Wolf CGU-2-18, CGU-2-24, CGG-2-18, CGG-2-24, CGU-2 K-18 Installation And Maintenance Instructions Manual

Part no. 30 62 347 Subject to modications

03/09 GB

Wolf GmbH · Postfach 1380 · D-84048 mainburg · Tel. [phone] · Fax [phone] · Internet: www.wolf-heiztechnik.de

Installation and
maintenance instructions

Wall mounted gas red combi boilers
and wall mounted gas red boilers

with integral cylinder connection

CGU-2-18/24
CGG-2-18/24
CGU-2 K-18/24
CGG-2 K-18/24

Illustration:

Wall mounted gas red boiler with auxiliary equipment BM

2

3062347_0309

General information

Safety instructions / Standards and regulations ............. 3-5

Installation and commissioning

Dimensions .......................................................................6

Layout / Equipment code ............................................... 7-9

Positioning information / Installation dimensions ........10-11

Installation on nished walls /

Installation on unnished walls ........................................12

General boiler installation ................................................13

Electrical connection ................................................. 14-17

Fill / Vent the system. .......................................................18

Guidelines for commissioning ..........................................19

Control / Function / Commissioning ........................... 20-21

Setting and adjusting the boiler

Displaying / Modifying control parameters ................ 22-30

DHW connection versions / Resetting control unit ...........31

Setting the eBUS address for cascade mode ..................32

Commissioning gas connection .......................................33

Conversion to other gas types / Nozzle change ..............34

Setting the control unit after converting the gas type .......35

Checking nozzle pressure .......................................... 36-37

Resetting gas valve / Setting nozzle pressure .................38

Adjusting the ue lengths CGG-2(K) ................................39

Flue gas test CGU-2(K) CGG-2(K) .................................40

Limiting the maximum output ...........................................41

Selecting the pump stage / Bypass ............................ 42-43

Checking the ue gas monitoring CGU-2(K) ....................44

Notes on planning ventilation /

Flue gas system CGU-2(K) ........................................ 45-49

Commissioning report ......................................................50

Maintenance and additional information

Inspection and maintenance steps ..................................51

Service report ...................................................................52

Maintenance .............................................................. 53-57

Wiring diagram CGU-2(K) ................................................58

Wiring diagram CGG-2(K) ................................................59

Specication ............................................................... 60-61

Fault / Cause / Remedy ...................................................62

Resistance table ..............................................................63

Notes ................................................................................64

Keyword index ........................................................... 65-67

EC declaration of conformity ............................................68

Contents

3

3062347_0309

"Safety instructions" are instructions
with which you must comply exactly, to
prevent risks and injuries to individuals
and material losses.

The following symbols and reference symbols

are used in this description. These important
instructions concern personal safety, as well as

operational reliability.

"Note" indicates technical instructions

that you must observe to prevent material
losses and boiler malfunctions.

Note

D a n g e r t h r o u g h ' l i v e ' e l e c t r i c al
components.
Please note: 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 poses a danger of injury
or death.

The main supply terminals are 'live' even
when the ON / OFF switch is in the OFF
position.

Fig.: Terminal box: Danger from electric current

Fig.: Gas connection: Escaping gas may cause poisoning
or the risk of explosion

Fig.: Ignition transformer, high voltage ignition electrode,
combustion chamber
Risk through 'live' electrical components, risk of burning
through hot components

Fig.: Gas combination valve:
Danger from electric current
Escaping gas may cause poisoning or the risk of
explosion

Balanced flue operated gas bo i l er s

must only be installed in a room that

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.

Safety instructions / Standards and regulations

4

3062347_0309

Safety instructions / Standards and regulations

Please follow these safety instructions closely to prevent accidents and material
losses.

Commissioning - Commissioning must only be carried out by the system installer or a

commissioning engineer designated by him. All actual values must be
recorded in a commissioning/service report that should be kept with these
instructions.

Safety regulations - Observe all national safety regulations and installation requirements.

- Installation, commissioning, inspection, maintenance and repairs must
only be carried out by a competent person (heating engineer / installation
contractor).

- Before working on the equipment / heating system, switch OFF the power
supply (e.g. by removing a separate mains fuse or by means of a main
electrical isolator) and safeguard against unauthorised reconnection.

- Disconnect the system by means of an appliance that isolates all non-earthed
conductors simultaneously with at least 3 mm contact separation.

- It is not permitted to carry out repairs on parts that full a safety function.

- Use only original WOLF replacement parts or those that are equivalent and
that have been approved by the manufacturer.

Instructing the
system user

- The system installer must hand the operating instructions to the system user
and instruct them in the operation of the system.

Only use propane compliant with local regulations, otherwise

faults may arise with the starting characteristics and operation

of the wall mounted gas red boiler; this in turn, may lead to
boiler damage and risk of injury.

Poorly vented LPG tanks can lead to ignition problems. In such

cases, contact your local LPG supplier.

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.
Incorrect use can lead to a risk to life and limb or to a risk of

material losses.

Obtain the permission of your gas supply utility, the ue gas inspector

and the lower water authority [where appropriate] prior to the installation

of Wolf gas red boilers.

5

3062347_0309

Safety instructions / Standards and regulations

Standards and regulations

Category: II2ELL3P<DE> and
II2H3P<AT>
NOx class: 5
Efciency: *** star rating according
to 92/42/CEE) for
balanced ue operation
Flue types: CGG-2:
C12x, C32x, C42x, C52, B32
CGU-2:
B11BS
Operating mode: open / balanced ue
To be connected to: chimney, ue chimney /
balanced ue system

- Obtain the permission of your mains gas supplier
and all relevant authorities prior to the installation of
Wolf gas red combi boilers.

- Open ue gas red boilers must only be installed
in a room that complies with the appropriate
ventilation requirements.

The gas red boiler meets with the following regulations

EC Directives

- 2006/95/EC Low Voltage Directive

- 2004/108/EC EMC Directive

- 90/396/EEC Gas user equipment

- 92/42/EEC Efciency directive

DIN / EN Standards

- EN 297; EN298; EN 483; EN 625;
EN 55014-2; EN 60335-1; EN 60335-2-102;
EN 60529; EN 61000-3-2; EN 61000-4-3

The following regulations, rules and guidelines must

be observed during installation:

- Boiler room guidelines or Building Regulations

relating to the construction and installation of
central boiler rooms and fuel storage facilities

- Technical regulations for gas and DHW installations
DVGW-TRGI 1996 and TRF 1996

(in the currently applicable form)

DIN / EN Standards

- EN 437 Test gases; test pressures;
appliance categories

- DIN EN 1283 Procedure for calculating the
standard heating load

- DIN EN 12828 Heating systems in buildings

- DIN EN 1717 Protection of DHW against
contaminations in DHW
installations

- DIN EN 50156-1 (VDE 0116 part 1)

Electrical equipment for
combustion systems

- On site regulatio ns from building and indust ry

regulatory agencies (mainly covered by the emission
test switch)

- On site regulations from the gas supply utility

6

3062347_0309

440

Dimensions

Gas red combi
boilers

Gas red boilers

1 Heating ow Heating ow

2 DHW DHW ow
3 Cold water DHW return
4 Heating return Heating return

5 Gas connection Gas connection

Installation inside a cupboard

For installation of the gas red boiler inside a cupboard
note the following:

Never install the gas red boiler on the back wall
of the cupboard, as it may not be substantial
enough to take the boiler's weight. This would
create the risk of water and gas leaks which in
turn would result in a risk of explosion
and ooding.

- Removing the rear wall of the cupboard
Minimum lateral clearance between the gas red boiler

and the cupboard sides 25 mm.

A cutout of 410 x 550 mm is required in the
cupboard top. Otherwise there is a risk of
suffocation and poisoning

With open ue gas red boilers the
ventilation grill in the cupboard door must
be installed with a free minimum diameter

of 600 cm

2

Otherwise there is a risk of suffocation
and poisoning

3

1

2

4

5

3

1

2

4

5

Min.400

Min.400

>25

694

366 CGU-2(K) 18

380 CGU-2(K) 24

258 CGG-2(K) 18/24

344

120
176

170

39

49

855

393

190

226

(CGG-2)

(CGU-2)

73

134

7

3062347_0309

Layout CGU-2(K) 18/24

Combustion

chamber

Internal lling
equipment (optional)
not <DE><AT>

Gas combination

valve

Expansion vessel

Three-way
diverter valve

Flow sensor 2

Limit thermostat

Monitoring

electrode

Ignition electrode

Heating water heat

exchanger

Safety valve

Drain valve

DHW
Flow & temperature
sensor

Flow sensor 1

Draught hood

Gas burner

Heating circuit

strainer

Cold water strainer

with throughput

limiter

Heating circuit
pump

Air vent

Bypass

Flue gas
temperature limiter

HZ - VL

HZ - RL

8

3062347_0309

Layout CGG-2(K) 18/24

Flue gas fan

with speed

regulation

Combustion

chamber

Internal lling
equipment (optional)
not <DE><AT>

Gas combination

valve

Expansion vessel

Three-way
diverter valve

Flow sensor 2

Limit thermostat

LAF connection

Monitoring

electrode

Ignition

electrode

Heating water heat

exchanger

Differential
pressure switch

Safety valve

Drain valve

DHW
Flow & temperature
sensor

Flow sensor 1

Flue gas

collector

box

Gas burner

Heating circuit

strainer

Cold water strainer

with throughput

limiter

Heating circuit
pump

Air vent

Bypass

HZ - VL

HZ - RL

9

3062347_0309

Layout / Equipment code

Heating water heat

exchanger

Gas burner

Gas

combination

valve

Expansion vessel

Air vent

Heating circuit

pump

DHW heat
exchanger

Safety valve

Drain valve

Heating circuit strainer

Cold water strainer with

throughput limiter

Limit thermostat
ow

Flow sensor 2

Flow sensor 1

Three-way
diverter valve

DHW ow
& temperature sensor
(only combi boilers)

Bypass valve

Hydro Tec system
(integrated
components)

Overow valve

Flue gas
temperature limiter

Wolf Low NOx unit with hydro tec system (plug-in technology for quick installation)

compactly designed for low emissions, high energy efciency.

DHW heat exchanger and DHW ow temperature sensor
only with combi boilers

CGU-2 - 18/24 Open ue gas red boiler with integrated cylinder connection

CGU-2 K - 18/24 Open ue gas red combi boiler

CGG-2 - 18/24 Balanced ue gas red boiler with integrated cylinder connection

CGG-2 K - 18/24 Balanced ue gas red combi boiler

Equipment codes

10

3062347_0309

Balanced ue gas red boilers must only
be installed in a room that complies with

the appropriate ventilation requirements.
Otherwise there is a risk of asphyxiation
or poisoning. Read these installation and

operating instructions before installing
the gas red boiler. Also take the technical

guide into consideration.

Sound insulation:

Under certain critical installation conditions
(e.g. installation on a drywall) additional

measures may be necessary to soundproof
the boiler. In this case use soundproof
plugs and, if necessary, rubber buffers or

insulation strips.

Positioning information /
Installation dimensions

l.h. turnbuckle

r.h. turnbuckle

Fig.: Opening the turnbuckle

- Determine the installation location for the gas red
boiler; maintain the specied minimum clearances
(see dimensions).

- Fit the supplied installation template (paper poster) to
the wall.

- Transfer the xing hole and connection positions
marked on the installation template to the wall (e.g.
with a power drill).

- Remove the installation template.

- Drill Ø 12 mm holes for the mounting bracket and
secure the bracket using the rawl plugs and screws
supplied. (Before securing the bracket, check that the
rawl plugs are suitable for the wall construction.)

- Remove the casing lid of the gas red boiler. For this,
pivot the control unit lid down, hook in the r.h. and
l.h. turnbuckle, undo the bottom of the casing lid and
unhook at the top.

- Hang the gas red boiler with the hook-in brace on the
back of the boiler onto the mounting bracket.

General

The gas red boiler may only be installed in rooms that
are protected from frost.

During the boiler installation ensure that all
xings are sufciently strong to carry its weight.
Also consider the wall consistency, otherwise
gas or water may escape which could lead to
explosions and ooding. It can also lead to
noise developing.

During the boiler installation, ensure that

no contaminants (e.g. drilling swarf) enter

the gas red boiler otherwise faults may

develop.

The combustion air supplied to the boiler must
be free from chemicals, e.g. uoride, chlorine
or sulphur. Such materials are contained in
sprays, solvents and cleaning agents. Under
the most unfavourable conditions, these
may lead to corrosion, even in the ue gas
system.

Note

500

25 25

(CGU-2-18) Ø110

(CGU-2-24) Ø130

(CGU-2) min.400

(CGG-2)

min.200

(CGG-2-18)
Ø100

1212

344

min.200

1478

11

3062347_0309

Positioning information /
Installation dimensions

270-420

790

694

1754-1904

810

5

=

=

100

547

Installation dimensions of the boiler with freestanding cylinder SW-120 / CSW-120
Installation on unnished walls

Installation dimensions of the boiler with freestanding cylinder SW-120 / CSW-120
Installation on nished walls

12

3062347_0309

Installation on nished / unnished walls

Fig.: View from below, connection set for installation on
nished walls

Installation on unnished walls (accessory)

Fig.: Front view, connection set for installation on unnished walls

Fig.: View from below, connection set for installation on
unnished walls

Installation on nished walls (accessory)

Fig.: Front view, connection set for installation on nished walls

 Heating ow Rp ¾"
 DHW Rp ¾" (gas combi boilers)
 Cold water Rp ¾" (gas combi boilers)
 Heating return Rp ¾"
 Gas connection Rp ½"
Drain for safety valve R 1"

With boilers that are not used for DHW, seal the cold and DHW connections with locking
cap G ¾" (accessory).
If this is not done then the building and equipment may be damaged through uncontrolled
water leakages.

 Heating ow R ¾"
 DHW R ¾" (gas combi boilers)
 Cold water R ¾" (gas combi boilers)
 Heating return R ¾"
 Gas connection R ¾"
Drain for safety valve R 1"



164

94

84











120

176



164

64

55











120

200

7

190

107

73

55

134

13

3062347_0309

General boiler installation

Gas connection

Laying the gas pipe, as well as making the
gas connections, must only be carried out by
a licensed gas  tter. Close the gas ball valve
on the gas  red combi boiler to pressure test
the gas pipe.
Remove all residues from the heating pipework
and the gas pipe prior to connecting the gas
 red boiler, particularly in older systems.
Prior to commissioning, test all pipe and gas
connections for leaks.
Inappropriate installation or using unsuitable
components or assemblies may lead to gas
escaping, which results in a risk of poisoning
and explosion.

