Question 131Refrigeration & AC - QMED

The correct answer is A) cylinder unloader. A cylinder unloader is a device used to hold open the refrigeration compressor suction valve during starting. This reduces the compression load on the compressor, making it easier to start and reducing the initial power requirement. This helps prevent damage to the compressor during the starting process. The other options are incorrect because: B) a discharge line bypass is used to reduce the pressure on the compressor discharge side, C) a suction line bypass is used to reduce the suction pressure, and D) a relief valve is used to release excess pressure in the system, not to assist with compressor starting.