Wolf FunctionLine CHK, ComfortLine CHU, FunctionLine CHU, ComfortLine CHU-CB, FunctionLine CHU-CB Installation And Maintenance Instructions Manual

Installation and
maintenance instructions

ComfortLine
FunctionLine

Cast iron boilers up to 60 kW

GBPart.-No. 3060918_1203 Subject to modications

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

2

3060918_1203

Index

Index .......................................................................................................Page

Safety instructions / Reference symbols ......................................................3

Standards / Regulations ............................................................................. 4-5

ComfortLine cast iron boilers ..........................................................................6

FunctionLine cast iron 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 to 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 .......................................................................................... 26-27

Maintenance ........................................................................................... 28-29

Maintenance log ..................................................................................... 30-31

Specication ........................................................................................... 32-33

Dimensions ............................................................................................. 34-35

Troubleshooting ............................................................................................36

33060918_1203

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“ elec-

trical components.
Please note: Switch OFF the
ON/OFF switch before remo­ving the casing.

Never touch electrical com-

ponents 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 in-

structions 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 tted 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
WOLF.

Safety instructions

• Only use qualied 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 qualied 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 specication

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 or monitoring equip-

ment.

• 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 qualied contractor.

• Only replace faulty components or
equipment with original WOLF spare

parts.

4

3060918_1203

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
(Efciency 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 Regu-

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

• Energy Savings Act (EnEG) and related

directives (Heating Systems Order).

Note: Please read these instructions

carefully before the installation
and keep them in a secure place.

• 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 ow

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.

53060918_1203

Standards / Regulations

Cast iron boilers

acc. 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 (Ef­ciency of Hot Water Boilers) and 93/68/EEC (Identication Directive) for heating
systems with heating circuit pumps and ow 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:

The NO

x

limits required by the 1st BImSchV para. 7(2) are maintained.

Country abbreviation Country Gas device category

DE Germany II

2ELL3B/P

AT Austria II

2H3B/P

LU Luxembourg I2E or I

3+

6

3060918_1203

ComfortLine cast iron boilers

Oil and gas-red cast iron boilers, type

CHK

(boiler plinth, accessory)

Oil and gas-red cast iron boilers, type

CHK-CB

incl. DHW cylinder

Oil-red cast iron Unit boiler, type CHU

incl. pressure jet oil burner

(boiler plinth, accessory)

Oil-red cast iron Unit boiler, type CHU-CB

incl. DHW cylinder

and pressure jet oil burner

73060918_1203

FunctionLine cast iron boilers

Oil and gas-red cast iron boilers, type FHK

(boiler plinth, accessory)

Oil and gas-red cast iron boilers, type

FNK-FB/FE incl. DHW cylinder

Oil-red cast iron Unit boiler, type FHU

incl. pressure jet oil burner

(boiler plinth, accessory)

Oil-red cast iron Unit boiler, type FHU-FB/FE

incl. DHW cylinder

and pressure jet oil burner

8

3060918_1203

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 insufcient 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 re regula­tions, and should be at least
200mm, otherwise there is a
high risk of re.

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

uids, paints and adhesives).

Under the most unfavourable
conditions, these may lead to
pitting of the boiler and even

the ue gas system.

Never store or use combustible

material or liquids near the

boiler.

Note

Note

93060918_1203

Installation

Recommended minimum wall
clearance

Maintain a minimum clearance between
the boiler sides and walls of 400 mm to

enable the boiler door with tted burner

to be opened.

Ensure that sufcient space is available

for cleaning and maintenance.

1000

900

400

Recommended minimum wall clearance

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.

Note

Lifting eyes for lifting slings

Boiler installation on adjustable feet

At the factory the boiler is equipped with

four adjustable bolts

• Level the boiler with adjustable feet

(accessory) horizontally or with a slight
incline to the rear.

