Wolf COB Quick start guide

Installation instructions and
technical guide
Oil condensing boiler
COB Boiler for heating
COB-TS Boilerwithstraticationcylinder
Document no.: 3062547_201507 Subject to modications GB
Wolf GmbH · Postfach 1380 · D-84048 Mainburg · Tel. [phone] · Fax [phone] · Internet: www.wolf-heiztechnik.de

23062547_201507
Index
Index ...................................................................................................................Page
1. Safety instructions ....................................................................................................3
2. COB/COB-TS installation/standard delivery.............................................................4
3. Specication ......................................................................................................... 5-7
4. Layout/description of components............................................................................8
5. System examples .....................................................................................................9
6. Standards and regulations......................................................................................10
7. Installation instructions ...........................................................................................11
Installation ............................................................................................................ 12-21
8. General notes........................................................................................ 12-13
9. Installation accessories...............................................................................14
10. Boiler/TS cylinder......................................................................................15
11. Installation examples.................................................................................16
12. Oil connection in a single-line system.......................................................17
13. Siphon/neutralisation/condensate pump...................................................18
14. Installation of a balanced ue system .......................................................19
15. Filling the heating system..........................................................................20
16. Electrical connection .................................................................................21
Control unit .......................................................................................................... 22-31
17. Control unit.......................................................................................... 22-23
18. Displaying/modifying control parameters/Settings report..........................24
19. Contractor level parameters................................................................ 25-31
Cascade operation ............................................................................................... 32-39
20. Control/specication/notes........................................................................32
21. Flue system design ...................................................................................33
22. Flue gas header version............................................................................34
23. Flue gas header version / notes.......................................................... 35-36
24. Flue gas damper installation .....................................................................37
25. Flue gas damper installation / wiring diagram...........................................38
26. Flue gas damper tightness test.................................................................39
Commissioning..................................................................................................... 40-44
27. Commissioning with Wolf control accessories (BM)........................... 40-41
28. Commissioning without Wolf control accessories (BM)..................... 42-43
29. Commissioning report ...............................................................................44
30. Maintenance and design data............................................................. 45-46
31. Design information - balanced ue system ......................................... 47-55
32. Wiring diagram..........................................................................................56
33. Reset.........................................................................................................57
34. Troubleshooting................................................................................... 58-59
35. Product che according to Regulation (EU) no. 811/2013 .................. 60-63
36. Technical parameters according to EU regulation no. 813/2013...............64
37. Notes................................................................................................... 65-66
37. EC Declaration of Conformity....................................................................67

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1.Safetyinstructions
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risks
andinjuriestoindividualsandmateriallosses.
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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
Diagram: Terminal box: Danger from electrical voltage
Diagram: Danger from electrical voltage and hot components
Maintenance
NB - only a heating contractor has the
necessaryknowledgeandexpertise!
- According to paragraph 10(3) EnEV the user is required to
have the system serviced regularly to ensure the reliable
and safe function of the oil condensing boiler.
- The boiler should be serviced annually.
- Maintenance is explicitly detailed in the installation and
maintenance instructions.
- Isolate the boiler from the power supply before any
maintenance work is carried out.
- After a service and before the oil condensing boiler is
restarted, check that all components that were removed for
maintenance have been retted correctly.
- We recommend you arrange a maintenance contract with
an approved heating contractor.

43062547_201507
2. COB/COB-TS installation/
standarddelivery
Oil condensing boiler
Connection adaptor for ue gas with test nipple
Siphon with hose
Stainless steel cleaning brush
Maintenance tool with setting gauge
Protective cap for maintenance
COB/TS installation instructions
COB/TS operating instructions
COB/TS maintenance instructions
Oil lter insert 40 μm
Oil condensing boiler
Stratication cylinder
Connection adaptor for ue gas with test nipple
Siphon with hose
Stainless steel cleaning brush
Maintenance tool with setting gauge
Protective cap for maintenance
COB/TS installation instructions
COB/TS operating instructions
COB/TS maintenance instructions
Oil lter insert 40 μm
COBstandarddelivery COB-TSstandarddelivery(notwithCOB-40)
The appliance is fully assembled with the casing tted, and the control unit is fully wired.
COB-15/20/29/40 oil condensing boiler
for heating with connection option for
DHW cylinder e.g. SE-2, SEM-1, BSP
COB-15/20/29 oil condensing boiler
with TS stratication cylinder,
on the right, oorstanding
COB-15/20/29 oil condensing boiler
with TS stratication cylinder,
on the left, oorstanding
COB-15/20/29 oil condensing boiler
with TS stratication cylinder,
at the back, oorstanding
COB-15/20/29: 1290
566
1210
COB-15/20/29: 1290
1132
605
COB-15/20/29: 1290
605
1132
COB-15/20/29: 1290 COB-40: 1490
566
605

