Sime Murelle 30 OF User manual

INSTALLER INSTRUCTIONS
CONTENTS
1DESCRIPTION OF THE BOILER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 108
2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 114
3 CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 127
4USE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 132
IMPORTANT
When carrying out commissioning of the boiler, you are highly recommended to perform the following checks:
– Make sure that there are no liquids or inflammable materials in the immediate vicinity of the boiler.
–Make sure that the electrical connections have been made correctly and that the earth wire is connected to a
good earthing system.
–Open the gas tap and check the soundness of the connections, including that of the burner.
– Make sure that the boiler is set for operation for the type of gas supplied.
–Check that the flue pipe for the outlet of the products of the combustion is unobstructed and has been properly
installed.
– Make sure that any shutoff valves are open.
– Make sure that the system is charged with water and is thoroughly vented.
–Check that the circulating pump is not locked.
–Purge the system, bleeding off the air present in the gas pipe by operating the pressure relief valve on the gas
valve inlet.
– The installer must provide the user with instruction in operation of the boiler and safety devices and hand over the
instruction booklet to the user.
FONDERIE SIME S.p.A.of Via Garbo 27 - Legnago (VR) - Italy declares that its hot water boilers, which bear the
CE mark under Gas Directive 90/396/CEE and are fitted with a safety thermostat calibrated to a maximum of
110°C, are not subject to application of PED Directive 97/23/CEE as they meet the requirements of article 1
paragraph 3.6 of the Directive.

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1.1 INTRODUCTION
“ M U R E L L E ” a r e t h e g a s f u e l l e d b u r n e r
groups for heating and the production of
hot sanitary water, constructed to satisfy
the needs of collective residential housing
and modern plant.
T h e y a r e a p p a r a t u s e s w h i c h c on f o r m t o
t h e E u r o p e a n d i r e c t i v e s 9 0 / 3 9 6 / C E ,
2004/108/CE, 2006/95/CE and
92/42/CE. The can be fuelled by natural
gas (G20) or LPG (G30-G31). This booklet
g i v e s t h e i n s t r u c t i o n s f o r t h e f o l l o w i n g
models:
– “MURELLE 25-30 OF” w i t h el e c t r o n i c
m o d u l a t i o n i g n i t i o n , o p e n c o m b u s t i o n
chamber with natural draw
– “MURELLE 25 OFT” o n l y h e a t i n g , w i t h
electronic modulation ignition, open com-
b u s t i o n c h a m b e r a n d n a t u r a l d r a w ,
which can be connected to D.H.W. stora-
ge tank .
– “MURELLE 25-30-35 BF” with electro-
nic modulation ignition, sealed combu-
stion chamber forced flow.
–“MURELLE 20-25 BFT” o n l y h e a t i n g ,
with electronic modulation ignition, sea-
l e d c o m b u s t i o n c h a m b e r a n d f o r c e d
flow, which can be connected to D.H.W.
storage tank.
The instructions given in this manual are
provided to ensure proper installation and
perfect operation of the appliance.
1 DESCRIPTION OF THE BOILER
1.2 DIMENSIONS
1.2.1 “25-30 OF” models
198 55 55 ø D
70 70 70 70 =
=
125 60
350
L
==
Fig. 1
CONNECTIONS
R C.H. return
G 3/4” (UNI-ISO 228/1)
M C.H. flow
G 3/4” (UNI-ISO 228/1)
G Gas connection
G 3/4” (UNI-ISO 228/1)
E D.H.W. inlet
G 1/2” (UNI-ISO 228/1)
U D.H.W. outlet
G 1/2” (UNI-ISO 228/1)
DIMENSIONS 25 30
L mm 400 450
D mm 130 150
1.2.2 “25 OFT” models
350
107
125 6 0
400
40 71
70 70 61
ø 130
== 198 55 55
RM G
M2
R3
G
G R
M
C
C
==
Fig. 1/a
CONNECTIONS
R C.H. return G 3/4” (UNI-ISO 228/1)
M C.H. flow G 3/4” (UNI-ISO 228/1)
G Gas connection G 3/4” (UNI-ISO 228/1)
R3 D.H.W. tank return G 3/4” (UNI-ISO 228/1)
M2 D.H.W. tank output G 3/4” (UNI-ISO 228/1)
C System loading G 1/2” (UNI-ISO 228/1)
ATTENTION: T h e “OFT” version is
designed for the connection of a
remoteboiler,touseitasaboiler
ONLY FOR HEATING it is necessary:
- to disconnect D.H.W. sensor (SB)
- set the PAR 2 to 4.
All modules are designed to be used
by qualified technical personnel.

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60 70 70
40 71
55 55
16 5
350
60
12 5
107
400
18 0
==
Fig. 1/c
1.2.4 “20 - 25 BFT” models
CONNECTIONS
R C.H. return G 3/4” (UNI-ISO 228/1)
M C.H. flow G 3/4” (UNI-ISO 228/1)
G Gas connection G 3/4” (UNI-ISO 228/1)
R3 D.H.W. tank return G 3/4” (UNI-ISO 228/1)
M2 D.H.W. tank output G 3/4” (UNI-ISO 228/1)
C System loading G 1/2” (UNI-ISO 228/1)
70 70 70 70 ==350
12 5 60
L
16 5
K
55 55
Fig. 1/b
1.2.3 “25 - 30 - 35 BF” models
CONNECTIONS
R C.H. return
G 3/4” (UNI-ISO 228/1)
M C.H. flow
G 3/4” (UNI-ISO 228/1)
G Gas connection
G 3/4” (UNI-ISO 228/1)
E D.H.W. inlet
G 1/2” (UNI-ISO 228/1)
U D.H.W. outlet
G 1/2” (UNI-ISO 228/1)
DIMENSIONS
25 30 35
L mm 400 450 450
K mm 180 205 205
ATTENTION: The “BFT” version is desi-
gned for the connection of a remote
boiler, to use it as a boiler O N LY F O R
HEATING it is necessary:
- to disconnect the D.H.W. sensor (SB)
- set the PAR 2 to 4.
All modules are designed to be used
by qualified technical personnel.

