Riello INSIEME EVOe 25 B/70 LN, Installation And Maintenance Manual

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INSTALLATION
1m
T
L
C
B
A
A Type C transformation accessory
B 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 INSIEME EVOe 25 B/70 LN
L
MAX
7 (*) m
(*) This length must be reduced by 1 metre for every 90° curve
and by 0.5 metres for every 45° curve.
9
Use of flues longer than the specified maximum leads to a
loss of heat output from the boiler.
9
Never obstruct or choke the comburent air intake pipe.
2.11 System filling and emptying
The thermal unit INSIEME EVOe 25 B/70 LN is equipped with an
internal system load valve (1), which can be reached by remov-
ing the front panel.
1
Before performing any system filling or emptying operation, set
the system main switch to OFF and the equipment main switch
to (0).
2.11.1 Water quality requirements
The manufacturer recommends the use of water as heat transfer
fluid for the central heating system. A chemical treatment sys-
tem 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.
9
Excessive water softening (leading to a total hardness < 15°F)
can cause corrosion in metal parts (pipes and boiler com-
ponents). Keep the electrical conductivity of the water un-
der 200 μS/cm.
0
Do not top up the central heating circuit on a frequent or
continuous basis as this can damage the boiler’s heat ex-
changer. The use of automatic topping up systems should
be avoided for this reason.