ACV SV - 35 User manual

BOILER ROOM
Important
•Never obstruct the ventilation.
•Do not store inflammable products in the boiler room.
•Avoid storing corrosive products such as paint, solvents, chlorine,
salt, soap or other cleaning products near the boiler.
Accessibility
The boiler room should be big enough to allow easy access to the
boiler. Minimum clearances around the boiler (mm):
- to the front 500
- to the rear 150
- to the sides 100
- above 700
Ventilation
The boiler room must have both low and high level ventilation (see
Fig. 3).
By way of information, the table below gives the minimum
ventilation requirements according to Belgian regulations.
The user must ensure that his boiler room ventilation complies
with local regulations.
Chimney connector type: B23 (Fig.3)
The chimney must be connected to the boiler by means of a metal
pipe rising at an angle from the boiler to the chimney.
A chimney connection is required.
A. High level ventilation
B. Low level ventilation
C. Draught stabiliser
D. Flame inspection window
E. Height of lined chimney
F. Chimney diameter
A
B
F
D
C
E
SV - MV / 35 SV - MV / 50
Ventilation
Fresh air supply min. m3/h 63 90
High level ventilation (A) dm21.5 1.5
Low level ventilation (B) dm21.5 2
Draught stabiliser (C) Ø80 100
N.B.:
The figures for (B) and (C) only apply to type B23 connectors.
Base
The base on which the boiler will be mounted must be made from
non-combustible materials.
CHIMNEY CONNECTIONS
IMPORTANT
The boiler must be installed by a qualified engineer in
accordance with the local standards and codes of
practice.
The diameter of the chimney must not be less than the
diameter of the boiler's chimney reducer.
Fig. 3: Boiler ventilation and chimney connection type B23
Important note:
The above table is shown by way of indication only as
regulations vary from country to country.
The high efficiency of our boilers means that the flue
gases exit at low temperature.The attendant risk of
condensation may cause damage to some chimneys.
To avoid this risk we strongly advise that you line the
chimney.
Please contact your installer for further information
about chimney lining.
SV - MV / 35 SV - MV / 50
Chimney
E = 5 m Ø min. F mm 213 236
E = 10 m Ø min. F mm 179 199
E = 15 m Ø min. F mm 162 179
6
INSTALLATION
CHIMNEY CONNECTORS TYPE: C XX (Figs. 4, 5 and 6)
• C 13 (x): Concentric / parallel connector with horizontal terminal.
• C 33 (x): Concentric / parallel connector with vertical terminal.
• C 43 (x): Concentric / parallel connector for several boilers in a
common chimney.
• C 53 (x): Parallel chimney connector with air intake and flue gas
outlet in different pressure zones (different locations).
• C 63 (x): Connector for connection to an approved discharge system
(Netherlands, Germany and Luxembourg only).

7
INSTALLATION
Fig. 5:
Concentric co nnector Fig. 6: Parallel connector
Fig. 4: Chimney connectors type C xx
C43
C53
C13
C33
2 m min.
150 min.
120
C13
C13
Concentric connector
Maximum length concentric tubing:
6 metres due to the maximum air temperature at the venturi (70°C).
Note:
-A90 degree bend = 1 metre equivalent length.
Example:
-6metres concentric = one 90° bend + 4 metres horizontal +
outlet 1 metres.
“CE” approved according to EN 483
A drain outlet must be provided near the boiler to
prevent condensation from the chimney entering the
boiler.
All horizontal pipe runs must fall to the boiler to prevent
condensation water escaping from the terminal.
Parallel connector
Table of flue resistance in Pascal
(1 Pascal = 0,01 mbar)
SV - MV / 35 SV - MV 50
Ø 80 mm Ø 100 mm
Straight pipe L. 500 mm 1.18 1.82
Straight pipe L. 1000 mm 2.55 2.3
Straight pipe L. 2000 mm 5.1 4.6
90° pipe bend 4.32 6
45° pipe bend 2.75 3.1
30° pipe bend 1.67 1.7
5° pipe bend 0.69 0.76
Vertical terminal 5.4 3.53
Horizontal terminal 5.5 3.53
Condensation drain 2.06 1.53
1000 mm
1000 mm
2000 mm
2000 mm
This table is based on the equipment offered by ACV and connot be
applied generally.
Sample calculation
The diagram below consists of the
following parts (Ø 80 mm) :
•1x Pipe bend 90°
•2x Straight pipe L 2000 mm
•2x Pipe bend 45°
•2x Straight pipe L 1000 mm
•1x Vertical terminal
•1x Condensation drain vertical
Calculation:
•1x 4,32 = 4,32
•2x5,1 = 10,2
•2x 2,75 = 5,50
•2x 2,55 = 5,10
•1x5,4 = 5,4
•1x 2,06 = 2,06
Total: 32,58 x 2 = 65,16 Pa
This value is less
than the maximum
authorised resistance,
therefore the installation
is compliant.
A condensation drain outlet must be fitted close to the
boiler to prevent condensation products from the
chimney running into the boiler.

