HVACopediaMidea · Mini-split · Startup
Start protection and compressor stop rules
What happens, in order
- First power-up compressor start is held up to 10 s; later restarts wait up to 3 minutes
- Compressor preheats automatically when outdoor sensor T4 is below the setpoint
- Cooling compressor stops when calculated frequency is below the minimum, the 10 minute protection time is over and room temperature T1 is at or below setpoint minus about 2 C
- Heating compressor stops when room temperature reaches setpoint plus about 2 C under the same frequency and time conditions
- Heating indoor fan follows the anti-cold-wind function so cold air is not blown at the start
- Compressor shuts off if discharge temperature stays above 226 F (108 C) for 9 s
- Indoor fan trips the unit if fan speed is below 200 RPM or above 2100 RPM for an extended time
Timings and thresholds
| Item | Value |
|---|---|
| Compressor delay, first start | up to 10 s |
| Compressor delay, restarts | up to 3 min |
| Protection time before stop | 10 min |
| Discharge temperature limit | 226 F (108 C) for 9 s |
Applies to: Midea / Carrier DLFSHB high wall indoor unit
Models
More Midea mini-split sequences
- Defrost mode · Defrost
Related
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Source: Midea-Carrier DLFSHB service manual MS-DLFSHB-01, Operation Modes and Functions. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.