021
2229
1669
1266
973
26135
17245
11634
8016
5630
4026
2928
2164
1622
1232
25044
16563
11199
7731
5440
3897
2839
2101
1577
1199
24004
15912
10781
7458
5258
3773
2753
2040
1534
1168
23014
15289
10382
7196
5082
3653
2669
1982
1491
1137
22069
14694
9999
6944
4913
3538
2589
1925
1451
1108
21168
14126
9633
6702
4751
3426
2512
1870
1411
1079
20309
13582
9281
6470
4595
3319
2437
1817
1373
1051
19489
13062
8945
6247
4444
3216
2365
1766
1336
1024
18706
12565
8622
6033
4300
3116
2296
1717
1300
998
10°C
20°C
30°C
40°C
50°C
60°C
70°C
80°C
90°C
100°C
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω
TR=80°C → R=1669Ω.