Feet

(accessory)

Adjustable

bolt

Adjustable bolt/ feet

10

3060918_1203

15

11 11

4

8

10

6 6

3

5

7

2

1

13

13

14

12

9

Boiler installation on a plinth

Boiler

Boiler door

Thermal insulation, boiler

Thermal insulation, boiler back

Thermal insulation, boiler front

Side casing

Control unit bracket

Back wall casing

Control unit housing

Casing cover

Spring shackles

Front casing

Type plate

Wolf logo

Plinth (accessory)

113060918_1203

15

11 11

4

8

10

6 6

3

5

7

2

1

13

13

14

12

9

Boiler installation on a horizontal
DHW cylinder

Boiler

Boiler door

Thermal insulation, boiler

Thermal insulation, boiler back

Thermal insulation, boiler front

Side casing

Control unit bracket

Back wall casing

Control unit housing

Casing cover

Spring shackles

Front casing

Type plate

Wolf logo

Horizontal DHW cylinder

12

3060918_1203

Boiler assembly

Boiler

• Install the plinth or the DHW

cylinder in accordance with the
enclosed installation instructions.

• Position the boiler with adjustab-

le 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 xings 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

Screws for securing the boiler to the plinth

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.

Position the thermal boiler insula­tion for the boiler back over the rear

connections and on the back wall of
the boiler.

Secure 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.

Boiler door installation

M10x45 screws

133060918_1203

Boiler assembly

Fixing plugs

Thermal insulation, boiler front

Thermal insulation, boiler front

Position the thermal insulation
loosely at the boiler front

and secure with xing plugs (4 no.).

Control unit bracket

Side casing

Hooks

Control unit bracket installation

Locate the control unit bracket

centrally and push parallel forward,
until both recesses in the side casing
click into the control unit bracket tabs.

and t the lower folded edge into

both notches of the boiler (view X).

Boiler notch

Lower folded edge of the side casing

View X

Side casing installation

Side casing

into the boiler front pushing the spring

clip

behind the boiler bracket

Side casing installation

Spring shackle

Bracket

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3060918_1203

Boiler assembly

Locking tabs

Control unit bracket

Secure tightly

Control unit housing installation

Push the control unit housing

with locking tabs into the apertures
on 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 front
and push into the sensor well in
any arrangement, then secure with
the circlip.

Rear wall installation

Back wall notches

Self-tapping screws

Locate the back wall casing

with tabs into the notches in the
side casing, and secure with the
self-tapping screws (4 no.) supplied.

Side casing xing screws

Self-tapping screws

Secure the control unit bracket and
side casing with the self-tapping
screws supplied (6 no.).

153060918_1203

Boiler assembly

Afx the type plate

in a clearly visible position.

Clip the Wolf logo

into the front casing
(only for FunctionLine).

Type plate / Wolf logo

Type plate

Wolf logo

Push the front casing

with open control unit lid with the

prole screws against the spring
shackles

, until they click into

place.

Front casing installation

Position the casing cover

onto both side casings and push
towards the control unit bracket.

Cable clip

Cover cap

Burner cable holder

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.

16

3060918_1203

In addition, all ComfortLine boilers require

the following work to be undertaken.

ComfortLine decorative
panel installation

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 panel installation

Decorative panel installation, single boiler

Decorative frame

(CHK 22-60 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.

173060918_1203

ComfortLine decorative panel installation

Decorative frame

(CHU 22-29 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

Silencer hood

Decorative frame

Joining the decorative frame and the
silencer hood

Large silencer hood installation

Large silencer hood

(CNU 37-60 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.

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.

Decorative panel installation, Unit boiler

18

3060918_1203

FunctionLine decorative
panel installation

For models FHU-TH/22/29, 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

193060918_1203

Flue pipe installation

Flue pipe silencer (accessory)

Install the ue pipe silencer with ue pipe
extension in accordance with the gure

shown.

Flue pipe
extension

Flue pipe
silencer

Flue pipe extension/silencer

Flue pipe outlet

Clean-out covers

Clean-out covers

in ue pipe elbows

• The ue pipe cross-section must match
that of the boiler ue outlet.

