Wolf ComfortLine CNK, FunctionLine Series, ComfortLine CNK-CB, ComfortLine CNU, ComfortLine CNU-CB Installation And Maintenance Instructions Manual
...
Installation and
maintenance instructions
ComfortLine
FunctionLine
Steel boilers up to 63 kW
Technology serving Mankind
Wolf GmbH · Postfach 1380 · 84048 Mainburg · Tel. +49 8751/74-0 · Fax +49 8751/741600 · Internet: www.wolf-heiztechnik.de
12/03 TV GB
Part.-No. 30 60 917 Subject to modifications
2
Index
Index .............................................................................................................................. Page
Reference symbols / Safety instructions ............................................................................................3
Standards / Regulations ..................................................................................................................... 4-5
ComfortLine steel boilers ........................................................................................................................6
FunctionLine steel boilers ......................................................................................................................7
Installation ............................................................................................................................................ 8-9
Boiler installation on a plinth .............................................................................................................10
Boiler installation on a horizontal DHW cylinder...........................................................................11
Boiler assembly ...............................................................................................................................12-15
ComfortLine decorative panel installation................................................................................ 16-17
FunctionLine decorative panel installation.....................................................................................18
Flue pipe installation ............................................................................................................................19
Central heating boiler connections................................................................................................... 20
DHW cylinder to boiler pipework ....................................................................................................... 21
Filling the heating system............................................................................................................22-23
Draining the heating system .............................................................................................................. 24
Pressure jet oil burner installation / electrical supply .................................................................. 25
Initial start-up ........................................................................................................................................ 26
Commissioning report ..........................................................................................................................27
Maintenance ...................................................................................................................................28-29
Maintenance log............................................................................................................................. 30-31
Specification....................................................................................................................................32-33
Dimensions ......................................................................................................................................34-35
Troubleshooting .....................................................................................................................................36
3
Reference symbols / Safety instructions
The following symbols are used in conjunction
with these important instructions concerning
personal safety and technical reliability.
"Safety instructions" are
instructions with which you
must comply exactly, to prevent
injury and material losses.
Danger through "live" electrical
components.
Please note: Switch OFF the ON/
OFF switch before removing the
casing.
Never touch electrical
components or contacts when
the switch is in the ON position.
This creates a risk of
electrocution, which may cause
injury or death.
The main supply terminals are
"live" even when the ON/OFF
switch is in the OFF position.
This indicates technical
instructions which you must
observe to prevent material losses
and boiler malfunctions.
In addition to the installation instructions,
operating instructions and adhesive labels
are included or fitted to the boiler. These
must also be observed.
Note
General
Authorised personnel should read these
instructions before any installation,
commissioning or maintenance work.
Adhere to the instructions given in this
document.
Non-observance of these installation
instructions voids any guarantee offered by
WOLF.
Safety instructions
• Only use qualified and trained personnel
for the installation, commissioning and
maintenance of the boiler .
• In accordance with DIN EN 50110-1, work
on electrical components (e.g. control units)
may only be carried out by qualified
electricians.
• The regulations of VDE/ÖVE and those of
your local electricity supplier as well as all
other local regulations are applicable to
electrical installation work.
• Only operate the boiler within its output
range which is stated in the specification
supplied by WOLF .
• Appropriate use of the boiler refers to the
exclusive use for hot water heating systems
in accordance with DIN 4751.
• Never remove, bypass or otherwise disable any
safety and monitoring equipment.
• The boiler may only be operated in perfect
technical condition. Any faults and damage
which may impact on safety which might
limit the safe use of the equipment must be
remedied immediately by a qualified
contractor.
• Only replace faulty components or
equipment with original WOLF spare parts.
4
Standards / Regulations
Standards and regulations
Observe all current Building Regulations and
other local requirements.
Only recognised heating contractors may install
WOLF boilers. This heating contractor will also
be responsible for the proper installation and
the commissioning of the heating system.
The boilers described in these installation
instructions are low temperature boilers
according to HeizAnlV and 92/42/EEC
(Efficiency of Hot Water Boilers).
