To calculate the size of the heating installation, refer to the
"Available pressure" graph below.
Graph representing the available circulation pump pressure
ΔT20
o
C
Underoor heating
For appliances with underoor heating, it is possible but not
necessary to t a safety thermostat onto the underoor heating
outlet. For the electrical connection of the thermostat see the
section on “Electrical connections - pages 28-29”.
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 “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 underoor heating
equipment must be protected by a thermostatic valve, or by a by-
pass to prevent the oor from reaching too high a temperature.
BEFORE THE DEVICE IS USED, FOR THE
FIRST TIME THE TRAP MUST BE FILLED
WITH WATER.
The siphon is lled with water during
deaeration procedure of the boiler (or heating
system) - see p. 32
Ensure that the siphon contains water; if not, it
must be relled. Open the manual air vent (2)
on the main exchanger until complete lling.
Check again the system pressure on the
pressure gauge.
WARNING!
INSUFFICIENT WATER IN THE TRAP CAN
TEMPORARILY CAUSE THE FLUE GAS TO
BE EXPELLED INTO THE SURROUNDING
AMBIENT AIR
2
0
100
200
300
400
500
600
0 200 400 600 800 1000 1200
mbar
l/h
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