General
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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
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Observe the relevant standards, regulations and legislation
of the country or region of final use.
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CAUTION!
Use this boiler for its intended purpose only.
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DANGER!
Notes relating to the heating system water.
Thoroughly flush the system before it is filled with
water. Use only untreated water or water treatment
product such as Sentinel X100 to fill and top up the sys-
tem. For more information about Sentinel call 0151 420
9563.
When using water treatment, only products suitable for
use with Buderus heat exchangers are permitted (e.g.
Sentinel X100). Your warranty is at risk if an incorrect
water treatment product is used in conjunction with this
appliance.
For more information, contact Buderus Technical Prod-
uct Support Department.
It is most important that the correct concentration of the
water treatment product is maintained in accordance
with the manufacturer's instructions.
If the boiler is used in an existing system any unsuita-
ble additives MUST be removed by thorough cleaning.
BS.7593:1992 details the steps necessary to clean a
domestic central heating system.
In hard water areas, treatment to prevent lime scale
may be necessary - however, the use of artificially sof-
tened water is NOT permitted.
Under no circumstances should the boiler be fired
before the system has been thoroughly flushed.
Do not use artificially softened water.
Only plastic pipework containing a polymeric barrier
should be used.
It is allowed to use copper for the first 600 mm.
I
NOTE:
Notes relating to domestic hot water
z
The domestic hot water service must be in
accordance with
BS 5546
and
BS 6700
.
z
The boilers are suitable for connection to most types
of washing machine and dishwasher appliances.
z
When connecting to suitable showers, ensure that:
a. The shower is capable of accepting mains
pressures and temperatures up to 65 °C.
b. The shower is ideally thermostatic or pressure
balancing.
z
Where temporary hardness exceeds 150 mg/litre,
it is recommended that a proprietary scale reducing
device is fitted into the boiler cold supply with the
requirements of the local water company.
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CAUTION!
Provision must be made to accommodate the expan-
sion of DHW contained within the appliance, where a
back flow prevention device is fitted
BS. 67989: §5.4.3
.
Safe handling of substances
No asbestos, mercury or CFCs are included in any part of the
boiler and its manufacture.
box 4
Hazard definitions and abbreviations
Hazard definitions
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DANGER:
Indicates the presence of hazards that will cause
severe personal injury, death or substantial property
damage.
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WARNING:
Indicates the presence of hazards that can cause
severe personal injury, death or substantial property
damage.
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CAUTION:
Indicates presence of hazards that will or cause minor
personal injury or property damage.
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NOTICE:
Indicates special instructions on installation, operation
or maintenance that are important but not related to
personal injury or property damage.
Abbreviations
AV
= Air Vent
BCT
= Buderus cylinder thermostat
BDV
= Buderus diverter valve
CB
= Connection Block
CH
= Central Heating
CHF
= Central Heating Flow
CHR
= Central Heating Return
CT
= Cylinder Thermostat
CWDO = Condensate water drainage outlet
DHW = Domestic Hot Water
DV
= Diverter Valve
E
= Earth
L
= Live
LSV
= Lock Shield Valve
MCW = Mains Cold Water
N
= Neutal
JB
= Junction Box / RTH Relay
PL
= Permanent Live
Prog
= Programmer
PRV
= Pressure relief valve (safety valve)
RT
= Room Thermostat
RV
= ModuLink 250 RF Receiver
T
= Timer
TRV
= Thermostatic Radiator Valve
WC
= Wiring Centre
ZV
= Two Port Zone Valve