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3062547_201507
3.Specication
Balanced ue
connection
Opening the casing Closing the casing
Type plate
Return
Optional xing point
for oil lter
Flow
Recesses for
individual piping
of the heating
connections
Entries for oil
hoses (optional)
Condensate
drain level
1084
566
605
603
122
COB-15/20/29: 1290
COB-40: 1490
462
203
COB-40: 1209
COB-15/20: 919
194
516
260
426
COB-29: 930

63062547_201507
3.Specication
Oil condensing boiler COB-15 COB-15/TS COB-20 COB-20/TS
Rated output at 80/60 °C, stage 1/2 kW 9,0 / 14,4 9,0 / 14,4 13,1 / 19,0 13,1 / 19,0
Rated output at 50/30 °C, stage 1/2 kW 9,5 / 15,1 9,5 / 15,1 13,9 / 20,0 13,9 / 20,0
Rated load, stage 1/2 kW 9,2 / 14,7 9,2 / 14,7 13,5 / 19,6 13,5 / 19,6
Oil throughput, stage 1/2 kg/h 0,86 / 1,38 0,86 / 1,38 1,15 / 1,66 1,15 / 1,66
Rated capacity TS (equivalent) Ltr -160 (200) -160 (240)
Constant cylinder output TS kW/Ltr/h - 15 / 370 - 20 / 490
Performance factor TS NL60 - 3,5 -4,5
DHW output TS l/10min - 250 - 280
Standby input TS kWh/24h -1,47 -1,47
Max, permissible cold water supply pressure TS bar - 10 - 10
Minimum anode current, protective magnesium anode mA - > 0,3 -> 0,3
External diameter, heating ow G 1½" 1½" 1½" 1½"
External diameter, heating return G 1½" 1½" 1½" 1½"
Condensate connection 1" 1" 1" 1"
Oil connection, ow/return hoses G 3/8" 3/8" 3/8" 3/8"
Cold water inlet G - 3/4" - 3/4"
DHW connection G - 3/4" - 3/4"
DHW circulation connection G - 3/4" - 3/4"
Height mm 1290 1290 1290 1290
Width mm 566 1132 566 1132
Depth mm 605 605 605 605
Boiler weight kg 92 92 92 92
Cylinder weight kg - 76 - 76
Balanced ue connection mm 80/125 80/125 80/125 80/125
Balanced ue routing type B23, B33, C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
Fuel oil Fuel oil EL, low sulphur, bio-oil B10 or fuel oil EL standard
Nozzle* Danfoss
0,30 / 80°S Danfoss 0,40 / 80°S LE
Fuel oil lter Siku max, 40 μm
CO2 setting stage 1 and stage 2 %13,5 ± 0,3 13,5 ± 0,3 13,5 ± 0,3 13,5 ± 0,3
Pump pressure stage 1 bar 5,0 ± 1,0 5,0 ± 1,0 8,5 ± 1 8,5 ± 1
Pump pressure stage 2 bar 12,0 ± 2,5 12,0 ± 2,5 16,8 ± 2,5 16,8 ± 2,5
Maximum negative pressure in oil lines bar -0,3 -0,3 -0,3 -0,3
Flow temperature, factory setting °C 80 80 80 80
Max, ow temperature °C 85 85 85 85
Heating water pressure drop at Δ T=20 K mbar 3,6 3,6 6 6
Heating water pressure drop at Δ T=10 K mbar 12 12 21 21
Max, permissible boiler pressure bar 3333
Heating surface, heating water heat exchanger m² 2,55 2,55 2,55 2,55
Heat exchanger water content Ltr, 7,5 7,5 7,5 7,5
Seasonal efciency [to DIN] at 40/30 °C (Hi/ Hs)% 105 / 99 105 / 99 105 / 99 105 / 99
Seasonal efciency [to DIN] at 75/60 °C (Hi/ Hs)% 100 / 95 100 / 95 101 / 96 101 / 96
Efciency at rated load at 80/60 °C (Hi/ Hs)% 97 / 92 97 / 92 97 / 92 97 / 92
Efciency at 30% partial load and TR=30 °C (Hi/ Hs)% 103 / 97 103 / 97 103 / 97 103 / 97
Boiler standby loss qB at 70 °C (EnEv) %0,75 0,75 0,75 0,75
SEDBUK band AAAA
SAP 2009 annual efciency % 91.4 91.4 91.4 91.4
Rated heat input (stage 2):
Flue gas mass ow rate g/s 6,45 6,45 9,06 9,06
Flue gas temperature 50/30 - 80/60 °C °C 40 - 63 40 - 63 49 - 69 49 - 69
Available fan draught Pa 65 65 65 65
Lowest heat input (stage 1):
Flue gas mass ow rate g/s 4,04 4,04 6,28 6,28
Flue gas temperature 50/30 - 80/60 °C °C 35 - 55 35 - 55 40 - 61 40 - 61
Available fan draught Pa 32 32 45 45
Electrical connection V~/Hz 230/50 230/50 230/50 230/50
Integral fuse (medium slow) A5 A 5 A 5 A 5 A
Power consumption, stage 1 / stage 2 W 86/128 86/128 99/139 99/139
Protection IP20 IP20 IP20 IP20
Condensate volume at 40/30 °C Ltr,/h 1,2 1,2 1,6 1,6
Condensate pH value approx, 3 approx, 3 approx, 3 approx, 3
CE ID CE-0085BS0326
* These nozzles comply with the emission requirements according to RAL-UZ 46 and ensure reliable operation. No other nozzles are permissible!