Drain
The drain cock and safety valve must be connected to the building drain.
HOT WATER CONNECTION
Pressure reducing valve
If the mains water pressure exceeds 6 bar, a pressure reducing valve
calibrated to 4.5 bar must be installed.
Safety group
The safety group of the water tank must be approved by ACV and
calibrated to 7 bar; the group's valve discharge must be connected
to the drain.
Hot water expansion vessel
Installing a hot water expansion vessel will prevent any risk of excess
pressure due to water hammer or pressure fluctuations.
Hot water circulation
If the water tank is a long way from the point of use, installing a closed
recirculation circuit can ensure a faster hot water drawoff at any time.
Typical circuit with thermostat valve
1. Safety group
2. Pressure reducing valve
3. Thermostatic mixer
4. Hot water pump
5. Non-return valve
6. Hot water expansion vessel
7. Cold water supply tap
8. Drawoff tap
9. Drain cock
10. Air vent
11. Isolating valve
8
Fig. 8: Heating system layout
Fig. 9: Hot water system layout
INSTALLATION
9
5
6
2
1
3
8 8
4
7
73
10
11 8
4
5
6
9
5
2
1
IMPORTANT
As a safety measure, we strongly advise the
installation of a thermostatic mixer to prevent
any risk of burning to persons.
ACV kit water
ACV can supply an optional
pre-assembled water kit.This
kit comprises:
•Apump;
•A3-way manual valve.This valve
can be motorised if required;
•Connection pipes that can be
used to connect a second
heating circuit;
•Two isolating valves;
•Connectors for the right or left
hand mounting of the expansion
vessel, the safety valve with
pressure gauge and the filling
valve. (The expansion vessel is not
included).
Typical single circuit configuration
CONNECTING THE HEATING SYSTEM
1. 3-way motorised mixer valve.
2. Safety valve calibrated to
3 bar, with pressure gauge.
3. Pump.
4. Non-return valve.
5. System filling valve.
6. Expansion vessel.
7. Controller ACV 13.00
(see Controller Kit on page 9)
8. Isolating valve, heating system.
9. Drain cock.
fig. 7 : ACV water kit

9
INSTALLATION
Optional accessories
CONTROLLER KITS
KIT 1: ACV 13.00 / Basic
This basic kit is used to control the hot water circuit outlet temperature
as a function of ambient conditions.
It comprises: a temperature controller with analog clock, a surface-
mounted primary water temperature sensor (-30/130°C), an outdoor
sensor (-30/50°C), a servomotor SQY 31 230 V - 3-pin and an
intermediate socket.
Circuit diagram of ACV control kits
B2. Temperature sensor
B9. Outdoor sensor
B5. Analog/digital room sensor
P1. Pump
Y1/Y2/N. Servomotor (SQK 349)
bl. Blue N
n/z. Black Y2
br. Brown Y1
Safety group Ø 3/4”
Pressure reducing valve Ø 3/4”
Thermostatic mixer Ø 3/4”
Expansion vessel 5 litres
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
bl bk br
SQK 349
QAAD50
(QAAD70) QAC32 QAD22
P1 B5 B9 B3 B2
P1Y1Y2NB5B9B3B2
KIT 2: ACV 13.00 / Standard
This basic kit is used to control the hot water circuit outlet temperature
as a function of ambient conditions.
It comprises: a temperature controller with analog clock, a surface-
mounted primary water temperature sensor (-30/130°C), an outdoor
sensor (-30/50°C), a servomotor SQY 349 230 V - 3-pin and an
intermediate socket.
Please contact your installer for further details about
this.
CONNECTION TO THE GAS SUPPLY
-The Prestige is fitted with a 3/4” M connector, to which you can
connect the gas tap.
-You must comply with the NBN D51-003 standard for connections
to the gas and, if applicable, with the other standards in force in
the location of the connection.
-Where there is a risk of dirt stemming from the network, place a
gas filter upstream from the connection.
-Drain the gas pipe and check in minute detail that all the boiler
pipes, both inside and outside, are sealed.
-Check the gas pressure in the system.
-Check the gas pressure and consumption when commissioning
the appliance.

