Wolf COB Technical specifications

Maintenance instructions
Oil condensing boiler
COB Boiler for heating
COB-TS / COB-CS Boiler with stratication cylinder
GB
Wolf GmbH · Postfach 1380 · D-84048 Mainburg · Tel. [phone] · Fax [phone] · Internet: www.wolf-heiztechnik.de
Document no: 3062549_201510 Subjekt to modications

23062549_201510
Index
Index .......................................................................................................Page
1. Safety instructions ...................................................................................................3
2. Component summary ..............................................................................................4
3. List of required parts................................................................................................5
4. Maintenance procedure......................................................................................6-10
5. Overview of the steps to be taken and maintenance report .............................11-12
Easy maintenance
Setting gauge
Maintenance tool
Cleaning hook

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1. Safety instructions
Terminal box: Danger from electrical voltage
Central connector, heat exchanger.
Risk of electrocution, risk of burning through hot components; leave
the appliance to cool down for approx. half an hour or use suitable
gloves.
The following symbols are used in conjunction with
these important instructions concerning personal safety,
as well as operational reliability.
"Safety instructions" are instructions with
which you must comply exactly to prevent
risk or injury to individuals and damage to the
unit.
Danger through 'live' electrical components!
NB: Switch OFF the ON/OFF switch before
removing the casing.
Never touch electrical components or
contacts when the ON/OFF switch is in the
ON position! This results in a risk of
electrocution that may lead to injury or death.
The main supply terminals are 'live' even
when the ON/OFF switch is in the OFF
position.
This indicates technical instructions which
you must observe to prevent damage and
malfunctions.
NB
Maintenance work must only be carried out by a
qualied heating contractor.
Annual maintenance and the exclusive use of
original Wolf spare parts are essential preconditions
for trouble-free operation and a long service life.
We therefore recommend you arrange a
maintenance contract with a local heating
contractor.
General notes
The use of old fuel oil with a sulphur content
> 1000 mg/kg fuel oil may lead to a need for more
cleaning, and therefore shorter maintenance
intervals.
NB

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2. Component summary
Burner in the maintenance position
Automatic air vent
Blast tube connection
Oil pump motor
Two-stage oil pump
Boiler sensor
High limit safety cut-out
Ignition transformer
Flue gas temperature
limiter
Oil nozzle
Flow switch
Mixer head
Drain valve
Sight tube, ame monitor
Flame monitor
Fan
Ignition electrodes
Heating surface, heat
exchanger

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3. List of required parts
Maintenance tools included in the COB standard
delivery
We recommend you have
the following as part of your
service kit:
Item Description Part no.
1Gasket for ue DN 100 86 12 016
2 Ignition electrodes 24 83 647
3 Seal ring for oil/air connection 89 05 738
4 Boiler sensor 27 41 058
6 Ignition cable 24 83 310
Standard delivery up to 12/2009 Standard delivery from 01/2010
The maintenance instructions supplied with the appliance must be observed when carrying out maintenance.
Setting gauge with scraper
Maintenance tool Cleaning brush
Setting gauge
Cleaning hook
Cleaning brush with
extension for COB-40
Maintenance tool
Maintenance requires the following: Pos. Description Part no.
1COB maintenance tools
Cleaning brush
Maintenance tool
Cleaning hook (from 01.2010)
Setting gauge (from 01.2010)
Standard delivery
24 83 520
24 83 394
24 83 916
24 83 879
2COB-15 maintenance set
Oil nozzle Danfoss 0,30/80°S
89 06 615
89 06 588
2COB-20 maintenance set
Oil nozzle Danfoss 0,40/80°S LE
89 05 809
89 05 812
2COB-29 maintenance set
Oil nozzle Danfoss 0,55/80°S LE
89 05 872
89 05 839
2COB-40 maintenance set
Oil nozzle Danfoss 0,55/80°S LE
Oil nozzle Danfoss 0,65/80°S LE
89 06 625
89 05 839
89 06 619
2.1 Also included in all maintenance sets
Combustion chamber lid seal ring
Silicone grease
Oil lter replacement cartridge 40 μm Siku
Flat gasket for ame tube/ame tube adaptor
with four oval head screws M 4x10
Seal ring for ame tube/ame tube adaptor
(87 x 2.5 mm)
Flame light tube end piece
Cable grommet
89 05 729
86 02 264
24 82 496
89 06 731
89 06 617
28 00 707
39 10 171
3
Replacement granulate for neutralisation COB-15/20/29 24 83 972
3Replacement granulate for neutralisation COB-40 24 83 974
4Measuring instrument for BimSch test -
5 Screwdriver -
6 2x SW 16 open-ended spanners -
7Allen key 4 mm -
8Allen key 6 mm -
Setting gauge
Maintenance tool
Cleaning hook

