20
ENGLISH
1m
T
L
C
A
A
Concentric flue kit
C
Condensation exhaust system (not supplied)
T
Terminal
L
Maximum straight length
(This length must be reduced by 1 metre for every
90° curve and by 0.5 metres for every 45° curve.)
Description
ACQUAHOME R BLU
L
7
m
b
Use of flues longer than the specified maximum leads to
a loss of heat output from the boiler.
b
Never obstruct or choke the comburent air intake pipe.
System filling and emptying
ACQUAHOME R BLU
boilers require a filling pipe connected to
the central heating circuit return pipe.
Before carrying out system filling and emptying operations, set
the main switch of the system to OFF and the main switch of
the equipment to (
0
).
Water quality requirements
The manufacturer recommends the use of water as heat trans-
fer fluid for the central heating system. A chemical treatment
system must be provided for this water.
The heat transfer fluid (water) for the central heating circuit
must conform to the quality parameters given in the following
table:
REFERENCE VALUES
pH
6-8
Electrical conductivity
less than 200 μS/cm (25°C)
Chlorine ions
less than 50 ppm
Sulphuric acid ions
less than 50 ppm
Total iron
less than 0.3 ppm
Alkalinity M
less than 50 ppm
Total hardness
less than 35°F
Sulphur ions
none
Ammonia ions
none
Silicon ions
less than 30 ppm
If the hardness of the water exceeds the value specified in the
table, it is mandatory to install a water softening system.
b
Excessive water softening (leading to a total hardness
< 15°F) can cause corrosion in metal parts (pipes and
boiler components). Keep the electrical conductivity of
the water under 200 µS/cm.
a
Do not top up the central heating circuit on a frequent or
continuous basis as this can damage the boiler’s heat
exchanger. The use of automatic topping up systems
should be avoided for this reason.