The gas valve can be subj ecte d to a
maximum pressure of 150 mbar. Higher

pressure may dam age the gas valve,
resulting in a risk of explosion, asphyxiation

or poisoning. Close the gas ball valve on
the gas  red boiler to pressure test the

gas pipe.

Install a tested and certified pressure
reducer, if the cold water supply pressure is

above the maximum permissible operating
pressure of 10 bar. Otherwise water could
escape resulting in a risk of  ooding.

Fig.: Cold water connection

Cold water and DHW connection

For the cold water and DHW connection, we recommend
installation in accordance with the diagram below.

- Wolf connection sets (accessories) are available for
installation on  nished and un nished walls. The
connection pipes are Cu 18x1.

Hydraulic connections

Note:

As standard, a combined cold water strainer

with throughput controller  is  tted at the cold
water connection  of the boiler (see Fig.).





Fig.: Throughput controller with cold water strainer

Installation inside a cupboard

For installation of the gas  red boiler inside a
cupboard note the following:

Never install the gas  red boiler on the back wall
of the cupboard, as it may not be substantial
enough to take the boiler's weight. This would
create the risk of water and gas leaks which
in turn would result in a risk of explosion and
 ooding.

Removing the rear wall of the cupboard
Minimum lateral clearance between the gas

 red boiler and the cupboard sides 25 mm.

A cutout of 410 x 550 mm is required in the
cupboard top. Otherwise there is a risk of
suffocation and poisoning

With open  ue gas  red boilers the
ventilation grille in the cupboard door must
be installed with a free minimum diameter of

600 cm2.

Otherwise there is a risk of suffocation and
poisoning.

As the cold water strainer may need
to be cleaned, provide a facility for its

removal in site.

Otherwise there is a risk of faults.

Drain

Drain

Shut-off valve

Pressure

reducing valve

Shut-off valve

Cold water inlet

Pressure gauge port

DHW  lter

Safety valve

Note

14

3062347_0309

Electrical connection
CGU-2(K) / CGG-2(K)

General notes

The installation must be carried out by a
licensed electrical contractor. Observe

the regulations of the relevant authorities
and the local regulations of the power
supply company.

The power supply terminals are 'live'

even when the ON/OFF switch has been

switched OFF.

Terminal box

Terminal box

The control, regulating and safety equipment are fully
wired and tested.
You only need to connect the power supply and the
external accessories.

Power supply connection

Connect the power supply permanently or with a safety
plug (no plug connection in protective areas 1 and 2, i.e.
near a bath or shower).

Provide the power supply via a mains isolator (e.g. fuse,
heating system emergency stop), which ensures at least
3 mm contact separation for all poles.
Connection cable exible, 3 x 1.0 mm² or rigid,
max. 3 x 1.5 mm².
The plug must be accessible when using a power supply
cable with safety plug. Flexible power supply cable
3 x 1.0 mm².

15

3062347_0309

Flue gas damper connection (230 V; max.200 VA)

Insert the cable glands into the terminal box. Insert
and secure the connecting cable through the cable
gland. Connect the connecting cable to terminals L1, N,

and .

Fig.: Flue gas damper connection

Changing a fuse

Isolate the boiler from the main supply prior

to changing a fuse. The ON/OFF switch on

the boiler does not provide separation from

the power supply.

Danger through 'live' electrical components.

Never touch electrical components or

contacts if the boiler has not been isolated

from the power supply. Danger of death.

Fig.: Pivot the control unit forward, terminal box
cover open

Fuse

Electrical connection CGU-2(K)

Connection to Output A1 (230 VAC; max.200 VA)

Insert the cable glands into the terminal box. Insert
and secure the connecting cable through the cable
gland. Connect the connecting cable to terminals L1,
N and .

Fig.: Connection output A1

Installation information, electrical connection

- Isolate the system from the power supply before
opening the casing.

- Pivot the control unit to the side.

- Open the terminal box.

- Insert the strain relief into the holes provided.

- Strip approx. 70 mm off the power supply cable
insulation.

- Push the cable through the strain relief and
secure the strain relief.

- Pull the Rast-5 plug.

- Terminate the appropriate cores at the Rast-5 plug.

- Push the inserts back into the terminal box casing.

- Push the Rast-5 plugs back into the correct
positions.

A

Mains connection 230 VAC/50 Hz

C

Programmable output A1

G

Flue gas damper connection

D

Programmable input E1 zero volt

E

2-wire eBUS connection, digital Wolf control
accessories

F

Outside temperature sensor

A C G D E F

.



230 V < 24 V

230 V < 24 V

16

3062347_0309

Electrical connection CGU-2(K)

Fig.: Connection DHW circulation pump / external
accessories

Changing a fuse

Isolate the boiler from the main supply prior

to changing a fuse. The ON/OFF switch on

the boiler does not provide separation from

the power supply.

Danger through 'live' electrical components.

Never touch electrical components or

contacts if the boiler has not been isolated

from the power supply. Danger of death.

Fig.: Pivot the control unit forward, terminal box

cover open

Fuse

Connection to Output A1 (230 VAC; max. 200 VA)

Insert the cable glands into the terminal box. Insert
and secure the connecting cable through the cable
gland. Connect the connecting cable to terminals L1,
N and .

Fig.: Connection output A1

Installation information, electrical connection

- Isolate the system from the power supply before
opening the casing.

- Pivot the control unit to the side.

- Open the terminal box.

- Insert the strain relief into the holes provided.

- Strip approx. 70 mm off the power supply cable
insulation.

- Push the cable through the strain relief and
secure the strain relief.

- Pull the Rast-5 plug.

- Terminate the appropriate cores at the Rast-5 plug.

- Push the inserts back into the terminal box casing.

- Push the Rast-5 plugs back into the correct
positions.

Power supply for external accessories

(230 VAC; max. 200 VA)

Insert the cable glands into the terminal box. Insert and
secure the connecting cable through the cable gland.
Connect the connecting cable to terminals L1, N and .

Netz

Z

A1

N

N

N

L1

L1

L1

L1

L1

L1

N

N

N

3

Z

A1

N

N

NL1

L1

L1

L1 L1

L1

NN

N

3

Netz

A

Mains connection 230 VAC/50 Hz

B

Power supply, ext. Accessories
230 VAC/50 Hz/max. 200 VA

C

Programmable output A1

D

programmable input E1 zero volt

E

2-wire eBUS
connection, digital Wolf control accessories

F

Outside temperature sensor

A B C D E F

230 V < 24 V

230 V < 24 V

17

3062347_0309

Connection, analogue outside temperature sensor

The analogue outside temperature sensor for digital
control accessory (e.g. BM) may be connected to the
terminal strip of the gas red boiler at the connection AF
or the terminal strip of the BM.

Fig.: Connection, analogue outside temperature sensor

Connection of digital Wolf control accessories
(e.g. BM, MM, SM1, SM2, KM)

Only connect control units from the Wolf accessory
range. Eac h accessory is supplied with its own
connection diagram.
Use a 2-core cable (cross-section > 0.5 mm²) as the
connecting cable between the control unit accessory
and the gas red boiler.

Fig.: Digital Wolf control accessories connection (eBUS
interface)

Electrical connection
CGU-2(K) CGG-2(K)

Fig.: Connection, programmable input

Connection, programmable input E1 (<24 V)

Connect the connecting cable for input 1 at terminals E1
in accordance with the wiring diagram; rst remove the
jumper between a and b from the respective terminals.

The functions of input E1 can only be scanned and
adjusted with Wolf control accessories with eBUS
capability.

DHW tank sensor connection

- When a cylinder is to be connected, the blue socket
of the cylinder sensor must be connected to the blue
plug of the control unit.

- Observe the cylinder installation instructions.

Fig.: Blue plug, cylinder sensor connection

Blue plug

Note

Pay attention
+ , ­to polarity

18

3062347_0309

Fill / vent the system

Procedure for boilers with
internal lling facility

not for <DE> <AT>

- Fill the entire heating system and boiler via the lling facility or an on-site

ll & drain valve up to approx. 0.5 - 1 bar, whilst simultaneously venting the

heating system.

- Close the shut-off valves on the heating water side of the boiler (ow and
return).

- Push the drain hose onto the drain valve of the hydraulic assembly.

- Clean the heat exchanger by opening the internal lling facility and the

drain valve simultaneously on the hydraulic assembly (make sure there is

no air remaining in the heat exchanger).

Procedure for boilers without
internal lling facility

Filling the system

Fill the system and vent it thoroughly to safeguard the perfect

function of the gas red boiler.

Otherwise there is a risk of faults.

The heating water must not be mixed with inhibitors or antifreeze;
otherwise leaks and ooding could result.

- Close the gas ball valve.

- Before connecting the gas red boiler to the heating system, ush the entire

system to remove residues such as welding pearls, hemp, putty, etc. from
the pipework and to remove air that may have collected.

- Fill the DHW system of the boiler until water ows out of a DHW draw-off point.

- To ll the heating system use the ll & drain connections. Open the cap of the
automatic air vent valve on the heating circuit pump by approx. 2 revolutions, but
do not remove the cap.

- Open all radiator valves and the shut-off valves on the heating water side of the

boiler.

- Fill the entire heating system and boiler via the ll & drain valves (Wolf
accessory) up to approx. 0.5 bar, whilst simultaneously venting the heating

system.

- Close the return shut-off valve on the heating water side of the boiler.

- Attach drain hose to the drain valve on the hydraulic assembly (alternative, if only
a ll & drain connection is provided).

- Clean the heat exchanger by opening the ll & drain valve and/or the

drain valve simultaneously on the hydraulic assembly
(make sure there is no air remaining in the heat exchanger).

- Remove the drain hose and open the boiler shut-off valve(s) on the heating water
side again.

- After venting, raise the system pressure to 2.5 bar.

- Start the boiler, set the heating water temperature selector to position "2"
(pump running, illuminated signal ring (status display) constantly green).

- Vent the pump; for this, briey open and then retighten the air vent

screw, optimum venting in pump stage 3.

Top up with water when the system pressure falls severely.

- Open the gas shut-off valve. Press the reset button.

- When in constant use the heating circuit vents automatically via the heating
circuit pump, venting optimum at pump stage 3. After venting set to pump
stage 1 or 2 for reduced noise, depending on customer preference.

- At system pressure below 1.0 bar the boiler may experience faults.
If necessary ll on heating side.

Internal lling
facility not for

<DE><AT>

Drain
valve

Fig.: Shut off valves (accessory)

Gas shut-off valve

Heating ow
(incl. ll & drain
connection)

Heating return
(incl. ll & drain
connection)

Automatic

air-vent valve

Fill & drain

Connection

Note

19

3062347_0309

- Instruct the customer about energy-saving options.Saving energy

Commissioning guidelines

Only qualied personnel must carry out the commissioning and initial
start-up of the boiler as well as instruct the user.

Guidelines for commissioning

- Flush and vent boiler (use shut-off valve with ll & drain valve from Wolf

accessory range), ll boiler and system and test for tightness. Normal
operating pressure when system is cold 1.5 bar. Prevent water leaks.

- Check location and seating of the installation.

- Check the gas supply pressure.

- Check all connections and component links for leaks.

- If tightness cannot be ensured then there is a danger of water damage.

- Check that all ue gas accessories have been correctly installed.

- Open the water and shut-off valves on ow and return.

- Open gas connection.

- Switch ON emergency heating switch and switch ON the ON/OFF switch on

the control unit.

- Check the adjustment of the ue length, resetting if required.

See chapter "Adjusting the ue length".

- Check the ignition and ame structure of the burner.

- The illuminated ring shows a yellow colour, if the boiler starts correctly.

- Instruct the customer in the operation of the boiler, with the aid of the

installation instructions.

- Complete the commissioning report and hand over the instructions to the

customer.

- Implement the "Installation" and "Electrical connection" of the boiler

and all extension and programming modules in accordance with the
instructions in the associated manuals.

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Step 9

Step 10

Step 11

Step 12

Step 13

Step 14

Step 15

Note

Otherwise there is a risk of faults.

e
e

e
e

e
e

e
e

e
e
e

e
e
e
e

20

3062347_0309

Control / Function / Commissioning

ON / OFF switch

DHW

temperature

selector

Pressure

gauge

Reset

button

Heating water

temperature

selector

Illuminated

signal ring

Thermometer

9

1

2

8

3

7

4

6

5

DHW temperature selector

Settings 1-9 correspond with a DHW temperature of 40-65 °C with gas combi
boilers, or 15-65 °C with gas boilers with a cylinder. Combined with a control
thermostat for wall mounted gas  red boilers, the adjustment at the DHW
temperature selector is disabled; instead the temperature is selected at the
boiler control thermostat.

2

8

3

7

4

6

5

Heating water temperature selector

Settings 2-8 correspond to a heating water temperature of 40-80 °C. Combined
with a temperature controller for wall mounted gas  red boilers, the adjustment
at the heating water thermostat is disabled; instead the temperature is selected
at the boiler temperature controller.

Signal ring as
status display

Display Explanation

Flashing green Standby (power supply ON, burner OFF)

Constant green light Heat demand: pump running, burner OFF

Flashing yellow Emissions test mode

Constant yellow light

Burner ON,  ame steady

Flashing red

Fault

Reset

A fault is reset by pressing the reset button which will also restart the system.
Pressing the reset button reactivates the system, if there was no fault.

21

3062347_0309

In conjunction with the accessory controllers BM / AWT / ART, the settings at
the boiler relating to DHW and heating water are disabled.

Note:

Setting

Winter mode (position 2 to 8)

In winter mode, the boiler heats to the temperature selected at the heating water
temperature controller. According to the pump operating mode, the circulation
pump operates constantly (factory setting) or only in parallel with the burner
activation / run-on period.

