Panel instructions
1. PV: Current temperature.
2. SV: Set Temperature
3. HD: Heating Differential
4. CD: Cooling Differential
5. AL: Low Temperature Alarm
6. AH: High Temperature Alarm
7. DP: Time of Compressor Delay Starting
8. CA: Temperature Calibration
9. : Setting Mode
10. : Cooling Mode
11. : Heating Mode
12. Csp: Cooling Start Point, Csp=SV+CD
13. Hsp: Heating Start Point, Hsp=SV-HD