Buderus 800-24 User manual

7212 3700 - 02/2006 GB(EN) For the user
Please read thoroughly before operating the unit
Users manual
Gas wall hung Boiler condensing
Buderus 800 - 24/29/43/60 and
Buderus 800 - 24T25/29T25 H/V

Preface
2 Users manual Buderus 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • Edition 02/2006
Subject to modifications resulting from technical improvements ! Buderus Ltd. • http://www.buderus-domestic.co.uk
Introduction
Please read these instructions and follow them carefully
for a safe and economical use of your boiler.
Important general instructions for use
This device should only be used for its intended purpose
and in accordance with the operating instructions.
It is the law 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, The Building Regulations, current I.E.E.
Wiring Regulations and the relevant British Standard
Codes of Practice.
The device may only be used in combination with the
units, accessories and spare parts listed in the
installation and servicing 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.

Users manual
Users manual Buderus 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • Edition 02/2006 3
Subject to modifications resulting from technical improvements ! Buderus Ltd. • http://www.buderus-domestic.co.uk
Dear Customer,
Your Buderus 800 Series wall-mounted condensing gas
boiler has been designed and built in accordance with
state-of-the-art technological standards and the recog-
nised 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.
1 Safety instructions
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 TRANSCO (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.
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.
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 ie:
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 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.
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.

Users manual
4 Users manual Buderus 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • Edition 02/2006
Subject to modifications resulting from technical improvements ! Buderus Ltd. • http://www.buderus-domestic.co.uk
6 Commissioning
6.1 Preparing the boiler for operation
Note the operating instructions of the control unit.
zOpen the control panel cover.
zCheck the water pressure (fig. 1, item 3).
If the pressure is below 1.0 bar, top up water and
purge air from the system.
Max. water pressure 2.0 bar.
If water is lost frequently, have a specialist company
look for and eliminate the cause.
zAdjust the flow temperature on the controller
(fig. 1, item 1) using table 1.
zAdjust the hot water temperature on the controller
(fig. 1, item 2) using table 2.
zUse the control unit or remote control unit to set
the room temperature to maximum.
zOpen the gas service valve: push in and turn to the
left in vertical position (fig. 1, item 4).
zTurn the mains switch (fig. 1, item 5) into position "I".
The boiler runs through the start-up program and the
burner is ignited after approx. 30 seconds.
zClose the control panel cover.
zUse the control unit or remote control unit to adjust
the room temperature to the desired value.
Fig. 1 Control panel, pressure display, gas service valve
Tab. 1 Flow water temperature
* Basic setting: the actual flow water temperature is determined by the digital control system.
Have specific system settings adjusted on the digital control system by the specialist heating system company.
Tab. 2 Hot water temperature
12
10
1
01
11
KW
10
1
10
1
I
0
12
3
4
5
Control unit Application Controller position / flow temperature
Digital Room Controller iRT
HW4201, RC
Floor heating
Radiator heating
1(40°C)*
8(80°C, factory setting)*
ON/OFF temperature controller, 24 V Floor heating
Radiator heating
1(40
°C)
6 (40 °C, new building) up to
8 (80 °C, old building)
Application Controller
position
Hot water temperature of external reservoirs
Minor convenience, small heat losses 1 27 °C
Average convenience, medium heat losses 5 40 °C
Optimum convenience, normal heat losses 10 60 °C

