1) 3-digit temperature display 12) Enter/Reset button
2) Control unit series 13) Programming / Setting key
3) TRIP (red) LED 14) LED/relay test key
4) ALARM (yellow) LED 15) Modbus RS communication (green) LED (only AD)
5) FAULT (red) LED 16) 3-digit channel display
6) FAN 1 (yellow) LED 17) T-max mode selection (red) LED
7) FAN 2 (yellow) LED 18) Man mode selection (yellow) LED
8) Display mode selection key 19) Auto mode selection (green) LED
9) Fixing block 20) Scan mode selection (yellow) LED
10) UP key 21) Fixing block
11) DOWN key