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* Gas consumption figures express the lowest calorific power of pure gas under standard conditions at 15°C – 1013 mbar; this figure may differ from the actual
figure, which is dependent on gas composition and environmental conditions.
Models 25 OF 30 OF 25 OFT 25 BF 30 BF 35 BF 20 BFT 25 BFT
Heat output
Nominal kW 23.0 27.0 23.0 23.7 28.0 32.4 19.8 23.7
Reduced kW 8.7 10.2 8.7 8.8 10.4 11.8 7.3 8.8
Heat input
Nominal kW 25.5 30.0 25.5 25.5 30.0 34.8 21.3 25.5
Reduced kW 10.2 12.0 10.2 10.2 12.0 13.5 8.5 10.2
Thermal yield 100% useful 90.0 90.0 90.0 93.0 93.3 93.1 93.0 93.0
Thermal yield useful at 30% of load 89.5 89.5 89.5 92.0 92.0 92.0 92.0 92.0
Termal efficiency (CEE 92/42 directive) ★★ ★★ ★★ ★★★ ★★★ ★★★ ★★★ ★★★
Losses after shutdown to 50°C (EN 483) W/h 200 235 200 89 96 96 89 89
Supply voltage V-Hz 230-50 230-50 230-50 230-50 230-50 230-50 230-50 230-50
Adsorbed power consumption W 75 90 80 100 115 135 105 105
Electrical protection grade IP X4D X4D X4D X4D X4D X4D X4D X4D
C.H. setting range °C 30÷80 30÷80 30÷80 30÷80 30÷80 30÷80 30÷80 30÷80
Water content boiler l 7.1 8.0 7.1 7.1 8.0 8.0 7.1 7.1
Maximum water head bar 3 3 3 3 3 3 3 3
Maximum temperature °C 85 85 85 85 85 85 85 85
Header tank capacity l7 8 7 7 8 8 7 7
Header tank pressure bar 1 1 1 1 1 1 1 1
D.H.W. setting range °C 30÷60 30÷60 - 30÷60 30÷60 30÷60 - -
D.H.W. flow rate (EN 625) l/min 10.7 12.7 - 11.1 13.2 15.3 - -
Continuous D.H.W. flow rate t 30°C l/min 10.9 12.9 - 11.3 13.4 15.5 - -
Minimum D.H.W. flow rate l/min 2.4 2.4 - 2.4 2.4 2.4 - -
D.H.W pressure min/max bar 0.2/7 0.2/7 - 0.2/7 0.2/7 0.2/7 - -
D.H.W. pressure min. nom. power bar 0.5 0.65 - 0.5 0.65 0.8 - -
Smokes temperature min/max °C 88/122 95/135 88/122 100/125 100/125 95/130 95/115 100/125
Smokes flow min/max g/s 18/20 18/20 18/20 16/16 18/18 21/21 15/15 16/16
CE certification No. 1312BS5038 1312BS5037
Category II
2H3+
II
2H3+
Type of appliance B
11BS
B
22P-52P
/C
12-32-42-52-62-82
NOx emission class 3 (<150 mg/kWh) 3 (<150 mg/kWh)
Weight when empty kg 30 33 30 38 40 40 37 37
Main burner nozzle
Quantity nozzles n ° 12 14 12 12 14 15 10 12
G20 nozzle diameter mm 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30
G30/G31 nozzle diameter mm 0.77 0.77 0.77 0.77 0.77 0.80 0.76 0.77
Gas consumption *
Natural gas (G20) m
3
/h 2.70 3.17 2.70 2.70 3.17 3.68 2.25 2.70
LPG (G30/G31) kg/h 2.01 2.37 2.01 2.01 2.37 2.74 1.68 2.01
Burner gas pressure min/max
Natural gas (G20) mbar 1.8/11.0 1.9/11.1 1.8/11.0 2.0/11.8 2.1/12.0 2.2/13.7 1.9/11.0 2.0/11.8
Butane (G30) mbar 4.7/27.7 4.8/27.7 4.7/27.7 4.8/28.5 5.0/28.5 4.5/28.2 4.8/28.5 4.8/28.5
Propane (G31) mbar 4.7/35.7 4.8/35.7 4.7/35.7 4.8/36.5 5.0/36.5 4.5/36.2 4.8/36.5 4.8/36.5
Gas supply pressure
Natural gas (G20) mbar 20 20 20 20 20 20 20 20
Butane (G30) mbar 28–30 28–30 28–30 28–30 28–30 28–30 28–30 28–30
Propane (G31) mbar 37 37 37 37 37 37 37 37
1. 3 T E C H N I CAL F E AT U R E S

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1
2
3
4
25
15
8
24
7
11
17
13
16
14
20 19
22
23
12
28
29
30
27
26
31
21
U
E
GMR
C
1.4 FUNCTIONAL DIAGRAM
Fig. 2
“25-30 OF/25-30-35 BF” models
“20-25 BFT/25 OFT” models
23
9
4
3
2
1
7
24
8
12
11
17
13
19
6
16
14
20
22
21
18
515
UEG MR
KEY
1 Fan (BF - BFT model)
2 Primary exchanger
3 Combustion chamber
4 Gas valve
5 D-H.W. exchanger with plates
6 Pressure switch valve with loading
7 C.H. sensor (SM)
8 Safety thermostat
9 D.H.W. sensor (SS)
11 Circulator with air release vent
12 Expansion vessel
13 3 BAR safety valve
14 Boiler discharge
15 Water flow meter
16 Water pressure transducer
17 Automatic bypass
18 D.H.W. filter
19 C.H. return cock (optional)
20 C.H. flow cock (optional)
21 D.H.W. cock (optional)
22 Gas cock (optional)
23 Connection plate (optional)
24 Aqua Guard Filter System
25 Motorised deviator valve
26 Filler group (optional)
27 D.H.W. storage tank BT 100 (optional)
28 Boiler discharge (optional)
29 D.H.W. sensor (SB)
30 D.H.W. expansion vessel 4 litre (optional)
31 D-H.W. safety valve 7 BAR (optional)
CONNECTIONS
U D.H.W. outlet
E D.H.W. inlet
G Gas connection
M C.H. flow
R C.H. return
C System loading

