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2.10 SYSTEM USE
Before ignition make sure the heating system is filled with water and that the pressure gauge (8, Fig. 49) indicates a pressure of 1
- 1.2 bar.
– Open the gas isolation valve upstream from the indoor unit.
The indoor unit operates automatically according to the settings on the control panel. With no demand for heat (central heating or do-
mestic hot water production) (when combined with a storage tank unit) the indoor unit goes to "standby" function, equivalent to the in-
door unit being powered without presence of flame.
Each time the burner ignites, the relative flame present symbol is displayed (11, Fig. 49) with relative output scale.
"Off" mode
By holding the "
" button down for 8 seconds, the display switches-off and the indoor unit is off completely. The safety functions are
not guaranteed in this mode.
In "Stand-by" and "Off" mode, the appliance is to be considered still live. In "Off" mode, a lit
"dot" is displayed in the centre of the display.
Display operation
The display lights up while the control panel is being used; after a set inactivity period, the brightness drops until only the active symbols
are displayed. The lighting mode can be varied via parameter "t8" in the P.C.B. programming menu.
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