Defrost Termination Temperature & Pressure Setting, Defrost Override Protection for Food Cold Room

Defrost Termination Temperature & Pressure Setting, Defrost Override Protection for Food Cold Room

Improper defrost parameters cause overheating or incomplete melting; Xiteliduo gives standard setpoints and safety interlock logic for cold storage. Cold storage refrigeration compressor stops cooling during defrost; electric or hot gas defrost melts frost accumulated on evaporator fins. Semi‑hermetic piston compressor matched food cold room electric defrost termination temperature is 12–15°C, with a maximum defrost duration limit of 25 minutes. Refrigeration compressor for food cold room must avoid over-defrost; room temperature rise will threaten food storage safety and increase load after pull‑down. R404A piston refrigeration compressor hot gas defrost uses pressure termination; typical stop pressure is 6.5–7.0 bar gauge for evaporator side. Low temperature cold storage compressor and 2‑stage piston refrigeration compressor blast freezers use shorter defrost cycles and stricter time guard limits. Chinese refrigeration compressor manufacturer test data shows uncontrolled over-defrost increases daily energy consumption by 21%. Semi‑hermetic compressor price comparison does not include advanced defrost controller; basic models only use simple fixed timer defrost. Refrigeration compressor fault troubleshooting for slow pull‑down after defrost checks termination sensor position, defrost heater leakage and drain line icing. Cold chain refrigeration unit compressor skids add dual protection: temperature termination plus hard time override to prevent endless defrost. Defrost sensor must be mounted on evaporator fin, not on suction pipe; pipe temperature cannot represent coil frost melting status. Xiteliduo emphasizes drain pan heating trace is mandatory; melted frost water refreezing blocks drain and floods the evaporator compartment. Defrost interval should be adjusted according to humidity; high-humidity processing rooms need shorter defrost intervals. After defrost, a drain delay of 90–120 seconds is reserved before fan restart to blow residual water out of the coil.

FAQ

1. What is the standard electric defrost termination temperature? 12–15°C coil termination temperature for electric defrost.
2. What is the maximum hard time limit for one defrost cycle? 25 minutes maximum defrost duration time override.
3. What is the typical hot gas defrost termination pressure for R404A? 6.5–7.0 bar gauge evaporator pressure for hot gas defrost stop.
4. How much energy waste comes from uncontrolled over-defrost? Over-defrost increases daily energy consumption by roughly 21%.
5. Where should the defrost termination sensor be installed? Directly on evaporator fins, not on suction piping.
6. How long is the drain delay before fan restart after defrost? 90–120 seconds drain delay for water runoff.