Technical data

22
remeha W40/60-m ECO
7.6 Installation details
7.6.1 Condensate discharge
Discharge the condensate directly into a drain. Only use
synthetic material for the connecting piping, because of
the acidity (pH 3 - 5). Fill the siphon with water after fit-
ting. With an open connection to the drain (see fig.14) .
The discharge piping shall slope at least 30 mm/m. It is
not permitted to discharge condensate into a gutter,
because of the risk of freezing.
drain
Fig. 14 Condensate discharge drain
7.6.2 Cold feed and expansion tank height for open
vented systems
The cold feed and expansion tank heights for all open
vented systems must comply with the requirements laid
down in the Health and Safety Executive publication
PM5. For the remeha W40/60-m ECO installations this
requirement is met providing the tank height is at least 3
meters above the highest circulating point of the system
(see para. 7.7.2, fig. 15) .
7.6.3 Water treatment
Water treatment of all systems, but in particular open
vented systems used with the remeha W40/60-m ECO ,
is considered necessary good practice in order to:
a. avoid metallic corrosion within the system
b. avoid sludge and scale information
c. reduce to a minimum the risk of microbiological
contamination of the system
d. minimise chemical action and changes which take
place over a period of time when system water is
untreated.
The boiler contains an aluminium heat exchanger and
the system will also contain a variety of metals. Ferrous
metals - cast iron and steel, and non-ferrous metals -
copper, brass and gunmetal, may be present, so it is
essential that treatment is suitable for all of them.
Suitable chemicals and the extent of treatment should
be discussed with specialist manufacturers prior to any
work commencing. The specification of new systems
and general condition of older existing systems must be
carefully considered. The removal of debris, flux residue,
grease, metal, swarf etc. from new systems, and any
black magnetic iron oxide sludge and other corrosive
residue from old systems is essential.
Most important
Water treatment must not allow the system water to
exceed a ph of 9.
The boiler must be isolated from the system when using
chemicals to clean the system prior to use.
For information on water treatment we advise direct con-
tact with either:
Fernox Manufacturing Company Ltd.
Britannia Works
Clavering
Essex, CB1L 4QZ
Tel No: 0799 550811
or: Sentinal
Grace Dearborn Ltd
Widnes
Cheshire WA8 8UD
Tel No: 051 495 1861.