Buderus 800-24 User manual

Users manual Wall-mounted
condensing gas boiler
Buderus 800 - 24/29/43/60 and
Buderus 800 - 24T25/29T25 H/V
7212 3700 (03/2010) GB
For the user
Please read thoroughly
before operating the unit

Preface
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
2
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 Gas Safe
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.

Safety instructions 1
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements! 3
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
2 Installation area / boiler
room
3 Working in the heating
system
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 Gas Safe registered installer.
DANGER!
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 de-
vices 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 tel-
ephone directory) from outside the
building!
NOTE
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 Gas Safe registered engineer.
DANGER!
The air intake and outlet openings must not
be reduced in size or closed.
DANGER!
Do not store or use inflammable materials or
liquids near the heating boiler.
NOTE
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.
DANGER !
Only a Gas Safe 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 Gas Safe Registered Engineer.
All Gas Safe Registered Installers carry a
Gas Safe 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 0800 408 5500 or by writing
to:
Gas Safe Register
PO BOX 6804
Basingstoke
RG24 4NB
NOTE
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.

Commissioning6
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
4
6 Commissioning
6.1 Preparing the boiler for operation
Note the operating instructions of the control unit.
Open the control panel cover.
Check 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.
Adjust the flow temperature on the controller
(fig. 1, item 1) using table 1.
Adjust the hot water temperature on the controller
(fig. 1, item 2) using table 2.
Use the control unit or remote control unit to set
the room temperature to maximum.
Open the gas service valve: push in and turn to the
left in vertical position (fig. 1, item 4).
Turn 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.
Close the control panel cover.
Use the control unit or remote control unit to adjust
the room temperature to the desired value.
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 com-
pany.
Tab. 2 Hot water temperature
fig. 1 Control panel, pressure display, gas service valve
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

Commissioning 6
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements! 5
6.2 Topping up the heating system
When using oxygen-permeable pipes (e.g. for floor
heating), heat exchangers must be used to separate the
system.
Move 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).
Connect temporary hose of the filling loop.
Open both stop valves.
Fill the system to a pressure of 1.0 to 1.2 bar (fig. 4).
Max. water pressure is 2.0 bar.
Shut both stop valves and disconnect the filling loop.
6.3 Combustion fuels
Natural gas, propane.
fig. 2 Mechanical switch on the three-way valve
WARNING
The wall-mounted condensing gas boiler
must not be activated at this stage.
fig. 3 Connecting temporary hose
temporary
hose
stop
valve
stop
valve
double
check
valve
DHW
cold CH return
fig. 4 Pressure display
12
10
1
01
11
KW
10
1
10
1
I
0

Commissioning6
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
6
6.4 Frost hazards for the heating system
Where there is a risk of frost damage to the heating
system:
Open the control panel cover.
Open the cover of control level 2 (fig. 5, item 1).
Turn the "pump" switch (into position "2"
(24-hour pump over-run time) (fig. 5, item 5).
Close 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.
Tab. 3 Operational and fault messages
* flashing after three start-up trials
fig. 5 Operational and fault messages
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

Shutting down the boiler 7
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements! 7
7 Shutting down the boiler
Open the control panel cover.
Turn the mains switch (fig. 6, item 1) into position "0".
Close the gas service valve by turning it to the right
(fig. 6, item 2).
Close the control panel cover.
Long shutdown periods also require the water feed
pipe to be closed.
Frost hazard for the heating system
Turn the mains switch into position "I" and leave the
gas service valve open.
Use the control unit or remote control unit to set the
room temperature to minimum or to frost-proof.
To drain the system take the following steps:
Close the CH flow and the CH return service valve.
Place hose on the draining tule.
Turn to drain the system.
NOTE!
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.
fig. 6 Mains switch, gas service valve
12
10
1
01
11
KW
10
1
10
1
I
0
1
4
2

Bosch Thermotechnik GmbH
Sophienstrasse 30-32
D-35576 Wetzlar
www.buderus.de
[email protected]
721.237A 0004
Buderus
Cotswold Way, Warndon, Worcester WR4 9SW,
Customer service: 0844 892 9700
Technical support: 0844 892 3004
Fax: [phone]
United Kingdom
www.buderus-commercial.co.uk
In the UK and IE, Buderus is a brand name of
Bosch Thermotechnology Ltd.