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3062547_201507
* These nozzles comply with the emission requirements according to RAL-UZ 46 and ensure reliable operation. No other nozzles are permissible!
Oil condensing boiler COB-29 COB-29/TS COB-40
Rated output at 80/60 °C, stage 1/2 kW 18,5 / 28,2 18,5 / 28,2 25,3 / 38,0
Rated output at 50/30 °C, stage 1/2 kW 19,6 / 29,6 19,6 / 29,6 26,8 / 40,0
Rated load, stage 1/2 kW 19,0 / 29,0 19,0 / 29,0 26,0 / 38,8
Oil throughput, stage 1/2 kg/h 1,60 / 2,45 1,60 / 2,45 2,44 / 3,64
Rated capacity TS (equivalent) Ltr -160 (260) -
Constant cylinder output TS kW/Ltr/h - 29 / 710 -
Performance factor TS NL60 - 5,0 -
DHW output TS l/10min - 300 -
Standby input TS kWh/24h -1,47 -
Max. permissible cold water supply pressure TS bar - 10 -
Minimum anode current, protective magnesium anode mA - > 0,3 -
External diameter, heating ow G 1½" 1½" 1½"
External diameter, heating return G 1½" 1½" 1½"
Condensate connection 1" 1" 1"
Oil connection, ow/return hoses G 3/8" 3/8" 3/8"
Cold water inlet G - 3/4" -
DHW connection G - 3/4" -
DHW circulation connection G - 3/4" -
Height mm 1290 1290 1490
Width mm 566 1132 566
Depth mm 605 605 605
Boiler weight kg 99 99 122
Cylinder weight kg - 76 -
Balanced ue connection mm 80/125 80/125 110/160
Balanced ue routing Type B23, B33, C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
Fuel oil Fuel oil EL, low sulphur, bio-oil B10 or fuel oil EL standard
Nozzle* Danfoss 0,55 / 80° S LE
Fuel oil lter Siku max, 40 μm
CO2 setting stage 1 and stage 2 %13,5 ± 0,3 13,5 ± 0,3 13,5 ± 0,3
Pump pressure stage 1 bar 8,5 ± 1 8,5 ± 1 11,0 ± 1,0
Pump pressure stage 2 bar 16,8 ± 2,5 16,8 ± 2,5 23,5 ± 2,5
Maximum negative pressure in oil lines bar -0,3 -0,3 -0,3
Flow temperature, factory setting °C 80 80 80
Max. ow temperature °C 85 85 85
Heating water pressure drop at Δ T=20 K mbar 17 17 54
Heating water pressure drop at Δ T=10 K mbar 55 55 205
Max. permissible boiler pressure bar 333
Heating surface, heating water heat exchanger m² 3,05 3,05 3,85
Heat exchanger water content Ltr. 9,0 9,0 11,5
Seasonal efciency [to DIN] at 40/30 °C (Hi/ Hs)% 105 / 99 105 / 99 104 / 98
Seasonal efciency [to DIN] at 75/60 °C (Hi/ Hs)% 101 / 96 101 / 96 98 / 93
Efciency at rated load at 80/60 °C (Hi/ Hs)% 97 / 92 97 / 92 98 / 93
Efciency at 30% partial load and TR=30 °C (Hi/ Hs)% 103 / 97 103 / 97 103 / 97
Boiler standby loss qB at 70 °C (EnEV) %0,55 0,55 0,45
SEDBUK band AAA
SAP 2009 annual efciency % 91.4 91.4 91.4
Rated heat input (stage 2):
Flue gas mass ow rate g/s 13,33 13,33 17,51
Flue gas temperature 50/30 - 80/60 °C °C 55 - 76 55 - 76 56 - 83
Available fan draught Pa 105 105 150
Lowest heat input (stage 1):
Flue gas mass ow rate g/s 9,05 9,05 10,91
Flue gas temperature 50/30 - 80/60 °C °C 40 - 64 40 - 64 43 - 68
Available fan draught Pa 55 55 72
Electrical connection V~/Hz 230/50 230/50 230/50
Integral fuse (medium slow) A5 A 5 A 5 A
Power consumption, stage 1 / stage 2 W 129 / 178 129 / 178 126 / 205
Protection IP20 IP20 IP20
Condensate volume at 40/30 °C Ltr./h 2,2 2,2 2,8
Condensate pH value approx, 3 approx, 3 approx, 3
CE ID CE-0085BS0326
3.Specication