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11
10
9
8
7
6
5
4
3
2
1
1.5 MAIN COMPONENTS
Fig. 3
KEY
1 3 BAR safety valve
2 Control panel
3 Gas valve
4 Burners
5 Combustion chamber
6 Smoke chamber
7 Smoke stat
8 C.H. sensor (SM)
9 Main exchanger
10
Ignition/detection electrode
11 Coupling protection
“25 - 30 OF/25 OFT” models

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11
13
9
8
76
5
4
3
2
1
12
10
14
Fig. 3/a
KEY
1 3 BAR safety valve
2 Control panel
3 Burners
4 Combustion chamber
5 Fan
6 Combustion analysis intakes
7 Negative pressure intake
8 Positive pressure intake
9 Smoke pressure switch
10 C.H. sensor (SM)
11 Main exchanger
12 Ignition/detection electrode
13 Gas valve
14 Coupling protection
“25 - 30 - 35 BF/20 - 25 BFT” models

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The boiler must be installed in a fixed loca-
t i o n a n d o n l y b y s p e c i a l i z e d a n d q u a l i f i e d
f i r m s i n c o m p l i a n c e w i t h a l l i n s t r u c t i o n s
contained in this manual. Furthermore, the
installation must be in accordance with cur-
rent standards and regulations.
2.1 INSTALLATION
-
In the rooms where “type B” boilers are
i n s t a l l e d , t h e a i r r e q u i r e d f o r c o r r e c t
combustion of the gas consumed by the
appliance must be able to flow in. It is the-
refo re necessary to make openings that
c a n n o t b e b l o c k e d i n t h e o u t e r w a l l s ,
which must be at least 6 cm
2
for every
kW of thermal capacity installed and with,
in any case, a minimum of 100 cm
2
.
-“Type C” a p p l i a n c e s , w i t h c o m b u s t i o n
chamber and air supply sealed off from
the environment, can be installed in any
room in the house.
-“Type B and C” boilers are suitable for
functioning in a partially protected place,
as according to EN 297, with maximum
environmental temperature of 60°C and
minimum of -5°C. We recommend instal-
lation of these boilers under the protru-
ding slope of a roof, on a balcony, or in a
p r o t e c t e d n i c h e , a l w a y s p r o v i d i n g t h e y
a r e n o t d i r e c t l y e x p o s e d t o a d v e r s e
weather (rain, hail, snow). The boilers are
provided already equipped with anti-free-
ze functions.
2.1.1 Anti-freeze function
T h e b o i l e r s a r e e q u i p p e d w i t h a n t i - f r e e z e
function which activates the pumps and the
burner when the temperature of the water
c o n t a i n e d i n s i d e t h e a p p l i a n c e d r o p s t o
below 6°C. The anti-freeze function is ensu-
red, however, only if:
- the boiler is correctly connected to the
gas and electricity supply circuits;
- the boiler is constantly fed;
- the boiler ignition is not blocked;
- the essential components of the
boiler are all in working order
In these conditions the boiler is protected
a g a i n s t f r o s t d o w n t o a n e n v i r o n m e n t a l
temperature of -5°C.
ATTENTION: In the case of installation in a
place where the temperature drops below
0°C, the connection pipes must be pro-
tected.
2.2 COMPLEMENTARY
ACCESSORIES
To f a c i l i t a t e c o n n e c t i n g t h e b o i l e r t o t h e
sy st em , the fo l l owin g access ories c an be
supplied on request, complete with instruc-
tions for assembly:
- Installation plate code 8075416
- C u r v e t t e a n d g a s t a p s / s a n i t a r y w a t e r
output set code 8075418
- Taps kit code 8091806
- P o l y p h o s p h a t e s d o s e r k i t c o d e
81071700
- K i t o f c o u p l i n g s f o r r e p l a c i n g w a l l - h u n g
boilers of other makes code 8093900
- Solar kit for the instantaneous code
8105101
- H y d r a u l i c c o n n e c t i o n k i t b o i l e r
BFT/BT100 tank unit code 8091111.
2.3 CONNECTING UP SYSTEM
To protect the heat system from damaging
corrosion, incrustation or deposits, befo re
i n s t a l l a t i o n i t i s e x t r e m e l y i m p o r t a n t t o
clean the system using suitable products
s u c h a s , f o r e x a m p l e , S e n t i n e l X 3 0 0 o r
X400. Complete inst ructions are provided
with the products but, for further informa-
t i o n , y o u m a y d i r e c t l y c o n t a c t S E N T I N E L
PERFORMANCE SOLUTIONS LTD.
For long-term protection agains corrosion
and deposits, the use of inhibitors such as
Sentinel X100 is recommended after clea-
ning the system. It is important to check
the concentration of the inhibitor after
each system modification and during main-
t e n a n c e f o l l o w i n g t h e m a n u f a c t u r e r ’ s
instructions (specific tests are available at
your dealer). The safety valve drain must be
connected to a collection funnel to collect
any discharge during interventions. If the
heating system is on a higher floor than the
boiler, install the on/off taps supplied in kit
optional on the heating system
delivery/return pipes.
WA R N I NG: F ai l ur e to c l ea n th e
heat system or add an adequate
inhibitor invalidates the device’s
warranty.
Gas connections must be made in accor-
dance with current standards and regula-
tions. When dimensioning gas pipes from
the meter to the module, both capacity
volume (consumption) in m3/h and gas
density must be taken into account.
The sections of the piping making up the
system must be such as to guarantee a
supply of gas sufficient to cover the maxi-
m u m d e m a n d , l i m i t i n g p r e s s u r e l o s s
between the gas meter and any apparatus
being used to not greater than:
– 1.0 mbar for family II gases (natural gas);
– 2.0 mbar for family III gases (butane or
propane).
An adhesive data plate is sticked inside the
front panel; it contains all the technical data
identifying the boiler and the type of gas for
which the boiler is arranged.
2.3.1 Filter on the gas pipe
The gas valve is supplied ex factory with an
inlet filter, which, however, is not adequate
to entrap all the impurities in the gas or in
gas main pipes.
To prevent malfunctioning of the valve, or in
certain cases even to cut out the safety
device with which the valve is equipped,
install an adequate filter on the gas pipe.
2.5 SYSTEM FILLING
Filling of the boiler and the system is done
by the charge cock (2 fig. 4). The charge
pressure, with the system cold, must be
between 1and 1.5 bar. During system fil-
ling you are recommended to keep the main
switch turned OFF. Filling must be done
slowly so as to allow any air bubbles to be
2 INSTALLATION
Fig. 4
8
1
10 11 3 2 9 4
675
12
8
12 13 11
94
14
“25-30 OF/25-30-35 BF” models
“20-25 BFT/25 OFT” models
KEY
1 Sanitary water header
2 Fill tap
3 D.H.W. filter
4 By-pass
5 Water rate adjuster
6 D.H.W. exchanger
7 Microswitches
8 Water flow switch
9 Boiler discharge
10 D.H.W. sensor
11 Water pressure transducer
12 Safety thermostat
13 Deviator valve
14 System loading connection