Locate the enclosed operating instructions in a
clearly visible position in the boiler room.
Boilers may only be installed and operated in
boiler rooms which are suitable according to
the Landes-FeuVo [or local regulations].
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.
• Energy Savings Act (EnEG) and related
directives (Heating Systems Order).
• DIN standards
DIN 1988 Technical rules for DHW
installations
DIN 4701 Rules for calculating the heat
demand of buildings
DIN 4751 Part 3 - Safety Equipment
for heating systems with flow
temperatures up to 95 °C
DIN 18160 Domestic chimneys
• VDE requirements:
VDE 0100 General information
regarding the installation of
HV systems with rated
voltages up to 1000V
VDE 0105 Operation of HV systems,
general considerations
VDE 0722 Electrical equipment of
non-electrically heated
heat generators
VDE 0470/ Protection through housings
EN 60529
EN 60335-1 Safety of electrical
equipment for domestic use
and similar purposes
Note: Please read these instructions
carefully before the installation and
keep them in a safe place.
5
Steel boilers
according to DIN EN 303 as well as in accordance with EC Directive 90/396/EEC (gas consuming
equipment), 73/23/EEC (Low Voltage Directive), 89/336/EEC (EMC Directive), 92/42/EEC (Efficiency of
Hot Water Boilers) and 93/68/EEC (Identification Directive) for heating systems with heating circuit
pumps and flow temperatures up to 110 °C and 3 bar permissible operating pressure in accordance
with DIN 4751 and DHW cylinder pressure (max. 10 bar) in accordance with DIN 4753.
For the operation with pressure jet gas burners, the following gas device categories apply:
Standards / Regulations
Country abbreviation Country Gas device category
DE Germany II
2ELL3B/P
AT Austria II
2H3B/P
LU Luxembourg I2E or I
3+
The NOx limits required by the 1st BImSchV para. 7(2) are maintained.
6
ComfortLine steel boilers
Oil and gas-fired steel boiler, type CNK
(boiler plinth, accessory)
Oil and gas-fired steel boiler, type CNK-CB
incl. DHW cylinder
Oil and gas-fired steel boiler, type CNU
incl. pressure jet oil burner
(boiler plinth, accessory)
Oil-fired steel Unit boiler, type CNU-CB
incl. DHW cylinder
and pressure jet oil burner
7
Oil and gas-fired steel boilers, type FNK
(boiler plinth, accessory)
Oil and gas-fired steel boiler, type FNK-FB/FE
incl. DHW cylinder
Oil-fired steel Unit boiler, type FNU
incl. pressure jet oil burner
(boiler plinth, accessory)
Oil-fired steel Unit boiler, type FNU-FB/FE
incl. DHW cylinder
and pressure jet oil burner
FunctionLine steel boilers
8
Installation
The ventilation air supply must be
ensured and comply with local
regulations or those relating to
gas installations. We recommend
that you supply the boiler with
fresh air directly from the outside.
An insufficient fresh air supply
can lead to fuel gas escaping,
which represents a risk to life
(poisoning/suffocation).
Clearances towards walls and
combustible materials must comply
with local fire regulations, and
should be at least 200mm,
otherwise there is a high risk of
fire.
General tips regarding location
• Install the boiler with or without the DHW
cylinder on a level surface which is substantial
enough to carry its weight.
• Position the boiler and DHW cylinder (if
installed) horizontally or slightly rising
towards the back to ensure adequate venting
of any trapped air (level with adjustable
feet).
Only install the boiler and DHW
cylinder (if installed) in a room safe
from the risk of frost.
Drain the boiler, the DHW cylinder
and the entire heating system if
there is a risk of frost, when the
system has been shutdown, to
prevent pipes from bursting.
Boilers should not be installed in
areas subject to aggressive vapours,
very dusty or highly humid
conditions (workshops, washrooms,
hobby rooms etc.). This prevents the
optimum burner function from
being achieved.
The combustion air supplied to the
pressure jet oil burner must be free
from halogenated hydrocarbons
(e.g. as contained in sprays,
solvents, cleaning fluids, paints
and adhesives). Under the most
unfavourable conditions, these
may lead to pitting of the boiler
and even the flue gas system.
