Sime VERA 25 OF ErP Manual

Fonderie SIME S.p.A. 6328529A - 08/2022 - R3
Condensing wall mounted boiler
Навесные конденсационные котлы
INSTALLATION AND MAINTENANCE MANUAL
ИНСТРУКЦИЯ ПО МОНТАЖУ И ТЕХНИЧЕСКОМУ ОБСЛУЖИВАНИЮ
VERA 25 OF ErP
RU
EN
TRANSLATION OF THE ORIGINAL INSTRUCTIONS  ПЕРЕВОД ОРИГИНАЛЬНЫХ ИНСТРУКЦИЙ
To consult the documentation, visit
our website www.sime.it
Для ознакомления с документацией
посетите наш сайт www.sime.it

2
EN
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 .
– 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
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 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 leg-
islation 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 warran-
ty with immediate effect.
–
Fonderie SIME S.p.A. reserves the right
to make improvements to its prod-
ucts at any time without prior notice,
without compromising their essential
characteristics. The graphic illustra-
tions and/or images in this document
may show optional accessories that
vary according to the country in which
the appliance is used.

3
EN
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.
–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 interven-
tion or cleaning operation before hav-
ing 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
devices without authorization and in-
structions from the manufacturer.
d
IT IS FORBIDDEN
– To block the condensate drain (if pres-
ent).
– To pull, detach or twist the electrical
cables 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 ambi-
ent temperature of 60 °C and a mini-
mum 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.
–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 material
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.

4
EN
Dear Customer,
Thank you for purchasing a
Sime Vera OF ErP boiler, a new-gen-
eration low-temperature modulating device possessing techni-
cal and performance characteristics capable of satisfying your
space heating and instant domestic hot water requirements
with the utmost safety and with limited running costs.
RANGE
MODEL CODE
VERA 25 OF ErP - (G20) 8110470
VERA 25 OF ErP - (G31) 8110471
COMPLIANCE
Our company declares that Vera OF ErP 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 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 5
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS 11
INSTALLATION AND SERVICING
INSTRUCTIONS
TABLE OF CONTENTS 19

5
EN
USER INSTRUCTIONS
TABLE OF CONTENTS
1 USING THE BOILER VERA 25 OF ErP 6
1.1 Control panel ...................................6
1.2 Preliminary checks ..............................7
1.3 Ignition ........................................7
1.4 Adjusting the delivery temperature .................7
1.5 Adjusting the domestic hot water temperature .......7
1.6 Fault / malfunction codes .........................8
1.7 Temporary shutdown.............................8
1.8 Shutting down for long periods ....................9
2 MAINTENANCE 9
2.1 Adjustments....................................9
2.2 External cleaning................................9
2.2.1 Cleaning the cladding................... 9
3 DISPOSAL 9
3.1 Disposal of the equipment (European Directive
2012/19/EU) ....................................9

6
EN
1 USING THE BOILER VERA 25 OF ErP
1.1 Control panel
2
3
2 2
2 2
1 1
Fig. 1
1 KNOBS
tThe heating knob allows the user to set the heating tem-
perature to between 20 and 80°C during normal opera-
tion.
rThe domestic hot water knob allows the user to set the
domestic hot water temperature to between 10 and 60°C
during normal operation.
2 FUNCTIONAL BUTTONS
sIf pressed once or more than once for at least 1 second
during normal operation, this button allows the user to
change the boiler operating mode in a cyclical sequence
(Stand-by – Summer – Winter).
<This allows the user to scroll through the parameters or
decrease the values.
>This allows the user to scroll through the parameters or
increase the values.
oThis allows the user to confirm the selected parame-
ter or to modify the value or to "unblock" the appliance
when the alarm for a "block" malfunction is present.
cProgramming connector cover plug.
NOTE: pressing any one of these buttons for more than 30 sec-
onds generates a fault on the display without preventing boiler
operation. The warning disappears when normal conditions are
restored.
3 DISPLAY
l
“SUMMER” . This symbol appears when the boiler is oper-
ating in Summer mode or if only the domestic hot water
mode is enabled via the remote control. If the symbols
land nare flashing, this indicates that the chimney
sweep function is active.
n
“WINTER” . This symbol appears when the boiler is oper-
ating in Winter mode or if both the domestic hot water
and heating modes are enabled via the remote control.
With the remote control, if no operating modes have
been enabled both symbols land nwill be off.
R
“RESET REQUIRED” . This message only appears if there
is a malfunction which must be or may be restored man-
ually.
r
“DOMESTIC HOT WATER” . This symbol is present during
a request for DHW or when the chimney sweep function
is operating; it flashes during the domestic hot water set
point selection.
t
“HEATING” . This symbol is present during heating oper-
ation or when the chimney sweep function is operating;
it flashes during the heating set point selection.
f
“BLOCK” DUE TO NO FLAME .
F
“FLAME PRESENCE" .
K
“ALARM" . This indicates that a fault has occurred. The
number specifies the cause which generated the alarm.
H
"MAINTENANCE REQUEST" . If active, it shows it is time to
perform maintenance on the boiler.