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bled off through the air valves. Should the
pressure have risen well above the limit
expected, discharge the over pressure by
opening the pressure-relief valve.
N.B. The OFT/BFT versions are loaded by
means of the special coupling indicated in
figs. 1/a - 1/c
2.5.1 Emptying the system
Use the drain tap to empty the system (9
fig. 4). Turn off the boiler before doing this.
2.6 FLUES/CHIMNEYS
A chimney or flue for the evacuation of the
combustion products into the atmosphere
must correspond to the requisites prescri-
bed by the laws in force.
I n p a r t i c u l a r, t h e s p e c i f i c p r e s c r i pt io n s o f
law relative to boilers with natural draught
in collective pipes (type B) and those for boi-
lers with forced draught (type C) must be
respected.
2.6.1 Ducting of existing chimneys
To recover or duct existing chimneys, ducts
d e c l a r e d s u i t a b l e f o r t h e p u r p o s e b y t h e
manufacturer must be used, and the instal-
lation and use modalities indicated by the
s a i d m a n u f a c t u r e r m u s t a l s o b e f o l l owe d
a s w e l l a s t h e p r e s c r i p t i o n s o f S t a n d a r d
UNI 10845.
2.7 INSTALLATION OF COAXIAL
DUCT (versions "BF - BFT")
2.7.1 Accessories 60/100
The 60/100 coaxial duct is supplied on
request in kit code 8084811.
The diagrams of fig. 5 illustrate some
examples of different types of discharge
modalities allowed and the maximum
lengths that can be reached.
2.7.2 Diaphragm for 60/100
coaxial duct
The boiler is supplied with a diaphragm of
84 (version 20 BFT), 86 (versions 25-35
BF/25 BFT) and 87.5 (version 30 BF). The
diaphragms 87.5 (code 6028824) and 86
(code 6028623) can be requested separa-
tely. Use the diaphragms according to the
indications of fig. 5/a.
C12
C32
C42
3
1
2
7
6
4
3
2
8
x
y
max 5,0 m per vers. “20”
max 3,5 m per vers. "25"
max 3,0 m per vers. "30-35"
x + y = max 5,0 m per vers. "20"
x + y = max 3,5 m per vers. "25"
x + y = max 3,0 m per vers. "30-35"
KEY
1 Coaxial flue kit L. 810 code 8084811
2 a Extension L. 1000 code 8096103
2 b Extension L. 500 code 8096102
3 Vertical extension L. 200 code 8086908
4 Additional 90° curve code 8095801
6 Articulated tile code 8091300
7 Roof outlet terminal L. 1284 code 8091200
8 Vertical condensation collector L. 200 code 8092803 Fig. 5
IMPORTANT:
– E a c h a d d i t i o n a l 9 0 ° c u r v e
installed reduces the available
length by 1.0 metres.
– E a c h a d d i t i o n a l 4 5 ° c u r v e
installed reduces the available
length by 0.50 metres.
- The insertion of the condensa-
tion collector (8) is obligatory
for vertical stretches of more
than 1.3 metres.
For discharge types C12-C42, use the diaphragms supplied with the boiler:
- ø 84.0 for version “20” only when the length of the coaxial duct is less than 2 metres,
- ø 86.0 for version “25-35” only when the length of the coaxial duct is less than 1 metre,
- ø 87.5 for version “30” only when the length of the coaxial duct is less than 2 metres.
For discharge types C32, use the following diaphragms according to the length of the duct and without
additional curves:
Installations with vetrical Installations with vertical condensation
extension L. 200 code 8086908 * collector code 8092803 *
“20 BFT” models “20 BFT” models
Diaphragm Diaphragm Without Diaphragm Diaphragm Without
ø 84 ø 86 diaphragm ø 84 ø 86 diaphragm
(code 6028622) (code 6028623) (code 6028622) (code 6028623)
L max = 4 m L max = 5 m ---- L max = 3 m L max = 5 m ---
“25 BF - 25 BFT - 30 BF - 35 BF” models “25 BF - 25 BFT - 30 BF - 35 BF” models
Diaphragm Diaphragm Without Diaphragm Diaphragm Without
ø 86 ø 87,5 diaphragm ø 86 ø 87,5 diaphragm
(code 6028623) (code 6028624) (code 6028623) (code 6028624)
L max = 2.5 m L max = 4 m L max = 5 m --- L max = 2.5 m L max = 4 m
* Minimum length of duct L = 1.3 m.
Fig. 5/a

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2.7.3 Accessories 80/125
The 80 coaxial duct is supplied on request
in a kit code 8084830 complete with
assembly instructions.
Wi th the curve supplied in the kit, the maxi-
m u m h ori z o n t a l l e ng t h o f t h e d u ct m us t b e
no more than 6 metres.
The diagrams in fig. 6 show some examples
of the different types of 80/125 coaxial
discharge modalities.
2.8 INSTALLATION OF SEPARATE
DUCTS (versions “BF - BFT”)
When installing, the provisions of the laws
in force must be adhered to, as well as cer-
tain practical suggestions:
– With aspiration directly from outside,
when the duct is longer than 1 metre, it
is advisable to insulate the said duct in
order to avoid the formation of dew on
the outside of the pipe when the weather
is particularly cold.
– W i t h d u c t s w i t h d i s c h a r g e p o s i t i o n e d
outside the building, or in cold enviro n-
ments, insulation is necessary to avoid
difficulty in starting the burner. In these
cases, a condensation system on the
pipes must be provided for.
– If the pipe passes th rough inflammable
walls, insulate the stret ch of the fumes
discharge pipe that passes through the
C12
C32
C42
2
7
6
4
1
2
8
x
y
x + y = min. 3,5 m/max 6 m "25"
x + y = min. 3,0 m/max 6 m "30-35"
5
538
2
1
1
min. 3,5 m - max 6 m "25"
min. 3,0 m - max 6 m "30-35"
2
Fig. 6
KEY
1 Coaxial duct kit code 8084830
2 Extension L. 1000 code 8096130
3 Vertical extension L. 200 with coupling code 8086908
4a Additional 90° curve code 8095820
4b Additional 45° curve code 8095920
5 Adapter for 80/125 code 8095920
6 Tile for joint code 8093120
7 Terminal for roof exit L. 1284 code 8091200
8 Vertical condensation collector L. 200 code 8092803
IMPORTANT:
– Each additional 90° curve installed reduces the available length by 1.0 metres.
– Each additional 45° curve installed reduces the available length by 0.80 metres.
– The insertion of the condensation collector (8) is obligatory in C32 discharge type.
– The insertion of the condensation collector (8) is obligatory in C42 discharge type
when the stretch "y” is longer than 1.3 metres.