• Reducing the ue pipe size is only

permitted, if the satisfactory function

has been veried (by calculation) in

accordance with DIN 4705.

Keep the ue pipe as short as

possible and inclined towards
the chimney stack.

• Thoroughly seal in the ue pipe.

• Use ue pipe elbows with clean-out

covers to facilitate the cleaning of the

ue pipe.

20

3060918_1203

Central heating boiler connections

Central heating boiler connections

Boiler return

Connection for venting

and safety ow

Filling / Draining

Boiler return

Connect the heating ow and return to the
respective boiler ttings. 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 temperatures,
can burst the boiler body or the
boiler pipework, which would
lead to a sudden excape of hot
water (risk of scalding).

Connect any underoor heating

system via a three or four-way
mixer.

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

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,

sufcient circulation through the

radiators cannot be ensured,
putting the room heating in

question.

Recommendation: Convert
open systems into sealed
systems.

Note

213060918_1203

DHW cylinder to boiler pipework

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.

Note

Boiler return

Boiler ow

Hoses with gaskets

Sensor well for DHW

cylinder sensor

Cold water inlet

DHW circulation

DHW outlet

Filling / Draining

Cylinder loading pump
incl. gaskets

Ferrule with
union nut

Gravity brake

Elbows

DHW cylinder to boiler pipework

22

3060918_1203

Filling the heating system

Fill the system and vent it properly to safe­guard the perfect boiler function.

Before connecting the boiler

to the heating system, ush

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 lled, if a

type-tested safety valve (ope­ning pressure maximum 3 bar)
has been installed.

Note

Note

Filling the heating system

Connection for venting

and safety ow

Filling

• With the boiler in a cold condition, ll
the heating system slowly via the ll

and drain valve, until 1 bar pressure is
indicated. Inhibitors are not permissible.

Automatic air-vent valve

Locking cap

Automatic
air-vent valve

• Open the cap of the quick-action air-vent

valve of the safety assembly (accessory)
by one revolution, but do not remove
the cap.

Boiler ll and drain valve

Hose connection

• Connect a water hose to the lling/drain

valve (on-site).

233060918_1203

Filling the heating system

• Observe the pressure gauge of the

safety equipment assembly when lling

the system with water.

Safety assembly pressure gauge

Pressure gauge

• 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 automati-

cally vents via the air-vent valve.

24

3060918_1203

Draining the heating system

Boiler ll and drain valve

Hose connection

Draining the heating system

Connection for venting

and safety ow

Drain

• 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.

253060918_1203

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 ange,

whose thread penetrates the

boiler ange by a maximum of

15 mm. Only use pressure jet
gas burners compliant with EC
Directive 90/396/EEC.

Boiler ange

Burner ange holes

1NT1 T2 S3 B4

BS MV

Burner plug wiring diagram

26

3060918_1203

Initial start-up

Only qualied 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 - danger of
overheating and scalding.

• Check that all ue gas accessories have

been correctly installed.

• Open the shut-off valves on ow 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 superuous (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 ash in the display, if

the boiler/burner fails to start properly.
For details about error codes see the

quick-start 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 unoc-

cupied 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 ob-

structed by furniture or curtains.

Function checks

• During commissioning, check all control,
regulating and safety equipment for their

correct function and settings.

273060918_1203

Commissioning report

Commissioning steps

Test values and

conrmation

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 ue gas temperature

___________

tA [°C]

Ventilation air temperature

___________

tL [°C]

Net ue gas temperature

_______

(tA - tL ) [°C]

Carbon dioxide content (CO2) or oxygen content (O2)

______________

%

Carbon monoxide content (CO), free of air

____________

ppm

6.) Casing tted?

7.) System user trained, technical documents handed over?

8.) Conrm commissioning

28

3060918_1203

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.

Front casing

Front casing removal

• Switch OFF the heating system (see

operating instructions) and let it cool
down.

• Remove the front casing from the boiler.

• Pull the burner plug.

• Release the boiler door screws.

Boiler door screws

Boiler door removal

293060918_1203

Maintenance

Turbulators

Pulling out the turbulators

• Open the boiler door.