10
INSTALLATION
1
2
C
L1
L1
N
T1
T2
N
T1
T2
S3
S3
L1
N
1
23456789101112
S3
B4
N
T2
T1
L1
S3
B4
N
T1
T2
L1
2
30
V~
50
H
z
6A
Br
B
B
Br
Gr
G
Y
Bk
Br
BG 2000-SV
Delta Performance SV
Y/Gr
Br
Br
Or
BBB
B
Or
B
Y/Gr
Or
Gr
G
Bk
Y B
Y/Gr
Y/Gr
12
1
3
4
711
10
9
8
2
6
5
7
ELECTRICAL CONNECTIONS
Principle of supply
The boiler operates on a single-phase supply of 230 V/50 Hz. You
should install a control box with main switch and 6 A fuses externally
to the boiler to allow the boiler to be isolated from the supply for
servicing and repairs.
Statutory compliance
The installation must comply with your local standards and codes of
practice.
Safety
The stainless steel water tank must be provided with a separate
earth.
The boiler must be isolated from the electrical supply
before any work is carried out on it.
Wiring for the SV boiler (Fig. 10)
1. Control thermostat (60/90°C)
2. Thermal reset high limit thermostat (95°C)
3. Manual reset high limit thermostat (103°C max.)
4. Main switch
5. Reset
6. Burner shutdown indicator lamp
7. Summer/Winter switch
8. Power supply to boiler
9. Room thermostat (optional)
10. Heating pump connection
11. Boiler electrical supply connection
(6-pin plug)
12. Burner connection
(7-pin plug)
Wiring for the MV boiler (Fig. 11)
1. Potentiometer (60/90°C)
2. Thermal reset high limit thermostat (95°C)
3. Manual reset high limit thermostat (103°C max.)
4. Main switch
5. Reset
6. Burner shutdown indicator lamp
7. Summer/Winter switch
8. Power supply to boiler
9. Room thermostat (optional)
10. Heating pump connection
11. Boiler electrical supply connection
(6-pin plug)
12. Burner connection
(6-pin plug)
13. Fan connection (PWM and 230 V)
14. NTC sensor
15. Printed circuit board
16. Control/monitoring relay
Key to wiring
B. Blue
Bk. Black
Br. Brown
G. Grey
Gr. Green
Or. Orange
R. Red
W. White
Y. Yellow
Y/Gr. Yellow / Green
Delta performance SV (Fig. 10)

11
INSTALLATION
S3T2T1NL1
S3T2T1NL1
S3
S3
T2
T2
T1
T1
N
N
L1
L1
230V-50Hz
6A
1 2 3 4 5 6 7 8 9 10 11 12
PhN
NTC
12345
230 V-50Hz
PWM
1234
RY2
21X4
X7
X1
X3
X8
F1
2AT
Pri 230V - 50/60 Hz
SEC 18V - 2,0 VA
Typ EI 30/15,5
BV 030-7308.OS
6
5
4
3
2
13
4
6
7
1
2
3
4
+ -
+ -
+ -
P4
P2
P3
GND PWM 12 V HALL
S3
S3
T2
T2
T1
T1
N
N
L1
L1
1x6
1x3
1x4
1x5
1x3
1x7
1
2
C
Bk
B
B
Y/Gr
Br
Gr
Y
G
G
Br
Y/Gr
B
Or Bk
Bk
B
B
Bk
Br
Y/Gr
B
R
G
GY
Y
Y
Or
BrR
B
G
Y/Gr
R
B
Gr
Y/Gr
Br
B
Gr
G
B
R
Bk
Gr
B
Y/Gr
Br
Bk
Br
Gr
B
W
B
Bk
Br Gr
W
B Y
G
B
BG 2000-MV
Delta Performance MV
12 12
2
1 6 5 7 4
810 9
3
11
13
14
15
16
Start
Min.
Max.
Delta performance SV (Fig. 11)

