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15
installation
Gas connection
Make sure, using the labels on the packaging and the data plate
on the appliance itself, that the boiler is in the correct country
and that the gas category for which the boiler was designed
corresponds to one of the categories available in the country
where it will be used.
The gas supply piping must be created and measured out in
compliance with speci c legal requirements and in accordance
with the maximum power of the boiler.
Check that the supplied gas corresponds to the type of gas for
which the boiler was designed (see the data plate located on the
appliance itself).
It is also important to check that the pressure of the gas (methane
or LPG) you will be using to feed the boiler is suitable, because if it
is insu cient the power may be reduced, causing inconvenience
for the user.
Instructions for opening the casing and performing an
internal inspection
Before performing any work on the boiler, rst disconnect it from
the electrical power supply using the external bipolar switch
removing the fuse and shutting o the gas valve.
To access the inside of the boiler, the following is necessary:
1. Remove the casing by unhooking it from the control panel (a)
2. Loosen the two screws on the front casing (b), pull it forwards
and unhook it from the upper pins (c)
3. Lower the control panel (d)
4. Unhook the two clips on the combustion chamber panel and
lift o (e).
(c)
Water connection
The illustration below shows the connections for the water and
gas attachments of the boiler. See valves con guration on page
14.
Check that the maximum water mains pressure does not exceed 6
bar; if it does, a pressure reducing valve must be installed.
For the measuring of the pipes and of the heating bodies in the
heating system, the residual head value should be calculated as a
function of the requested ow rate, in accordance with the values
shown in the circulation pump graph.
A. Central heating Flow
B. Domestic Hot Water Outlet
C. Gas Inlet
D. Domestic Cold Water Inlet
E. Central Heating Return
F. Safety Valve Discharge
H. Drain Valve
I. Drain condensate
(e)
A
B
C
D
E
I
H
F
A
C
D
E
I
H
F
CLAS HE EVO
CLAS HE EVO SYSTEM
(a)
(b)
(d)