Summer mode

The winter mode is deactivated by rotating the heating water temperature
selector into position . In other words, the boiler will then operate in summer
mode. Summer mode (heating OFF) means, only DHW heating. Frost protection
for the heating system and pump anti-seizing protection, however, remain

enabled.

In summer mode, the circulation pump operates for approx. 30 seconds after
a maximum idle period of 24 hours.

Anti-seizing pump protection

Thermomanometer

The current heating water temperature is displayed in the upper area.
The water pressure in the heating system is displayed in the lower area. In
normal use, the water pressure should be between 2.0-2.5 bar.

Emissions test mode

The emissions test mode is activated by rotating the heating water temperature
selector into position . The signal ring  ashes yellow. After the emissions
test mode has been activated, the boiler will heat with the selected maximum
heating output. Any previous cycle block will be cancelled. The emissions test
mode terminates after 15 minutes or when the maximum  ow temperature has
been exceeded. For a renewed activation, turn the heating water temperature
selector anti-clockwise and then back into position .

Control / Function / Commissioning

22

3062347_0309

Parameter overview / setting report

Column 1 settings apply to control accessories ART, AWT

Column 2 settings apply to Wolf control system with BM programming module

(Setting and function of the most important functions on the following pages, further description,
see BM installation instructions.)

Parameters Setting range

Factory setting

Individual settings

Column 1 Column 2

HG00 Adjusting ue lengths 1 to 5 4

GB05 A09 Frost protection limit -20 to +10 °C +2 °C

GB01 HG01 Burner switching differential 5 to 25 K 8 K

HG02 Lower burner output heating 1 to 100% 1%

HG03 Upper burner output DHW 1 to 100% 100%

GB04 HG04 Upper burner output heating 1 to 100% 100%

GB06 HG06 Pump operating mode 0 to 2 0

GB07 HG07 Boiler circuit pump run-on time 0 to 30 min 1 min

GB08 HG08 Maximum boiler temperature, heating 40 to 90 °C 80 °C

GB09 HG09 Burner cycle block 1 to 30 min 7 min

HG10 eBUS address (display only) 1 to 4 1

HG11 DHW quick start temperature 10 to 60 °C 10 °C

HG12 Gas type, 1=natural gas 0=LPG 0 to 1 1

HG13 Programmable input E1 1 to 11 1

HG14 Programmable output A1 0 to 15 6

HG15 Cylinder hysteresis 1 to 30 K 5 K

HG20 Max. cylinder heating time 0 to 5 h 2 h

HG21

Minimum boiler water temperature TK-min >40 °C*

20 to 60 °C 40 °C

HG23 Maximum DHW temperature 60 to 80 °C 65 °C

HG25

Boiler overtemperature during DHW cylinder heating

0 to 40 K 20 K

HG70

Manifold sensor (display only)

HG80-89 Fault history

The control parameters can only be modied or displayed via Wolf control accessories with eBUS
capability. For installation and procedures, check the operating instructions of the relevant accessories.

To prevent damage to the heating

system, cancel night setback when
outside temperatures fall below -12 °C. If
this rule is not observed, ice may form on
the ue outlet which may cause injury to

individuals or material losses.

Modications must only be carried out by
a recognised heating contractor or by the

Wolf customer service.

L.h. rotary selector
Program selection

Display R.h. rotary selector

Temperature selection

Info key Single cylinder

heating key

Setback keyHeating key

Note

BM programming module

Displaying / modifying control parameters
with Wolf control accessories

* To prevent damage to the boiler TK min must be set > 40 °C

23

3062347_0309

Press the r.h. rotary selector to change to control level 2. Turn the r.h. rotary
selector clockwise to select the menu level Contractor and con rm the selection
by pressing the r.h. rotary selector again.
The display shows the code scan.

Contractor level

expert

The correct code is set by pressing (display indication  ashes) and then
turning the r.h. rotary selector from 0 to 1. After changing the code from 0 to
1, pressing the r.h. rotary selector again con rms the setting; you are then at
the Contractor level.

Code scan

code-NO

- - - -

Factory setting: 1

The boiler circuit pump operates constantly if the outside temperature stays
below the selected value. The burner starts and heats the boiler to at least
TK-min., if the boiler water temperature falls below +5 °C.

Note:

Only change the factory setting if you can ensure that the heating system and
its components will not freeze up at low outside temperatures.

Frost protection limit

Parameter A09

A09

2.0

Factory setting: 2 °C
Setting range: -20 to +10 °C

Note

Incorrect operation can lead to system faults.
Please note when adjusting parameter A09 (frost protection / outside
temperature), that frost protection is no longer safeguarded if you set
temperatures lower than 0 °C. This can lead to heating system damage.

Displaying / modifying control parameters
with Wolf control accessories

The control parameter should be
set according to the table opposite,
subject to the calculated length of the
balanced  ue routing. The calculated
length will be rounded up or down
accordingly.

(Also see chapter "Adjusting the  ue
length".)

Matching the pipe length

Parameter HG00

HG00

4

Factory setting: 4
Setting range: 1 to 5

HG00

Adjusting

pipe lengths

Calculated length (m)

1 1.3 - 1.5

2 1.5 - 2.5

3 2.5 - 3.5

4

(factory setting)

3.5 - 4.0

5 4.0 - 5.0

The burner switching differential regulates the burner temperature within a set
range by switching the burner ON and OFF.
The higher the ON / OFF temperature differential, the higher the boiler
temperature  uctuation around the set temperature.

Burner switching differential

Parameter HG01

HG01

8

Factory setting: 8 K
Setting range: 5 to 25 K

The lower burner output in heating mode can be adjusted within the modulation
range. The setting relates to the maximum heating output in kW (see table
"Limiting maximum heating output").

Lower burner output Hz
Parameter HG02

HG02

1

Factory setting: 1
Setting range: 1 to 100

24

3062347_0309

J

J

J

Displaying / modifying control parameters
with Wolf control accessories

The higher burner output in DHW mode can be adjusted within the modulation
range. The setting relates to the maximum heating output in kW (see table
"Limiting maximum heating output").

Upper burner output DHW
Parameter HG03

HG03

100

Factory setting: 100
Setting range: 1 to 100

The higher burner output in heating mode can be adjusted within the modulation
range. The setting relates to the maximum heating output in kW (see table
"Limiting maximum heating output").

Upper burner output Hz
Parameter HG04

HG04

100

Factory setting: 100
Setting range: 1 to 100

Pump operating mode 0:

Heating circuit pump for heating systems without cascade control and
without low loss header

The boiler pump runs constantly when there is a heat demand. When the heat
has been switched off via the room thermostat or remote control, the boiler
pump runs for the set time (pump run-on Hz, parameter HG07).

Pump operating mode

Parameter HG06

HG06

0

Factory setting: 0
Setting range: 0 / 1 / 2

Pump operating mode 1:
Feed pump for heating systems with cascade control and/or low loss

header/buffer (manifold sensor essential)

Boiler pump becomes the feed pump.
The manifold sensor affects the heating operation as well as the cylinder heating
(please note: only cylinder mode possible). The boiler pump will not run for a
general heat demand, but rather only when there is a burner demand in the
heating operation, with pump run-on according to parameter HG07.

VL Sensor 1

Three-way valve

Header

Manifold sensor E1

VL Sensor 2

A1 as heating
circuit pump

A1 as primary
cylinder pump

DHW cylinder

Hydraulic scheme:

Gas  red boiler

Boiler
pump

or

25

3062347_0309

Subject to there being no heat demand from the heating circuits, the boiler
circuit pump will run-on in accordance with the set time, to prevent a boiler
safety shutdown at high temperatures.

Boiler circuit pump run-on time

Parameter HG07

HG07

1

Factory setting: 1 min
Setting range: 0 to 30 min

Displaying / modifying control parameters
with Wolf control accessories

J

J

J

J

Hydraulic scheme:

VL Sensor 2

VL Sensor 1

Three-way valve

Manifold
sensor E1

A1 as heating
circuit pump

Cylinder
sensor

Buffer

DHW cylinder

Gas  red boiler

Boiler
pump

Pump operating mode 2:
Buffer cylinder primary pump

Boiler pump becomes the buffer primary pump.
The manifold sensor (buffer) only affects the heating operation. In case of DHW
heating, the reference temperature is provided by the internal boiler sensor.
The boiler pump will not run for a general heat demand, but rather only when
there is a burner demand in the heating operation, with pump run-on according
to pump run-on time.
With DHW demand (free standing cylinder, combi boiler, strati cation cylinder)
the heating circuit pump runs according to function.
Operation without manifold sensor:
Boiler pump only during burner operation; regulated by internal sensor.

This function limits the boiler water temperature upwards in heating mode, and
the burner shuts down. This parameter has no function during cylinder heating,
and the boiler water temperature may also be higher during this time. "Reheating
effects" can result in the temperature being exceeded a little.

Maximum limit

Boiler circuit TV-max.
Parameter HG08

HG08

80

Factory setting: 80 °C
Setting range: 40 to 90 °C

26

3062347_0309

The eBUS address can only be displayed here. The setting is done as described
in "Conversion/eBUS address in cascade operation" and is only required in
cascade operation with several boilers.

eBUS address

Parameter HG10

HG10

1

Factory setting: 1
Setting range: 1 to 4

Gas type set according to the following table:
1 = Natural gas
0 = LPG

The modulating current for the gas combi valve is adjusted to  t with the
relevant setting.
The conversion of the gas type can also be carried out through the selector or the
heating temperature selector (see control settings after gas type conversion).

Gas type
Parameter HG12

HG12

1

Factory setting: 1
Setting range: 0 to 1

Outside of the DHW switching times (in the control accessories) and in summer
mode, water can be heated to and kept at a certain temperature in the  at-plate
heat exchanger.
10 °C = DHW quick start disabled
40-60 °C = DHW quick start enabled

DHW Quick Start
Parameter HG11

HG11

10

Factory setting: 10 K
Setting range: 40 to 60 K

Displaying / modifying control parameters
with Wolf control accessories

Each time the burner is shut down in heating mode, it will be blocked for the
duration of the burner cycle block.
The burner cycle block is reset by switching the ON / OFF switch OFF and ON
or by brie y pressing the reset button.

Burner cycle block
Parameter HG09

HG09

7

Factory setting: 7 min
Setting range: 1 to 30 min

27

3062347_0309

Explanation

1

Room thermostat

Closed contact is a pre-requisite to enable the burner in heating mode.
No function (blocked) for DHW mode. No function (blocked) for emissions test mode and frost protection, no error message.
Open contact blocks the enabling of the heating and the boiler pump (pump run-on time)

2

Maximum thermostat / system pressure switch

Closed contact is a prerequisite for enabling burner in central heating, DHW and emissions test mode. When the
contact is opened the boiler switches off and the pump run-on begins.
A fault message is generated.

5

Ventilation damper

Function monitoring of the ventilation damper with zero volt contact
Closed contact is a prerequisite for enabling burner in central heating, DHW and emissions test mode
Output A1 must be programmed to 7, ventilation damper function

6

DHW circulation pushbutton

After the DHW circulation pushbutton is activated, output A1 is switched on for 5 minutes, if output A1 is programmed as
DHW circulation pump (A1 = 13)

7

Manifold sensor

A manifold sensor (5 K-NTC) is connected at E1. The  ow temperature control in heating and DHW mode (pump
operating mode 1) or only in heating mode (pump operating mode 2) no longer relates to the  ow sensor but rather the
manifold sensor. Safety functions and emissions test mode remain at the  ow sensors. In case of break or short circuit
of the manifold sensor, the  ow sensor takes on the temperature control. Observe parameter HG 06

8

Burner block (BOB)

Operation without burner
Closed contact, burner blocked
Heating circuit pump and cylinder primary pump run in normal operation
In emissions test mode and frost protection the burner is enabled
Open contact enables the burner again

10

External burner demand

Closed contact, set FT is set to TKmax  ow hysteresis
Demand also functions in standby; cycle block active
(Control of output A1 when parameter output A1 = 14)

0, 3, 4, 9, 11 are without function

The functions of input E1 can only be scanned and adjusted with Wolf control
accessories with eBUS capability.

The following functions can be allocated to input E1:

Programmable
Input E1
Parameter HG13

HG13

1

Factory setting: 1
Setting range: 1 to 10

Displaying / modifying control parameters
with Wolf control accessories

The electrical control to input E1 must be made with a zero volt contact. Otherwise,
use an on-site relay for potential separation.

28

3062347_0309

Explanation

0 No function

Output A1 is not enabled

1 DHW circulation pump 100%

Output A1 is switched by control accessories (BM), if DHW circulation has been enabled. Output A1 is constantly
enabled when no accessory controller is installed.

2 DHW circulation pump 50%

Output A1 is switched by control accessories (BM), if DHW circulation has been enabled. 5 minutes ON and 5
minutes OFF. Output A1 constantly cycled in 5 minute cycles when no accessory controller is installed.

3 DHW circulation pump 20%

Output A1 is switched by control accessories (BM), if DHW circulation has been enabled. 2 minutes ON and 8
minutes OFF. Output A1 cycles constantly when no accessory controller is installed.

4 Alarm output

Output A1 is controlled after a fault and expiry of 4 minutes.

5 Flame detector

Output A1 is controlled after a  ame has been recognised.

6 Cylinder primary pump

Output A1 always closes along with the boiler pump in DHW operation. Both with 3-way valve idle period protection
and with pump kick.

7 Ventilation damper

Output A1 is activated before each burner start. The burner will, however, only be enabled after input E1 has been
closed.

Important: In any case, input E1 must also be programmed as "Ventilation damper"!

Otherwise there is a risk of faults.

The feedback to input E1 must be made with a zero volt contact. Otherwise, use an on-site relay for potential
separation.

8 External ventilation

Output A1 is controlled inverted to the burner. Switching OFF external ventilation (e.g. extractor fan) during burner
operation is only required, if the boiler is operated as open  ue system.

9 External LPG valve

Output A1 switches with the gas combi valve

10 Direct heating circuit pump

Pump switches in accordance with the enabling of the direct heating circuit

11 External pump

Output A1 switches synchronously with the heating circuit pump (HKP). Use with, for example, system separation.

12 Diverter valve

If E1 is programmed for burner blocking (option 8) and closed, A1 switches ON. If E1 is not programmed as burner
blocking, A1 always stays OFF.

