Buderus Buderus 500 - 24/C 28/C USER MANUAL (721.535A - 2219A - 02/2005)

7215 3500 - 02/2005 GB(EN) For the user

Users manual

Wall-mounted condensing gas combi
boiler Buderus 500 - 24/C, 500 - 28/C

Please read thoroughly before operating the unit

Introduction

Please read these instruc­tions and follow them care­fully for a safe and
economical use of your
combi boiler.

Important general
instructions for use

This device should only be
used for its intended purpose
and in accordance with the
regulations.

It is a requirement and in
your own interest, and that of
safety that this boiler must be
installed by a CORGI regis­tered installer, in accordance
with the relevant require­ments of the current Gas
Safety (Installation and Use)
Regulations,

2 http://www.boulter-buderus.co.uk

The Building Regulations, current I.E.E. Wiring Regulations
and the relevant British Standard Codes of Practise.

The device may only be used in combination with the units,
accessories and spare parts listed in the installation and

maintenance instructions.
Other combinations of units, accessories and consumables

are only to be used if they completely fulfil the specifications
involved, and if system performance and safety are not
affected in any way.

Subject to technical modifications

As a result of our policy of constant development, there may
be small differences with respect to illustrations, functional
steps and technical data.

Cleaning

For normal cleaning simply dust with a dry cloth. To remove
stubborn marks and stains, wipe with a damp cloth and soap
and finish off with a dry cloth.

DO NOT use abrasive cleaning materials.

G. C. Aplliance No. :

Buderus 500-24/C : 41-110-04
Buderus 500-28/C : 41-110-03

http://www.boulter-buderus.co.uk 3

Contents

1 Safety precautions . . . . . . . . . . . . . . . . . . . 6

2 Installation area / boiler room . . . . . . . . . . 7

3 Working in the heating system . . . . . . . . . 8

4 Functions of the system and operating

instructions. . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Conversion to LPG. . . . . . . . . . . . . . . . . . . 9

7 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . 9

8 Permanent clearances . . . . . . . . . . . . . . . 10

9 DBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

10 Initial start-up . . . . . . . . . . . . . . . . . . . . . . 16

10.1 Preparing for operation. . . . . . . . . . . . . . . . . . . . . 16

10.1.1 Check water pressure . . . . . . . . . . . . . . . . . . . . . 16

10.1.2 Topping up the heating system . . . . . . . . . . . . . . 17

10.1.3 Temperature-setting adjustments. . . . . . . . . . . . . 20

10.2 Operational and fault codes . . . . . . . . . . . . . . . . . 23

11 Taking the system out of service . . . . . . 24

11.1 Draining the system in case of frost . . . . . . . . . . . 25

4 http://www.boulter-buderus.co.uk

Preface

Dear Customer,

Your Buderus 500 Series wall-mounted condensing gas
combi boiler has been designed and built in accordance with
state-of-the-art technological standards and the recognised
safety rules. Special focus has been placed on operator
convenience in this respect.

Carefully read the safety instructions and operating manual to
ensure safe, economic and ecologically beneficial use of the
unit.

Due to the high efficiency of the boiler a plume of water vapour
may form at the terminal during operation. This is normal.

http://www.boulter-buderus.co.uk 5

1

Safety precautions

1 Safety precautions

ADANGER! If you smell gas:

1) No naked flames ! Do not smoke !

2) Avoid sparks ! Do not operate electrical swit­ches. Do not use the telephone, plug-in devices
of any kind or the doorbell!

3) Shut off the main gas supply!

4) Open windows and doors!

5) Warn building occupants and evacuate the
building!

6) Call the gas distributor (under 'GAS' in the
telephone directory) from outside the building!

INOTE

In the event of any other type of incident, shut off the
main gas supply and electric supply to the appliance
and seek assistance from a CORGI registered
engineer.

6 http://www.boulter-buderus.co.uk

Installation area / boiler room

2

2 Installation area / boiler room

ADANGER!

The air intake and outlet openings must not be reduced
in size or closed.

ADANGER!

Do not store or use inflammable materials or liquids
near the heating boiler.

INOTE

To prevent the boiler from being damaged, care must
be taken not to contaminate the combustion air with
halogenated hydrocarbons (e. g. contained in aerosol
sprays, solvents, detergents, paints, and adhesives), or
with high quantities of dust. The room in which the
boiler is installed must be frost-proof and be well
ventilated.

http://www.boulter-buderus.co.uk 7

3

Working in the heating system

3 Working in the heating system

ADANGER!

Only a CORGI registered Engineer is to be entrusted
with the installation of this boiler, the gas supply and the
flue connection. Commissioning, Servicing and any
Repairs must be carried out by a competent person i.e.:
a CORGI Registered Engineer.
All CORGI Registered Installers carry a CORGI
identification card and have a registration number.
Both should be recorded in your boiler logbook.
You can check if your installer/Engineer is registered by
telephoning 01256 372300 or by writing to:
CORGI, 1 Elmwood, Chineham Business Park,
Crockford Lane, Basingstoke. RG24 8WG.