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4. Maintenance procedure
6. Pivot the control
unit downwards.
7. Unplug
the central
connector.
8. Loosen the three 6 mm Allen screws on the burner ange
(do not unscrew them completely).
9. Rotate the burner unit approx. 1 cm to the right
(clockwise).
Allen screws
1. Set program selector (l.h. rotary selector) to "Standby"
on the BM programming module.
2. Pivot the control unit lid down and switch off the oil
condensing boiler at the ON/OFF switch.
ON/OFF switch
5. Pull the upper
casing lid forwards
and lift off.
Danger of burning
Before any maintenance work, leave the
appliance to cool down for half an hour or use
suitable gloves.
The mains terminals are 'live' even when the
ON/OFF switch has been switched OFF.
3. Disconnect the system from the power supply.
Screws left/right
4. Undo the screws on the left/right and unhook the front
casing by pulling it forwards and lifting it upwards.

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4. Maintenance procedure
Allen screw
11. Undo the 4mm Allen screw on the mixer head and
remove the mixer head.
12. Pull the ignition cable away from the ignition electrode
and place the mixer head to one side.
Ignition cable
13. Nozzle change with SW 16 open-ended spanner.
When attaching or detaching the nozzle, counter the
torque with a second SW16 open-ended spanner.
Note: Always use a Wolf original spare parts nozzle
(see page 5)
Risk of burning through hot components
10. Lift the burner unit upwards out of the combustion
chamber lid and hang in place in the maintenance
position, as shown in the gure.
14. Clean or replace the ame light tube end piece on the
mixer head
Never remove or dismantle the mixer head;
this applies particularly to the brass washer.
Flame light tube
end piece, mixer
head
Sight tube,
ame monitor
15. Plug in the ignition cable
Insert the mixer head until it reaches the end-stop. The
ame light tube end piece of the mixer head must be
aligned with the ame monitor sight tube.
Secure again using a 4 mm Allen screw
NB
Boiler Mixer head
versions
Oil nozzle Part no.
COB-15 Standard Danfoss 0,30/80°S 89 06 588
COB-20 Standard Danfoss 0,40/80°S LE 89 05 812
COB-29 Standard Danfoss 0,55/80°S LE 89 05 839
COB-40 Standard Danfoss 0,65/80°S LE 89 06 619
Pipe Danfoss 0,55/80°S LE 89 05 839
Standard Pipe
Mixer head versions:

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20. Undo the wing screws on the combustion
chamber lid.
Wing
screws
Maintenance tool
22. Hook the maintenance tool into the combustion chamber
and pull out the chamber.
18. Check 3: spacing of ignition electrodes OK?
The electrode spacing must be 3 mm.
Replace ignition electrode if necessary.
4. Maintenance procedure
17. Check 2: position of the ignition electrodes OK?
The electrode tips must point towards upper hole 1 of
the setting gauge.
Check 1 COB-20
Check 1 COB-29
Check 3
Check 2
To clean the heat
exchanger ns
Setting gauge (standard delivery COB up to 12/2009)
Setting gauge (standard delivery COB from 01/2010)
Check 1
COB-20
Check 1 COB-29/40
Check 3
Check 2
Check 1 COB-15
2,6
3,5
2,0
19. Before cleaning the heat exchanger, remove the siphon.
A collecting vessel can then be placed under the now
open condensate drain connection (siphon connection).
Siphon
21. Lift off the combustion chamber lid and place
to one side.
Carry out the following checks with the maintenance tool:
16. Check 1: mixer head inserted up to the end-stop?
Check distance between nozzle and mixer head using
the setting gauge (COB15 : 2.0 mm, COB20 : 2.6 mm,
COB29/40 : 3.5mm).