Never store or use combustible
material or liquids near the boiler.
Note
Note
9
1000
900
400
Installation
Transportation into the boiler room
To ease the transportation into the boiler
room, lifting slings with lifting hooks are offered
as accessories.
Only lift the boiler using all four
lifting slings.
Lifting eyes for lifting slings
Recommended minimum wall clearance
Note
Boiler installation on adjustable feet
At the factory the boiler is equipped with four
adjustable feet.
• Level the boiler with adjustable feet
(accessory) horizontally or with a slight
incline to the rear.
Adjustable
bolt
Feet
(accessory)
Adjustable bolt/ feet
Recommended minimum wall clearance
Maintain a minimum clearance between the
boiler sides and walls of 400 mm to enable the
boiler door with fitted burner to be opened.
Ensure that sufficient space is available for
cleaning and maintenance.
10
Boiler
Thermal insulation, boiler
Thermal insulation, boiler back
Thermal insulation, boiler front
Side casing
Control unit bracket
Boiler door
Back wall casing
Boiler installation on a plinth
2
3
4
5
Control unit housing
Casing cover
Spring shackles
Front casing
Type plate
Wolf logo
Plinth (accessory)
6
8
9
10
11
12
13
1
7
14
15
2
6
9
1
5 5
3
14
15
13
13
7
10
11 11
12
4
8
11
2
6
9
1
5 5
3
14
15
13
13
7
10
11 11
12
4
8
Boiler installation on a horizontal DHW cylinder
Boiler
Thermal insulation, boiler
Thermal insulation, boiler back
Thermal insulation, boiler front
Side casing
Control unit bracket
Boiler door
Back wall casing
2
3
4
5
Control unit housing
Casing cover
Spring shackles
Front casing
Type plate
Wolf logo
Horizontal DHW cylinder
6
8
9
10
11
12
13
1
7
14
15
12
Boiler assembly
2
Position the thermal insulation for the
boiler back
over the rear connections and on the
back wall of the boiler.
3
Position the thermal insulation for the
boiler front
loosely on the boiler
4
Screws for securing the boiler
Screws for securing the boiler to the plinth
1
Boiler
• Install the plinth or the DHW cylinder
in accordance with the enclosed
installation instructions.
• Position the boiler with adjustable
bolts fully inserted using the
lifting slings on the fully assembled
plinth or DHW cylinder.
• To secure the boiler to the plinth or
DHW cylinder, tapped holes are
provided at the front sides of the
boiler. Additional fixings are not
required.
• Check the horizontal level of the
boiler together with the plinth and
DHW cylinder and adjust, with a slight
incline to the rear, if necessary.
Screws for securing the boiler
Fixing screws on the DHW cylinder
Position the thermal boiler insulation
around the boiler (overlapping) and secure
with spring clips.
13
Boiler assembly
Locate the control unit bracket
centrally and push parallel forward,
until both recesses in the side casing
click into the control unit bracket tabs.
Secure the control unit bracket and side
casing with the self-tapping screws
supplied (6 no.).
Control unit bracket
Side casing
Hooks
Control unit bracket installation
Self-tapping screws
Side casing fixing screws
6
Boiler notch
Lower folded edge
of the side casing
View X
Side casing installation
and fit the lower folded edge into both
notches (view X).
Insert the side casing
into the boiler front pushing the spring
shackles behind the boiler bracket
5
Side casing installation
Spring shackle
Bracket
11
14
Boiler assembly
Fit the boiler door
with the four M10x45 screws and
washers supplied.
Insert the door hinge pins into the door
bracket on the l.h. or r.h. side, subject to
door opening.
7
Door
hinge pin
Boiler door installation
M10x45 screws
Back wall notches
Rear wall installation
Self-tapping screws
Hook the back wall casing
with tabs into the notches in the side
casing, and secure with the self-tapping
screws (4 no.) supplied.