Users manual
Users manual Buderus 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • Edition 02/2006 5
Subject to modifications resulting from technical improvements ! Buderus Ltd. • http://www.buderus-domestic.co.uk
6.2 Topping up the heating system
AWARNING
The wall-mounted condensing gas boiler must
not be activated at this stage.
When using oxygen-permeable pipes (e.g. for floor
heating), heat exchangers must be used to separate the
system.
zMove the mechanical switch on the three-way valve
to centre position (fig. 2) (applicable for 24T25 and
29T25 only and systems with an external storage-
type water heater).
zConnect temporary hose of the filling loop.
zOpen both stop valves.
zFill the system to a pressure of 1.0 to 1.2 bar (fig. 4).
Max. water pressure is 2.0 bar.
zShut both stop valves and disconnect the filling loop.
6.3 Combustion fuels
Natural gas, propane.
Fig. 2 Mechanical switch on the three-way valve
Fig. 3 Connecting temporary hose
Fig. 4 Pressure display
temporary
hose
stop
valve stop
valve
double
check
valve
DHW
cold CH return
12
10
1
01
11
KW
10
1
10
1
I
0

Users manual
6 Users manual Buderus 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • Edition 02/2006
Subject to modifications resulting from technical improvements ! Buderus Ltd. • http://www.buderus-domestic.co.uk
6.4 Frost hazards for the heating system
Where there is a risk of frost damage to the heating
system:
zOpen the control panel cover.
zOpen the cover of control level 2 (fig. 5, item 1).
zTurn the "pump" switch (into position "2"
(24-hour pump over-run time) (fig. 5, item 5).
zClose the covers of control level 2 and of the control
panel.
6.5 Operational and fault messages
(table 3)
Operating conditions or possible faults are shown on the
display (fig. 5, item 4). The message is displayed in form
of two characters. The second character is displayed
after pressing the service button (fig. 5, item 3).
All messages not contained in table 3 should be recor-
ded as these refer to malfunctions and faults that should
be rectified or eliminated by a specialist technician.
Fig. 5 Operational and fault messages
Tab. 3 Operational and fault messages
* flashing after three start-up trials
7 Shutting down the boiler
zOpen the control panel cover.
zTurn the mains switch (fig. 6, item 1) into position "0".
zClose the gas service valve by turning it to the right
(fig. 6, item 2).
zClose the control panel cover.
zLong shutdown periods also require the water feed
pipe to be closed.
Frost hazard for the heating system
zTurn the mains switch into position "I" and leave the
gas service valve open.
zUse the control unit or remote control unit to set the
room temperature to minimum or to frost-proof.
INOTE!
If you intend to fully shut down the system under
frost hazard conditions, the water has to be
drained from the entire system.
The use of antifreezing compounds is
prohibited.
To drain the system take the following steps:
zClose the CH flow and the CH return service valve.
12
10
1
01
11
KW
10
1
10
1
0
I
12
10
1
01
11
KW
10
10
1
234
5
1
Display Display after pressing
the service button
Meaning Rectification
0 A, H, L, P, U, Y Boiler is ready for operation
6*ABurner not ignited Press reset button (fig. 5, item 2) and
keep it pressed for about 5 seconds.
If the burner is not ignited after
several unlocking operations, consult
a specialist company.
-. H Normal heating operation
=. H Normal hot water operation

Users manual
Users manual Buderus 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • Edition 02/2006 7
Subject to modifications resulting from technical improvements ! Buderus Ltd. • http://www.buderus-domestic.co.uk
zPlace hose on the draining tule.
zTurn to drain the system.
Fig. 6 Mains switch, gas service valve
12
10
1
01
11
KW
10
1
10
1
I
0
1
4
2

Heating system specialist:
Buderus
Cotswold Way
Warndon
Worcester
WR4 9SW
Telephone: 01905 - 752 936
Fax: 01905 - 753 130
www.buderus-domestic.co.uk
Buderus is a trading name of BBT Thermotechnology UK Ltd.
Customer Services:
Technical Product Support:
Sales:
Returns:
Spares:
Tel: 0870 - 421 5933
Tel: 0870 - 421 5944
Tel: 01905 - 752 640
Tel: 01905 - 752 531
Tel: 01905 - 752 576
Fax: 01905 - 456 445 / 455 394
Fax: 01905 - 455 392
Fax: 01905 - 754 620
721.237A - 4612 - 02/2006