Sime MURELLE HT 25 MET Manual

Fonderie SIME S.p.A. 6330337 - 02/2019 - R1
Cod.
USER, INSTALLATION AND SERVICING INSTRUCTIONS
MURELLE HT
Condensing wall mounted boiler
EN
TRANSLATION OF THE ORIGINAL INSTRUCTIONS

2

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 improp-
er 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 .
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
accompany the appliance in the event
the appliance is transferred or sold to
another Owner or User or is installed
on another system.
–
Installation and maintenance of this
appliance must be carried out by a
qualified company or by a profession-
ally qualified technician, or author-
ised person, in accordance with the
instructions contained in the manual.
The company or technician will, at the
end of installation operations, issue a
statement of compliance with nation-
al and local Technical Standards and
Legislation in force.

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 associ-
ated with it.
– To allow children to play with the ap-
pliance.
–To allow unsupervised children to per-
form user maintenance and cleaning.
–Do not use electrical devices or appli-
ances such as switches, electrical ap-
pliances 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.
– Do not touch the appliance with bare
feet or with any wet part of the body.
– Do not carry out any technical inter-
vention or cleaning operation before
having disconnected the appliance
from the mains power by setting the
main switch to "OFF", and closing the
gas supply.
– Do not modify the safety or adjustment
devices without authorization and in-
structions from the manufacturer.
d
IT IS FORBIDDEN
– Do not block the condensate drain (if
present).
– Do not pull, detach or twist the electri-
cal cables coming out of the appliance
even if the appliance is disconnected
from the mains power supply.
– Do not expose the boiler to atmos-
pheric agents. These boilers can also
be installed in partially covered are-
as, as per EN 15502, with a maximum
ambient temperature of 60 °C and a
minimum ambient temperature of - 5
°C. It is recommended 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 anti-
freeze function.
– Do not block or reduce the size of the
ventilation 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).
– Do not leave containers with flamma-
ble substances in the room where the
appliance is installed.
– Do not leave packaging material
around since it could be dangerous.
Therefore dispose of it as prescribed
by legislation in force.

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 (UE) N. 811/2013 - 813/2013
– Energy Labeling Directive 2010/30/CE
1312
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 damage
or cause the appliance to malfunction; these actions
therefore require particular caution and adequate
preparation.
f
ELECTRICAL HAZARD
To indicate actions which, if not carried out correct-
ly, could lead to injury of an electrical nature; these
actions therefore require particular caution and ade-
quate 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 OPERARE CON LA CALDAIA MURELLE HT 8
1.1 Pannello comandi ...............................8
1.2 Messa in funzione ...............................9
1.2.1 Verifiche preliminari.................... 9
1.2.2 Accensione ........................... 9
1.3 Impostazioni da funzione MODO ..................10
1.3.1 Acqua Calda Sanitaria ................. 10
1.3.2 Riscaldamento ....................... 10
1.3.3 Funzione vacanze ..................... 11
1.4 Segnalazione anomalia..........................12
1.5 Programmazione oraria .........................12
2 SPEGNIMENTO 13
2.1 Spegnimento temporaneo .......................13
2.2 Spegnimento per lunghi periodi...................13
3 MANUTENZIONE 14
3.1 Regolamentazioni ..............................14
3.2 Pulizia esterna.................................14
3.2.1 Pulizia della mantellatura .............. 14
4 SMALTIMENTO 14
4.1 Smaltimento dell’apparecchio (Direttiva Europea
2012/19/UE) ...................................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
bottom 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
following 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
clic
k
encoder to go to the screen to select the “
Function mode”
. Turn the encoder to select the pre-
ferred mode e.g. “Winter” (Winter)
–press the
click
encoder to confirm “Winter” (Winter)
– press the button
“ESC” to go back to the “main screen” .
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
Esc
MENU MODE ZONES
Mon 01.01.2018 10:30
Fig. 4
– open one or more of the hot water valves and check that the ap-
pliance starts up
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
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”
. Turn the encoder to select the pre-
ferred mode e.g. “Winter” (Winter)
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
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
click
encoder to confirm “Hot water” (DHW) and
open the submenu
DHW
Function Mode MAN
Hot water set 50°C
Program. Time [...]
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
Esc
Fig. 8
– press the
click
encoder to confirm the highlighted “Row”
and access the modifiable area
DHW
Function Mode MAN
Hot water set 50°C
Program. Time [...]
Fig. 9
– turn the encoder to modify the “Data/value” in the per-
mitted field (e.g. MAN - AUTO - OFF)
–press the
clic
k
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”.
1.3.2 Heating
– Turn the encoder to select “Heating”
– press the
click
encoder to confirm “Heating” (Heating) and
open the submenu
“Zone” (Zones)
Heating
Zone 1 [...]
Zone 2 [...]
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
Esc
Fig. 10
– turn the encoder to select the desired zone e.g. Zone 1
(Zone 1) or Zone 2 (Zone 2)
– press the
clic
k
encoder to confirm the highlighted zone and
go to the row
Zone 1
Information [...]
Regulation [...]
Config [...]
Fig. 11
turn the encoder to select the desired row e.g. Regula-
tion (Regulation)
Zone 1
Information [...]
Regulation [...]
Config [...]
Fig. 12