83062547_201507
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8
9
10 11
2
3
65
4
1
COB-TS oil condensing boiler with stratication cylinder
Cold water
DHW
DHW circulation
Oil condensing boiler Straticationcylinder
1 Cylinder heating from above with deector and divider
2 DHW draw-off at the highest point
3 Cold water supply with control and
distribution appliance
4 Cold water draw-off for cylinder heating
5 DHW circulation line
6 Protective magnesium anode
7 Sensor well for cylinder temperature sensor
8 Drain (in standard delivery)
9 Siphon
10 Neutralising system (accessory)
11 Condensate pump (accessory)
TSstraticationcylindercannotbeinstalledwithCOB-40
NB
4.Layoutofcomponents

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5. Description of components
Automatic air vent
Regulated
stratication pump
Blast tube
connection
Plate-type heat exchanger
Oil pump motor
Immersion pipe,
cylinder sensor
Two-stage oil pump
Stratication sensor
Boiler
sensor
Cylinder primary pump
High limit safety cut-out
Heating return 1"
Ignition
transformer
Flue gas temperature
limiter
Expansion vessel 8 l
(accessory)
Water pressure switch
Heating ow 1"
Drain valve
DHW circulation
(accessory)
Drain
Protective anode
(under cover)
Flame monitor
Fan
Cold water connection
¾" (optional accessory)
COB component description
TS component description
Hot water connection ¾"

10 3062547_201507
To save energy and protect against scaling
if the total hardness is greater than 15 °dH
(2.5mol/m³),theDHWtemperaturemaybeset
to a maximum of 50 °C.
If the total hardness is greater than 20 °dH
(3.58mol/m³), we recommend using a water
treatmentfacilityinthecoldwatersupplyline
forDHWheating,toprolongthemaintenance
interval(descalingDHWheatexchanger).
COB / COB-TS oil condensing boiler
Two-stage oil condensing boiler with electronic ignition and
electronic ue gas monitoring, for low temperature heating
and DHW heating in heating systems with ow temperatures
of up to 85 °C and a permissible operating pressure of 3 bar.
The COB complies with the following regulations:
EC Directives:
- 92/42/EEC Efciency Directive
- 2004/108/EC EMC Directive
- 2006/95/EC Low Voltage Directive
DIN / EN Standards:
EN 230, EN 303, EN 304, EN 15034, EN 15035, EN 12828,
EN 61000-3-2, EN 61000-3-3, EN 61000-4-3, EN 55014-1,
EN 60335-1, EN 60335-2-102, EN 60529
Stratication cylinder type TS made of steel S235JR with
connections to the on-site pipework.
Corrosion protection through enamel coating on the inside
of the cylinder as per DIN 4753 and additional corrosion
protection through a protective magnesium anode.
Openueoilcondensingboilersmustonlybe
installed in a room which complies with the
appropriateventilationrequirements.Otherwise
there is a risk of asphyxiation or poisoning.
Read these installation and maintenance
instructions before installing the boiler. Also
take the technical guide into consideration.
Note: The DHW temperature should be limited to a
maximum of 55 °C if the hardness of the hot
water is more than 2.86 mmol/l. A reduced DHW
temperature prevents excessive scaling. This
cutsthelevelofmaintenanceandenergyinput.
6. Standards and regulations
Obtainthepermissionofyourlocaluegasinspectorand
thelowerwaterauthoritypriortotheinstallationofWolf
oil condensing boilers.
Wolf oil condensing boilers must only be installed by a
recognised heating contractor. This heating contractor
will also be responsible for the proper installation and the
commissioning of the heating system. The DVGW Code of
Practice G676, boiler room guidelines or Building Regulations
relating to the construction and installation of central boiler
rooms and fuel storage facilities apply.
Thefollowingregulations,rulesandguidelinesmustbe
observedduringinstallation:
- Energy Savings Act (EnEG) and related directives
- EnEV Energy Savings Order
- Technical regulations for oil installations IWO-TRÖL 2006
in the currently applicable version
Note: Pleasereadtheseinstructionscarefullybefore
the installation and keep them in a safe place.
Please also note the technical information in
the appendix.
Any damage or loss resulting from technical
modicationstothecontrolunitortothecontrol
componentsareexcludedfromourliability.
- DIN 1988 Technical rules for DHW installations
- DIN EN 12831 Procedure for calculating the standard
heating load
- EN 12828 Heating systems in buildings
Designing DHW heating systems
- DIN 4701 Rules for calculating the heat demand of
buildings
-
DIN 4751 Part 3 Safety equipment for heating systems with ow
temperatures of up to 95 °C
- DIN 18160 Flue gas systems
- DIN EN 1717 Protection of DHW against contamination in
DHW installations
- ATV-A-251 Materials for drain pipes for condensate from
condensing boilers
- VDI 2035 Avoiding damage in DHW heating systems
Scaling in general water and DHW heating
systems
Local regulations from building and
industry regulatory agencies (mainly covered
by the local ue gas inspector)
- DIN VDE 0100 Regulations regarding the installation of
high-voltage systems with rated voltages up
to 1000 V
- VDE 0105 Operation of high-voltage systems, general
considerations
- DIN EN 60529 Protection through casings

