In the automatic, when the common power supply under-voltage, over-voltage, loss of pressure transferred to the standby power supply. When the standby power appeared in the same failure, converted to double position, display screen will display and alarm automatically at the same time. LCD screen is protecting in the 30 s, on the button for the first time display screen will display, the second time can enter the settings, enter setup requires a password input.
When the artificial set garbled (crash), the reset button reset to set the value of silence.
When the controller is arranged in the automatic, manual position, pressing the control panel double key display double, but not alarm The controller sets delay switching time, when there is a power failure recovery in the value set, dual power supply without switching opposite and switching.