How Does A Pump Down Refrigeration System Work

Automatic pumpdown systems do not need a larger receiver since the receiver is designed to hold all of the refrigerant in the entire system and still have a 20 vapor head for safety the compressor will be shut off by the action of a low pressure switch set to open at about 5 to 10 psig.

How does a pump down refrigeration system work. What is a pump down system. A system pump down utilizes a solenoid valve in the liquid line when the system set point temperature has been satisfied the solenoid valve will close. To keep out the moisture and air we use a vacuum pump. The compressor will continue to pump refrigerant into the condenser and or receiver drawing it from the low side of the system.

Last the refrigerant evaporates to a gas then flows back to the compressor where the cycle starts all over. The refrigeration system is a closed system that should have only 2 chemicals inside. There are no hoses to drag around and no fittings to track down. A pump down system simply uses a solenoid valve in the liquid line to isolate the refrigerant in the receiver.

Chillers commonly do a pump down cycle using a solenoid valve before shutting down. Pumping down an ac or refrigeration system to remove refrigerant from an air conditioning system a technician has to perform a recovery and pump down procedure. Air and moisture in the system will cause corrosion and deterioration of the compressor motor windings. This document will ensure that you have a basic understanding of the important concepts and basic steps involved with recovery and pump down.

A dedicated pump out system minimizes use of temporary hoses temporary connections and temporary vessels. All grocery stores have refrigeration systems and these refrigeration systems commonly use the pump down cycle for their systems. Enables safer operation of the ammonia refrigeration system. In operation a pump down control consists of little more than a liquid line solenoid valve a thermostat control and a low pressure control.

Moisture can freeze and block the expansion device. Industrial refrigeration system basics in this video we ll be looking at how ammonia refrigeration systems work starting at the basics to understand how in. This prevents liquid refrigerant from migrating to the compressor while in the off or shut down cycle for the chiller. A dedicated pump out system offers several advantages when performing plant tie in procedures see sidebar.

How is this accomplished. A pump down refrigeration control system is often used in industrial applications. Now in liquid form at high pressure the refrigerant cools down as it flows into the coils inside the freezer and the fridge. The control thermostat opens or closes the valve.