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7. Installation instructions
Transport
Boiler/straticationcylinder
- The boiler and the stratication cylinder are transported, fully packaged, on a pallet
- A sack truck is a suitable means of transportation
- Position the sack truck behind the boiler or stratication cylinder, secure with a strap
and transport to the installation location
The COB and TS are installed adjacent to the wall, which means that a clearance of
70 cm only needs to be observed at the front. When installing the boiler, you should
observe the recommended wall clearances in order to simplify assembly, maintenance
and servicing.
Recommended minimum
wall clearance
Installation information - Install the boiler or boiler plus DHW cylinder on a level
surface which is substantial enough to carry its weight.
- Level the boiler and stratication cylinder horizontally using
adjustable feet.
Adjustable feet
- Remove strap and packaging
- Remove the four xing screws on the pallet
- Lift the boiler and/or stratication cylinder off the pallet
COB with
TS behind
- The boiler must only be installed in a room that is protected from frost.
Drain the boiler, stratication cylinder and heating system if there is a risk
of frost when the system has been shut down.
- Boilers should not be installed in a room that is subject to aggressive vapours
or in very dusty or highly humid conditions (workshops, washrooms, hobby
rooms, etc.).
- The combustion air must be free from halogenated hydrocarbons.
- A surface temperature of 40 °C is not exceeded in the case of COB if
operated as intended. The respective national re regulations are to be
observed in the case of installation in oil storage rooms.
NB
NB
NB
COB with
TS right
or left
COB-40
minimum
room height
COB
70 cm 70 cm
70 cm
70 cm
70 cm
190 cm

12 3062547_201507
8. Installation - general notes
Note:
Provide a ll and drain valve at the lowest point in the
system.
Safetyequipment
The COB has not been tted with an expansion vessel at
the factory. This must be tted externally (available from the
Wolf accessories range). The expansion vessel must be in
accordance with DIN 4807.
Thereshouldnotbeashut-offvalvebetweenthe
expansionvesselandtheoilcondensingboiler,
because otherwise the pressure build-up would
permanentlydamagetheboilerduringheating.
Thereisariskofsystemcomponentsrupturing,
givingrisetoariskofscalding.
Exceptions are cap valves upstream of the expansion vessel.
The safety assembly from the Wolf accessories range includes
an integral 3 bar safety valve. Route the blow-off line into a
drain outlet.
The minimum system pressure is 1.0 bar.
The oil condensing boiler is permitted exclusively for sealed
systems of up to 3 bar. The maximum ow temperature is
factory-set to 80 °C and may be adjusted to 90 °C if required.
Generally, the maximum ow temperature is 80 °C for DHW
operation.
There is no need for a minimum throughput at flow
temperatures below 80 °C.
We recommend a heating water pH value of between
pH 6.5 and pH 8.5.
Wolf does not assume liability for any damage to the heat
exchanger caused by oxygen diffusion in the heating water. In
the event of oxygen penetrating the system, we recommend
a system separation through the interconnection of a heat
exchanger.
If the limit curve is exceeded, an appropriate portion of the
system water must be treated.
Example:
Total hardness of the domestic hot water: 19°dH
System volume: 1 m³
This means at least 0.3 m³ = 300 l must be desalinated.
Permissible methods:
- Desalination using mixed-bed cartridges. These are
multi-stage ion exchangers. We recommend, for
example, using the "Megall Alu" cartridges from
Taconova for the rst ll, and later as and when required.
- Topping up with distilled water.
Total hardness in °dH
System volume in m3
Water treatment
necessary
Water treatment not
necessary
0.3 m3
Inhibitors (substances to prevent corrosion
and limescale deposits) and antifreeze are
not permitted. There is a risk of damage to
the boiler resulting from poor heat transfer or
corrosion.
Heating water
The return line to the appliance should have a dirt trap.
Deposits in the heat exchanger may lead to boiling noise, a
drop in performance or faults in the appliance.
Domestic hot water may be used as ll water and top-up water.
The addition of chemicals or de-scaling using single- stage ion
exchangers is not permissible.
In the case of high-volume systems or those where large top-
up water volumes (e.g. due to water losses) are required, the
following values must be observed.