7
EN
1.2 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
Vera OF ErP 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, which is to be prearranged on the system re-
turn, and restore the heating system pressure until the pres-
sure gauge (1) shows a reading of
1-1.2 bar
– close the filling valve.
1
Fig. 2
1.3 Ignition
After having carried out the preliminary checks, perform the
following to start the boiler:
– set the main system switch to "ON"
ON
Fig. 3
– on the display, check that the operating mode on the display
is "SUMMER” land if necessary select it by pressing and
holding the button sfor at least 1 second. the value of the
delivery sensor detected at that moment will appear on the
display
– open one or more than one hot water tap. The boiler will work
at maximum power until the taps are closed.
Once the boiler has been commissioned in "SUMMER mode"l
"WINTER mode" ncan be selected by pressing and holding the
buttonsfor at least 1 second. the value of the heating water
temperature detected at that moment will appear on the dis-
play. In this case it is necessary to adjust the air thermostat/s to
the required temperature or if the system has a chrono-thermo-
stat, check that this is "active" and adjusted.
1.4 Adjusting the delivery temperature
If the boiler delivery temperature is to be increased or decreased
it is possible to act on the tknob on the control panel rather
than having to modify the specific parameters. The temperature
can be set to between 20 and 80°C.
Fig. 4
1.5 Adjusting the domestic hot water temper-
ature
If the domestic hot water temperature is to be increased or de-
creased, act on the rknob on the control panel. The tempera-
ture can be set to between 10 and 60°C.
Fig. 5

8
EN
1.6 Fault / malfunction codes
If a fault/malfunction is detected during boiler operation, the
message
"AL" will appear on the display followed by the fault
code.
If you see alarm
“02” (low water pressure in the system):
– 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, which is to be prearranged on the system re-
turn, and restore the heating system pressure until the pres-
sure gauge (1) shows a reading of
1-1.2 bar
– close the filling valve
– press and hold the oRbutton for more than 3 seconds
and check whether normal operating conditions are restored.
1
Fig. 6
If you see alarm “06” (no flame detected) and “07” (safety ther-
mostat intervention):
–press and hold the oRbutton for more than 3 seconds
and check whether normal operating conditions are restored.
If this operation is not successful,
ONLY ONE MORE ATTEMPT can
be made, therefore:
– close the gas isolation valve
– set the main system switch to "OFF"
– contact the Qualified Technical Personnel.
OFF
Fig. 7
m
CAUTION
Should you see an alarm not described here, contact a
qualified technical professional.
1.7 Temporary shutdown
If the user wishes to interrupt boiler operation, press and hold
the button sfor at least one second, once if in "WINTER mode"
nor twice if in "SUMMER mode" l.
"- -" will appear on the
display.
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:
– press and hold the button sonce if in "WINTER mode" nor
twice if in "SUMMER mode" lto put the boiler into stand-by
– set the main system switch to "OFF"
– close the gas valve.
OFF
Fig. 8
m
CAUTION
If the outside temperature might fall below ZERO,
since the appliance is equipped with an "antifreeze
function"
– ONLY PUT THE BOILER INTO STAND-BY
– leave the main system switch set to "ON" (boiler is
powered)
– leave the gas valve open.

