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6
FILLING AND EMPTYING THE SYSTEM
.
The central heating system can be filled up once the
water mains have been connected up.
This must be done while the installation is cold by:
• giving two or three turns to the cap of the automatic air
vent valve (A, fig. 5a and 5b) to open it;
• making sure the cold water inlet tap is open (MIX C.S.I.
only)
• opening the filling tap (C, on the boiler for MIX C.S.I.,
external for MIX R.S.I.) until the pressure on the
hydrometer (D) is between 1 and 1,5 bar (fig. 5a and 5b).
Close the filling tap after filling it up.
The boiler is equipped with an efficient air separator so
that there is no need to do anything manually.
The burner only ignites when air venting has finished.
NOTE (MIX C.S.I. only): even if the boiler is fitted with a
semi-automatic filling system, open tap C to fill the circuit
the first time.
NOTE (MIX R.S.I. only): manual filling tap is not supplied
with the boiler, foresee one external or verify if external
water tank has one.
Empty the system by:
• switching off the boiler
• connect the rubber hose, supplied standard, to the boiler
drain valve (E, fig. 5a and 5b)
• loosening the valve by hand (E)
• emptying out the lowest parts of the system.
DHW system emptying (MIX C.S.I. only)
The hot water system must be emptied every time there
is risk of freezing by:
• turning off the tap at the mains
• turning on all the hot and cold taps
• emptying out the lowest parts of the system.
ATTENTION
The safety valve outlet (B) must be connected to a suitable
collection system.
The manufacturer shall not be held liable if the safety val-
ve should eventually cause flooding.
7
.
AND BURNING AIR SUCTION
Refer to regulations in force for exhaustion of combustion
products.
Boiler is provided for without fume exhaustion/air suction
kit, since forced draught sealed chamber accessories can
be used, as they better adapt to installation characteristics.
For fume extraction and burning air restoration in boiler,
use original pipes or other EC-certified pipes with equiva-
lent characteristics; check connection is correct as shown
on instructions fume accessories provided for with. More
appliances can be connected to a single chimney, provided
that all appliances are sealed chamber type.
Boiler is a C-type appliance (sealed chamber) and must
be safely connected to fume exhaustion duct and burning
air suction duct, both getting outside; appliance cannot
operate without these ducts.
FUMES EXHAUSTION
Fig. 5a
MIX C.S.I.
A
B
E
Fig. 5b
MIX R.S.I.
A
B
E
Fig. 6
C52
C32
C32
C82
C22
C12
EXHAUSTION CONFIGURATIONS
Boiler is homologated for the following exhaustion configurations:
C12
Concentric wall exhaustion. Pipes can separately start from boiler, but
outlets must be concentric or close enough to be subject to similar
wind conditions (within 50 cm)
C22
Concentric exhaustion in common chimney (suction and exhaustion
in the same chimney)
C32
Concentric roof exhaustion. Outlets like C12
C42
Exhaustion and suction in common separate chimneys, but subject
to similar wind conditions
C52
Wall or roof separate exhaustion and suction in different pressure
areas. Exhaustion and suction must never be located on opposite
walls
C62
Exhaustion and suction with separately certified and sold pipes (1856/1)
C82
Single or common chimney exhaustion and wall suction
9
D
C
D
C42
C22
C42
C52
C12
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