12
BURNER CHARACTERISTICS
DESCRIPTION OF THE BURNER
Gas burner ACV BG 2000-SV
ACV BG 2000 air/gas premix burners are equipped with a gas valve,
a venturi and a Honeywell electrical control relay.These items have
been specially developed for low NOx air/gas premix burners with
automatic ignition and flame detection.
Gas burner ACV BG 2000-MV
The ACV BG 2000-MV burner is based on the technology of the ACV
BG 2000-SV burner but offers the benefits of a modulating burner.
The burner's output is constantly adjusted to suit the fluctuating
demand for heat, thus optimising operating efficiency.
BG 2000-SV and MV burners are preset in our factory
for use with natural gas (equivalent to G20).
CONVERSION TO PROPANE: (refer to the conversion instructions)
Prohibited in Belgium.
Conversion kit supplied with the boiler comprises:
- Orifice(s).
- Propane rating plate(s).
- Self-adhesive settings label.
- Conversion instructions.
BURNER BG 2000-SV AND MV
Venturi
Gas valve
Burner reset (also on the control panel)
Control/monitoring relay
Venturi
Female gas connector 3/4”
NIT burner tube
Burner chamber plate sealing cord
Ionisation electrode
Ignition electrode
Burner chamber plate insulation

13
BURNER CHARACTERISTICS
BURNER BG 2000-SV
BURNER BG 2000-MV
Burner chamber plate
Flame inspection window
Ignition cable
Ionisation cable
Control/monitoring relay
Burner chamber plate
Flame inspection window
Box containing the p.c.b.
Ignition cable
Ionisation cable
PWM connector
Control/monitoring relay

14
BURNER CHARACTERISTICS
OPERATING PRINCIPLE OF THE BURNER
AIR/GAS mixture control (Fig. 12)
The fan draws air in across the venturi.This creates a vacuum P1 at
the venturi neck. The gas valve regulator now reacts to maintain a
difference equal to the amount of the offset between the pressure at
the gas valve outlet P2 and atmospheric pressure P3:P2 – P3 = off-
set.
If the air flow decreases, P1 rises; the same applies to P2;now
P2>P3;the regulator Rmoves upwards and restores the equilibrium
P2 – offset = P3;pressure P4 falls and valve Cmoves down: the
gas flow decreases.
Whatever the speed of the fan therefore, the Air/Gas ratio is main-
tained equal to 1 to within the amount of the offset.
The difference in pressure between the neck of the venturi and the
outlet from the gas valve now draws gas through the venturi.
The gas flow adjuster screw is used to adjust the amount of gas that
is to be injected for a given air flow, and this will determine the %CO2
in the flue gas. It is now a very simple matter to control the burner's
power by adjusting the fan speed and the %CO2to predefined
settings.
Ignition and flame monitoring
The control and monitoring relay has a dual function: it ignites the
burner by producing sparks at the ignition electrode, and it monitors
the actual presence of a flame when the gas valve is open (it measures
the ionisation current).
Starting sequence: (Fig. 13)
The fan starts up when the boiler thermostat/potentiometer detects
a demand for heat.After a 15 second pre-purge the gas valve opens
simultaneously with the ignition. Provided an ionisation current is
detected inside the first 5 seconds, combustion continues normally
until heat is no longer called for. Otherwise, the gas valve closes and
the fan stops; the burner is now shut down.
If the burner shuts down:
1. The burner indicator lamp lights up on the control panel and on
the burner.
2. Press the burner reset button on the control panel. Turn the
boiler off for several seconds at the main switch, then restart the
the boiler.
Gas tube (Fig. 14)
The air/gas mixture leaving the gas valve/venturi assembly is
propelled into the burner tube.
This tube is covered with metal fibres (NIT). This enhances the
distribution of the flame, increasing its life and significantly reducing
pollutant emissions.
Combustion of the air/gas mixture is also spread uniformly around
the circumference of the tube. The tube is also designed to
withstand propane combustion.
1. Air
2. Gas
3. Venturi
4. Fan
5. Offset adjuster screw
6. Gas flow adjuster screw (CO2)
7. Air/gas mixture
Fig. 12: Air/gas mixture control
Fig. 13: Starting sequence
Fig. 14:The NIT gas tube in operation
1 7
2
5
R
3 4
6
P1
P2
P3
P4
C
Ionisation
Thermostat
Fan
Gas valve opens
Ignition
15s
5s