13
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Wehighlyrecommendthatyouuselowsulphurfueloil
toprotecttheenvironment.
Information on the use of bio-oil blends:
1. Permissible bio-oil percentages
The COB (from date of manufacture May 2010) can be
operated with fuel oil with up to 10 % alternative constituents
–B10- to DIN V 51603-6.
2.Bio-oilquality
The bio-oil must comply with EN 14213 when the customer
tank is lled.
3. Oil storage tanks
The customer must obtain written conrmation from the
manufacturer or supplier regarding the suitability of the tank
for the use of bio-oils, giving the maximum permitted FAME
percentage. It must be ensured that the tank ttings, gaskets,
lters and oil pipes are also suitable for bio oil.
4. Cleaning the tank
FAME acts as a solvent, removing all deposits and residues in
the tank and the oil lines. Wolf therefore always recommends
cleaning the tank before lling it with bio-oil.
5. Storing bio-oils
Bio-oil is a natural product with a lower shelf life than fuel
oil EL. Bio-oil must therefore be stored at low temperatures
(ambient temperature between 5 °C and 20 °C) and protected
from exposure to direct sunlight (in the case of plastic tanks
in particular).
Up-to-date information indicates that bio-oil should not be stored
for longer than one year, but the mineral oil industry is currently
searching for suitable additives to increase the shelf life.
Information from VDI 2035
The method of commissioning in particular can affect scaling.
Heat the system with burner stage 1 with an even and adequate
throughput.
Before commissioning, all hydraulic pipes must undergo a
tightness test:
Test pressure on heating water side max. 4 bar
Prior to testing, close the shut-off valves in the heating circuit for
the appliance, because otherwise, the safety valve (accessory)
opens at 3 bar. The appliance has already been tested at the
factory for tightness at 4.5 bar.
If the appliance is not watertight, there is a risk of leaks and
resulting material losses.
Themaximumowratemustnotexceed6000l/h(100l/min).
8. Installation - general notes

14 3062547_201507
9. Installation - accessories
We recommend making the connection to the heating system with the following parts from the Wolf accessories range.
COBconnectionsetadjacenttothewallcomprising:
2 cross pieces, each with one connection
2 clips
1 corrugated stainless steel pipe 1", length 1 300 mm
1 corrugated stainless steel pipe 1", length 800 mm
1 silicon grease tube
COBconnectionsetwithTSadjacenttothewallcomprising:
2 cross pieces, each with two connections
4 clips
3 corrugated stainless steel pipe 1", length 1 300 mm
1 corrugated stainless steel pipe 1", length 800 mm
2 corrugated stainless steel pipes ¾", length 800 mm
1 silicon grease tube
1 trimming set ¾"
COBconnection set adjacent to the wall fora freestanding
cylinderuptoSEM-1-750andSE-2-750comprising:
2 cross pieces, each with two connections
3 corrugated stainless steel pipe 1", length 1 300 mm
1 corrugated stainless steel pipe 1", length 800 mm
4 clips
1 silicon grease tube 6 at packings 1"
1 pipe bend 2 at packings 1½" EPDM
1 pump 1 adaptor tting G1½" (fem.)
2 double nipples G 1" (male) - G 1" on G1" (male)
1 elbow with air vent
TSaccessorysetforcoldwatercomprising:
1 expansion vessel 8 l
1 cold water connection pipe to the expansion vessel
2 double nipples ¾"
1 trimming set ¾"
Pipeassemblycomprising:
1 circulation pump
2 thermometers in ow and return
2 ball valves in ow and return
- Incl. / excl. mixer
- With manifold for 2 or 3 pipe assemblies
For further accessories, such as a safety assembly 1" or wall mounting bracket for pipe assembly, etc., see
"Heatingsystems"pricelist
TSDHWcirculationpumpaccessorysetcomprising:
1 analogue DHW circulation pump
1 corrugated stainless steel pipe ¾"
1 trimming set ¾"
Neutralisationbox,incl.plinthcomprising:
1 granulate ll
1 installation accessories set
(for standard fuel oil EL (sulphur content > 50 ppm),
neutralisation of the condensate is required).
Condensate lifting system with a zero-volt alarm output
comprising:
1 condensate lifting pump with a zero volt alarm output
1 condensate tank with cover and wall mounting bracket
1 PVC hose, 10 mm (6 m long)
1 non-return valve
1 condensate inlet adaptor

15
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10.Installation-boiler/TScylinder
Example: COB-15/20/29 oil condensing boiler with TS stratication cylinder on the right,
oorstanding (when looking at front of boiler). The pipework for the heating
ow and heating return, as well as the heating water ow and heating water
return, are connected to the stratication cylinder with corrugated stainless
steel pipes (accessories) (see chapter 9 "Installation - accessories").
Diagram: Cold water connection to DIN 1988
Non-return valve (individually tested) Drain
Shut-off valve
Pressure reducing valve Shut-off valve Cold water inlet Pressure gauge port DHW lter
Safety valve (individually tested)
Drain
Above top edge of the cylinder
Boiler ow
Boiler return
Note: When selecting the installation material for the system, it is important to
observe the technical rules and any possible electrochemical processes
(mixed installation).
Cold water connection We recommend the installation of a maintenance valve into the cold water supply line. A
tested and certied pressure reducer must be installed if the cold water supply pressure
is above the maximum permissible operating pressure of 10 bar.
Provide a centralised pressure reducer if mixer taps are used.
Observe the regulations of DIN 1988 as well as those of your local water supply utility
when connecting cold water and DHW. Your warranty rights may be lost if the installation
does not comply with the illustration shown.