INOTE

It is mandatory to clean and service the system once a
year ! This includes an inspection of the entire system
to see if it is in full working order. Any faults and defects
found in the course of inspection must be rectified
immediately.

It is recommended to enter into a service contract with a
specialist company.

8 http://www.boulter-buderus.co.uk

Functions of the system and operating instructions

4

4 Functions of the system and operating

instructions

The installer should familiarize the user with the functions and
operation of the heating system and ensure that a complete
set of technical documentation is supplied.

5 Maintenance

The appliance should be serviced at least once a year by a
CORGI registered installer.

6 Conversion to LPG

The boiler is suited for natural gas. To convert the boiler to
LPG you must contact a CORGI registered fitter.

7 Abbreviations

DBA = Control unit (Dedicated Burner Automat)
MCW inlet = Mains Cold Water inlet
DHW outlet= Domestic Hot Water warm outlet
CH flow = Central Heating flow
CH return = Central Heating return.

http://www.boulter-buderus.co.uk 9

8

Permanent clearances

8 Permanent clearances

The boiler must be located in an area with the following
permanent clearances.

8 mm

fig. 1

8 mm

21 mm

21 mm

10 http://www.boulter-buderus.co.uk

8 mm

Permanent clearances

INOTE

8

The permanent clearances do not change if a wall
spacing frame is used.
The installer or service engineer must be able to create
sufficient service clearences. These clearences should
have been considered at time of installation.

http://www.boulter-buderus.co.uk 11

9

DBA

9DBA

4

3

2

1

fig. 2 DBA

12 http://www.boulter-buderus.co.uk

5

6

7

Key to fig. 2 :

item 1: mains switch
item 2: "reset" button
item 3: "service" button
item 4: display

DBA

item 5: "menu" button
item 6: adjusting arrow up
item 7: adjusting arrow down

9

The boiler is equipped with a DBA. This is the internal control
of the boiler. The DBA is located behind the access panel.

The DBA allows you to operate the boiler and to make adjust­ments in its settings.

DBA overview:

1. Mains switch (see fig. 2).

Use this switch to turn the boiler on or off.

2. Reset button "

B" (see fig. 2)

When a blinking code is in the display, it is possible to try and
restart the boiler by pressing this button.

INOTE

It is not possible to reset the boiler when there is no
fault code blinking in the display.

http://www.boulter-buderus.co.uk 13

9

DBA

3. Service Button "A" (see fig. 2)

Is used for servicing purposes only.

DO NOT use this button!

4. Display (see fig. 2)

The display visualizes settings, adjustments and fault codes
(see fig. 3).

fig. 3 DBA display

14 http://www.boulter-buderus.co.uk

DBA

5. Menu button "E" (see fig. 2)

The menu button "E" allows you to scroll through the menu

items.

Pressing the E button once, the current warm start function

setting is displayed.

Pressing the E button again gives the current DHW tempe-

rature setting is displayed.

Pressing the E button again gives the current setting of

summer operation.

Pressing the E button once more gives the current CH flow

temperature setting.

6. and 7. Up "

These keys can be used for adjusting temperatures and
activating or de-activating certain summer operation.

The C key when pressed gives the current operating status

of the boiler.

http://www.boulter-buderus.co.uk 15

C" and Down "D" keys (see fig. 2)

9

10

Initial start-up

10 Initial start-up

10.1 Preparing for operation

Please also note the user manual supplied with the
external time controls and thermostat.

10.1.1 Check water pressure

z Check the pressure gauge (fig. 4, item 3) located at the

bottom of the boiler for the current system pressure.
Optimum system pressure is 1.5 bar.

3

3

DHW
outlet

1

flow

fig. 4 Servicing valves

16 http://www.boulter-buderus.co.uk

GasCH

MCW

inlet

CH

2

return

Initial start-up

10

10.1.2 Topping up the heating system

AWARNING!

The wall-mounted condensing gas combi boiler must

not be activated at this stage.
The system should be filled with untreated mains water.
z Turn off the boiler by setting the mains switch to "0" (fig. 5,

item 1).

z If necessary open the CH flow and CH return servicing

valves (fig. 4, item 1 and 2).

ON

OFF

1

fig. 5 DBA – Mains switch

http://www.boulter-buderus.co.uk 17

10

Initial start-up

stop

valve

stop

valve

double

check

valve

MCW

inlet

fig. 6 Filling loop

z Connect filling loop (accessory) (fig. 6).
z Open both stop valves (fig. 6).
z Fill the system to a pressure of approx. 1.5 bar

(fig. 4, item 3).

z Shut both stop valves.
z Disconnect the filling loop.
z Vent all radiators from air starting with the lowest radiator

and working your way up to the highest point.