11
– press the
click
encoder to confirm the selected submenu
and access the relevant data display
Regulation room 1
Function Mode AUTO
Set AUTO comfort 20.5°C
Set AUTO reduced 17.0°C
Set MAN 19.2°C
Program. Time [...]
Room probe run Sì
Room probe modul. Sì
Ext. probe modul. Sì
Weather comp. curve 3.0
Regulation room 1
▲
Weather comp. curve 3.0
Weather comp. Offset 0°C
Request limit 0.1°C
System inertia 10
Flow Temp. max set 60°C
Flow Temp. min set 20°C
Room antifreeze enable Sì
Room antifreeze temperature 5.0°C
Room sensor adjust 0.0°C
Fig. 13
– press the
click
encoder to confirm the highlighted “Row”
and access the modifiable area
Regulation room 1
Function Mode AUTO
Set AUTO comfort 20.5°C
Set AUTO reduced 17.0°C
Set MAN 19.2°C
Program. Time [...]
Room probe run YES
Fig. 14
– turn the encoder to modify the “Data/value” in the per-
mitted field (e.g. MAN - AUTO - OFF)
–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.
1.3.3 Holiday function
This function allows the user to deactivate both heating and hot
water production during a
“set and activated” holiday period,
during which the antifreeze function can be active (if set).
To set the holiday function from the
“Main screen” :
– turn the encoder to select the
“Mode” (Mode) function
– press the encoder
click
to confirm one of the function
modes,
Summer (Summer) or Winter (Winter)
– turn the encoder to select the
“Holiday function” (Hol-
iday function)
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
Esc
Fig. 15
– press the encoder
click
to confirm the “Holiday function”
(Holiday function) and go into the modifiable area
Holiday Schedule
Hot water OFF - Heat. Off (Nofrost active)
Start:
End:
Enable holiday NO
05
20
02
02
2017
2017
15:00
15:00
DAY MONTH YEAR Hour:
Confirm
Fig. 16
– turn the encoder to modify the “Data/value” which is
highlighted
– press the
click
encoder to confirm the modification and
move to the next
“Data/value”
Holiday Schedule
Hot water OFF - Heat. Off (Nofrost active)
Start:
End:
Enable holiday NO
05
20
02
02
2017
2017
15:00
15:00
DAY MONTH YEAR Hour:
Confirm
Fig. 17
– turn the encoder to modify the “Data/value” on the ba-
sis of the holiday start date
–press the
click
encoder to confirm the modification and
move to the next
“Data/value”
– continue in this way until all the necessary modifications have
been made.
NOTE : The user must work in a CIRCULAR manner, meaning AL-
WAYS MOVING FORWARDS, even if a mistake is made.
– When all modifications have been made, turn the en-
coder to select
“Confirm” (Confirm) and press the
clic
k
en-
coder to go back to the
“Holiday function” (Holiday function)
– press the
“ESC” button to go back to the “main screen” .
MENU MODE ZONES
Mon 01.01.2018 10:30
Fig. 18