16 3062547_201507
11. Installation examples
Pipeassemblyfortwoheatingcircuits
withmanifoldforsafetyassembly
installation
Pipeassemblyforoneheatingcircuit
forsafetyassemblyinstallation
Safety assembly for fixing to the
corrugated stainless steel pipes of
heatingowandreturn
The safety assembly and the required pipe
assembly can be installed on the left, on
the right or at the back of the boiler on a
wall or attached to the side of the boiler
casing.
Note: The pipe assembly for three heating
circuits should always be wall mounted.
Pipeassemblyforthreeheating
circuitswithmanifoldforsafety
assemblyinstallation

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12.Oilconnectioninasinglelinesystem
Assumptions:
Kinematic viscosity 6 mm²/s at 20 °C, oil temperature = 10 °C
Additional pressure drops: 4 elbows 90°, 1 non-return valve, 1 shut-off valve
In view of possible outgassing of the oil, an inlet height of more than 4 m should be
avoided.
Singlelinesystem
Secure the oil lter with the holder in the positions provided on the outside of the
boiler casing. It can also be secured on the inside of the boiler. In this case, the oil
hose can be up to 90 cm outside the casing when fed in from the top (to the back).
Oillter
Oil lines that are too large may lead to operating faults caused by trapped air.
The oil line must therefore have the smallest possible diameter.
Only materials that are suitable for oil lines should be used. In the case of copper pipes,
only metallic compression tting olives with support sleeves are permissible. They are
a reliable means of preventing air intake.
The oil lines must be installed while the system is isolated from the electrical
supply in order to avoid leaks.
With negative pressure controlled anti-lift valves, the negative pressure on the inlet side is
increased considerably. It is often difcult to adhere to the maximum permissible negative
pressure of 0.3 bar in the oil line. We therefore recommend using electromagnetically
controlled anti-lift valves.
The electrical anti-lift devices can be connected to the COB in two ways:
1. The anti-lift valve is connected at output A1. For this, output A1 must be programmed
to 9 (oil shut-off valve), see HG14.
2. If output A1 is already being used (e.g. for a DHW circulation pump), an adaptor
plug can be used. The plug (mat. no. 1718768761) is inserted between the motor of
the oil pump.
When connecting a feed pump in the supply line, the negative pressure must not exceed
0.5 bar.
Maximum line lengths
insinglelinesystems
Single line system with pump higher than tank
Oil pump,
burner
Floating air
extraction
Single line system with pump lower than tank
Floating air
extraction
Oil pump,
burner
Anti-lift valve
Notes:
Only use lter inserts made of sintered plastic with 25 - 40 μm.
The temperature must not fall below +5 °C. External tanks must have
supplementary heating facilities.
Contaminants can lead to system damage. The oil line must be ushed
prior to commissioning.
The system must be connected as a single line system. A lter/air vent valve
combination from the Wolf product range must be installed. Older two-line
systemsmustbeconvertedtosinglelinesystems.
Two-line systems lead to accelerated oil ageing and the penetration of air into
the oil. They are no longer in line with the latest technology.
In order to prevent damage to the oil pump, the fuel oil must be supplied to the
lter using a suitable manual pump.
Output Throughput
Internal
line Ø Inlet height H (m)
kg/h mm 4 3 2 1 0 -1 -2 -3
COB-15
COB-20
COB-29
to 2.5
4 77 68 58 49 40 31 22 13
6 100 100 100 100 100 100 87 64
COB-40 2.5 to 5.0 4 39 34 29 25 20 16 11 6
6 100 100 100 100 100 79 56 32

18 3062547_201507
13. Siphon/neutralisation/condensate pump
Condensate drain without neutralisation
If low sulphur fuel oil EL (sulphur content < 50 mg/kg) is used,
it may be possible to forego neutralisation of the condensate
after consultation with the lower water authority.
The condensate may be discharged into drainage pipes only in
accordance with ATV DVGW worksheet A251. Nevertheless,
neutralisation is required if a sufcient quantity of domestic
wastewater (at least 20 times the volume of the expected
amount of condensate) is not added to the condensate.
Connect the siphon supplied to the connectors on the
combustion chamber pan.
Remove the sealing plug on the siphon plug
before installing the siphon.
With a exible siphon drain hose, form a connection to the on-site
drain (condensate drain level from siphon 260 mm).
When using a condensate pump, route the exible siphon drain
hose into the condensate pump and form a connection from
there to the on-site drain.
Note: The siphon must be filled with water prior to
commissioning.
If the appliance is operated with an empty siphon,
there is a danger of poisoning caused by escaping
ue gases. For this reason, the siphon must be lled
with water prior to commissioning. Undo, remove
and ll the siphon until water runs out of the side
drain. Ret the siphon and make sure the gasket is
perfectly seated.
If condensate is directly routed to the on-site drain, ventilation
must be provided so that the drain pipe cannot affect the boiler.
NB
Condensate drain with neutralisation
For standard fuel oil EL (sulphur content > 50ppm),
neutralisationofthecondensateisrequired.
Note:Thesiphonandtheneutralisationboxmustbelled
with water prior to commissioning.
Observe the neutralisation box installation
instructions.
NB
SiphonDrain hose, siphon
SiphonCondensate pump