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Clean the condensate pan:
26. Use a vacuum cleaner to remove dirt from the
condensate pan or ush with water through the siphon
aperture in the collecting vessel.
27. Clean, rell and ret the siphon.
Note:
When installing an empty siphon, ue gas may escape
and start problems may occur, in which case proper
measurement of CO2 would not be guaranteed.
28. Flush the neutralisation and condensate pump (if
installed) with water.
29. Top up neutralisation granulate.
30. Replace the neutralising system’s activated charcoal.
31. Reattach connecting lines.
32. Replace oil lter insert.
Please note that only lter cartridges with 25 - 40 μm are
permissible.
Assembly is carried out in reverse order, observing the
following instructions:
33. Use the maintenance tool to slide the cleaned
displacement device back into the heat exchanger.
Never let the displacement device drop into the heat
exchanger, as this could damage the displacement device.
NB
Assembly
34. Replace combustion chamber lid seal ring.
35. Before retting the combustion chamber lid, lubricate the
seal ring on the combustion chamber lid with silicone
grease.
Note:
If the ame tube or ame tube adaptor was also removed
while maintenance was being carried out, replace the seal
ring or gasket.
COB up to 12/2009: Gasket
COB from 01/2010: Seal ring: 87 x 2.5 mm
Seal ring,
combustion
chamber lid
4. Maintenance procedure
23. Rotate the maintenance tool 90°, hook into the lifting eye
of the displacement device and pull out.
Soak displacement device in water if stuck. After
around two minutes, the displacement device can
then be removed from the heat exchanger using the
maintenance tool. Never use force (e.g. a hammer) to
loosen the displacement device, as this may damage it.
NB
24. Remove cleaning brush from the back panel. Brush dry,
easily removable deposits into the condensate pan.
Use a vacuum cleaner to remove the loosened dirt
from the condensate pan. Alternatively, ush the dirt
with water into the collecting vessel through the siphon
aperture.
25.
Soak stubborn encrusted deposits in water for at least
2 min.
Unscrew the brush head from the handle and replace
with the cleaning hook. Then scrape off deposits with the
cleaning hook.
Swap the cleaning attachments back again and hook the
cleaning brush into the back panel.
Chemical cleaning agents can corrode the heat
exchanger and are not permissible.
NB

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50. Flue gas test
Carry out the test in emissions test mode and enter the values
in maintenance report.
Re-adjust the CO2 content, if required (BM - parameters, boiler
HG00, pipe length adjustment)
(see installation instructions).
CO2set value, boiler closed stage 1 and stage 2
CO2max.13,5 ± 0,3%
O2min. 2,7 %
46. Reset the MCB.
47. Switch on the oil condensing boiler at the ON/OFF
switch.
48. To test ue gas emissions,
set the temperature selector
to emissions test mode.
Restart / ue gas test
Emissions test mode position
Before restarting:
44. Check the system pressure, and top up heating water if
required.
45. When you notice a loss of water, check the expansion
vessel inlet pressure and increase it, if required, to
0.75 bar. The heating circuit must be at zero pressure.
Fill the system.
49 Carry out an inlet air test.
"Flue gas" test port "Inlet air" test
port
If the CO2> 0.2%, check that there are no leaks in
the ue:
36. Ret combustion chamber lid and secure with three wing
screws.
37. Check oil/air connection seal ring for damage and
replace if necessary.
38. Take the burner unit out of the maintenance position and,
with the mixing appliance at the front, slide it carefully
into the combustion chamber, making sure you check on
the position of the oil/air connection seal ring.
39. Rotate the burner unit approx. 1 cm to the left and secure
with three 6 mm Allen screws.
40. Plug in central connector.
41. Flip up the control unit.
42. Replace the upper casing lid.
43. Hook in the front casing at the bottom and secure with
the screws at the top (left and right).
52. Pull the cable away from the lug.
53. Test the current between the lug and the cable.
The current must be > 0.3 mA.
(Test only works when the cylinder has been lled.)
54. If the current is < 0.3 mA, check the anode and replace it
if necessary.
(Protective anode, insulated, CS part no. 24 83 629).
Release the cylinder pressure before replacing the
anode. Switch off the DHW circulation pump, shut off the
DHW and turn on a tap inside the house.
55. Reafx the cable to the lug.
Checking the protective anode on
the TS / CS stratication cylinder
Protective
anode at the
front top of
the cylinder
Cleaning brush
Seal ring for oil/
air connection
Combustion
chamber lid
Central
connector
4. Maintenance procedure
51. Check control accessories.
The display must show BUS connection
Boiler Oil nozzle Pump pressure
Stage 1 Stage 2
COB-15 Danfoss 0,30/80°S 5,0 ± 1,0 bar 12,0 ± 2,5 bar
COB-20 Danfoss 0,40/80°S LE 8,5 ± 1,0 bar 16,8 ± 2,5 bar
COB-29 Danfoss 0,55/80°S LE 8,5 ± 1,0 bar 16,8 ± 2,5 bar
COB-40 Danfoss 0,65/80°S LE 9,8 ± 1,0 bar 18,0 ± 2,5 bar
Danfoss 0,55/80°S LE 11,0 ± 1,0 bar 23,5 ± 2,5 bar