9
EN
1.8 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:
– press and hold the button sfor at least 1 second, once if in
"WINTER mode" nor twice if in "SUMMER mode" lto put
the boiler into stand-by
"- -" will appear on the display
– set the main system switch to "OFF"
OFF
Fig. 9
– 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.
2 MAINTENANCE
2.1 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.
2.2 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.
2.2.1 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.
3 DISPOSAL
3.1 Disposal of the equipment (European Di-
rective 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
collection systems, in accordance with the law
and with Directive 2012/19/EU. This product
was designed and manufactured for minimis-
ing its impact on the environment and on hu-
man health, but it contains components that
could be detrimental if managed improperly.
The symbol (crossed-out wheelie bin) depict-
ed here and also appearing on your appliance
means that the appliance at the end of its life
must be managed in accordance with the law
and treated as electrical and electronic waste.
Before delivering the appliance for its disposal,
consult the applicable 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 lo-
cal offices.
d
IT IS FORBIDDEN
dispose of the product with urban waste.

10
EN

11
EN
DESCRIPTION OF THE APPLIANCE
TABLE OF CONTENTS
4 DESCRIPTION OF THE APPLIANCE 12
4.1 Characteristics ................................12
4.2 Check and safety devices ........................12
4.3 Identification ..................................12
4.3.1 Technical Data Plate................... 13
4.4 Structure .....................................14
4.5 Technical features ..............................15
4.6 Main water circuit ..............................16
4.7 Sensors.......................................16
4.8 Expansion vessel ...............................16
4.9 Circulation pump ...............................17
4.10 Control panel ..................................17
4.11 Wiring diagram ................................18

12
EN
4 DESCRIPTION OF THE APPLIANCE
4.1 Characteristics
Vera OF ErP are last generation low temperature wall mounted
boilers which
Sime has produced for heating and domestic hot
water production. The main design choices made by
Sime for the
Vera OF ErP boilers are:
– the atmospheric burner combined with a copper heat ex-
changer for heating and a rapid heat exchanger for DHW
–the open combustion chamber which classifies the "Type B"
boiler in relation to the room where it is installed
– the command and control microprocessor electronic board
not only allows a better management of the heating system
and the system for domestic hot water production but it can
also be connected to air thermostats or a remote control (with
an Open Therm protocol), an auxiliary sensor for the connec-
tion of any possible solar kits or to an external sensor. If this is
the case, the boiler temperature varies on the basis of the ex-
ternal temperature according to the selected optimal climatic
curve allowing for significant energy and economic savings.
Other special features of the
Vera OF ErP boilers are:
– the anti-freeze function which activates automatically if the
temperature of the water inside the boiler falls below the
threshold of the value set at parameter "tS 1.0" and , if there
is an external sensor, if the external temperature falls below
the threshold of the value set at parameter "tS 1.1".
– 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 and when checking gas
pressure at the nozzles
– 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.
4.2 Check and safety devices
The Vera OF ErP boilers are equipped with the following check
and safety devices:
– thermal safety sensor 100°C
– smoke thermostat
– 3 bar relief valve
– heating water pressure switch
– delivery sensor
– DHW sensor.
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.
4.3 Identification
The Vera OF ErP 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 data, appliance perfor-
mance information and any other information required by
law in the country where the appliance will be used.
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
3
3
1 2
Fig. 10

13
EN
4.3.1 Technical Data Plate
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
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 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
GAS CHANGE
BOX TO BE MARKED
IF THE GAS IS CHANGED
D.H.W. CONTENT
Fig. 11
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.

14
EN
4.4 Structure
20
21
17
18
19
2
1
3
4
7
8
6
9
12 14
15
16
13
5
10 11
1 Smoke thermostat
2 Smoke chamber
3 Dual sensor (thermal safety/delivery)
4 Combustion chamber
5 Ignition/detection electrode
6 Diverter valve
7 System filling unit
8 Domestic hot water sensor
9 Control panel
10 Secondary heat exchanger
11 Gas valve
12 Domestic water filter and flow regulator
13 System relief valve
14 Boiler drain
15 System pump
16 Water pressure switch
17 Automatic bleed valve
18 Burner
19 Primary heat exchanger
20 Expansion vessel
21 Smoke outlet
Fig. 12