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wall with rounded glass wool 30 mm
thick and with a density of 50 kg/m2.
Th e ma x imu m to t al l eng th , w h i ch i s the
sum of lengths of the aspiration and
discharge pipes, is determined by the loss
of charge of the single accessories inser-
ted and must not result as more than 7.0
mm H2O in version “20” - 7.6 mm H2Oin
version “25”-9mmH
2O in version “30” -
12 mm H2O in version “35”.
For the loss of charge of the accessories,
refer to Table 1 and to the example given in
fig. 7.
2.8.1 Separate ducts kit
The separate ducts kit code 8089904 (fig.
8) is supplied with the aspiration diaph-
ragm which must be used, according to the
maximum loss of charge allowed in both
the ducts, as indicated in fig. 8/a.
To use the air intake vent in this type of
discharge, the following operations must be
carried out (fig. 9):
– Remove the base of the air inta ke vent
by cutting it with a tool (a);
Example of allowable installation “25 BF” calculation in that the sum of the head losses of the
single fittings is less than 7.6 mm H2O:
Intake Outlet
7 meter horizontal pipe ø 80 x 0.20 1.40 –
7 meter horizontal pipe ø 80 x 0.30 – 2.10
No. 2 90° elbows ø 80 x 0.35 0.70 –
No. 2 90° elbows ø 80 x 0.40 – 0.80
No. 1 wall terminal ø 80 0.15 0.50
Total head loss 2.25 + 3.40 = 5.65 mmH2O
With this total head loss, remove the segments from No. 1 to No. 7 from diaphragm in the intake
pipe.
1
2
3
4
6
Fig. 8
Fig. 8/a
Fig. 7
KEY
1 ø 125/95 sponge seal
2 Fixing screw
3 Flue outlet flange
4 Inlet air diaphragm
6 Manifold with intakes
20 25 30 35
K mm 180 180 205 205
TABLE 1
Accessories ø 80 Load loss ( mmH
2
O)
20 25 30 35
Intake Outlet Intake Outlet Intake Outlet Intake Outlet
90° curve MF 0.30 0.35 0.35 0.40 0.45 0.50 0.65 0.70
45° curve MF 0.25 0.30 0.30 0.35 0.40 0.45 0.60 0.65
E x tensi o n L . 1000 (hori z o n ta l ) 0.15 0.25 0.20 0.30 0.25 0.35 0.30 0.40
E x tensi o n L . 1000 (ve rt i c a l ) 0.15 0.05 0.20 0.10 0.25 0.15 0.30 0.20
Wall terminal 0.10 0.40 0.15 0.50 0.20 0.80 0.20 1.20
T-shaped condensation collector --- 0.70 --- 0.80 --- 1.00 --- 1.40
Roof exit terminal* 1.30 0.05 1.60 0.10 2.00 0.20 2.50 0.30
* The loss of the roof exit terminal in aspiration concludes the collector code 8091400
No. segments Total load loss mm H
2
O
to re m ove 20 25 30 35
none 0 ÷ 2.0 0 ÷ 0.8 - -
No. 1 2.0 ÷ 3.0 0.8 ÷ 1.6 - -
No.1e2 3.0 ÷ 4.0 1.6 ÷ 2.4 0 ÷ 1.0 0 ÷ 1.0
from No. 1 to 3 4.0 ÷ 5.0 2.4 ÷ 3.1 1.0 ÷ 2.0 1.0 ÷ 2.0
from No. 1 to 4 5.0 ÷ 6.0 3.1 ÷ 3.8 2.0 ÷ 3.0 2.0 ÷ 3.0
from No. 1 to 5 6.0 ÷ 7.0 3.8 ÷ 4.5 3.0 ÷ 4.0 3.0 ÷ 4.0
from No. 1 to 6 --- 4.5 ÷ 5.2 4.0 ÷ 4.8 4.0 ÷ 5.0
from No. 1 to 7 --- 5.2 ÷ 5.8 4.8 ÷ 5.6 5.0 ÷ 6.0
from No. 1 to 8 --- 5.8 ÷ 6.4 5.6 ÷ 6.4 6.0 ÷ 7.0
from No. 1 to 9 --- 6.4 ÷ 7.0 6.4 ÷ 7.2 7.0 ÷ 8.0
from No. 1 to 10 --- - 7.2 ÷ 8.0 8.0 ÷ 10.0
without diaphragm --- 7.0 ÷ 7.6 8.0 ÷ 9.0 10.0 ÷ 12.0