13 DHW circulation pump

DHW circulation pump ON for 5 mins, if input E1 is programmed as DHW circulation pushbutton and input E1 Key is
closed.

14 Pump with external burner demand

Synchronous control with input E1 (E1 = 10, ext. burner demand)

15 Constant voltage for accessories

A1 is always closed (constant voltage 230 VAC)

The functions of output A1 can only be scanned and adjusted with Wolf control
accessories with eBUS capability.

The following functions can be allocated to output A1:

Programmable
Output A1

Parameter HG14

HG14

6

Factory setting: 6
Setting range: 0 to 15

Displaying / modifying control parameters
with Wolf control accessories

Note

230 V AC

< 24 V

29

3062347_0309

The cylinder hysteresis regulates the start point for cylinder heating. The greater
the hysteresis, the lower the start temperature.
Example: Set cylinder temperature 60 °C
Cylinder hysteresis 5 K

Cylinder heating commences at 55 °C and ends at 60 °C.

Cylinder hysteresis
Parameter HG15

HG15

5

Factory setting: 5 K
Setting range: 1 to 30 K

Cylinder heating commences as soon as the cylinder temperature sensor
demands heat. The heating circuit pump would be constantly switched OFF, if
the boiler was undersized, the cylinder was scaled-up or if DHW was constantly
drawn. The accommodation cools down signi cantly. One option enables a max.
cylinder heating time to be speci ed to limit this effect. The control unit reverts
to heating mode, when the set cylinder heating time has expired and cycles in
the selected rhythm between heating and cylinder heating mode, irrespective
of whether the cylinder has reached its set temperature or not.
Set this parameter to 0 in heating systems with a high DHW consumption, e.g.
hotels, sports facilities etc.

Max. cylinder heating time

Parameter HG20

Factory setting: 2 h
Setting range: 0 to 5 h

HG20

2

The control unit is equipped with an electronic boiler thermostat, with an
adjustable minimum switch-ON temperature. The burner is switched ON subject
to the cycle block if this temperature is not achieved when heat is demanded.
The minimum boiler water temperature TK-min. is also not necessarily achieved
when there is no heat demand.

Minimum boiler water temperature
TK-min.
Parameter HG21

HG21

40

Factory setting: 40 °C
Setting range: 20 to 60 °C

Displaying / modifying control parameters
with Wolf control accessories

This temperature can be enabled at 80 °C, if for commercial reasons a higher
DHW temperature is required.
If pasteurisation (BM) has been enabled, the DHW cylinder will be heated to
65 °C during the  rst cylinder heating of the day, subject to parameter HG23
being set to this temperature or higher.

Take adequate measures to prevent scalding.

Maximum DHW temperature
Parameter HG23

HG23

65

Factory setting: 65 °C
Setting range: 60 to 80 °C

Note

30

3062347_0309

The excess temperature differential between the cylinder temperature and the
boiler water temperature during cylinder heating is selected with parameter
HG25. This ensures that, even in spring and autumn, the boiler water
temperature is higher than the cylinder temperature, thereby ensuring short
heating times.

Boiler overtemperature during
DHW cylinder heating
Parameter HG25

HG25

20

Factory setting: 20 K
Setting range: 0 to 40 K

Displaying / modifying control parameters
with Wolf control accessories

Parameters

HG 80

Fault 1

HG 81

Fault 2

HG 82

Fault 3

HG 83

Fault 4

HG 84

Fault 5

HG 85

Fault 6

HG 86

Fault 7

HG 87

Fault 8

HG 88

Fault 9

HG 89

Fault 10

HG70

54

Display only:

With parameter HG70 analogue input E1 is displayed, if a manifold sensor is
connected (display only).

HG80

04

Display only:

Fault history

Parameter HG80

31

3062347_0309

Reset

Observe the following steps to implement a reset:

- The operating mode switch must be set to O (OFF).

- Press the reset button on the control unit and hold it down.

- Switch on ON/OFF switch in I position.

- After 5 seconds the signal ring will illuminate and ash yellow/green and
red every 1 second.

- Then release the reset button again.

All parameters (individual settings) are returned to their factory

settings by a reset, except for gas type settings and adjustments
to pipe lengths.

ON / OFF switch

Press reset button

With boilers CGU-2 / CGG-2 there are 3 possible boiler versions.

The DHW circuit is bridged and is not used

When drawing DHW the ow rate sensor
recognises the DHW demand. The burner is
red-up and regulated to the set DHW outlet
temperature (adjusted via rotary selector or
control accessories)

When drawing DHW, the temperature
falls below the set DHW temperature. The
burner res up and regulates the boiler ow
temperature and boiler excess temperature
when preparing DHW

DHW connection versions /
Resetting control unit

Boiler

Combination
boiler

Boiler with cylinder

A VL sensor 2

B VL sensor 1

C Boiler pump

D Three-way valve

E Flow rate sensor

F Cylinder sensor

Legend

Note

A

B

C

D

A

B

C

D

E

F

A

B

C

D

32

3062347_0309

Boiler in cascade

operation

eBUS address

Position

Rotary

selector, DHW

temperature

selection

Illuminated ring

display

1 (factory setting) 1 1 ashing red

2 2 2 ashing yellow

3 3 3 ashing yellow/red

4 4 4 ashing yellow/green

ON / OFF switch

DHW temperature

selector

Pressure

gauge

Reset

button

Heating water

temperature

selector

Illuminated

signal ring

Thermometer

- At the system ON / OFF switch, switch the boiler rst OFF and then ON again. There must not be any fault
present at the boiler.

- Press reset button for between 30 and 60 seconds after turning on the mains and keep pressed down during
the next step. Setting the address is only possible during this time window.

- After 10 seconds the illuminated signal ring indicates the currently selected gas type (see table: eBUS address).

- Turn the DHW temperature selector towards the required address and check the setting by means of the colour
of the illuminated signal ring.

- The adjustment will only be activated when the reset button is released.

- A successful setting of the eBus address is indicated by a triple ashing yellow/red (0.4 s ON / 1.0 s OFF) of the
signal ring.

Setting the eBUS address
for cascade mode

When operating several boilers (up to 4 control units) in conjunction with a cascade controller KM, adjust
the eBUS address of the boilers in accordance with the table, below.

Table: eBUS address

33

3062347_0309

Start-up gas connection

Only qualied personnel must carry out the
commissioning and boiler operation as well

as the user instruction to prevent dangers
and injuries as well as material losses.



- The boiler and system must be fully vented and must
be absolutely tight.

- If the system water pressure falls below 1.5 bar, top
up with water until a pressure of 1.5 to max. 2.5 bar
has been achieved.

- Check that all ue gas accessories have been correctly
installed.

- The gas red boiler must be switched OFF. Open the
gas shut-off valve.

- Remove the casing cover.

- Release the plug at test nipple  and vent the gas
supply pipe.

Check test nipple  for gas-tightness,
otherwise gas may esc ape, resulting
in a risk of explosion, asphyxiation or
poisoning.

Prior to commissioning, ensure that the boiler corresponds
to the gas type available.

Gas type Wobbe index Ws

kWh/m³ MJ/m³

Natural gas H 11.4 - 15.2 40.9 - 54.7

LPG P 20.3 - 21.3 72.9 - 76.8

Commissioning gas train:

- Pull the hose off and tighten the test nipple again.

- Retighten the plug.

- Start the boiler.

- Check the ignition and the regular ame structure of
the burner.

Never take the boiler into use if the actual value falls
outside the specied limits.
→ Notify gas supply utility.

Gas type Nominal supply pressure,

Permissible range

Natural gas H 20 mbar 18 - 25 mbar

LPG P 50 mbar 43 - 57 mbar

LPG P 37 mbar 25 - 45 mbar

LPG P 29 mbar 25 - 35 mbar

- Connect the hose to the pressure test appliance at
test nipple and check against atmosphere.

- Read off value and enter in the commissioning
report.

34

3062347_0309

- Continue with adjusting of the control unit subject to gas type

- Adjusting the nozzle pressure

- Identication

1. Nozzle change:

- Switch OFF the boiler at the ON/OFF switch and
isolate it from the power supply

- Remove the casing lid of the gas red boiler. For this,
pivot the control unit lid down, hook in the r.h. and l.h.
turnbuckle, undo the lower casing lid and unhook at
the top

- Close the gas valve, observe all safety instructions
and crack open the gas ttings at the gas manifold

- Remove xing screw

- Pull out the gas manifold

- Undo all burner nozzles (spanner size 7) at the gas

manifold

- Insert new burner nozzles with new gaskets

- Reassemble the boiler in reverse order

Table: Number of nozzles, nozzle size

Boiler No. of nozzles Natural gas H LPG/propane

Nozzle ID Nozzle

Ø mm

Nozzle ID Nozzle

Ø mm

CGU-2(K) 18 090 0.90 060 0.60

CGU-2(K) 24 090 0.90 060 0.60

CGG-2(K) 18 087 0.87 057 0.57

CGG-2(K) 24 087 0.87 057 0.57

Conversion to other gas types
CGU-2(K) / CGG-2(K)

Fixing screws

Gas tting

Gas manifold

The conversion to other gas types is made in four steps:

1. Nozzle replacement

2. Adjusting the control unit after converting the gas type

3. Checking and adjusting the nozzle pressure

4.

Identication

Note

Carry out all steps, otherwise there is a risk of
incorrect functions or system damage.

35

3062347_0309

Control unit settings after
gas type conversion

ON / OFF switch

DHW temperature

selector

Pressure

gauge

Reset

button

Heating water

temperature

selector

Illuminated

signal ring

Thermometer

- At the system ON / OFF switch, switch the boiler rst OFF and then ON again. There must not be any fault
present at the boiler.

- Press the reset button within the following 30 seconds and hold it down during the next steps.

- On (CGU) after 5 seconds the currently set gas type is displayed at the signal ring,
see table: Setting gas type.
On (CGG) after 5 seconds the currently set pipe length is displayed at the signal ring.

- Turn the heating water temperature selector towards the required gas type and check the setting by means of
the colour of the illuminated signal ring (see table adjusting the gas type).

- The adjustment will only be activated when the reset button is released.

- A successful conversion of the gas type is indicated by a triple ashing yellow/red (0.4 s ON / 1.0 s OFF) of the
signal ring.

Table: Adjusting the gas type

2. Adjusting the control unit:

Check the nozzle pressure after converting the gas type, otherwise material losses and

incorrect functions can occur.

Gas type Natural gas LPG

Illuminated ring display quickly ashing yellow quickly ashing red

Heating water temperature adjustment

l.h. closing r.h. end stop

Note: The adjustment of the gas type can also be done with the BM accessory controller
(Contractor parameter HG12, description see chapter
"Displaying / modifying control parameters with Wolf control accessories").

Note

36

3062347_0309

Check nozzle pressure

3. Checking and adjusting the nozzle pressure:

- The gas red boiler must be switched OFF.

- Open the gas shut-off valve.

- Remove boiler casing cover and move the control unit
to the front.

- Undo the plug at the test nipple [2].

- (+) Connect the differential pressure tester with a hose
at test nipple [2].

- (-) Connect the differential pressure tester with a hose
at test port [3] of the combustion chamber casing (only
CGG-2(K)).

- Start the boiler by turning the heating water temperature
selector to position 8.

- Read off the nozzle pressure P

min

(at minimum boiler
output) within 180 seconds of ignition (soft start phase
= minimum output).

- Turn the heating water temperature selector further to
the emissions test position [chimney symbol].

- Read off the nozzle pressure P

max

(at maximum boiler

output) within the 15 minute test phase.

- Compare the actual values with those in the table.

- Close the plug again.

[2]

[3]

Gas pressures for gas throughput adjustment according to the nozzle pressure method

Table: Nozzle pressure table

Nozzle pressure in mbar (1013 ±0.5 mbar; 15 °C)

Gas red boilers
(gas fired combi
boilers)

Rated output P
in kW

Rated thermal

load

Q in kW

Natural gas H

W

1

= 45.7 MJ/m³

= 12.7 kWh/m³

LPG P
W1= 70.7 MJ/m³

= 19.6 kWh/m³

CGU-2(K) -18 18.0 20.2 12.7 26.7

15.3 17.3 9.5 20.0

13.0 14.8 7.1 14.8

10.9 12.5 5.2 10.7

8.0 8.8 3.2 5.8

CGU-2(K) -24 24.0 26.5 12.9 25.4

20.4 22.5 9.4 18.7

16.0 18.1 6.3 12.3

13.0 14.9 4.4 8.5

10.9 12.0 3.1 6.0

CGG-2(K) -18 18.0 19.7 15.9 36.0

15.3 16.7 11.4 25.9

13.0 14.2 8.8 19.3

10.9 12.0 6.3 14.1

8.0 8.5 3.3 7.5

CGG-2(K) -24 24.0 26.5 16.8 35.8

20.4 22.5 12.2 26.1

16.0 17.7 7.5 15.9

13.0 14.0 4.8 10.0

10.9 11.7 3.4 7.3

37

3062347_0309

The gas red boiler corresponds to protection level IP X4D and can be installed in bathrooms in safety zone 1 and
more widely in accordance with VDE 0100 Part 701.

Boiler certication

1)

Balanced ue B32 required

Gas throughput table for gas volume adjustment according to the volume ow method

If the actual values fall outside these limits, readjust the gas valve (see the respective chapter),
otherwise material losses at the boiler and incorrect functions can result.

Otherwise continue under the point "Removing the test equipment again".