15
EN
4.5 Technical features
DESCRIPTION Vera 25 OF ErP
CERTIFICATIONS
Country of intended installation IT - CZ - ES - GB - GR - HR - PT - SI
Fuel G20 - G31
PIN number 1312CT6308
Category II2H3P
Appliance classification B11BS
Class NO
x 6 (< 56 mg/kWh)
DHW rated useful heat output kW 20,8
HEATING PERFORMANCE
HEAT INPUT (*)
Nominal flow (Q
n max) kW 23
Minimum flow (Q
nw min) kW 10
HEAT OUTPUT
Nominal (80-60°C) (P
n max) kW 20,8
Minimum (80-60°C) kW 8,8
EFFICIENCY
Max useful efficiency (80-60°C) %90,4
Min useful efficiency (80-60°C) %88,0
Useful efficiency at 30% of load %91,4
Losses after shutdown at 50°C W164
DOMESTIC HOT WATER PERFORMANCE
Nominal heat input [Q
nw max] kW 23,0
Minimum heat input [Q
nw min] kW 10,0
Specific D.H.W. flow rate ∆t 30°C (EN 13203) l/min 10,0
Continuous D.H.W. flow rate (∆t 25°C/∆t 35°C) l/min 12,3 / 8,8
Minimum D.H.W. flow rate l/min 2,2
Max [PMW] / Min pressure bar 7 / 0,4
kPa 700 / 40
ENERGY PERFORMANCE
HEATING
Heating seasonal energy efficiency class C
Heating seasonal energy efficiency %78,4
Sound power dB(A) 59
DOMESTIC HOT WATER
Domestic hot water energy efficiency class A
Domestic hot water energy efficiency %80,3
Stated domestic hot water profile load XL
ELECTRICAL SPECIFICATIONS
Power supply voltage V230
Frequency Hz 50
Absorbed electrical power [Q
n max] W53
Absorbed electrical power at [Q
n min] W53
Absorbed electrical power in stand-by W3,0
Electrical power absorbed by the pump W43
Electrical protection degree IP X4D
COMBUSTION DATA
Smoke temperature at Max/Min flow (80-60°C) °C 119 / 76
Maximum smoke flow Min/Max g/s 14,7 / 18,5
CO
2 at Max / Min flow rate (G20) %5,1 / 2,7
CO
2 at Max / Min flow rate (G31) %5,5 / 2,7
NOx measured mg/kWh 18
NOZZLES  GAS
Number of nozzles No. 24
Nozzle diameter (G20) mm 0,85
Nozzle diameter (G31) mm 0,52
Gas consumption at Max/Min flow rate (G20) m
3
/h 2,43 / 1,05
Gas consumption at Max/Min flow rate (G31) kg/h 1,78 / 0,78
Gas supply pressure (G20/G31) mbar 20 / 37
kPa 2 / 3,7
(*) Heat input calculated using the lower heat output (Hi)

16
EN
DESCRIPTION Vera 25 OF ErP
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 l3,15
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)
4.6 Main water circuit
1
19
4
5
3
6
8
16
109
15
18
17
12
11 14 S
13
7
M U G E R
2
Fig. 13
KEY:
M System delivery
R System return
U Domestic hot water outlet
E Domesti hot water inlet
S Safety valve outlet
G Gas supply
1 Smoke thermostat
2 Heat exchanger (mo-
no-thermal)
3 Dual sensor (thermal
safety/delivery)
4 Combustion chamber
5 Gas valve
6 Domestic hot water heat
exchanger
7 Domestic hot water
sensor
8 Diverter valve
9 Automatic bleed valve
10 Pump
11 Domestic hot water flow
meter
12 Domestic hot water filter
13 System filling
14 System relief valve
15 Water pressure switch
16 Boiler drain
17 System expansion vessel
18 Water pressure gauge
19 Smoke chamber
4.7 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
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω
TR=80°C → R=1669Ω.
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
4.8 Expansion vessel
The expansion vessel installed on the boilers has the following
characteristics:
Description U/M
Vera OF ErP
25
Total capacity l8,0
Prefilling pressure kPa 100
bar 1,0
Useful capacity l4,0
Maximum system content (*) l109
(*) Conditions of:
Average operating temperature 70°C (with high tempera-
ture system 80/60°C)
Start temperature at system filling 10°C.
m
CAUTION
– For systems with water content exceeding the max-
imum system content (as indicated in the table) an
additional expansion vessel must be prearranged.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 metres,
increase the prefilling pressure of the expansion
vessel and the system when cold by 0.1 bar for each
meter increase.

