Buderus 800 - Page 5

Preface
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
5
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 Sentinal
X100 to fill and top up the system.
When using water treatment, only products
suitable for use with Buderus heat
exchangers are permitted (eg 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 Product
Support Department.
It is most important that the correct
concentration of the watertreatment product
is maintained in accordance with the
manufacturer's instructions.
If the boiler is used in an existing system
any unsuitable 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 softened water is NOT
permitted.
Under no circumstances should the boiler
be fired before the system has been
thoroughly flushed.
 Do not use water softened in a salt
bedding exchanger.
 Do not use inhibitors, anti-freeze or
other additives.
 The expansion vessel must be of
sufficient size.
When oxygen-permeable pipes are used
(e. g. for floor heating systems) the system
must be separated by means of heat
exchangers. Unsuitable heating water
promotes sludge formation and corrosion.
This may cause malfunctions and damage
in the heat exchanger.
NOTE:
Notes relating to domestic hot water.
 The domestic hot water service must
be in accordance with
BS 5546 and BS
6700
.
 The boilers are suitable for connection
to most types of washing machine and
dishwasher appliances.
 When connecting to suitable showers,
ensure that:
a. The cold inlet to the boiler is fitted with
an approved anti-vacuum or syphon
non-return valve.
b. Hot and cold water supplies to the
shower are of equal pressure.
 Where the water 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.
CAUTION
Provision must be made to accomodate
the expansion of DHW contained within
the appliance, if a non-return valve is fitted
to the DHW inlet, as detailed in
BS. 6798: 5.4.3.