Note

Gas volume adjustment check

If the actual net caloric value is known, the gas volume can be checked with a stop watch and a gas meter
according to the following formula:

Gas throughput [l/min] =

Rated thermal load [kW] x 1 000

Net caloric value Hi [kWh/m³] x 60

Check nozzle pressure

Boiler Type Category Operating mode

To be connected to

Open

ue

Open

balanced

ue

Chimney

Air /

ue gas

chimney

Balanced

ue system

CGU-2(K)

B

11BS

II

2H3P

X X

CGG-2(K)

B32, C

12x

,

C

32x

, C

42x

II

2H3P

X

1)

X X

1)

X X

Gas red

boilers

(gas red

combi

boilers)

Thermal

output

kW

Rated

thermal

load

kW

Gas throughput in l/min (1013 mbar; 15 °C)

Natural gas H

with an operational net caloric value of H

i

in MJ/m³ (kWh/m³)

25.9(7. 2) 27.4(7. 6) 28. 8(8.0) 30. 2(8.4) 31. 7(8.8) 33. 1(9.2)

34.6(9. 6)

36.0(10. 0) 37. 4(10.4) 38. 9(10.8)

40.3(11. 2)

equivalent of a gross caloric value of HS in MJ/m³ (kWh/m³)

28.8(8.0) 30.2(8.4) 31.7(8.8) 33.8(9.4) 35.3(9.8) 36.7(10.2) 38.1(10.6) 40.0(11.1) 41.8(11.6) 43.2(12.0) 4.6(12.4)

18.0 20.2 47.0 44.5 42.3 40.3 38.4 36.8 35.2 33.8 32.5 31.3 30.2

15.3 17.2 40.0 37.9 36.0 34.3 32.8 31.3 30.0 28.8 27.7 26.7 25.7

CGU-2(K) -18 13.0 14.8 34.3 32.5 30.8 29.4 28.0 26.8 25.8 24.7 23.7 22.8 22.1

10.9 12.5 28.9 27.4 26.0 24.8 23.7 22.6 21.6 20.9 20.0 19.3 18.6

8.0 8.8 21.3 20.2 19.2 18.3 17.4 16.7 16.0 15.4 14.7 14.2 13.7

24.0 26.5 61.3 58.1 55.2 52.6 50.2 48.0 46.1 44.3 42.4 40.8 39.5

20.4 22.5 52.8 40.0 47.5 45.2 43.2 41.3 39.7 38.0 36.5 35.1 34.0

CGU-2(K) -24 16.0 18.1 41.9 39.7 37.7 35.9 34.3 32.8 31.5 30.2 29.0 27.9 27.0

13.0 14.9 34.5 32.7 31.0 29.6 28.2 27.0 25.9 24.8 23.9 23.0 22.2

10.9 12.0 28.9 27.4 26.0 24.8 23.7 22.6 21.8 20.9 20.0 19.3 18.6

18.0 19.7 45.6 43.5 41.0 39.9 37.3 35.7 34.1 32.8 31.5 30.4 29.3

15.3 16.7 38.6 36.6 34.8 33.1 31.7 30.2 29.0 27.8 26.7 25.8 24.8

CGG-2(K) -18 13.0 14.2 32.8 31.1 29.6 28.2 26.9 25.8 24.8 23.7 22.8 21.9 21.2

10.9 12.0 27.8 26.3 25.0 23.8 22.7 21.8 20.6 20.0 19.3 18.5 17.9

8.0 8.5 19.6 18.6 17.7 16.8 16.1 15.4 14.8 14.2 13.6 13.1 12.7

24.0 26.5 61.3 58.2 55.2 52.6 50.2 48.0 49.0 44.2 42.5 40.9 39.4

20.4 22.5 52.1 49.3 46.9 44.6 42.6 40.8 39.1 37.5 36.6 34.8 33.5

CGG-2(K) -24 16.0 17.7 41.0 38.8 36.9 35.1 33.5 32.1 30.8 29.5 28.4 27.4 26.3

13.0 14.0 32.4 30.7 29.2 27.7 26.5 25.4 24.3 23.3 22.4 21.6 20.9

10.9 11.7 27.0 25.6 24.4 23.2 22.1 21.2 20.3 19.5 18.8 18.1 17.4

38

3062347_0309

Readjusting the gas valve:

Carry out the nozzle pressure adjustment in the following
order:

- Remove transparent plastic cap [4] from the gas
combination valve.

- Operate the boiler in emissions test mode (P

max

).

-

Adjust the maximum pressure at nut [5] (spanner size 10).

- Tightening increases the pressure.

- Releasing reduces the pressure.

- Pull the cable from the gas valve. The boiler goes to
minimum output (P

min

).

- Adjust the minimum pressure at screw [6] in accordance
with nozzle pressure table (Philips screwdriver 6x1);
during this adjustment, hold nut [5] tightly.

- Turning right increases the pressure.

- Turning left reduces the pressure.

- Replace the plastic cap [4].

- Reconnect the cable.

[4]

[6]

[5]

4. Identication:

Carry out the re-designation of the gas type in
accordance with the instructions supplied with the
conversion kit.

Remove the test equipment:

Readjust the gas valve

Checking / adjusting the nozzle pressure

- Shut down the boiler. Close the gas shut-off valve.

- Pull the hoses off and retighten the test nipple [2] and
the test port [3]. Open the gas shut-off valve.

Check gas tightness of the test nipple,
otherwise there is a danger of gas escaping
and consequent damage to health.

[2]

39

3062347_0309

Flue gas

pipe length

CGG-2(K)

Position

Rotary selector

Temperature

selection

DHW

Illuminated ring

display
(green)

Calculated length

(m)

1

1

1x0.4 s ON/OFF

1x1.5 s pause

1.3 - 1.5

2 2

2x0.4 s ON/OFF

1x1.5 s pause

1.5 - 2.5

3 3

3x0.4 s ON/OFF

1x1.5 s pause

2.5 - 3.5

4*

(factory setting)

4

4x0.4 s ON/OFF

1x1.5 s pause

3.5 - 4.0

5* 5

5x0.4 s ON/OFF

1x1.5 s pause

4.0 - 5.0

ON / OFF switch

DHW temperature

selector

Pressure

gauge

Reset

button

Heating water

temperature

selector

Illuminated

signal ring

Thermometer

- At the system ON / OFF switch, switch the boiler rst OFF and then ON again. There must not be any fault
present at the boiler.

- Press the reset button within the following 30 seconds and hold it down during the next steps.

- After 5 seconds, the illuminated signal ring indicates the currently selected gas type
(see table: Pipe length adjustment).

- Turn the DHW temperature selector towards the required pipe length and check the setting by means of the
ash sequence of the illuminated signal ring.

- The adjustment will only be activated when the reset button is released.

- A successful conversion of the gas type is indicated by a triple ashing green (0.4 s ON / 1.0 s OFF)
of the signal ring.

Adjusting the ue lengths CGG-2(K)

Note: The adjustment of the ue pipe length can also be done with the BM accessory controller
(Contractor parameter HG12, description see chapter
"Displaying / modifying control parameters with Wolf control accessories").

* Operation only with condensate drain pipe in the balanced ue routing (see accessories)

Table: Pipe length adjustment

40

3062347_0309

Flue gas test CGU-2(K) / CGG-2(K)

The ue gas emissions must be tested with the boiler
closed.

- Remove the screw from the test port "inlet air".

- Insert the test probe until it bottoms out.

- Start the boiler and turn the heating water temperature
selector to emissions test [chimney sweep symbol].
(The illuminated status display ring ashes yellow).

- Test the temperature and CO

2

or O2 value.

The balanced ue is not gas-tight if the CO2 content

≥ 0.3%; rectify the leak.

- After the test has been completed, switch the boiler
OFF, remove the test probe and close the test port.
Ensure the screws are seated rmly.

Testing the combustion air CGG-2

Vertical boiler ue connection

- Remove the screw from the test port "ue gas".

- Insert the test probe into the centre of the pipe.

- Start the boiler and turn the heating water temperature
selector to emissions test [chimney sweep symbol].
(The illuminated status display ring ashes yellow).

- Test the temperature and CO2 value.

The CO2 value should be tested at maximum heat

output. Take the values from the table on the right.

- After the test has been completed, switch the boiler
OFF, remove the test probe and close the test port.
Ensure the screws are seated rmly.

Testing the ue gas parameter at CGG-2

Flue gas can escape into the installation
room, if the test port is left open. This
results in a risk of asphyxiation.

Horizontal boiler ue connection

Testing the ue gas parameter at CGU-2

- Insert the test probe into the ue pipe and nd the core
ow.

- Record ue gas values.

- Take out the test probe and close test port.

Fig.: Flue gas test CGU-2(K)

Gas type Natural gas H LPG P

CO2 - value in %

8.0 9.3

The CO2 value may deviate by a maximum of ± 1%.

41

3062347_0309

Limiting the maximum output

The output setting can be modied with Wolf control accessories with eBUS capability via parameter HG 02, 03, 04.
The heating output will be determined by the modulation current of the gas valve. By reducing the modulation current
in accordance with the table, the maximum output will be matched at 80/60 °C to natural gas H and LPG.

Output [kW]

Modulation current [%]

Output [kW] 10.9 12 15 18 21 24

I

Mod

[%] 0-27 33 46 60 75 100

Output [kW]

Modulation current [%]

Output [kW] 8 10 12 14 16 18

I

Mod

[%] 0-27 39 52 65 77 100

Output adjustment 18 kW

Output adjustment 24 kW

42

3062347_0309

Selecting the pump stage / bypass

Fig.: Pump rate stages at the heating circuit pump

Bypass valve

The boiler is equipped with a three-stage pump that is
set to stage 2 in the delivered condition.

The minimum circulation volume is ensured by a
connection line between the ow and return. An
automatic overow valve and a manually adjustable
bypass valve are integrated into the connection line.
In the delivered condition, the bypass valve is fully
opened to "MAX".
Closing the valve can increase the residual head.
(see "Selecting the pump stage / bypass").

Stage 1

Stage 2

Stage 3

43

3062347_0309

Bypass valve CGU-2(K)-18 / CGG-2(K)-18 completely open (delivered condition)

Residual head [mbar]

Pump rate [l/h]

Pump stage

Bypass valve CGU-2(K)-18 / CGG-2(K)-18 closed

Residual head [mbar]

Pump rate [l/h]

Bypass valve CGU-2(K)-24 / CGG-2(K)-24 completely open (delivered condition)

Residual head [mbar]

Pump rate [l/h]

Bypass valve CGU-2(K)-24 / CGG-2(K)-24 closed

Residual head [mbar]

Pump rate [l/h]

Selecting the pump stage / bypass

Pump stage

Pump stage

Pump stage

44

3062347_0309

Checking the ue gas monitoring CGU-2(K)

The electronic ue gas monitoring switches off the gas
boiler CGU-2(K) at the ue outlet on the draught hood. The
boiler restarts automatically after approx. 15 mins.

A regular check must be carried out on the function
of the ue gas monitoring. If something is wrong
with the function of the ue gas monitoring, the
gas boiler must not be operated, as ue gas can
escape, causing a danger of poisoning.

Proceed as follows:

• Shut down the boiler.

• Raise ue pipe or boiler connection bend and cover
ue gas connection to the draught hood with a plate.

• Start the boiler.

• Enable emissions test mode.
The signal ring ashes yellow.

If functioning perfectly, the ue gas monitoring switches
off after 2 mins at the latest.

•

Remove cover plate. Re-install ue pipe or ue bend.

• The boiler restarts automatically after approx.
15 mins.

Reassemble all components and test for functional
reliability.

Observe all maintenance safety instructions.

Flue gas connection Coverplate

Fig.: Uncover ue gas connection

Checking the ue gas monitoring CGU-2(K)

45

3062347_0309

Engineering information – balanced ue system

The maximum lengths identified in the table
under "Adjusting the ue pipe lengths" must not
be exceeded, otherwise incomplete combustion
can occur, resulting in damage to the boiler and

in particular moisture related damage to the
system.

If the CO content in the flue gas is higher

than 300 ppm (free of air), remove the cause;

otherw ise do not continue to operate the

gas red boiler, as there would be a risk of
ue gas escaping, resulting in the danger of

poisoning.

Wolf boilers are certied as one unit with the
original Wolf balanced ue system. Use only
original Wolf balanced flue systems. Using

alternative accessories can lead to incorrect
functions. Material losses and injuries cannot

then be prevented.

General information:

From a length of 2.5 m upwards, we recommend the installation of a condensate trap.

Calculating the ue length 60/100 mm

Calculated ue length = length of straight pipes + 1.0 m per 90° bend / tee + 0.5 m per 45° bend

Type C12x

Outside wall connection (balanced ue)
concentric horizontal system 60/100 mm
calculated pipe length min / max = 0.3 / 5.0 m

Type C32x

Roof outlet (balanced ue)
concentric vertical system 60/100 mm
calculated pipe length min / max = 0.3 / 5.0 m

Type C42x

Connection to a room sealed balanced ue
(balanced ue)
concentric system 60/100 mm

A+B<2m

Connection to a chimney;
ventilation air directly via the boiler or through a horizontal
concentric supply line (open ue)
concentric system 60/100 mm

Type B32

A+B<2m

46

3062347_0309

Vertical balanced ue system LAF CGG-2(K)

The following applies to gas red combi boilers

with a balanced ue above the roof, where only
the roof structure lies above the ceiling:

If re resistance is required for the ceiling, the

pipes for combustion air supply and ue gas
exhaustion running between the top edge of
the ceiling and the roof skin must be run inside
a liner, that provides the same re resistance
and is constructed from non-combustible
materials. There is a risk of res spreading, if
these requirements are ignored.

If re resistance is not required for the ceiling,

route the lines for the combustion air supply
and the ue gas from the top edge of the
ceiling to the roof skin inside a duct made from
non-combustible, rigid materials or inside a
protective metal pipe (mechanical protection).
There is a risk of res spreading, if these
requirements are ignored.

If the balanced ue crosses different oors,

route the pipes outside the boiler room inside
a duct with a re resistance of at least 90 min.,
and in living spaces of low height with a
resistance of at least 30 min. Plastic ues
are not permissible. Fire may spread if these
instructions are not observed.

The rated boiler output must be reduced to below

11 kW, if the gas red combi boiler is installed on
an external wall (balanced ue via an external
wall).

A clearance between the balanced ue and combustible
materials or components is not required, as temperatures
are limited to 85 °C at the rated boiler output.

Balanced ues without ducts must not be

routed through other rooms, otherwise there
is a risk of transferring re, and a mechanical
protection is not ensured.

Vertical balanced ue system (LAF) horizontal CGG-2(K)
through an external wall

If a condensate trap is installed horizontally or
vertically in the balanced ue, the tightness of the
plugs needs to be regularly checked to guard against
ue gas escaping. If the plug is not working properly
the boiler must not be operated, as ue gas may
escape, causing a danger of poisoning.