• Pull out the turbulators.

Cleaning using the cleaning brush

• Remove soot/sulphur deposits with the

cleaning brush supplied.

• Assemble in reverse order.

30

3060918_1203

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 ue gas temperature tA [°C] ________ tA [°C] ________

Ventilation air temperature t

L

[°C] ________ tL [°C] ________

Net ue gas temperature (t

A

- tL ) [°C] ____ (tA - tL ) [°C] ____

Carbon dioxide content (CO

2

) or % ___________ % ___________

Oxygen content (O

2

) % ___________ % ___________

Carbon monoxide content (CO), free of air ppm _________ ppm _________

5. Conrm maintenance

(company stamp, signature)

313060918_1203

Maintenance log

Date Date Date Date

tA [°C] ________ tA [°C] ________ tA [°C] ________ tA [°C] ________

t

L

[°C] ________ tL [°C] ________ tL [°C] ________ tL [°C] ________

(t

A

- tL ) [°C] ____ (tA - tL ) [°C] ____ (tA - tL ) [°C] ____ (tA - tL ) [°C] ____

% ___________ % ___________ % ___________ % ___________

% ___________ % ___________ % ___________ % ___________

ppm _________ ppm _________ ppm _________ ppm _________

32

3060918_1203

Specication

* 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 ue 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 ue gas systems, which

have been type-approved.

CHK / FHK / CNU-Premio / CHU-TH / FHU-TH 22 22
CHK-CB / FHK-FB / FHK-FE / CHU-Premio-CB

CHU-TH-CB / FHU-TH-FB / FHU-TH-FE

22/155 22/200

Output rangeexcl. burner, incl. TH burner kW 15-221 5-22
incl. Premio burner kW 19-22 19-22
Set-up burner output kW 21 21
DHW cylinder capacity CB & FB / FE litres 155/150 200
Constant DHW cylinder output CB & FB litres/h 540 540
FE litres/h 540 540
Performance factorCB & FB NL60 2.8 4.4
FE NL60 2.8 4.1
Number of boiler sections 3 3
Water content litres 29 29
Boiler gas content litres 33 33
Heating water pressure drop (at ∆T=20K) mbar 2 2
Maximum permissible boiler pressure bar 4 4
Maximum permissible DHW cylinder pressure bar 10 10
Rel. standby losses Boiler % 1.15 1.15
Boiler+DHW cylinder % 1.7 1.9
Required boiler draught Pa 10 10
Flue gas temperature* ° C 130/170 130/170

Flue gas mass ow rate* kg/h 25/37 25/37
Boiler, safety ow (female thread) Rp 1¼“ 1¼“

Boiler return (female thread) Rp 1¼“ 1¼“
Filling, draining, safety return (female thread) Rp ½“ ½“
Flue pipe diameter mm 129 129
Combustion chamber depth mm 350 350
Combustion chamber diameter mm 290 290
Weight Boiler kg 167 167
Burner kg 10 10
CHW cylinder CB and FB kg 66 83
DHW cylinder FE kg 98 121
Electrical supply
Maximum current (control unit and accessories)
Maximum current (in total, excluding pumps)
Switching capacity pumps, mixer, burner
Control unit fuse (maximum current)
Optional connection for mixer motors

333060918_1203

Specication

29 29 37 45 60

29/155 29/200 37/200 45/200 60/200

22-29 22-29 29-37 37-45 48-60
25-29 25-29 29-37 37-45 48-59

27 27 34 41 55

155/150 200 200 200 200

710 710 910 1100 1225
710 710 910 940 940

3.1 4.6 4.8 4.9 5.0

3.1 4.3 4.5 4.5 4.5
4 4 5 6 8

35 35 41 47 59
43 43 53 63 83

4 4 6 8 14
4 4 4 4 4

10 10 10 10 10

1.05 1.05 0.95 0.85 0.7

1.6 1.8 1.6 1.4 1.2

13 13 16 19 0

140/170 140/170 150/170 150/170 155/175

37/49 37/49 49/62 62/75 80/100

1¼“ 1¼“ 1¼“ 1¼“ 1¼“
1¼“ 1¼“ 1¼“ 1¼“ 1¼“

½“ ½“ ½“ ½“ ½“
129 129 149 149 149
450 450 550 650 850
290 290 290 290 290
198 198 229 260 322

