16
installation
To calculate the size of the heating installation, refer to the
"Available pressure" graph below.
Graph representing the available circulation pump pressure
Δ
T20
o
C
Before the equipment is used, for the fi rst time the trap
must be fi lled with water. To do this, add approximately
1/4 litre of water via the fl ue outlet before fi tting the fl ue
system, or unscrew the cap on the trap positioned under-
neath the boiler, fi ll it with water and refi t it
Warning! Insuffi
cient water in the trap can temporarily
cause the fl ue gas to be expelled into the surrounding
ambient air
Underfl oor heating
For appliances with underfl oor heating, it is possible but not
necessary to fi t a safety thermostat onto the underfl oor heating
outlet. For the electrical connection of the thermostat see the
section on “Electrical connections - page 25”.
If the outlet temperature is too high, the boiler will stop both
domestic hot water and the heating production and the error
code 1 16 “fl oor thermostat contact open” will appear on the
display. The boiler will restart when the thermostat is closed
during automatic resetting.
If the thermostat cannot be installed, the underfl oor heating
equipment must be protected by a thermostatic valve, or by a by-
pass to prevent the fl oor from reaching too high a temperature.
0
1
2
3
4
5
6
0 100 200 300 400 500 600 700 800 900 1000
[mCE]
18/24
30
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
0 100 200 300 400 500 600 700 800 900 1000
1100
[mCE]
[l\h]
24
30
38
I
CLAS HE EVO
CLAS HE EVO SYSTEM
