System Pressure - Hermann Habitat 2 23E Owner's Manual

System pressure

Make sure that the system pressure in a cold state is
always between 0.5÷1.5 bar (optimal pressure: 1÷1.5
bar). If pressure is lower, open the filling valve (see
figure) till it reaches a maximum value of 1,5 bar; this
value is checked with the pressure gauge (item 2 in
previous Control Panel figure).
A cold-measured pressure too high could cau-
se the water discharge from the 3 bar safety
valve, after the heating of the system.
Alarms
If the red lockout lamp
signals an alarm, a lockout or a malfunctioning.
Regular FLASHING:
— one of the inner temperature sensors is fault. Call a qualified technician for repairing.
FLASHING with short lightnings:
— the "Hot Water" knob [7] is in a position reserved to the technician:
the knob in a position through the scale
ON - it signals problems that can be normally solved by the user:
— The boiler has been just installed, or works have been made on the gas pipes.
It is normal that the boiler goes repeatedly in Lock Out when the Inlet Gas is mixed
with air. This impedes the correct ignition and then provokes the Lock out. In the
conditions described above, it is necessary to repeat more times the ignition of the
boiler turning the SUMMER/WINTER Knob in the Unlock
lamp turns off.
— The water pressure, shown by the gauge in the control panel, is not sufficient (0,5 bar
or lower).
Restore the correct pressure (optimal pressure: 1÷1,5 bar at cold system) opening
the inlet tap (see "System pressure" paragraph). Do not restore the pressure with hot
system, because when the system gets cold the pressure decreases.
Consider that the pressure, in normal conditions, should not decrease. If this happens,
there is probably a loss in the heating system. Sometimes the loss is so small that it
doesn't leave evident signs, but with the progress of the time it can cause the
decreasing of the pressure.
Also the opening of the manual venting taps of radiators (intentional or unintentional)
makes the pressure decrease. Check that this doesn't happen.
38 User instructions
is on or flashes, it
from I to IIIII.
BOILER BOTTOM VIEW
FILLING
VALVE
or
Position until the red
. Move