17
EN
4.9 Circulation pump
The flow-head performance curve available for the heating sys-
tem is shown in the graph below.
RESIDUAL HEAD (mbar)
0
0 800 1000 1200 1400600400200
100
200
300
400
500
600
25 OF
WATER FLOW RATE (l/h)
Fig. 14
4.10 Control panel
2
3
2 2
2 2
1 1
Fig. 15
1 KNOBS
tThe heating knob allows the user to set the heating tem-
perature to between 20 and 80°C during normal opera-
tion.
rThe domestic hot water knob allows the user to set the
domestic hot water temperature to between 10 and 60°C
during normal operation.
2 FUNCTIONAL BUTTONS
sIf pressed once or more than once for at least 1 second
during normal operation, this button allows the user to
change the boiler operating mode in a cyclical sequence
(Stand-by – Summer – Winter).
<This allows the user to scroll through the parameters or
decrease the values.
>This allows the user to scroll through the parameters or
increase the values.
oThis allows the user to confirm the selected parame-
ter or to modify the value or to "unblock" the appliance
when the alarm for a "block" malfunction is present.
cProgramming connector cover plug.
NOTE: pressing any one of these buttons for more than 30 sec-
onds generates a fault on the display without preventing boiler
operation. The warning disappears when normal conditions are
restored.
3 DISPLAY
l
“SUMMER” . This symbol appears when the boiler is oper-
ating in Summer mode or if only the domestic hot water
mode is enabled via the remote control. If the symbols
land nare flashing, this indicates that the chimney
sweep function is active.
n
“WINTER” . This symbol appears when the boiler is oper-
ating in Winter mode or if both the domestic hot water
and heating modes are enabled via the remote control.
With the remote control, if no operating modes have
been enabled both symbols land nwill be off.
R
“RESET REQUIRED” . This message only appears if there
is a malfunction which must be or may be restored man-
ually.
r
“DOMESTIC HOT WATER” . This symbol is present during
a request for DHW or when the chimney sweep function
is operating; it flashes during the domestic hot water set
point selection.
t
“HEATING” . This symbol is present during heating oper-
ation or when the chimney sweep function is operating;
it flashes during the heating set point selection.
f
“BLOCK” DUE TO NO FLAME .
F
“FLAME PRESENCE" .
K
“ALARM" . This indicates that a fault has occurred. The
number specifies the cause which generated the alarm.
H
"MAINTENANCE REQUEST" . If active, it shows it is time to
perform maintenance on the boiler.

18
EN
4.11 Wiring diagram
BLUE BLUE
RED
RED
RED RED
RED
GREEN
WHITE
RED RED
BLUE
BROWN
BLUE
230 V - 50 HZ
L
N
BROWN
SS
SM1 SM2
TRA
EAR
EV
F
PI
PA FLM
BLACK BLACK
CN6
CN5
CN3
CN17
CN4 CN1
CN15
CN14
CN13CN12
CN11
VCC GND IN
CN2
TF
BLACK BLACK
BLUE BLUE
3456
SE
TA
CR
BLACK
BLUE
BROWN
VD
2 3
L Line
N Neutral
F Fuse (3.15AT - 250V)
TRA Ignition transformer
PI System pump
TF Smoke thermostat
EAR Ignition / Detection electrode
EV Gas solenoid valve
SS Domestic hot water sensor
SM1-2 Dual sensor (thermal safety/delivery)
FLM Flow meter
VD Diverter valve
PA Water pressure switch
TA Air thermostat
SE External sensor
CR Remote control (instead of air thermo-
stat)
To connect the "Air Thermostat" or, alternatively the "Remote Control", remove the bridge
between terminals 5-6. Fig. 16
m
CAUTION
Users must:
– To mount an omnipolar residual-current circuit
breaker conforming to EN standards
that allows for
completely disconnecting the system in overvoltage
category III conditions (that is, with a gap of at least 3
mm between the open contacts)
.
– Respect the connections L (Live) - N (Neutral).
– Ensure that the special power cable is only replaced
with a cable ordered as a spare part and connected
by professionally qualified personnel.
m
CAUTION
Users must:
– Connect the earth wire to an effective earthing sys-
tem.
The manufacturer is not responsible for any dam-
age caused by failure to earth the appliance or failure
to observe the information provided in the wiring dia-
grams
.
d
IT IS FORBIDDEN
To use water pipes for earthing the appliance.