7

2

5

2b

12

11

17

12

11

17

4

9

9

125-170 mm

Engineering information – balanced ue system

3b

If the balanced ue routing is longer than

2.5 m and the heating demands are very low,
a condensate trap is recommended, to avoid
moisture damage to the gas boiler (see Wolf
accessories).

3b

11

5

125-170 mm

Note

Note

47

3062347_0309

1 Gas red boiler

2 Boiler connection (straight)

2b Boiler connection bend 90°, for connection to the gas red boiler

3 Sliding coupling

3b Condensate trap horizontal or vertical

4 Balanced ue incl. inspection aperture 250 mm

5 Lengths of straight balanced ue: 500 mm, 1 000 mm

6 Bend 45°, for connecting two balanced ues

7 Bend 90°, for connecting two balanced ues

8 Balanced ue routing vertical, (three-layered roof outlet) for at or pitched roof

9 Balanced ue routing horizontal, incl. cowl

10 Connection to a ue gas chimney B32 length 65 mm with air apertures

11 Rosette for internal walls

12 Rosette for external walls

13 Flat roof collar

14 Universal tile or roof plate or "Klöber" adaptor for pitched roof part 1

15 Universal tile or roof plate or "Klöber" adaptor for pitched roof part 2

16 Mounting bracket for roof outlet

17 Spacer clip

19 Balanced ue for connection to an existing room sealed balanced ue, length: 300 mm

20 Connector for balanced ue chimney length 962 mm

Vertical balanced ue system (LAF) vertical CGG-2(K)

3

5

6

8

1

4

7

2

2b

1

1

13

8

8

6

4

5

5

4

16

15

17

14

2

Engineering information – balanced ue system

48

3062347_0309

Connector for ue gas chimney B32

The ue gas chimney connection (17)
must be installed directly to the ue gas
chimney in accordance with the gure
shown (no extension piece between
ue gas chimney and ue outlet).

The air vents to the boiler room must be
free from obstruction.

The relevant local ue inspector must
check the suitability of the ue chimney
before installation.

Connection to room sealed balanced ue and ue gas chimney

Installation information:

e.g. System Plewa e.g. System Schiedel

19/20 19/20

Install with a 1-3% outwards slope.
Install the centring appliances near the end of the pipe.

If an inspection aperture is required for
the balanced ue, insert a balanced ue
with inspection aperture (4).

12

9

11

Air apertures

10

2b

4

17

1

Flat roof: Ceiling outlet
approx. 120 mm Ø
a ff ix 1 3 i nto r o of

cover.

Pitched roof: At 15 observ e the

installation instructions
on the cowl, regarding
roof pitches.

Insert the roof outlet 8 from above
through the roof and secure vertically
with 16 to a rafter or brickwork.
Install the roof outlet only in its original

condition.

Modications are not permissible.

If an inspection aperture is required for the balanced ue,
insert a balanced ue with inspection aperture (4). When the
LAF length is greater than 2 m, when installing the boiler in
a cold area and/or the required heating output lies below
15 kW, we recommend the installation of a three-layered­roof outlet (insulated).

13

8

16

17

15

14

Engineering information – balanced ue system

49

3062347_0309

Notes:
Use the screws supplied to connect the boiler.

Installation information:

Flue gas damper for CGU-2(K)

The installation of ue gas dampers is only permissible
if they have been prescribed by the local ue inspector.
With thermal ue dampers only Diermayer dampers
of type GWR-T from the Wolf product range may be
used, as only these meet the approval requirements
and are checked for functionality. When other thermal
ue gas dampers are used approval of the gas boiler
is invalidated.

The installation of motorised ue gas dampers is
recommended. These dampers must have a CE
approval and are connected at the terminal box of the

control unit.

Straight balanced ues must not be more

than 2 m long, when connecting the system
to a balanced ue chimney. In addition to the
boiler connection bend, a maximum of two 90°
diverters may be installed. Nonobservance
can lead to function errors.

Information about disposal:

We are happy to accept the return of your old
Wolf boiler free of charge at one of our delivery
depots.

Determine distance A. Flue length (internal) = A-25 mm

Offset

Distance A

Distance A

Bends Offset

90° min. 140 mm
45° min. 105 mm

6

4

6

7

17

17

7

6

6

4

Engineering information – balanced ue system

Note

50

3062347_0309

Commissioning CGU-2(K) / CGG-2(K) Actual value or conrmation

1)

Gas type Natural gas H

LPG

Wobbe Index_____________________kWh/m³

Net caloric value_________________kWh/m³

2)

Calculated ue length

_______________________________________ m

No.____________________ /_______________ mm

3)

Gas supply pressure checked?

______________________________________ mbar

4)

Nozzle pressures checked?

(only complete when changing the gas type):

5)

Gas leak test carried out?

6)

Balanced ue system,

tightness of condensate trap (optional), checked?

7)

Water connections checked for leaks?

8)

Boiler and system vented?

9)

System pressure 1.5 - 2.5 bar?

10)

Function test carried out?

11)

Casing tted?

12)

System user trained, tech. docs. handed over?

13)

Conrm commissioning?

Company / Name

Date / Signature

________________________________________

______________ / _________________________

Commissioning report

51

3062347_0309

Inspection and maintenance steps /
Service report

Report about the inspection and service work

Advise the system user that an approved contractor should clean and check the heating system
annually, to safeguard the reliable and economic function of his heating system and to avoid risks

to individuals and prevent material losses.

Note

No. Step to be implemented

always if required

Maintenance 1

1 Switch OFF the boiler, isolate it from the power supply

and close the gas valve

x

2 Close the shut-off valves on the water and heating

water side

x

3 Remove the gas burner and check for contamination x
4 Clean the gas burner and gas nozzles x

5 Check the heating water heat exchanger for

contamination

x

6 Clean the heating water heat exchanger x
7 Reinstall the gas burner x

8 Clean and ret the DHW heat exchanger x
9 Clean and ret the strainer in the cold water inlet x
10 Check the tightness of electrical plug-in connections x
11 Check the condition of the ignition and ionisation

electrodes

x

12 Replace the electrodes, if required x
13 Re-open the shut-off valves on the water and heating

water side

x

14 Check the hydraulic component for possible leaks x
15 Open the gas valve and start the boiler x
16 Check the ignition and burner characteristics x

17 Check the gas components for soundness x
18 Checking the ue gas monitoring CGU-2(K) x
19 Check condensate trap, plug (if provided) with

CGG-2(K) balanced ue

x

20 Conrm the inspection or service steps

Supplied by

____________________________

Name _________________________________

Date __________________________________

Signature ______________________________

Stamp

We recommend users arrange a service contract.

52

3062347_0309

Inspection and maintenance steps /
Service report to copy

Report about the inspection and service work

No. to be implemented

always if required

Maintenance 2Maintenance 3Maintenance 4Maintenance 5Maintenance

6

1 x

2 x
3 x
4 x

5 x

6 x
7 x

8 x

9 x

10 x
11 x
12 x
13 x

14 x
15 x
16 x

17 x
18 x
19 x

20

We recommend users arrange a service contract

53

3062347_0309

Maintenance

Cleaning the gas burner:

- Switch OFF the boiler at the ON / OFF switch,
isolate it from the power supply and close the gas
valve

- Remove the casing lid of the gas red boiler. For
this, pivot the control unit lid down, hook in the r.h.
and l.h. turnbuckle, undo the lower casing lid and
unhook at the top

- Push the retaining clip of the front cover up or down
out of the way and remove the front cover (only
with CGG-2(K)).

- Drain heating water, catch any water in a suitable

container

- Detach cables from the ionisation electrode [1] and
plug-in connection on the ignition electrode on the
gas combi valve

- Burner - remove xing screws [2]

- Slacken the union nut on the flow and return
connection of the burner unit [3]

- Release the union nut of the gas supply pipe [4].

- The burner can be pulled out of the mounting
bracket by applying light outward pressure

- In its disassembled state both the electrodes and
the gas distributor pipe can be removed [5]

- Remove combustion residues with a brush
(non-metallic)

- Clean the nozzles and injectors, if required, with
a soft brush and compressed air

- Wash severely contaminated burners with a soapy
solution and rinse with tap water

- The burner is reinstalled in reverse order, but only
after cleaning the heating water heat exchanger

Fig.: Removed burner unit

Gas distributor pipe hexagon nuts [5]

Fig.: Cleaning the gas burner

Ionisation electrode [1] Ignition electrode [1]

Burner unit xing screws [2]

Burner unit union nuts [3]

Gas supply line union nut [4]

Fig.: Cleaning the gas burner

Burner unit xing screws [2]

Please note: carry out in parallel with the other side
Fig.: Cleaning the gas burner

54

3062347_0309

Maintenance

Cleaning the heating water heat exchanger:

- Detach cable from ventilator (only CGG-2(K))

- Undo the fan xing screw [6] and remove the fan
(only CGG-2(K)).

- After undoing both xing screws, remove the front
wall of the combustion chamber [7].

- Detach ue gas temperature limiter

(only CGU-2(K)) [8]

- Remove ue pipe or bend and remove ue collectors
or draught hood from front or above

(Please note: when assembling CGU-2(K) at the rear

edge of the draught hood, push between the heating
water heat exchanger and guide rails)

- Clean the heating water heat exchanger from the
top and the bottom with a brush (non-metallic) and, if
required, blow off residues with compressed air

During this step, take care not to bend the ns. If

necessary straighten them with a pair of pliers [9]

Disassemble severely contaminated heating water

heat exchangers

- Before disassem bling the heating water heat
exchanger depressurise and isolate the system
on the water side, close gas valve, observe safety
instructions

- Remove 2 x retaining clips from the ow-return heating
water heat exchanger, placing them at the front [10]

- Disassemble heating water heat exchanger by
lightly shaking it free from above the pipework
(pay attention to O-ring thicknesses)

- Clean heating water heat exchanger with a soapy
solution

- Reassemble the components in reverse order

Draught hood

Heating water heat exchanger

Fig.: Heating water heat exchanger removal

Remove retaining clips [10]

Fig.: Heating water heat exchanger [9]

Flue gas
temperature
limiter [8]

Fig.: CGU-2(K)

Flue gas

collector

Fixing screws
of ventilator [6]

Combustion
chamber xing
screws [7]

Fig.: CGG-2(K)

55

3062347_0309

Maintenance

Cleaning the DHW heat exchanger

Subject to the water quality it may be advisable to
regularly descale the DHW heat exchanger on the
DHW side.
For this the disassembly of the hydraulic group is
required.

Take the hydraulic assembly apart as follows:

- Hydraulically depressurise the system, collecting

water in a suitable container.
Switch OFF the mains electrical isolator.
Close the gas valve, paying attention to safety

instructions.

- Pull out all 4 interlocking brackets (2) approx. 2 cm

(see arrows - do not dismantle)

- Unlock both safety catches (3) by turning the

screws to the left (see both views - SW 6)

- Pull out brackets (4) for sensors and

thermomanometer to the right and remove them

- Open expansion vessel screw connection (5)
and pull forward (SW 24)

- Open gas screw connection (6)

and turn to the side (SW 24)

- Open piping safety valve (on-site)
Remove alternative valve (7) by undoing the
brackets

- Interlocking of ow and return (8) open by turning

90° to left, then press pipes to the side

(pay attention to O-rings)

- Disconnect electric connector cables (9) from

diverter valve, water sensor, pump, etc.
(Plugs are encoded to prevent confusion)

- Now pull complete hydraulic group upwards
by shaking it lightly, then remove forwards

- Release the two xing screws (10) on the

disassembled hydraulic group with a 4 mm Imbus

Allen key

10

56

3062347_0309

Fig.:

View of dismantled heating water heat exchanger

- Remove the heat exchanger and treat with a
commercially available descaler

Please note:

When reinstalling make sure the four rubber

gaskets are in the right position and the mounting
position is correct

When reinstalling pay attention to the inscription on

the heating water heat exchanger. Look underneath
(see photo)

- The reinstallation proceeds in reverse order, coat
O-rings with silicon grease

- When lling the boiler, proceed in accordance with
the corresponding chapter in these instructions.
Only ll after having cleaned the strainer in cold

water inlet

Please note when reinstalled:
Look underneath the heating water heat
exchanger for inscription.

Maintenance

Replacing the expansion vessel

- Procedure same as with cleaning the heating water
heat exchanger and cleaning gas burner

- Undo xing screws on expansion vessel, gas
supply line and heating water heat exchanger [11]

-

Detach cables from the ionisation electrode [1]
and plug-in connection on the ignition electrode
on the gas combi valve

-

Loosen upper xing brackets (do not dismantle) [12]

- Remove xing screw [13]

- Pull thermal bracket completely up and forward [14]

- Replace expansion vessel

- Reassemble the components in reverse order

Fixing screw
underneath [13]

Screw connection
Expansion vessel
Gas supply line [11]

Fixing screw above [12]

Mounting bracket [14]

Checking the expansion vessel

- The test connection on the expansion vessel
is on the top, behind the draught hood

57

3062347_0309

Cleaning the strainer in the cold water inlet

- Close the cold water inlet on the system side.

- Remove the cold water inlet shut-off valve on the
equipment side. Catch any escaping water in a
suitable container.

- Pull out the strainer and blow thr o ugh with
compressed air or clean it under fresh running
water.

- Reassemble in reverse order using new gaskets.

Note:

As standard, a combined cold water strainer

with throughput controller [16] is tted at the
cold water connection [15] of the boiler (see
diagram).

[16]

[15]

Fig.: Throughput controller with cold water strainer

Maintenance

After a maintenance check proceed according to chapter "Commissioning procedure".