10 10 15.5 15.5 15.5

66 83 83 83 83

98 121 121 121 121

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

3060918_1203

C

B

D

A

E

F

2

G

H

J

F

1

C

B

D

A

E

G

H

J

Dimensions

Observe the height of adjustable feet/bolts 20 mm ±10mm.

CHK / FHK / CHU-Premio
CHU-TH / FHU-TH

22 29 37 45 60

Boiler height A mm 835 835 835 835 835
Width B mm 660 660 660 660 660
Length C mm 640 740 840 940 1040
Plinth height D mm 280 280 280 280 280
Overall height incl. control unit E mm 1280 1280 1280 1280 1280
Silencer hood depth F

1

mm 336 336 345 345 345

Burner hood depth F

2

mm 235 235 235 260 275

Central heating return G mm 397 397 397 397 397
Smoke tube connector H mm 859 859 859 859 859
Central heating ow J mm 997 997 997 997 997

353060918_1203

C

B

D

A

E

F

2

H

K

J

L

M

G

F

1

C

B

D

A

E

H

K

J

L

M

G

Dimensions

Observe the height of adjustable feet/bolts 20 mm ±10mm.

CHK-CB / FHK-FB / FHK-FE / CHU-Premio-CB
CHU-TH-CB / FHU-FB / FHU-FE

37 45 60 45 60

Boiler height A mm 835 835 835 835 835
Width B mm 660 660 660 660 660
Length of 155 l DHW cylinder C mm 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
Overall height incl. control unit E mm 1625 1625 1625 1625 1625
Silencer hood depth F1 mm 336 336 345 345 345
Burner hood depth F2 mm 235 235 235 260 275
Central heating return G mm 742 742 742 742 742
Smoke tube connector H mm 1204 1204 1204 1204 1204
Central heating ow J mm 1342 1342 1342 1342 1342
Cold water inlet K mm 90 90 90 90 90
CB/FB DHW circulation L mm 412 412 412 412 412
FE DHW circulation L mm 312 312 312 312 312
DHW connection M mm 534 534 534 534 534

36

3060918_1203

Troubleshooting

Fault Cause Remedy
Burner does not start or

enters a fault state

No voltage present at the
control unit

Fuse, electrical connections,
Check the position of the ON/
OFF switch and heating sys.
emergency stop switch.

Oil tank empty / Gas supply

line shut off

Fill oil tank /
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 lter clogged Replace oil lter.

Heating circuit pump does
not start

System in summer mode Check summer/winter switch

position.

Heating circuit pump locked upTurn the pump shaft with a

screwdriver.

Heating circuit pump faulty Replace the heating circuit

pump.

Cylinder loading pump does
not run

DHW cylinder thermostat
faulty

Check DHW cylinder thermo­stat and replace, if necessary.

Cylinder loading pump seized upTurn the pump shaft with a

screwdriver.

Cylinder loading pump faulty Replace the DHW loading

pump.

Heating system operational,
but room temperature too low

Adjust maximum boiler tem­perature set too low.

Raise maximum boiler tem­perature.

Heat-up takes too long Heating water temperature

too low

(check at DHW cylinder ow,

not at the boiler)

Raise the temperature
(adjust thermostat)

Too little heating water
(creates wider spread, i.e. return
temperature too low)

Install larger DHW cylinder
loading pump

Indirect coil not vented Vent indirect coil with loading

pump OFF

Indirect coil scaled up Descale indirect coil

DHW temperature too low Thermostat switches OFF too

soon

Adjust thermostat

Return temperature too low
(e.g. spread too wide)

Return temperature too low
(e.g. spread too wide)