19
EN
INSTALLATION AND SERVICING INSTRUCTIONS
TABLE OF CONTENTS
5 INSTALLATION 20
5.1 Receiving the product ...........................20
5.2 Dimensions and weight..........................20
5.3 Handling ......................................20
5.4 Installation room ...............................20
5.5 New installation or installation of a replacement
appliance .....................................21
5.6 Cleaning the system ............................21
5.7 Water system treatment .........................21
5.8 Boiler installation ..............................21
5.9 Plumbing connections...........................22
5.9.1 Plumbing accessories (optional) ......... 22
5.10 Gas supply ....................................22
5.11 Smoke outlet and combustion air inlet .............22
5.12 Electrical connections...........................23
5.12.1 External temperature sensor............ 24
5.12.2 Chrono-thermostat or Air Thermostat .... 24
5.12.3 EXAMPLE of use of the command/control
device on some types of heating systems.. 24
5.13 Refilling or emptying............................25
5.13.1 REFILL operations .................... 25
5.13.2 EMPTYING operations ................. 26
6 COMMISSIONING 27
6.1 Preliminary operations ..........................27
6.2 Before commissioning ..........................27
6.3 Parameter setting and display....................28
6.4 List of parameters..............................28
6.5 Display of operating data and counters.............30
6.6 Checks and adjustments ........................30
6.6.1 Chimney sweeper function.............. 30
6.6.2 Adjusting gas pressure at the nozzles..... 31
6.7 Gas conversion.................................32
6.7.1 Preliminary operations................. 32
6.8 Automatic calibration procedure ..................34
7 MAINTENANCE 37
7.1 Adjustments...................................37
7.2 External cleaning...............................37
7.2.1 Cleaning the cladding.................. 37
7.3 Cleaning the inside of the appliance ...............37
7.3.1 Cleaning the heat exchanger ............ 37
7.3.2 Cleaning the burner ................... 38
7.3.3
Checking the ignition/detection electrode ... 38
7.3.4 Final operations ...................... 38
7.4 Checks .......................................39
7.4.1 Checking the smoke duct............... 39
7.4.2 Checking the expansion vessel pressure .. 39
7.5 Unscheduled maintenance .......................39
7.6 Malfunction codes and possible solutions ..........39
7.6.1 Maintenance request .................. 40

20
EN
5 INSTALLATION
m
CAUTION
The appliance must only be installed by the Sime Tech-
nical Service or by qualified professionals
who MUST
wear
suitable protective safety equipment.
5.1 Receiving the product
Vera OF ErP appliances are delivered in a single unit protected by
cardboard packaging.
Fig. 17
The plastic bag found inside the packaging contains the follow-
ing:
–Installation, use and maintenance manual
– Paper template for boiler installation
– Certificate of warranty
– Hydrostatic test certificate
– System booklet
– Bag with expansion plugs
d
IT IS FORBIDDEN
To leave packaging material around or near children
since it could be dangerous. Dispose of it as pre-
scribed by legislation in force.
5.2 Dimensions and weight
H
WD
Ø 130 mm
Fig. 18
Description
Vera OF ErP
25
W (mm) 400
D (mm) 250
H (mm) 700
Weight (kg) 24,5
5.3 Handling
Once the packaging has been removed, the appliance is to be
handled manually, tilting it slightly, lifting it and applying pres-
sure in the points indicated in the figure.
Fig. 19
d
IT IS FORBIDDEN
To grip the appliance casing. Hold the "solid" parts of
the appliance such as the base and structural frame.
a
WARNING
Use suitable tools and accident protection when re-
moving the packaging and when handling the appli-
ance. Observe the maximum weight that can be lifted
per person.
5.4 Installation room
The room where the appliance is to be installed must comply
with the Technical Regulations and Legislation in force. It must
be equipped with sufficiently sized ventilation openings.
The minimum temperature of the installation room must NOT
be lower than
-5 °C .
m
CAUTION
– Before assembling the appliance, the installer MUST
make sure that the wall supports the weight.
– Remember to consider the space needed in order to
access the safety/adjustment devices and to carry
out maintenance interventions (see Fig. 20).