58

3062347_0309

Wiring diagram CGU-2(K)

Anschlußkasten:

Netz 230VAC 50Hz

A1 konfigurierbarer Ausgang

AK Abgasklappe

E1 konfigurierbarer Eingang

eBus Busanschluss für externes Regelungszubehör

AF Außenfühler

+

-

>

bn
ws

ws

sw

bl

bn

gn

gr

gn

bn

ws

ge

+

+

GND

GND

+

+

GND

GND

GND

GND

GND

GND

VCC

FS

TS

3

6

1

2

4

5

green

yellow

red

GND

LED

-

+

eBus

gr

rs

rt

bl

1

2

4

3

Y2

Y3

Y1

V

T

V

Fl

rt

bn

or

sw

sw

rt

bn

ge

or

gn

ge

gr

rs

rt

bl

bn

bl

bn

sw

ws

rt

sw

bl

bn

>

ws

GND

GND

ws

sw
or
bn

rt

bn
gn

rs

ge

ws

+

GND

gr

21

rt

bn

or

sw

bn

bl

ge/gr

rt

bn

or

Netz

A1

AK

o ooooo

MT

3,15 A

sw

bl

bn

ge/gr

bn

gn

gr

rs

ge

ws

B5 Ionisation

Y1

Gaskombiventil

E1

Zündeinheit

Pumpe

M1

S1 ASW

(Abgasströmungs-

wächter)

S2 VL-TB

(Temperaturbegrenzer

Vorlauf)

B1 VL-1

(Vorlauffühler1)

B2 VL-2

(Vorlauffühler2)

E2

PWM

B4

Speicherfühler

B3

WW-Durchfluss-

sensor

M2

3-Wege-Ventil-

Motor

eBus-Stecker

L1

N

N

L1

L1

N

F1

br

bl

ge/gn

rt

gr

sw

ws

E1

1

2

1

2

1

2

eBus AF

21

ws

Netz L

Netz N

Zubehör L´

RT / AK-Rück

Zubehör N´

Ausgang 1 L

AK L

GKV 1 / GKV 2 L

Zündung L

GKV ½ / Zündung N

Schichtladepumpe L

Schichtladepumpe N

Abgasventilator L

Abgasventilator N

Gerätepumpe L

Gerätepumpe N

PE

eBus

Außenfühler

Eingang 1

Ionisation

Vorlauffühler 1

Vorlauffühler 2

DDW / ASW

Hallsensor

VCC

N

GND

+

+

+

+

Vorlauf-TB

Speicherfühler

PWM Pumpe

Modulation

WW-Durchfluss- &

Temperatursensor

+

Schrittmotor

3-Wege-Ventil

GND

+

0 = CGU-2 / 1 = CGG-2

sw

1

3

2

4

1: sw

2: rt

3: bn

4: ge

5: or

6: gn

3

2

1

6

5

4

Stecker 3-Wege-Ventil-Motor

(Ansicht: Kabelseite)

Stecker WW-Durchflusssensor

(Ansicht: Kabelseite)

1: or

2: bn

3: sw

4: rt

X1

X2

X3

X4

X5

X6

Terminal box:

Power 230VAC 50Hz

A1 Programmable output

AK Flue gas damper

E1 Programmable input

eBus BUS connection for external control accessories

AF External sensor

Power L

Power N

Accessories L

RT / AK return

Accessories N

Output 1 L

AK L

GKV 1 / GKV 2 L

Ignition L

GKV ½ / ignition L

Stratication pump L

Stratication pump N

Flue gas fan L

Flue gas fan N

Appliance pump L

Appliance pump N

PE

eBus

External sensor

Input 1

Ionisation

Flow temperature sensor 1

Flow temperature sensor 2

DDW / ASW

Hall sensor

Flow TB

Cylinder sensor

PWM pump

Modulation

DHW ow &

temperature sensor

Stepper motor

Three-way valve

0 = CGU-2 / 1 = CGG-2

X 1 X 2 X 3 X 4 X 5 X 6

eBUS plug

green

yellow

red

GND

1. bk

2. rd

3. br

4. ye

5. or

6. gn

1. or

2. br

3. bk

4. rd

Plug DHW ow sensor

(view: Cable side)

Plug three-way valve motor

(view: Cable side)

M2

Three-way valve

motor

B3

DHW ow sensor

B1 VL-1

(ow sensor 1)

B2 VL-2

(ow sensor 2)

S1 ASW

(ue gas ow

monitor)

S2 VL-TB

(ow temperature

limiter)

Pump

M1

E1 Ignition unit

B4

Cylinder sensor

Y1 Gas combi valve

B5 Ionisation

Power

br = bn

bl = bl

ge = ye

gn = gn

ws = wh

rt = rd

gr = gy

sw = bk

rs = рk

bn = bn

or = or

59

3062347_0309

Wiring diagram CGG-2(K)

Anschlußkasten:

Netz 230VAC 50Hz

Z Zubehöranschluss geschalten 230VAC 50Hz

A1 konfigurierbarer Ausgang

E1 konfigurierbarer Eingang

eBus Busanschluss für externes Regelungszubehör

AF Außenfühler

+

-

>

bn
ws

ws
sw

bl

bn

gn

gr

gn

bn

ws

ge

+

+

GND

GND

+

+

GND

GND

GND

GND

GND

GND

VCC

FS

TS

3

6

1

2

4

5

green

yellow

red

GND

LED

-

+

eBus

gr

rs

rt

bl

1

2

4

3

Y2

Y3

Y1

V

T

V

Fl

rt

bn

or

sw

sw

rt

bn

ge

or

gn

ge

gr

rs

rt

bl

bn

bl

bn

sw

ws

rt

sw

bl

bn

>

ws

GND

GND

ws

sw
or
bn

rt

bn
gn

rs

ge

ws

+

GND

21

rt

bn

or

sw

rt

bn

or

Netz

Z

A1

o ooooo

MT

3,15 A

sw

bl

bn

ge/gr

bn

gn

gr

rs

ge

ws

B5 Ionisation

Y1

Gaskombiventil

E1

Zündeinheit

Pumpe

M1

S1 DDW

(Differenzdruck-

sensor)

S2 VL-TB

(Temperaturbegrenzer

Vorlauf)

B1 VL-1

(Vorlauffühler1)

B2 VL-2

(Vorlauffühler2)

E2

PWM

B4

Speicherfühler

B3

WW-Durchfluss-

sensor

M2

3-Wege-Ventil-

Motor

Betriebsanzeige

und Resettaster

eBus-Stecker

Schnittstelle zum

Bedienmodul

L1

N

N

L1

F1

br

bl

ge/gn

rt

sw

E1

1

2

1

2

1

2

eBus AF

21

ws

Netz L

Netz N

Zubehör L´

RT / AK-Rück

Zubehör N´

Ausgang 1 L

AK L

GKV 1 / GKV 2 L

Zündung L

GKV ½ / Zündung N

Schichtladepumpe L

Schichtladepumpe N

Abgasventilator L

Abgasventilator N

Gerätepumpe L

Gerätepumpe N

PE

eBus

Außenfühler

Eingang 1

Ionisation

Vorlauffühler 1

Vorlauffühler 2

DDW / ASW

Hallsensor

VCC

N

GND

+

+

+

+

Vorlauf-TB

Speicherfühler

PWM Pumpe

Modulation

WW-Durchfluss- &

Temperatursensor

+

Schrittmotor

3-Wege-Ventil

GND

+

0 = CGU-2 / 1 = CGG-2

sw

1

3

2

4

1: sw

2: rt

3: bn

4: ge

5: or

6: gn

3

2

1

6

5

4

Stecker 3-Wege-Ventil-Motor

(Ansicht: Kabelseite)

Stecker WW-Durchflusssensor

(Ansicht: Kabelseite)

1: or

2: bn

3: sw

4: rt

ge/gn

bn

bl

bn

bl

ge/gr

Ventilator

M3

bn

bl

P

sw

rt

bn

sw

rt

bn

1

2

3

Stecker Hallsensor

(Ansicht: Kabelseite)

1: rt

2: bn

3: sw

X

Hallsensor

B6

N

L1

ws

X1

X2

X3

X4

X5

X6

Terminal box:

Power 230VAC 50Hz

Z Accessory connection switched 230VAC 50Hz

A1 Programmable output

E1 Programmable input

eBus BUS connection for external control accessories

AF External sensor

Power L

Power N

Accessories L

RT / AK return

Accessories N

Output 1 L

AK L

GKV 1 / GKV 2 L

Ignition L

GKV ½ / ignition L

Stratication pump L

Stratication pump N

Flue gas fan L

Flue gas fan N

Appliance pump L

Appliance pump N

PE

eBus

External sensor

Input 1

Ionisation

Flow temperature sensor 1

Flow temperature sensor 2

DDW / ASW

Hall sensor

Flow TB

Cylinder sensor

PWM pump

Modulation

DHW ow &

temperature sensor

Stepper motor

Three-way valve

0 = CGU-2 / 1 = CGG-2

X 1 X 2 X 3 X 4 X 5 X 6

Operating display and reset

button

eBUS plug

Interface to programming

module

green

yellow

red

GND

1. bk

2. rd

3. br

4. ye

5. or

6. gn

1. or

2. br

3. bk

4. rd

1. ro

2. az

3. ne

Plug Hall sensor

(view: Cable side)

Plug DHW ow sensor

(view: Cable side)

Plug three-way valve motor

(view: Cable side)

M2

Three-way valve

motor

B3

DHW ow sensor

B1 VL-1

(ow sensor 1)

B2 VL-2

(ow sensor 2)

S1 DDW

Differential

pressure sensor

S2 VL-TB

(ow temperature

limiter)

Pump

M1

Hall sensor

B6

Fan M3

E1 Ignition unit

B4

Cylinder sensor

Y1 Gas combi valve

B5 Ionisation

Power

br = bn

bl = bl

ge = ye

gn = gn

ws = wh

rt = rd

gr = gy

sw = bk

rs = рk

bn = bn

or = or

60

3062347_0309

Specication

Type CGU-2(K) 18 CGU-2(K) 24

Rated output kW 18 24

Rated thermal load kW 20.2 26.5

Lowest output (modulating) kW 8.0 10.9

Lowest thermal load (modulating) kW 8.8 12.0

Standard efciency at 75/60 °C (Hi/Hs) % 93/85 94/85

Outside diameter, heating ow G ¾" ¾"

Outside diameter, heating return G ¾" ¾"

DHW connection (or cylinder connection) G ¾" ¾"

Cold water connection (or cylinder connection) G ¾" ¾"

Gas connection G ¾" ¾"

Balanced ue connection mm 110 130

Gas supply details:
Natural gas H (Hi = 9.5 kWh/m³ = 34.2 MJ/m³)
LPG P (Hi = 12.8 kWh/kg = 46.1 MJ/kg)

m3/h

kg/h

2.1

1.5

2.8

2.1

Gas supply pressure:

Natural gas

LPG P

mbar
mbar

20

50

20

50

Flow temperature (setting range) °C 40-90 40-90

Heating water temperature range ( preselected ) °C 40-80 40-80

Max. overall pressure, heating bar 3 3

Heating water heat exchanger

2)

water content l 0.5 0.5

Residual pump head: Pump stage 1/2/3
430 l/h supply volume (10 KW at

∆t = 20 K) mbar

770 l/h supply volume (18 KW at

∆t = 20 K) mbar

1 030 l/h supply volume (24 KW at

∆t = 20 K) mbar

mbar

250/250/250
180/250/250

- / - / -

250/250/250
160/250/250

- /210/250

Specic water throughput D at ∆t = 30 K l/min 8.7 11.7

DHW throughput

2)

(version IT, ES) l/min 2.7-6 (9) 2.7-8 (12)

Minimum ow pressure / for 95% Q

max

2)

bar 0.27 / 0,9 0.27 / 0,9

Max. permissible overall pressure bar 10 10

DHW temperature range * °C 40-60 (65) 40-60 (65)

Expansion vessel
Total capacity
Inlet pressure

l

bar

10

0.75

10

0.75

Flue gas mass ow rate

1)

g/s 12.8 / 13.9 15.0 / 19.0

Flue gas temperature

1)

°C 80 /123 80 /125

Required boiler draught Pa 1.5 1.5

Flue gas group according to DVGW G 635 - -

NOx class 5 5

Flue gas monitoring delay min 15 15

Electrical connection V~/Hz 230/50 230/50

In-built safeguard, connection/circuit board A 3.15 mT 3.15 mT

Power consumption / standby W 83 / 6 83 / 6

Protection IPX 4D IPX 4D

Total weight (dry) kg 39 41

CE ID CE-0085BS0516

1)

Q

B_Min

/ Q

B_Rated

at 80/60 °C at the boiler connection

2)

Applies only to combi boiler versions CGU-2 K and CGG-2 K

* Only use temperatures above 60 °C under controlled conditions, as there is a risk of scalding.

61

3062347_0309

Specication

Type CGG-2(K) 18 CGG-2(K) 24

Rated output kW 18 24

Rated thermal load kW 19.7 26.5

Lowest output (modulating) kW 8.0 10.9

Lowest thermal load (modulating) kW 8.5 11.7

Standard efciency at 75/60 °C (Hi/Hs) % >94/85 >94/85

Outside diameter, heating ow G ¾" ¾"

Outside diameter, heating return G ¾" ¾"

DHW connection (or cylinder connection) G ¾" ¾"

Cold water connection (or cylinder connection) G ¾" ¾"

Gas connection G ¾" ¾"

Balanced ue connection mm 60/100 60/100

Gas supply details:
Natural gas H (Hi = 9.5 kWh/m³ = 34.2 MJ/m³)
LPG P (H

i

= 12.8 kWh/kg = 46.1 MJ/kg)

m3/h

kg/h

2.1

1.5

2.8

2.1

Gas supply pressure:

Natural gas

LPG P

mbar
mbar

20

50

20

50

Flow temperature (setting range) °C 40-90 40-90

Heating water temperature range ( preselected ) °C 40-80 40-80

Max. overall pressure, heating bar 3.0 3.0

Heating water heat exchanger

2)

water content l 0.5 0.5

Residual pump head: Pump stage 1/2/3
430 l/h supply volume (10 KW at

∆t = 20 K) mbar

770 l/h supply volume (18 KW at

∆t = 20 K) mbar

1 030 l/h supply volume (24 KW at

∆t = 20 K) mbar

mbar

250/250/250
180/250/250

- / - / -

250/250/250
160/250/250

- /210/250

Specic throughput D at ∆t = 30 K l/min 8.7 11.7

DHW throughput

2)

(version IT, ES) l/min 2.7 - 6 (9) 2.7 - 8 (12)

Minimum ow pressure / for 95% Q

max

2)

bar 0.27 / 0.9 0.27 / 0.8

Max. permissible overall pressure bar 10 10

DHW temperature range * °C 65 65

Expansion vessel
Total capacity
Inlet pressure

l

bar

10

0.75

10

0.75

Flue gas mass ow rate

1)

g/s 6.8 / 8.5 10 / 13.2

Flue gas temperature

1)

°C 100 / 160 100 / 170

Required boiler draught Pa 0 0

Flue gas group according to DVGW G 635 G01 G01

Flue gas monitoring delay min - -

Electrical connection V~/Hz 230/50 230/50

In-built safeguard, connection/circuit board A 3.15 mT 3.15 mT

Power consumption / standby W 120 / 6 120 / 6

Protection IPX 4D IPX 4D

Total weight (dry) kg 42 43.5

CE ID CE-0085BT0420

1)

Q

B_Min

/ Q

B_Rated

at 80/60 °C at the boiler connection

2)

Applies only to combi boiler versions CGU-2 K and CGG-2 K

* Only use temperatures above 60 °C under controlled conditions, as there is a risk of scalding.