8
Locking tabs
Control unit bracket
Secure tightly
Control unit housing installation
9
Push the control unit housing
with locking tabs into the apertures in
the control unit bracket and pull forward
to its end stop. Secure the control unit
housing with the two self-tapping screws
supplied to the control unit at the l.h. and
r.h. rear, working from top to bottom.
Route the boiler sensor to the rear and
push into the sensor well in any
arrangement, then secure with the circlip.
15
Boiler assembly
Cable clip
Cover cap
Burner cable holder
13
Affix the type plate
in a clearly visible position.
Clip the Wolf logo
into the front casing
(only for FunctionLine).
14
Position the casing cover
onto both side casings and push towards
the control unit bracket.
10
Type plate / Wolf logo
Type plate
Wolf logo
12
11
Front casing installation
Guide the burner cable through the
aperture in the control unit bracket
(l.h. or r.h. subject to boiler door opening).
Clip a cover cap into the control unit
bracket to protect the burner cable.
Secure the cable clip with the burner cable
at the l.h. or r.h. side (bottom) of the boiler.
9
Push the front casing
with open control unit lid with the
profile screws against the spring
shackles , until they click into place.
16
ComfortLine decorative panel installation
In addition, all ComfortLine boilers require the
following work to be undertaken.
Decorative panel
Position the decorative panel with the document
wallet on the holes and push against the front
casing, until the clips click into place.
Decorative frame
(CNK 17-60 single boiler)
Click the plastic clips (4 no., black) into the
front casing. Position the decorative frame
onto the clips and push down to their end stop.
Decorative panel installation, single boiler
Decorative panel installation
17
Large silencer hood installation
Large silencer hood
(CNU 40-63 Unit boiler)
Click the plastic clips (4 no., orange) into
the front casing. Position the large silencer
hood onto the clips and push down to their end
stop.
ComfortLine decorative panel installation
Decorative frame
(CNU 17-32 Unit boiler)
With the dome at the top, push the silencer hood
into the decorative frame, then secure the
silencer hood with four self-tapping screws
from the inside to the decorative frame.
Self-tapping
screws
Joining the decorative frame and the
silencer hood
Silencer hood
Decorative frame
Decorative panel installation, Unit boiler
Click both top plastic clips (black) from the
outside into the front casing. Click both lower
plastic clips (black) from the inside into the
front casing. Hook the decorative frame with
the silencer hood into the top clips and secure
in the lower plastic clips.
18
FunctionLine decorative panel installation
For models FNU-TH/17/20/25, the following
additional work should be undertaken.
Decorative panel
Click the plastic clips (4 no., grey) into the
front casing.
Decorative panel installation
Decorative panel
19
Flue pipe installation
Flue pipe outlet
Clean-out covers
Clean-out covers
in flue pipe elbows
• The flue pipe cross-section must match that
of the boiler flue outlet.
• Reducing the flue pipe size is only permitted,
if the satisfactory function has been
verified (by calculation) in accordance with
DIN 4705.
Keep the flue pipe as short as
possible and inclined towards
the chimney stack.
• Thoroughly seal in the flue pipe.
• Use flue pipe elbows with clean-out covers
to facilitate the cleaning of the flue pipe.
20
Central heating boiler connections
Central heating boiler connections
Boiler return
Boiler return
Boiler flow Boiler flow
Connection for venting
and safety flow
Sensor well
Filling / Draining
Connect the heating flow and return to the
respective boiler fittings. For connections, see
below.
Install a check valve downstream of the boiler
circuit pump(s) to prevent incorrect circulation.
Install a safety assembly comprising
a safety valve with a response pressure
of 3 bar and an automatic air-vent
valve.The pipework between the
boiler and the safety valve must
not be able to be shut off. Severely
excessive boiler pressure due to
excessive boiler temperature, can
burst the boiler body or the boiler
pipework, which would lead to a
sudden excape of hot water (risk of
scalding).
Connect any underfloor heating
system via a three or four-way
mixer.
Note
Provide system separation by means
of a heat exchanger, when using
pipes which are not impermeable
to oxygen.
This boiler is only suitable for
heating systems with pumped
heating circuits. If no heating circuit
pump has been installed, sufficient
circulation through the radiators
cannot be ensured, putting the
room heating in question.