19
3062547_201507
14.Installationofabalanceduesystem
Diagram: Example of a C93x balanced ue system
Installationofthebalanceduesystem
Foruesandconcentricbalanceduesystems,
useonlyoriginalWolfcomponents.
Please observe the technical information
regarding balanced flue systems prior
to installing the flue or the balanced flue
connection.
As regulations in the individual Federal States
[Germany] differ, we recommend consulting the
relevant authorities and local ue gas inspector
prior to installation.
NB
Between the ue terminal and the roof surface, there must be
a distance of at least 0.4 m.
Flue connections are created using couplings and gaskets.
Always arrange couplings against the condensate flow
direction.
The balanced flue should be installed with
a slope of at least 3° (6cm/m) to the oil
condensing boiler. Spacer brackets should be
ttedtosecuretheequipmentinposition.
In the worst case scenario, a smaller slope
forthebalanceduemayleadtocorrosionor
operating faults.
Generally bevel or deburr trimmed ues to ensure
a gas tight installation of pipe joints. Ensure that
gaskets are properly tted. Remove all contamination
prior to installation - never t faulty parts.
NB
The local ue gas inspector must have clear
accesstotheuegastestnipples.
NB
InthecaseofCOB-15/20/29theenclosedue
gas measuring nipple must be mounted on the
air/uegasconnectingpieceoftheboiler.
 Alternatively, the ue gas measuring nipple
canbemountedimmediately behindthatina
horizontal position directly on the 87° elbow
ttedtotheboiler.Whendoingthis,however,
caremustbetakenthattheair/uegasductis
installedabovetheapplianceinsuchawaythat
itispossibletoremovethedisplacer(minimum
distanceaboveCOB-15/20/29is30cm;inthe
caseoftheCOB-40thisis40cm).
NB
C93x
Bei COB-15/-20/-29 muss der beiliegende
Abgas-Messstutzen auf dem Luft-/
Abgasstutzen des Kessels montiert werden.
Alternativ darf derAbgas-Messstutzen
auch unmittelbar nach dem dann direkt
auf dem Kessel aufgesteckten 87°-Bogen
waagrecht montiert werden. Hierbei ist aber
zu beachten, dass die Luft-/Abgasführung
soüberdemGerätzuverlegenist,dassein
Ausbau der Verdränger gewährleistet ist
(Mindestabstand über COB-15/-20/-29 ist
30cm;beiCOB-40istdieser40cm).
Achtung

20 3062547_201507
The displacement device may have slipped during
transport.
To ensure perfect combustion, check the
displacement device is correctly positioned before
commissioning the appliance.
- Unplug the central connector.
- Loosen the three 6 mm Allen screws on the burner ange
(do not unscrew them completely).
- Rotate the burner unit approx. 1 cm to the right
(clockwise).
- Lift the burner unit upwards out of the combustion
chamber lid and hang in place in the maintenance
position, as shown in the gure.
- Undo the wing screws on the combustion chamber lid.
- Lift off the combustion chamber lid and place to one side.
- Measure the distance between the upper edge of the top
displacement device and the upper end of the ridged prole,
then compare with the table below.
Displacement
device distance to
ridged prole (mm)
COB-15 COB-20 COB-29 COB-40
98-103 98-103 123-128 123-125
- Assembly is carried out in reverse order.
Fill the system and vent it properly to ensure
perfect boiler function.
Beforeconnectingtheboiler,ushtheheating
systemtoremoveresiduessuchaswelding
pearls,hemp,putty,etc.fromthepipework.
- Open the cap on the vent in the boiler by one revolution.
- Open all radiator valves.
- Fill the system via the return line at 2 bar (1.5 to 2.5 bar).
- With the entire heating system and boiler in a cold
condition, ll slowly via the inspection/ll & drain valve at
the return until 2 bar pressure is indicated.
- Check the entire system for water leaks.
- Start the boiler, set the heating water temperature to
position "2" (pump running, illuminated signal ring as
status indicator constantly green).
- Vent the pump; for this, briey open and then retighten the
air vent screw.
- Vent the heating circuit completely, switching the boiler
ON for 5 seconds and OFF for 5 seconds at the ON/OFF
switch, ve times in succession.
- When the system pressure drops below 1.5 bar, top up the
water.
NB
Air vent valve
Fillingtheheatingsystem
15.Fillingtheheatingsystem
Diagram: Venting the COB
Checkingthepositionofthedisplacementdevice
Diagram: View of COB displacement device
Displacement device
distance
Unplug the
central connector
Burner in the
maintenance position