62

3062347_0309

Troubleshooting

Any faults will be displayed as fault code by Wolf controllers with eBUS capability. To these faults, cause and remedy may be
allocated using the following table. This table is designed to allow your local heating contractor to trace the fault more easily.

Fault

code

Fault Cause Remedy

1 TBV excess

temperature

The ow temperature has exceeded the limit for

the TBV shutdown temperature.

Heat exchanger severely contaminated.

Check the system pressure. Check the heating

circuit pump. Check the HC pump step switch.

Vent the heating system. Press reset button.

Clean the heat exchanger.

4 No ame established No ame established during the burner start. Check the gas supply line and open the gas valve,

if necessary.

Check the ignition electrode and ignition cable.

Press the reset button.

5 Flame failure during

operation

Flame failure during
ame stabilisation or soft start.

Check CO2 Values. Check ionisation electrode and

cable.

6 TW excess temperature The ow/return temperature has exceeded the

limit for the TW shut-down temperature.

Check the system pressure. Vent the system.

Set the pump to stage 2 or 3.

7 TBA excess

temperature

Maximum ue gas temperature exceeded. Clean burner, check gas pressures

8 Flue gas damper does

not activate

Flue gas damper or its feedback faulty. Check lead.

Replace ue gas damper.
Check bridges in junction box.

10 Flow sensor 2 faulty Sensor 2 for the ow temperature or

the lead is faulty.

Check lead.

Check/replace ow temperature 2.

11 Flame pretence A ame is recognised before the

burner starts.

Check the ionisation.

Press the reset button.

12 Flow sensor 1 faulty Sensor 1 for the ow temperature or

the lead is faulty.

Check lead.

Check/replace ow temperature 1.

14 Cylinder sensor faulty DHW temperature sensor or lead faulty. Check lead.

Check/replace cylinder sensor.

15 Outside temperature

sensor faulty

The sensor for the outside temperature or

the lead is faulty.

Check lead.

Check/replace outside temperature sensor

22 Lack of air Differential pressure switch will not switch ON. Press the reset button; check the silicone hoses

to the differential pressure switch. Check ue gas

system and gas fan.

Check the differential pressure switch.

23 Fault differential

pressure switch

Differential pressure switch does not switch OFF. Press reset button;

replace the differential pressure switch, if required.

25 Gas fan fault The gas fan does not reach the set speed. Press the reset button, check the gas fan lead

cable, check the ue gas fan and replace the gas

fan.

26 Gas fan fault The gas fan does not stop. Press the reset button, check the gas fan lead

cable, check the ue gas fan and replace the gas

fan.

40 System pressure switch

fault

The system pressure switch has responded. Check the system pressure switch.

Check the system pressure.

41 Flow monitoring Flow temperature 1 > ow temperature 2 + 12 K ,

temperature change too great.

Vent the heating system, check the system

pressure.

Check heating circuit pump.

45 Fault sensor

Flow rate

Lead or sensor faulty or not connected. Check the lead and replace the sensor, if required.

46 Fault DHW outlet

temperature

Lead or sensor faulty or not connected. Check the lead and replace the sensor, if required.

52 Max. cylinder heating

time exceeded

The cylinder heating time takes longer than is set. Check drawing rate, check DHW cylinder.

78 Manifold sensor faulty The manifold sensor is outside its permitted range. Check manifold sensor, replace.

(The calculation of the set ow temperature
changes according to the ow sensor).

63

3062347_0309

Sensor resistances

NTC
Sensor resistances

Boiler sensor, cylinder sensor, solar cylinder sensor, outside
temperature sensor, return sensor, ow sensor, manifold sensor

Temp. °C Resist. Ω Temp. °C Resist. Ω Temp. °C Resist. Ω Temp. °C Resist. Ω

-21 51393 14 8233 49 1870 84 552

-20 48487 15 7857 50 1800 85 535

-19 45762 16 7501 51 1733 86 519

-18 43207 17 7162 52 1669 87 503

-17 40810 18 6841 53 1608 88 487

-16 38560 19 6536 54 1549 89 472

-15 36447 20 6247 55 1493 90 458

-14 34463 21 5972 56 1438 91 444

-13 32599 22 5710 57 1387 92 431

-12 30846 23 5461 58 1337 93 418

-11 29198 24 5225 59 1289 94 406

-10 27648 25 5000 60 1244 95 393

-9 26189 26 4786 61 1200 96 382

-8 24816 27 4582 62 1158 97 371

-7 23523 28 4388 63 1117 98 360

-6 22305 29 4204 64 1078 99 349

-5 21157 30 4028 65 1041 100 339

-4 20075 31 3860 66 1005 101 330

-3 19054 32 3701 67 971 102 320

-2 18091 33 3549 68 938 103 311

-1 17183 34 3403 69 906 104 302
0 16325 35 3265 70 876 105 294
1 15515 36 3133 71 846 106 285

2 14750 37 3007 72 818 107 277
3 14027 38 2887 73 791 108 270
4 13344 39 2772 74 765 109 262
5 12697 40 2662 75 740 11 0 255
6 12086 41 2558 76 716 111 248
7 11508 42 2458 77 693 11 2 241
8 10961 43 2362 78 670 11 3 235
9 10442 44 2271 79 670 11 4 228

10 9952 45 2183 80 628 115 222

11 9487 46 2100 81 608 11 6 216
12 9046 47 2020 82 589 117 211
13 8629 48 1944 83 570 118 205

64

3062347_0309

Notes

65

3062347_0309

A

Adjusting the ue lengths CGG-2(K) ............................................................................................................ 39

Adjusting the gas type .................................................................................................................................. 35

Anti-seizing pump protection ........................................................................................................................ 21

B

Balanced ue system (LAF) horizontal CGG-2(K)........................................................................................ 46

Balanced ue system (LAF) vertical CGG-2 (K) ........................................................................................... 47

Boiler certication ......................................................................................................................................... 37

Boiler circuit pump run-on time ..................................................................................................................... 25

Boiler overtemperature during DHW cylinder heating .................................................................................. 30

Burner cycle block ........................................................................................................................................ 26

Burner switching differential .........................................................................................................................23

C

Changing a fuse ...........................................................................................................................................15

Checking and adjusting the nozzle pressure ................................................................................................ 36

Checking the ue gas monitoring CGU-2(K) ................................................................................................ 44

CO2 value in % at CGG2 .............................................................................................................................40

Code scan ....................................................................................................................................................23

Cold water and DHW connection .................................................................................................................13

Commissioning gas connection .................................................................................................................... 33

Commissioning guidelines ............................................................................................................................ 19

Commissioning report................................................................................................................................... 50

Connection of digital Wolf control accessories (e.g. BM, MM, SM1, SM2, KM) ........................................... 17

Contractor level ............................................................................................................................................23

Conversion to other gas types ...................................................................................................................... 34

Cylinder hysteresis ....................................................................................................................................... 29

D

DHW connection versions ............................................................................................................................ 31

DHW cylinder sensor connection .................................................................................................................17

DHW Quick Start .......................................................................................................................................... 26

DHW temperature selector ........................................................................................................................... 20

Diagram - bypass valve ................................................................................................................................ 43

Diagram - limiting the maximum output ........................................................................................................ 41

Dimensions ..................................................................................................................................................... 6

Disposal ........................................................................................................................................................ 49

E

Electrical connection CGG-2 (K) ..................................................................................................................16

Electrical connection CGU-2 (K)................................................................................................................... 15

Emissions test mode ....................................................................................................................................21

Engineering information - balanced ue system........................................................................................... 45

Equipment codes ............................................................................................................................................ 9

External accessories CGG2 ......................................................................................................................... 16

F

Fault history .................................................................................................................................................. 30

Filling the system .......................................................................................................................................... 18

Filling / venting the system ........................................................................................................................... 18

Flue gas damper connection CGU2 ............................................................................................................. 15

Flue gas damper for CGU-2(K) ....................................................................................................................49

Flue gas test CGU-2(K) / CGG-2(K) ............................................................................................................. 40

Frost protection limit ..................................................................................................................................... 23

Keyword index

66

3062347_0309

Keyword index

G

Gas connection............................................................................................................................................. 13

Gas throughput table .................................................................................................................................... 37

Guidelines for commissioning....................................................................................................................... 19

H

Heating water temperature selector .............................................................................................................20

I

Illuminated signal ring as status indicator ..................................................................................................... 20

Input E1 (24 V) connection ........................................................................................................................... 17

Installation dimensions ................................................................................................................................. 10

Installation dimensions with cylinder ............................................................................................................ 11

Installation inside a cupboard ....................................................................................................................... 13

Installation instructions ................................................................................................................................. 10

Installation on nished/unnished walls........................................................................................................ 12

L

LAS and ue chimney e.g. Plewa, Schiedel ................................................................................................. 48

Layout ............................................................................................................................................................. 9

Layout CGG-2(K) 18/24.................................................................................................................................. 8

Layout CGU-2(K) 18/24 .................................................................................................................................. 7

Lower burner output HZ................................................................................................................................ 23

M

Maintenance: Cleaning the DHW heat exchanger .......................................................................................55

Maintenance: Cleaning the gas burner......................................................................................................... 53

Maintenance: Cleaning the heating water heat exchanger ..........................................................................54

Maintenance: Cleaning the strainer in the cold water inlet ........................................................................... 57

Matching the pipe length ..............................................................................................................................23

Max. cylinder heating time ............................................................................................................................ 29

Maximum DHW temperature ........................................................................................................................ 29

Maximum limit, boiler circuit TV - max .......................................................................................................... 25

Minimum boiler water temperature TK-min. .................................................................................................29

N

Notes ............................................................................................................................................................ 64

Nozzle pressures .......................................................................................................................................... 36

Nozzle replacement ...................................................................................................................................... 34

Nozzle size ................................................................................................................................................... 34

Number of nozzles........................................................................................................................................ 34

O

Output A1 (230VAC;200VA) .........................................................................................................................15

Outside temperature sensor connection....................................................................................................... 17

67

3062347_0309

Keyword index

P

Parameter overview / setting report.............................................................................................................. 22

Programmable input E1 ................................................................................................................................ 27

Programmable output A1 .............................................................................................................................. 28

Pump operating mode / boiler pump ............................................................................................................24

R

Readjust the gas valve ................................................................................................................................. 38

Replacing expansion vessel ......................................................................................................................... 56

Reset ...................................................................................................................................................... 20, 31

S

Safety instructions .......................................................................................................................................... 3

Selecting the pump stage ............................................................................................................................. 42

Sensor resistances ....................................................................................................................................... 63

Service report ............................................................................................................................................... 51

Setting the eBUS address for cascade mode............................................................................................... 32

Sound insulation ........................................................................................................................................... 10

Specication CGG-2(K) 18/24 ...................................................................................................................... 61

Specication CGU-2(K) 18/24 ...................................................................................................................... 60

Standards and regulations.............................................................................................................................. 5

Summer mode .............................................................................................................................................. 21

T

Terminal box .................................................................................................................................................14

Troubleshooting ............................................................................................................................................ 62

U

Upper burner output HZ................................................................................................................................ 24

Upper burner output WW.............................................................................................................................. 24

V

Venting and lling the system ....................................................................................................................... 18

W

Winter mode ................................................................................................................................................. 21

Wiring diagram CGG-2(K) ............................................................................................................................ 59

Wiring diagram CGU-2(K) ............................................................................................................................58

Dr. Fritz Hille

Engineering Director

Gerdewan Jacobs

Technical Manager

EC declaration of conformity

We hereby certify that the Wolf gas red wall mounted boilers and the Wolf gas red freestanding boilers
comply with the type-tested sample described in the EC type-testing certicate, and that they meet the
requirements specied by the Gas Equipment Directive 90/396/EEC dated the 29.06.1990.

EC Declaration of Conformity

We herewith declare, that Wolf-wall-mounted gas appliances as well as Wolf gas boilers correspond to the
type described in the EC-Type Examination Certicate, and that they full the valid requirements according
to the Gas Appliance Directive 90/396/EEC dd. 1990/06/29.

Déclaration de conformité au modèle type CE

Ci-joint, nous conrmons, que les chaudières murales à gaz Wolf et les chaudières a gaz Wolf sont conformes
aux modèles type CE, et qu’elles correspondent aux exigences fondamentales en vigueur de la directive
du 29-06-1990 par rapport aux installations alimentées de gaz (90/396/CEE).

Dichiarazione di conformita campione di costruzione - EG

Con la presente dichiariamo che le nostre caldaie Murali a Gas Wolf e le caldaie a Gas Wolf corrispondono
al e campioni di costruzione, come sono descritte nel certicato di collaudo EG "campione di costruzione"
e che esse soddisfano le disposizioni in vigore nella normativa: 90/396/EWG apparecchiature a Gas.

EG-konformiteitsverklaring

Hierbij verklaren wij dat de Wolf gaswandketels alsmede de Wolf atmosferische staande gasketels
gelijkwaardig zijn aan het model, zoals omschreven in het EG-keuringscerticaat, en dat deze aan de van
toepassing zijnde eisen van de EG-richtlijn 90/396/EWG (Gastoestellen) d. d. 29.06.90 Voldoen.

Declaración a la conformidad del tipo - CE

Por la presente declaramos que las calderas murales Wolf al igual que las calderas atmosfericas a gas
corresponden a la certicacion CE y cumplen la directiva de gas 90/396/CEE del 29.06.1990.

Wolf GmbH

Industriestraße 1
D-84048 Mainburg