7
4. Front unit of HDA 5500
HDA5500
MODE
MODE
1
3
2
4
Relais
1 2 3
Sensor
4-digit
display
relais-LED
fhighlighted
for active SP
Sensor LED
highlighted for
active sensor
soft keys to set
sitching and switchback points,
and changing basic settings
display of
physical unit
for sensor 1