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– Turn the air intake vent upside down and
replace the gasket (5) with that supplied
in the kit code 8089904;
– Insert the aspiration diaphragm supplied
in the kit code 8089904, pushing it
home;
–Only for versions "20 BFT” fit onto the
diaphragm the plastic reducer supplied
together with the boiler.
Now the extension or the curve can be fit-
ted into the special seat in order to comple-
te the aspiration pipe (no washer or sealant
is necessary).
2.8.2 Outlet systems
The diagrams in fig. 9/a illust rate a num-
ber of examples of different types of sepa-
max 0,5 m
C12
B52
1
4
9
C52
B52
C32
C42
3
2
11
10
C82
B22
6
5
6
12
3
11
10
3
7
1
8
3
1
3
2
3
3 2
1
3
23 6 3
1
8 3
KEY
1 Separate flue kit code 8089904
2a 90° elbow MF (n° 6) code 8077410
2b 90° elbow MF with intake code 8077407
2c Isolated 90° elbows MF code 8077408
3a Extension L. 1000 (n° 6) code 8077309
3b Insulated e xtension L. 1000 code 8077306
3c Extension L. 500 (n° 6) code 8077308
3d Extension L. 135 code 8077304
4 Outlet terminal code 8089501
5 Int.-est. ring kit code 8091500
6 Intake terminal code 8089500
7 45° elbow MF (n° 6) code 8077411
8 Condensation outlet L. 135 code 8092800
9 Doubler fitting code 8091400
10 Tile with articulated joint code 8091300
11 Roof outlet terminal L. 1390 code 8091201
12 Tee condensation outlet code 8093300
a
b
5
Fig. 9/a
IMPORTANT: In type C52 the outlet and inlet flues must not come out on opposite walls.
ATTENTION: The three seats fore-
seen on the diaphragm allow for fit-
ting the air intake vent in only one
position (the enumeration of the
sectors faces inwards).
Fig. 9
CONFIGURATION C62: discharge and aspiration is by means of pipes available on sale and certified separately (the pressure loss in the
ducts must be calculated according to the Standard UNI EN 13394)
In vers. “20 BFT” fit the plastic
reducer supplied with the boiler in
the position indicated.

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rate outlets.
2.9 FORCED EXHAUST
(Type B22P-52P)
C o mp ly w i t h t h e f o l l o wi ng r e q u i re m e n t s
during installation:
– I n s u l a t e t h e ex h a u s t p i p e a n d i n s t a l l a
condensation collection system at the
base of the vertical pipe.
– If the pipe passes th rough combustible
walls, insulate the section of the flue pipe
passing through the wall with a 30 mm
thick fibreglass pipe covering with a den-
sity of 50 kg/m3.
In “BF-BFT” models this type of exhaust pipe
is installed using the special kit, code
8089904. For kit assembly instructions,
refer to point 2.9.1. Protect the intake with
the optional accessory, code 8089501.
The accessory is assembled by cutting a 50
mm long segment from an ordinary ø 80
extension and inserting it on the air intake,
on which the accessory is then fitted,
anchored to the pipe segment with the
screws provided (fig. 10). Kit code
8089904 is supplied with the intake diaph-
ragm, which must be used as shown in fig.
8/a, depending on the maximum permitted
flow.
Maximum fl ow resistance must be no
more than 7,0 mm H2O in vers. “20” - 7,6
mm H2O in vers. “25” - 9 mm H2O in vers.
“30” - 12 mm H2O in vers. “35”.
As the maximum pipe length is determined
by adding up the flow resistance of the
v a r i o u s i n d i v i d u a l a c c e s s o r i e s i n s t a l l e d ,
refer to Table 1 for calculation.
2.10 POSITIONING OF OUTLET
TERMINALS
T h e o u t l e t t e r m i n a l s f o r f o r c e d d r a u g h t
systems may be located on the outer walls
1) Terminals below a practicable balcony must be located in such a
way that the total path of the smoke from its outlet point from
the terminal to its outlet point from the external perimeter of the
balcony, including the height of possible railings, is not less than
2000 mm.
2) When siting terminals, where mate rials that may be subject
to the action of the combustion products are present in the
vicinity, e.g., eaves, gutters and downspouts painted or made
of plastic material, projecting timberwo rk, etc., distances of
not less than 1500 mm must be adopted, unless adequate
shielding is provided to guard these materials.
Fig. 11
cod. 8089501
Fig. 10
TABLE 2
Siting of terminal Appliances from 7 to 35 kW
(distances in mm)
A - below openable window 600
B - below ventilation opening 600
C - below eaves 300
D - below balcony (1) 300
E - from adjacent window 400
F - from adjacent ventilation opening 600
G - from horizontal or vertical soil or drain pipes (2) 300
H - from corner of building 300
I - from recess in building 300
L - from ground level or other treadable surface 2500
M - between two terminals set vertically 1500
N - between two terminals set horizontally 1000
O - from a surface facing without
openings or terminals 2000
P - as above but with openings and terminals 3000