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
Contact the Technical Assistance Centre
Name: xxxxxxxx
Ph.: yyyyyyyyy
5 - Technical problem
Esc
FAULT IN PROGRESS
Reset boiler
Reset
No flame detection
Fig. 19
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
encoder to confirm.
If there is “no water in the system” (no water in the system) or
“low water pressure in the system” (low water pressure in the
system), there will be a request to fill the system and then to
confirm.
FAULT IN PROGRESS
Fill the system as per boiler's manual
instruction
2 - Low pressure
Fill
FAULT IN PROGRESS
Confirm operation
Confirm
Fig. 20
m
CAUTION
For a full list of faults, see "Malfunction codes and
possible 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 COM-
FORT 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. 21
– turn the encoder to select the “Single days” or the
“Group of days”
– press the
clic
k
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. 22
– 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. 23
– 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” .
Lun 1 Gen 2018 10:30Zona
Acqua calda 48°C eco
Inverno automatico - set 20.0°C fino alle 7.30
Menu Modo
Fig. 24

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”
. Turn the encoder to select “OFF”
– press the
click
encoder to switch the boiler off.
Summer Winter Off
DHW MAN 40
°C
Heating AUTO 20
°C
Holiday function OFF
Esc
Fig. 25
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. 26
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 shut-
down” section
– set the main system switch to "OFF"
OFF
Fig. 27
– 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 pro-
cedure 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
MAINTENANCE MANUAL.
3.2 External cleaning
a
WARNING
– Should it be necessary to access the areas in the
bottom 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 Di-
rective 2012/19/EU)
Boilers and electrical and electronic applianc-
es from private households must not be dis-
posed of as unsorted municipal waste at the
end of their life. Instead, they must be taken
to specific return and collection facilities, as
per Directive 2012/19/EU and Italian Legisla-
tive Decree 49/2014. For more information on
authorised collection facilities, please contact
your local council or retailer. Individual coun-
tries may also define specific rules on how to
handle electrical and electronic waste. Before
disposing of your appliance, please check the
rules in force in your country.
d
IT IS FORBIDDEN
dispose of the product with urban waste.

15
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS
5 DESCRIZIONE DELL'APPARECCHIO 16
5.1 Caratteristiche.................................16
5.2 Dispositivi di controllo e sicurezza ................16
5.3 Identificazione .................................16
5.3.1 Targa tecnica......................... 17
5.4 Struttura......................................18
5.5 Caratteristiche tecniche .........................19
5.6 Circuito idraulico di principio .....................20
5.7 Sonde ........................................20
5.8 Vaso di espansione .............................21
5.9 Pompa di circolazione...........................21
5.10 Pannello comandi ..............................22
5.11 Schema elettrico ...............................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 wa-
ter production. The main design choices made by
Sime for the
MURELLE 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 wa-
ter 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
temperature varies on the basis of the external temperature
according to a selected optimal climatic curve providing sig-
nificant energy 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 val-
ue set under parameter "PAR 7" and, where there is an exter-
nal 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 parame-
ters with error code display when the fault occurs. This makes
repair 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 (SR)
– 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 sav-
ings 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 specification, appliance
performance and any other information required by law.
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. 28

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. 29
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. 30

19
5.5 Technical features
DESCRIPTION
MURELLE HT
25 30 35
CERTIFICATIONS
Country of intended installation IT - ES - PT - EN - FR - DE - NL - CZ
Fuel G20 / G31
PIN number 1312CS6249
Category II2H3P
Appliance classification B23P - B53P - C13 - C33 - C43 - C53 - C83 - C93
Class NO
x (*) 6 (< 56 mg/kWh)
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 13,9 / 9,7 17,9 / 12,6 19,4 / 13,8
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 AAA
Heating seasonal energy efficiency %93 93 93
Sound power dB(A) 55 57 57
DOMESTIC HOT WATER
Domestic hot water energy efficiency class AAA
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 15502-1:2015
(**) 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 15502-1:2015
(**) 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. 31
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 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.