Recommendation: Convert open
systems into sealed systems.
Return temperature raising facility
Heating systems with large water
volume (above 20 litres per kW
output) require a return temperature
of 30 °C, as otherwise the longer
heat-up time of such systems would
create condensate and run an
increased risk of boiler body
corrosion.
Note
21
Install the pipework between the boiler and the
DHW cylinder in accordance with the
illustration below.
The DHW cylinder loading
pump must supply from the
top to bottom.
Close any boiler flow and return connections
which are not required with caps and gaskets
supplied.
DHW cylinder to boiler pipework
Cylinder loading pump
incl. gaskets
Ferrule with
union nut
Gravity brake
Boiler return 2 x
Hoses with gaskets
Boiler flow 2x
Sensor well for DHW
cylinder sensor
Cold water inlet
Elbows
DHW circulation
DHW outlet
Note
DHW cylinder to boiler pipework
22
Fill the system and vent it properly to safeguard
the perfect boiler function.
Before connecting the boiler to the
heating system, flush the entire
system to remove residues such as
welding pearls, hemp, putty, etc.
from the pipework.
The boiler and central heating
system may only be filled, if a typetested safety valve (opening
pressure max. 3 bar) has been
installed.
• Connect a water hose to the filling/drain
valve (on-site).
• Open the cap of the quick-action air-vent
valve of the safety assembly (accessory) by
one revolution, but do not remove the cap.
• With the boiler in a cold condition, fill the
heating system slowly via the fill and drain
valve, until 1 bar pressure is indicated.
Inhibitors are not permissible.
Filling the heating system
Filling the heating system
Connection for venting
and safety flow
Filling
Note
Boiler fill and drain valve
Hose connection
Automatic air-vent valve
Locking cap
Automatic air-vent
valve
Note
23
• Observe the pressure gauge of the safety
equipment assembly when filling the system
with water.
• For boilers with DHW cylinder, vent the
heating coil at a system pressure of
approximately 0.50 bar or less by starting
the DHW cylinder loading pump (operating
time approximately 2 minutes).
• Check the entire system for water leaks.
• Check the safety valve function.
• Ventilate the boiler (e.g. via an automatic
air-vent valve).
• Fill the system to 1 bar pressure.
In operation, the pressure gauge must
indicate between 1 and 2.5 bar.
• Top up with water when the system pressure
falls severely.
• In constant mode, the boiler automatically
vents via the air-vent valve.
Filling the heating system
Safety assembly pressure gauge
Pressure gauge
24
Draining the heating system
Boiler fill and drain valve
Hose connection
• Switch OFF the heating system (see operating
instructions) and let it cool down to a
maximum of 40 °C, to prevent the risk of
scalding.
• Open the drain tap on the boiler.
• Open the radiator bleed valves.
• Drain the heating water off.
Draining the heating system
Connection for venting
and safety flow
Drain
25
Pressure jet oil burner installation / Electrical supply
Electrical supply
Do not route sensor leads with
230 V mains cables.
Connect the heating circuit pump(s) and the
DHW cylinder loading pump(s) on-site via
contactor, if:
• The burner and pump draw more than 2 A
each.
• The total control unit power consumption is
exceeded.
Observe the control unit installation and
operating instructions.
Note
Electrical supply
Cable grommets
Pressure jet oil burner installation
The Unit pressure jet oil burner installation
instructions are included in the burner
packaging.
Only use bolts when securing the
burner to the boiler flange, whose
thread penetrates the boiler flange
by a maximum of 15 mm. Only use
pressure jet gas burners compliant
with EC Directive 90/396/EEC.
Boiler flange
Burner flange holes
Burner plug wiring diagram
26
Initial start-up
Only qualified personnel may
carry out the commissioning and
operation of the boiler and the
instruction of the user.
• Check the boiler and system for leaks.
Close the water outlet - risk of overheating
and scalding.
• Check that all flue gas accessories have
been correctly installed.
• Open the shut-off valves on flow and return.
• Switch ON the system ON/OFF switch on the
control unit.