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of the building Table 2 shows approximate,
non-binding minimum distances to be met
for a building of the type shown in fig. 11.
2.11 ELECTRICAL WIRING
If you must replace the electric power
cable supplied with the boiler, order it exclu-
sively from Sime. The power supply must be
single-phase 230V - 50 Hz through a main
switch protected by a fuse with a distance
of at least 3 mm between contacts.
NOTE: The boiler must be connected with
an efficient grounding system. SIME shall
not be held liable for injury or damage
resulting from failure to ground the boi-
ler.
ATTENTION: Before every inter-
vention on the boiler, cut off the
electricity supply by means of
the main switch of the system, since even
if the boiler is "OFF", the electrical panel
remains connected to the electricity.
2.11.1 Chronothermostat
connection
Connect the chronothermostat as indica-
ted in the boiler electrical diagram (see
para graph 2.12) after having re moved the
existing bridge.
The chronothermostat to be used must be
of a class confo r min g t o t he s ta n d a rd EN
607301 (clean electrical contact).
2.11.2 Climatic regulator CR 53
connection (optional)
The boiler is designed for connectio to a cli-
matic regulator, supplied on request (code
8092227), for the management of a hea-
ting circuit.
The electronic card will continue to manage
information visualisation, the setting of the
sanitary set and the heating of the second
c i r c u i t , a n d t h e b o i l e r p a r a m e t e r s b y
means of the keys on the control panel.
For installation and use of the climatic regu-
lator, follow the instructions included in the
packaging.
NOTE: Reset parameter 10 to 2 (PAR 10
= 2).
2.11.3 Remote control CR 73
connection (optional)
The boiler is designed for connection to a
r e m o t e c o n t r o l u n i t , s u p p l i e d o n r e q u e s t
(code 8092226).
The remote control unit CR 73 allows for
c o m p l e t e r e m o t e c o n t r o l o f t h e b o i l e r,
except release of the boiler. The boiler
display will show the following message:
For installation and use of the remote con-
trol, follow the instructions in the package.
NOTE: Ensure PAR 10 set to 1 (PAR 10 =
1).
2.11.4 External sensor connection
The boiler is designed for connection to an
e x t e rna l t e m p e r a t u r e s e n s o r, s u p p l i e d o n
request (code 8094101), which can auto-
matically regulate the temperature value of
the boiler output according to the external
t e m p e r a t u r e . F o r i n s t a l l a t i o n , f o l l o w t h e
instruction in the package. For installation,
fo llow the inst ruction in the package.
It is
possible to make corrections to the values
read by the drill acting on the PAR 11.
2.11.5 D.H.W. sensor connection in vers.
"20-25 BFT/25 OFT"
The “20-25 BFT/25 OFT” version is provi-
ded with D.H.W. sensor (SB) linked to the
connector CN5. When the boiler is coupled
to D.H.W. storage tank, introduce the sen-
sor into the special sleeve in the D.H.W.
storage tank.
ATTENTION: The “BFT/OFT” version is
designed for connection to D.H.W. stora-
ge tank, for use ONLY FOR HEATING it is
necessary:
- to disconnect the D.H.W. sensor (SB);
- set PAR 2 and 4.
All modules are designed to be used by
qualified technical personnel.
2.11.6 Use with different
electronic systems
Some examples are given below of boiler
systems combined with different electronic
systems. Where necessary, the parame-
ters to be set in the boiler are given. The
electrical connections to the boiler refer to
the wording on the diagrams (figs. 13-
13/a).Thezonevalvecontrolstartsat
every demand for heating of the zone 1 (it
is from part of the TA1 or the CR).
D e s c r i p t i o n o f t h e l e t t e r s i n d i c a t i n g t h e
c o m p o n e n t s s h o w n o n t h e s y s t e m d i a -
grams:
M System output
R System return
CR Remote control CR 73
SE External temperature sensor
TA 1-2-3-4 Zone room thermostat
CT 1-2 Zone c
hronothermostat
VZ 1-2 Zone valve
RL 1-2-3-4 Zone relay
Sl Hydraulic separator
P 1-2-3-4 Zone pump
SB D.H.W. sensor
PB D.H.W. pump
IP Floor system
EXP Expansion card (code 8092233)
VM Three-way mixer valve
RM
SE
TA
CR
TA1
CR
SE
1 BASIC SYSTEM
SYSTEM WITH A DIRECT ZONE AND ROOM THERMOSTAT,
OR WITH A CLIMATIC REGULATOR CR 53 (Code 8092227)
OR WITH REMOTE CONTROL CR 73 (Code 8092226) AND
EXTERNAL SENSOR (Code 8094101)
PARAMETERS SETTINGS
If using CR 53 set parameter
10 t o 2 (PAR10=2)

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TA 1
SE
RM
SE
TA
VZ
TA 1
VZ1
TA2
VZ2
RM
SE
TA 1 TA2
TA 1
SE
TA
P2
RL
SI
RL1 RL2
P1P
TA2
SE
RM
SE
TA
VZ
TA 1
VZ1
TA2
VZ2
CR
CR
2 BASIC SYSTEM
MULTI-ZONE SYSTEM WITH VALVE, ROOM THERMOSTAT AND EXTERNAL SENSOR (Code 8094101)
3 BASIC SYSTEM
MULTI-ZONE SYSTEM WITH PUMP, ROOM THERMOSTAT AND EXTERNAL SENSOR (Code 8094101)
4 BASIC SYSTEM
MULTI-ZONE SYSTEM WITH VALVE, ROOM THERMOSTAT, REMOTE CONTROL CR 73 (Code 8092226) AND
EXTERNAL SENSOR (Code 8094101)
PARAMETERS SETTINGS
To use the remote control
(CR) as remote control panel
for the boiler rather than as
room reference, set:
PAR 7 = 0

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TA 2
SE
RM
SE
VZ VZ1
TA 2
VZ2
CR
CR
VZ1
TA1
RM
SE
CT2
TA 1
SE
CT1
TA 2
VZ1 VZ2
ZONA
GIORNO
(70°C)
ZONA
NOTTE
(50°C)
DURING NIGHT TIME THE BOILER
USES A LOWER OUTPUT TEMPERA-
TURE IF DIFFERENT TIMES HAVE
BEEN SET FOR DAY AND NIGHT
AREAS:
-with external sensor, set the cli-
matic curve of the day zone 1 with
PAR 25 and the night zone at PAR
26.
-w i t h o u t e x te r n a l s e n s o r, ga i n
access to setting the day zone 1 by
pressing the key and change
the value with the keys and
. Gain access to setting the
night zone by pressing the key
twice and changing the value with
the keys and .
SI
RM
SE
TA1 TA2
TA2
SE
TA
P2
RL RL1 RL2
P1
P
CR
CR
5 BASIC SYSTEM
MULTI-ZONE SYSTEM WITH VALVE, ROOM THERMOSTAT, REMOTE CONTROL CR 73 (Code 8092226)
AND EXTERNAL SENSOR (Code 8094101)
6 BASIC SYSTEM
MULTI-ZONE SYSTEM WITH PUMP, ROOM THERMOSTAT, REMOTE CONTROL CR 73 (Code 8092226)
AND EXTERNAL SENSOR (Code 8094101)
7 SYSTEM WITH DOUBLE TEMPERATURE OUTPUT
MULTI-ZONE SYSTEM WITH VALVE, CHRONOTHERMOSTAT AND EXTERNAL SENSOR (Code 8094101)
DAY
ZONE
(70°C)
NIGHT
ZONE
(50°C)
PARAMETER SETTING
To use the remote control
(CR) as room reference for a
zone, set: PAR 7 = 1
Set the opening time of the
zone valve VZ:
PAR 33 = “OPENING TIME”
PARAMETER SETTING
To use the remote control
(CR) as room reference for a
zone, set:
PAR 7 = 1