15
BURNER CHARACTERISTICS
SETTING PARAMETERS
GAS CATEGORIES
TYPE SV/35 SV/50 MV/35 MV/50
Input kW 34.9 50 10 / 34.9 15 / 50
Nominal output kW 32 46.7 9.5 / 32 14.5 / 46.7
Combustion efficiency - natural gas %92.9 93.5 96.4 / 92.9 97 / 93.5
Offset mbar 00-0.4 - 0.4
Starting speed r.p.m. --4000 4000
Min. speed r.p.m. --1370 1400
Max. speed r.p.m. 4600 4400 4600 4400
CO2natural gas %9999
CO2propane %10.3 13.3 10.3 10.3
Gas G20 - 20 mbar - I 2E(S)B - I 2 Er - I 2H - I 2ELL - I 2E
Flow m3/h 3.7 5.3 1.06 / 3.7 1.6 / 5.3
Gas G25 - 20 mbar - I 2ELL / 25 mbar - I 2L
Flow m3/h 4.31 6.15 1.24 / 4.31 1.85 / 6.15
Gas G31 - 30/37/50 mbar - I 3P
Flow m3/h 1.43 2.05 0.41 / 1.43 0.61 / 2.05
Burner chamber pressure mbar 0.2 0.2 0.2 0.2
Net T° of combusted gases °C 140 140 80 / 140 60 / 140
BE FR AT DK ES UK IT PT IE SE NL LU DE
I 2Er X
I 2E(S)B X
I 2H XXXXXXXX
I 3P X X XX XX
I 2L X
I 2ELL X
I 2E X
N.B.:
• The burners are preset in our factory for use with natural gas (equivalent to G20)
• An adjustement of the CO2 % is not allowed in Belgium. I 2E(S)B

16
BURNER DISMANTLING PROCEDURE
For safety reasons it is essential that you isolate the
power supply and the gas supply valve before carrying
out any work on the burner.
Dismantling the burner
1. Remove the burner cover.
2. Disconnect the gas connector and the electrical plugs of the
burner.
3. Disconnect the air supply pipe from the venturi.
4. Take off the burner chamber plate by undoing the two retaining
nuts.
Burner re-assembly
The burner is re-assembled in the reverse order of dismantling
(Step 4 to Step 1).
SETUP PROCEDURE IN THE EVENT OF FAN
REPLACEMENT
Fan speed for burner BG 2000-SV: (Fig. 15)
•Remove the green plug on the front of the fan to gain access to the
adjuster screw on the potentiometer (A).
BURNER CHARACTERISTICS
1. Gas flow adjuster screw
2. Offset pressure measuring point
3. Upstream gas pressure measuring point
4. Offset adjuster screw cover
12
3
4
PROCEDURE FOR SETTING THE % OF CO2
•Measure the burner combustion with an electronic flue gas analyser.
•Adjust the % of CO2to the figure shown in the table of setting
parameters on Page 15 by turning the gas flow adjuster screw on
the gas valve. (Fig. 16)
Turn counter-clockwise (more gas) ➠increases the % of CO2.
Turn clockwise (less gas) ➠reduces the % of CO2.
The offset (4) is set at the factory and requires no
adjustment.Nevertheless ACV recommends that you
check this setting. (Refer to the table of setting parameters).
You should contact your installer should you find any
significant deviation.
•Measure the speed of the impeller that is mounted on the motor
shaft. Adjust the speed of the fan according to the parameters
(Start, Min., Max.) listed in the table of setting parameters on Page
15 by turning the potentiometer screw (counter-clockwise to reduce
the fan speed and clockwise to increase it).
Fan speed for burner BG 2000-MV:
If the fan of a BG 2000-MV burner is replaced, the fan's speed is
controlled directly by the PWM connector which connects the fan to
the p.c.b.
The potentiometers on the p.c.b. (Start, Min. and Max.)
must be adjusted by an engineer approved by ACV.
A
Fig. 15
Fig. 16