Note:
When the heating system is started, the
display of the weather-compensated control
unit indicates all superfluous (not connected)
sensors as fault messages.
For removing these fault messages see the
control unit operating instructions.
• If the system water pressure falls below
1.0 bar, top up with water until a pressure
of 1.0 to max. 2.5 bar has been achieved.
• An error code will flash in the display, if the
boiler/burner fails to start properly. For
details about error codes see the quickstart operating instructions.
• Instruct the customer in the operation of
the boiler. Complete the commissioning log
and hand over the instructions.
• Position the operating instructions in the
boiler room where they are clearly visible.
Saving energy
• Instruct the customer about energy-savings
options.
• Use this opportunity for reducing the heating
temperature night operation using control
accessories.
• Adjust the temperature so you are
comfortable; every degree of room
temperature reduction will achieve energy
savings of up to 5%.
• Reduce the room temperature in unoccupied
rooms as far as possible; please observe frost
protection.
• Ensure that all thermostatic radiator valves
are fully opened in rooms where room
thermostats are installed.
The room thermostat must not be obstructed
by furniture or curtains.
Function checks
• During commissioning, check all control,
regulating and safety equipment for their
correct function and settings.
27
1.) Water connections checked for leaks?
2.) Vented boiler and system?
3.) System pressure 1 - 2.5 bar?
4.) Function test carried out?
5.) Flue gas test:
Gross flue gas temperature tA [°C]
Ventilation air temperature tL [°C]
Net flue gas temperature (tA - tL ) [°C]
Carbon dioxide content (CO2) or oxygen content (O2)%
Carbon monoxide content (CO), free of air ppm
6.) Casing fitted?
7.) System user trained, technical documents handed over?
8.) Confirm commissioning
Commissioning steps
Test values and
confirmation
Commissioning report
28
Maintenance
Note:
To ensure the reliable and safe function of a
heating system, users are required to have it
checked and cleaned on an annual basis by an
approved heating contractor (check local
regulations). Switch OFF the boiler when
cleaning the boiler room.
We would recommend a maintenance
contract.
• Pull the burner plug.
• Release the boiler door screws.
Boiler door screws
Front casing
Front casing removal
Boiler door removal
• Switch OFF the heating system (see
operating instructions) and let it cool down.
• Remove the front casing from the boiler.
29
Maintenance
• Assemble in reverse order.
• Remove soot/sulphur deposits with the
cleaning brush supplied.
Cleaning using the cleaning brush
• Open the boiler door.
• Pull out the turbulators (only for CNK-40/
FNK-40 and CNK-63/FNK-63).
Turbulators
Turbulator
• Pull out the hot combustion chamber.
Hot combustion chamber
30
Maintenance log
• Please tick the maintenance steps carried
out and enter the test values into this log.
Maintenance steps Date Date
1. Cleaned the boiler?
2. Leak test carried out during operation?
3. Function test carried out?
4. Flue gas test:
Gross flue gas temperature tA [°C] tA [°C]
Ventilation air temperature tL [°C] tL [°C]
Net flue gas temperature (tA - tL ) [°C] (tA - tL ) [°C]
Carbon dioxide content (CO2) or % %
Oxygen content (O2)%%
Carbon monoxide content (CO), free of air ppm ppm
5. Confirm maintenance
(company stamp, signature)
31
Maintenance log
Date
tA [°C]
tL [°C]
(tA - tL ) [°C]
%
%
ppm
Date
tA [°C]
tL [°C]
(tA - tL ) [°C]
%
%
ppm
Date
tA [°C]
tL [°C]
(tA - tL ) [°C]
%
%
ppm
Date
tA [°C]
tL [°C]
(tA - tL ) [°C]
%
%
ppm
32
Specification
* Values for upper/lower boiler output, relative to a CO2 content of 13% (fuel oil EL) and an average
boiler water temperature of 60 °C. The chimney stack dimensions must be calculated in accordance
with DIN 4705. For flue gas temperatures below 160 °C, connect the boiler to highly insulated
chimney stacks (heat conductivity resistance class I acc. to DIN 18160 T1) or suitable,
moisture-resistant flue gas systems, which have been type-approved.