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RM
SE
CR
CR
SE
SB
M2 R2
SB
BOLLITORE
PARAMETER SETTING
MURELLE BFT with D.H.W sen-
sor to be set:
PAR 3 = 2
MURELLE BFT only for heating
to be set:
PAR 2 = 4
Alternatively it is possible to
use a TA connected to the
entrance TA1.
RM
SE
TA2
TA1
SE
TA 1
SI
RL2
P2P1
PB
RL1
BOLLITORE
PB
SB
SB
RM
SE
CT2
TA 1
SE
CT1
SI
RL2
P2P1
TA 2
RL1
ZONA
GIORNO
(70°C)
ZONA
NOTTE
(50°C)
8 SYSTEM WITH DOUBLE TEMPERATURE OUTPUT
MULTI-ZONE SYSTEM WITH PUMP, CHRONOTHERMOSTAT AND EXTERNAL SENSOR (Code 8094101)
9 SYSTEM WITH REMOTE BOILING UNIT
10 SYSTEM WITH REMOTE BOILING UNIT AFTER THE HYDRAULIC SEPARATOR
DAY
ZONE
(70°C)
NIGHT
ZONE
(50°C)
D.H.W. TANK
D.H.W. TANK

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RM
SE
TA 2
TA1
SE
TA 1
SI
RL2
P2
P1
TA 2
CR
CR
EXP
VM
EXP
IP
RMSE
TA3
TA1
SE
SI
RL3
P3
P2
TA 2
IP
EXP
VM
EXP IP
P4
TA4
RL4
TA 1 TA2
11 SYSTEM WITH MIXER VALVE
SYSTEM WITH ONE DIRECT ZONE AND ONE MIXED ZONE
12 SYSTEM WITH MIXER VALVE
SYSTEM WITH TWO DIRECT ZONES AND TWO MIXED ZONES
PARAMETERS SETTINGS
To use the remote control
(CR) as remote control panel
for the boiler rather than as
room reference, set:
PAR 7 = 0

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2.12 BOILER ELECTRICAL DIAGRAM
“25-30 OF” models
Fig. 13
KEY
F1-2 Fuse (4 AT)
TRA Ignition transformer
Pl System pump
EAR Ignition/detection electrode
EV1-2 Gas valve coil
TS Safety thermostat
TF Fumes thermostat
VP Pressure switch valve
M Modulator
SM Heating sensor
FL Water flow meter
SS D.H.W sensor
TPA Pressure transducer
TA 1 Zone 1 environment thermostat
TA 2 Zone 2 environment thermostat
ST Solar heat sensor
CR Remote control CR 73 (optional)
SE External sensor (optional)
OP Programming clock (optional)
EXP Expansion card
VZ Zone valve
AUX Auxiliary connection
NOTE: Connect TA1 to the clamps 7-8
after having removed the bridge.
CONNECTOR SPARE PART CODES:
CN2 cod. 6299992
CN3 cod. 6299998
CN4 cod. 6316203
CN5 cod. 6316200
CN6 cod. 6316202
CN7 cod. 6316204
CN10 cod. 6316227
CN11 cod. 6316226
CN12 cod. 6299991
CN13 cod. 6299997
“25 OFT” models
KEY
F1-2 Fuse (4 AT)
TRA Ignition transformer
Pl System pump
EAR Ignition/detection electrode
EV1-2 Gas valve coil
TS Safety thermostat
TF Fumes thermostat
M Modulator
SM Heating sensor
FL Water flow meter
VD Deviator valve
SS D.H.W. sensor
TPA Pressure transducer
TA 1 Zone 1 environment thermostat
TA 2 Zone 2 environment thermostat
SB D.H.W. tank sensor
CR Remote control CR 73 (optional)
SE External sensor (optional)
OP Programming clock (optional)
EXP Expansion card
PR/AR Recirculation pump control or
remote alarm
VZ Zone valve
AUX Auxiliary connection
NOTE: Connect TA1 to the clamps 7-8
after having removed the bridge.
CONNECTOR SPARE PART CODES:
CN2 cod. 6299999
CN3 cod. 6299998
CN4 cod. 6316203
CN5 cod. 6316200
CN6 cod. 6316202
CN7 cod. 6316204
CN9 cod. 6316201
CN10 cod. 6316227
CN11 cod. 6316226
CN12 cod. 6299991
CN13 cod. 6299997

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KEY
F1-2 Fuse (4 AT)
TRA Ignition transformer
PI System pump
V Fan
EAR Ignition/detection electrode
EV1-2 Gas valve coil
TS Safety thermostat
PF Fumes thermostat
VP Pressure switch valve
M Modulator
SM Heating sensor
FL Water flow meter
SS D.H.W. sensor
VD Deviator valve
TPA Pressure transducer
TA 1 Zone 1 environment thermostat
TA 2 Zone 2 environment thermostat
ST Solar heat sensor
CR Remote control CR 73 (optional)
SE External sensor (optional)
OP Programming clock (optional)
EXP Expansion card
VZ Zone valve
AUX Auxiliary connection
NOTE: Connect TA1 to the clamps 7-8
after having removed the bridge.
CONNECTOR SPARE PART CODES:
CN2 cod. 6299992
CN3 cod. 6299993
CN4 cod. 6316203
CN5 cod. 6316200
CN6 cod. 6316202
CN7 cod. 6316204
CN10 cod. 6316227
CN11 cod. 6316226
CN12 cod. 6299991
CN13 cod. 6299990
Fig. 13/a
“25-30-35 BF” models
“20-25 BFT” models KEY
F1-2 Fuse (4 AT)
TRA Ignition transformer
Pl System pump
V Fan
EAR Ignition/detection electrode
EV1-2 Gas valve coil
TS Safety thermostat
PF Fumes thermostat
VP Pressure switch valve
M Modulator
SM Heating sensor
FL Water flow meter
VD Deviator valve
TPA Pressure transducer
TA 1 Zone 1 environment thermostat
TA 2 Zone 2 environment thermostat
SB D.H.W. tank sensor
CR Remote control CR 73 (optional)
SE External sensor (optional)
OP Programming clock (optional)
EXP Expansion card
PR/AR Recirculation pump control
or remote alarm
VZ Zone valve
AUX Auxiliary connection
NOTE: Connect TA1 to the clamps 7-8
after having removed the bridge.
CONNECTOR SPARE PART CODES:
CN2 cod. 6299999
CN3 cod. 6299993
CN4 cod. 6316203
CN5 cod. 6316200
CN6 cod. 6316202
CN7 cod. 6316204
CN9 cod. 6316201
CN10 cod. 6316227
CN11 cod. 6316226
CN12 cod. 6299991
CN13 cod. 6299990