18 http://www.boulter-buderus.co.uk

filling

loop

CH

return

Initial start-up

10

z Check the pressure after venting. If the pressure has

dropped under 1.0 bar then top up the system as described
previously.

z Disconnect the filling loop and cap off.

INOTE

If there are frequent water losses, have the system

examined and repaired by a CORGI registered

installer. Have the inhibitor concentration checked

every year.

http://www.boulter-buderus.co.uk 19

10

Initial start-up

10.1.3 Temperature-setting adjustments

Setting the warm start function

z Press E button once.
z Use the C and D keys to turn the warm start function on

or off (table 1). Factory setting: warm start function is "on".

Setting Meaning

H - ECO / cold start

I - comfort / warm start

table 1 Warm start function

Setting the domestic hot water (DHW) temperature

z Press E button (see fig. 7, item 2) twice then adjust the

DHW temperature to the desired temperature (40 °C -

60 °C) using the C and D keys (fig. 7, item 1).

Factory setting is 48 °C.

20 http://www.boulter-buderus.co.uk

More energy efficient, less chance of
calcification, longer waiting periods.

Maximum comfort due to short wait­ing period for warm water. Not as
energy efficient as the cold start and
there is more chance of calcification.

Initial start-up

10

1

2

3

fig. 7 DBA – Mains switch

Setting the boiler to summer operation

When you want to make sure that your boiler will not operate
for central heating in the summer then you can set the boiler
to summer operation. The boiler will then only operate for
DHW.

http://www.boulter-buderus.co.uk 21

10

Initial start-up

z Press the E button (see fig. 7, item 2) three times.

The current setting blinks.

z Use the C and D keys to adjust to desired setting.

K
L

INOTE

Setting the flow temperature for CH

z Press E button (see fig. 7, item 2) four times then adjust

It is not possible to set the flow temperature when the boiler is
set to summer operation.

22 http://www.boulter-buderus.co.uk

Central heating is on.

Central heating is off (summer operation).

DHW is still available.

When summer operation is active then the boiler will
not operate for central heating until summer operation
has been deactivated.

the flow temperature to the desired temperature (30 °C –

80 °C) using the C and D keys (see fig. 7, item 1).

Factory setting is 80 °C.

Initial start-up

10

10.2 Operational and fault codes

Operating conditions and possible faults can be seen,

pressing the C key.

All codes not contained in table 2 should be noted down
separately. These are malfunctions that require the presence
of a CORGI installer.

Display after
pressing
service but-

C"

ton "

0A, 0C, 0E, 0H,
0L, 0U, 0Y

6A Burner not

-H Normal heating

=H Normal hot

table 2 Operational and fault codes

http://www.boulter-buderus.co.uk 23

Meaning Rectification

Boiler is ready
for operation

ignited

mode

water mode

Press Reset button “B“ (fig. 7,

item 3). If the burner fails to ignite
after several unblocking opera­tions, consult a CORGI installer.

Maximum comfort when set at
60 °C

11

Taking the system out of service

11 Taking the system out of service

z Push the mains power switch (fig. 5, item 1) to “0”.
z Close the gas service valve by turning it clockwise (fig. 8,

item 1).

drain

1

1: Gas valve closed 2: Gas valve open

fig. 8 Gas service valve

Frost protection

The boiler has an automatic frost protection. When the CH
flow temperature drops below 7 °C then the boiler will start up.

24 http://www.boulter-buderus.co.uk

2

Taking the system out of service

11

11.1 Draining the system in case of frost

It is not recommended, but if the boiler needs to be shut down
for a longer period of time, then it is necessary to drain the
system. Especially when there is a chance for frost conditions.

z Turn off the boiler by setting the mains power to "0" (fig. 5,

item 1).

z Close the gas valve (fig. 8, item 1).

fig. 9 Draining the system

z Drain the system at its lowest point using the stop valves or

radiator (see fig. 9). The automatic air vent at the system’s
highest point must be open.

http://www.boulter-buderus.co.uk 25

Notes

26 http://www.boulter-buderus.co.uk

Notes

http://www.boulter-buderus.co.uk 27

Boulter Buderus Ltd.

Magnet House

30 Whitehouse Road

Ipswich

Suffolk, IP1 5JA

Telephone: [phone] - 241555

Fax: [phone] - 241321

Sales Boilers: 0044 (0)1473 - 243780

Customer Services (gas): 0044 (0)870 - 421 5933

Technical Product Support (gas): 0044 (0)870 - 421 5944

http://www.boulter-buderus.co.uk

e-mail: [e-mail]

721.535A - 2219A - 02/2005