CNK / FNK / CNU-Premio / CNU-TH / FNU-TH 17 20 25
CNK-CB / FNK-FB / CNU-Premio-CB
17/155 20/155 25/155
CNU-TH-CB / FNU-TH-FB
FNK-FE / FNU-TH-FE 17/155 20/155 25/155
Output range without burner kW 14-17 17-20 20-25
incl. Premio burner kW 14-17 17-20 20-25
incl. TH burner kW 14-17 17-20 20-25
Set-up burner output kW 16 19 23
DHW cylinder capacity CB & FB / FE litres 155/150 155/150 155/150
Constant DHW cylinder output CB and FB litres/h 410 490 615
FE litres/h 410 490 615
Performance factor CB and FB NL
60 2.7 2.8 3.0
FE NL
60 2.7 2.8 3.0
Boiler water capacity litres 51 51 58
Boiler gas content litres 36 36 41
Heating water pressure drop (at
∆∆
∆∆
∆T=20K) mbar 6 6 6
Max. permissible boiler pressure bar 3 3 3
Max. permissible DHW cylinder pressure bar 10 10 10
Rel. standby losses Boiler % 1.8 1.6 1.2
Boiler+DHW cyl. % 2.5 2.2 1.8
Required boiler draught Pa 2 3 5
Flue gas temperature* ° C 160/180 160/180 150/170
Flue gas mass flow rate* kg/h 24/29 29/34 34/42
Boiler flow G 1½" 1½" 1½"
Boiler, safety return G 1½" 1½" 1½"
Filling, draining, (male thread) R 1" 1" 1"
Venting, safety flow (male thread) R 1" 1" 1"
Flue pipe diameter mm 129 129 129
Combustion chamber length incl. handle mm 545 545 615
Weight Boiler kg 135 135 141
Burner kg 10 10 10
CHW cylinder CB and FB kg 66 66 66
DHW cylinder FE kg 98 98 98
Electrical supply max. current (ctrl. unit and acc.)
Max. current (in total, excl. pumps)
Switching capacity pumps, mixer, burner
Control unit fuse (max. current)
Optional connection for mixer motors
33
25 32 32 40 50 63
25/200 32/155 32/200 40/200 50/200 63/200
25/200 32/155 32/200 40/200 - -
20-25 28-32 28-32 32-40 40-50 50-63
20-25 28-32 28-32 32-40 40-50 50-60
20-25 28-32 28-32 32-40 40-48 50-63
23 29 29 36 45 55
200 155/150 200 200 200 200
615 780 780 980 1225 1225
615 720 780 930 - -
4.5 3.2 4.8 4.9 5.0 5.0
4.2 3.2 4.4 4.5 - 58 68 68 68 105 105
41 61 61 61 130 130
6 1010102222
333333
10 10 10 10 10 10
1.2 1.1 1.1 0.9 0.9 0.7
2.0 1.4 1.7 1.3 1.4 1.1
555778
150/170 190/200 190/200 170/185 170/190 165/180
34/42 47/54 47/54 54/68 68/85 85/107
1½" 1½" 1½" 1½" 1½" 1½"
1½" 1½" 1½" 1½" 1½" 1½"
1" 1" 1" 1" 1¼" 1¼"
1" 1" 1" 1" 1¼" 1¼"
129 149 149 149 179 179
615 665 665 665 845 845
141 169 169 169 258 258
10 10 10 15.5 15.5 15.5
83 66 83 83 83 83
121 98 121 121 - -
230 V / 50 Hz / 10A
5 VA
15 VA
230 V, 4(2) A each
M 6.3 A
230V, 50Hz, optimum time 4 - 7 minutes
34
C
B
D
A
E
F
2
CNK / FNK / CNU-Premio
17 20 25 32 40 50 63
CNU-TH / FNU-TH
Boiler height A mm 670 670 670 670 670 845 845
Width B mm 660 660 660 660 660 760 760
Length C mm 756 756 826 876 876 1056 1056
Plinth height D mm 280 280 280 280 280 280 280
Overall height incl. control unit E mm 1115 1115 1115 1115 1115 1290 1290
Silencer hood depth F
1
mm 336 336 336 336 345 345 345
Burner hood depth F
2
mm 265 265 265 265 210 235 250
Draining, filling G mm 385 385 385 360 360 364 364
Central heating return H mm 449 449 449 417 417 420 420
Smoke tube connector J mm 607 607 607 607 607 657 657
Central heating flow K mm 775 775 775 807 807 904 904
Exhaustion L mm 828 828 828 853 853 949 949
Heating connections M mm 260 260 260 260 260 300 300
Observe the height of adjustable feet/bolts 20 mm ±10mm.