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5. Overview of the steps to be taken
and maintenance report
Item Step Report item
Date
1Set the program selector to "Standby" on the BM programming module.
2Pivot the control unit lid down and switch off the oil condensing boiler at the ON/OFF
switch.
3Disconnect the system from the power supply.
4Undo the screws on the left/right and unhook the front casing by lifting it upwards.
5Pull the upper casing lid forwards and lift off.
6Pivot the control unit downwards.
7Unplug the central connector.
8Loosen the three 6 mm Allen screws on the burner ange (do not unscrew them
completely).
9Rotate the burner unit approx. 1 cm to the right.
10 Lift the burner unit upwards out of the combustion chamber lid and hang in place in
the maintenance position.
11 Undo the 4 mm Allen screw on the mixer head and remove the mixer head.
12 Pull the ignition cable away from the ignition electrodes and place the mixer head to
one side.
13
Nozzle change with SW 16 open-ended spanner - counter the torque with second spanner.
14 Clean the mixer head; do not dismantle.
15 Push ignition cable onto ignition electrodes. Insert the mixer head until it reaches the
end-stop.
16 Checking with the setting gauge: mixer head inserted up to the end-stop.
17 Checking with the setting gauge: position of the ignition electrode OK.
18 Checking with the setting gauge: ignition electrode spacing OK.
19 Remove and empty the siphon. Place collecting vessel underneath the siphon
connection.
20 Undo the three wing screws on the combustion chamber lid.
21 Lift off the combustion chamber lid and place to one side.
22
Hook the maintenance tool into the combustion chamber at the top and pull out the chamber.
23 Rotate the maintenance tool 90°, hook into the lifting eye of the displacement device
and pull out.
24 Take the cleaning brush off the back wall and clean the heat exchanger.
25 Scrape off stubborn deposits with the cleaning hook.
26 Use a vacuum cleaner to remove dirt from the condensate pan or ush with water.
27 Clean, rell and ret the siphon.
28 Flush the neutralisation and condensate pump (if installed) with water.
29 Top up neutralisation granulate.
30 Replace the neutralising system’s activated charcoal.
31 Reattach connecting lines.
32 Replace oil lter insert.
33 Position displacement device at the bottom and the combustion chamber on top using
the maintenance tool.
34 Replace combustion chamber lid seal ring.
35 Lubricate the seal ring on the combustion chamber lid with silicone grease.
36 Ret the combustion chamber lid and secure with wing screws.
37 Check oil/air connection gasket for damage and replace if necessary.
38
Take the burner unit out of the maintenance position and slide it into the combustion chamber.
39 Rotate the burner unit approx. 1 cm to the left and secure with three screws.
40 Plug in central connector.

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Item Step Report item
41 Flip up the control unit.
42 Replace the upper casing lid.
43 Hook in the front casing at the bottom and secure with two screws at the top.
44 Check the system pressure, and top up heating water if required.
45 When you notice a loss of water, check the expansion vessel inlet pressure.
Test run
46 Reset the MCB.
47 Switch on the oil condensing boiler at the ON/OFF switch.
48 To test ue gas emissions, set the temperature selector to emissions test mode or, in
the case of the BM programming module, set the program selector switch to emissions
test mode.
49 Carry out an inlet air test.
If the CO2 > 0.2%, check that there are no leaks in the ue.
50 Carry out ue gas testing in emissions test mode.
Inlet air temperature
Flue gas temperature stage 1
Carbon dioxide content (CO2) stage 1
Flue gas temperature stage 2
Carbon dioxide content (CO2) stage 2
Flue gas loss
51 Check control accessories.
Check the protective anode on the CS stratication cylinder (if installed).
52 Pull the cable away from the lug.
53 Test the current between the lug at the protective anode and the cable. (> 0.3 mA)
(Testing only works when the cylinder has been lled.)
54 If the current is < 0.3 mA, check the anode, and replace if necessary.
55 Reafx the cable to the lug.
Conrm maintenance (company stamp, signature)
Date:
Conrm maintenance (company stamp, signature)
Date:
Conrm maintenance (company stamp, signature)
Date:
Conrm maintenance (company stamp, signature)
Date:
Conrm maintenance (company stamp, signature)
Date:
Conrm maintenance (company stamp, signature)
Date:
5. Overview of the steps to be taken
and maintenance report