17
BURNER CHARACTERISTICS
ELECTRODE DISTANCE AND GAP
•Distance between ionisation electrode and tube:
X = 10 to 15 mm (refer to Fig. 17)
•Distance between ignition electrode and tube:
Y = 4 to 7 mm (refer to Fig. 18)
•Ignition electrode gap:
Z = 2 to 5 mm (refer to Fig. 19)
BURNER MAINTENANCE (refer to Fig. 20)
1. After dismantling the burner, check the condition of the ignition
electrode (1) and ionisation electrode (2), the insulation (3) and
the burner chamber plate seal (4). Replace these items if
necessary.
2. Check the condition of the tube (5).
3. Re-assemble the burner and check burner ignition.
4. Check the gas connection for leaks.
5. Check the combustion parameters.
Fig. 18
Fig. 17
Fig. 19
Fig. 20
X
Y
Z
23
5
1
4

FAULT TABLE
18
BURNER CHARACTERISTICS
Corrective measures
Problems
Condensation in the chimney:
Smell of flue gas:
Insufficient heating:
The burner switches to safety mode after lighting:
Noisy pump:
Not enough hot water:
Pump not running:
Burner fails to light:
The manual reset high limit thermostat is tripped:
Reasons
Chimney is cold and/or not lined x1
Boiler T° is set too low xxx2
Chimney blocked x3
Combustion spillage in the chimney: x4
Insufficient or no ventilation in the boiler room x 5
Boiler clogged xxx6
Burner clogged xxxx 7
Room thermostat T° set too low x8
Pump jammed or faulty x x 9
Boiler switch is in the Summer position or is faulty x x x 10
Insufficient water in the system« x x x x x 11
Radiator valves closed x12
System not vented properly x x x 13
Low gas pressure xxx 14
Gas pipe too small xxx 15
Boiler thermostat/potentiometer faulty x x x 16
The electrical system is not earthed (properly) xx17
System fuses have blown x x x 18
System and/or boiler not vented properly x x x x 19
Not enough time allowed between large drawoffs x 20
Drawoff flow too fast x21
Room thermostat faulty or not turned on x x 22
Faulty Summer/Winter switch x x x x 23
Main switch is faulty or not turned on x x x x 24
Faulty NTC sensor x x x 25
Thermal reset high limit thermostat (95°C) activated x 26
Manual reset high limit thermostat (103°C) activated x 27
Faulty printed circuit board x 28
P.c.b. fuse blown x29
Faulty burner fan x30
No PWM signal x31
Ignition electrode faulty or incorrectly set x 32
Ionisation electrode faulty or incorrectly set x 33
Burner connectors not inserted properly x 34
Blocked gas valve x35
Faulty p.c.b. relay x 36
Boiler thermostat/potentiometer faulty x 37
Top of boiler not vented properly x 38
NTC sensor incorrectly inserted in its pocket x 39

19
BURNER CHARACTERISTICS
Corrective measures
Fit lining in the chimney 1
Increase the boiler T° 2
Check and clean the chimney 3
Check and clean the chimney 4
Comply with local requirements governing boiler room ventilation 5
Clean the burner and the boiler 6
Clean the burner and the boiler 7
Set the room thermostat to the required temperature 8
Free the pump or replace it 9
Move the switch to the Winter position or replace it 10
Properly fill and vent the system and the boiler 11
Open the radiator taps or adjust the thermostat valves 12
Properly fill and vent the system and the boiler 13
Check that the pipes and the meter are suitable for the system 14
Check that the pipes and the meter are suitable for the system 15
Replace the boiler thermostat/potentiometer 16
Ensure that the electrical system complies with regulations 17
Replace the fuses and look for the cause of the problem 18
Properly fill and vent the system and the boiler 19
Adhere to the performance data as indicated by ACV 20
Adhere to the performance data as indicated by ACV 21
Set the thermostat to the required temperature or replace it 22
Replace the Summer/Winter switch 23
Replace the main switch 24
Replace the NTC sensor 25
Replace the boiler thermostat/potentiometer 26
Abnormal situation 27
Replace the p.c.b. 28
Replace the p.c.b. but look for the cause of the malfunction 29
Replace the fan 30
Replace the p.c.b. if the fan turns but does not send a PWM signal 31
Replace the electrode or set it correctly 32
Replace the electrode or set it correctly 33
Insert the connectors correctly 34
Replace the gas valve and set it up according to the setting parameters 35
Replace the p.c.b. 36
Replace the boiler thermostat/potentiometer 37
Fill and vent the system and the boiler 38
Insert the NTC sensor in the pocket correctly 39
ACV provides details of training courses on the maintenance of BG 2000 burners
TABLE OF CORRECTIVE MEASURES