F
1
C
B
D
A
E
M
G
H
J
K
L
M
G
H
J
K
L
Dimensions
35
C
B
D
A
E
F
2
CNK-CB / FNK-FB / CNU-Premio-CB
17 20 25 32 40 50 63
CNU-TH-CB / FNU-TH-FB
FNK-FE / FNU-TH-FE 17 20 25 32 40 - -
Boiler height A mm 670 670 670 670 670 845 845
Width B mm 660 660 660 660 660 760 760
Length of 155 l DHW cylinder C mm 987 987 987 987 - - Length of 200 l DHW cylinder C mm - - 1262 1262 1262 1262 1262
DHW cylinder height D mm 625 625 625 625 625 625 625
Overall height incl. control unit E mm 1460 1460 1460 1460 1460 1635 1635
Silencer hood depth F
1
mm 336 336 336 336 345 345 345
Burner hood depth F
2
mm 265 265 265 265 210 235 250
Draining, filling G mm 730 730 730 705 705 709 709
Central heating return H mm 794 794 794 762 762 765 765
Smoke tube connector J mm 952 952 952 952 952 1002 1002
Central heating flow K mm 1120 1120 1120 1152 1152 1249 1249
Exhaustion L mm 1173 1173 1173 1198 1198 1294 1294
Heating connections M mm 605 605 605 605 605 645 645
Cold water inlet N mm 90 90 90 90 90 90 90
DHW circulation CB / FB O mm 412 412 412 412 412 412 412
DHW circulation FE O mm 312 312 312 312 312 - DHW connection P mm 534 534 534 534 534 534 534
Observe the height of adjustable feet/bolts 20 mm ±10mm.
F
1
C
B
D
A
E
M
H
N
J
O
K
P
L
G
M
H
N
J
O
K
P
L
G
Dimensions
Fault Cause Remedy
Burner does not start No voltage present Fuse, electrical connections,
or enters a fault state Check the position of the ON/OFF switch
at the control unit and heating sys. emergency stop switch.
Oil tank empty / Fill oil tank /
Gas supply line shut off open gas supply line.
Burner fault Press the reset button at burner control
unit,
(see burner installation instructions).
Safety temperature Press the reset button at the control
cut-out activated unit.
Oil filter clogged Replace oil filter.
Heating circuit pump does System in summer mode Check summer/winter switch position.
not start Heating circuit pump Turn the pump shaft with a screwdriver.
seized up
Heating circuit pump faulty Replace the heating circuit pump.
Cylinder loading pump DHW cylinder thermostat Check the safety thermostat
does not run faulty and replace, if necessary.
Cylinder loading pump Turn the pump shaft with a screwdriver.
seized up
Cylinder loading pump faulty Replace the DHW loading pump.
Heating system operational, Maximum boiler temperature Raise maximum boiler temperature.
but room temperature set too low.
too low
Heat-up takes too long Heating water temperature Raise the temperature
too low (adjust thermostat)
(check at the DHW cylinder
flow, not at the boiler)
Too little heating water Install larger DHW cylinder loading pump
(creates wider spread,
i.e. return temperature too low)
Indirect coil not vented Vent indirect coil with loading pump OFF
Indirect coil scaled up Descale indirect coil
DHW temperature Thermostat switches Adjust thermostat
too low OFF too soon
Return temperature Install larger DHW cylinder loading pump
too low
(e.g. spread too wide)
Troubleshooting
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