Refrigeration System Operations and Maintenance

A component in refrigeration systems that removes moisture from the refrigerant using a desiccant material.

A material that absorbs moisture from the surrounding environment, commonly found in filter-driers.

A method used by desiccants to remove moisture by attracting and holding water molecules onto its surface.

A method used by desiccants to remove moisture by reacting chemically with water.

A visual device that shows the flow of refrigerant in a system.

A chemical indicator placed within the sight glass that changes color in the presence of moisture.

A small housing with lenses that allows the observation of refrigerant flow. It can indicate both moisture and insufficient refrigerant.

The process of installing a new desiccant cartridge when the existing one has reached its capacity for absorbing moisture.

The process of adding refrigerant to a refrigeration system to achieve the required operating pressure and refrigerant level.

A valve used to control the flow of liquid refrigerant into the system during charging.

A valve used to regulate the amount of refrigerant entering the system during charging.

A pressure-sensitive switch that stops the compressor if the pressure in the system falls below a set point.

The process of breaking a vacuum by introducing refrigerant gas into a refrigeration system.

The process of opening the liquid line valve to allow refrigerant flow to the evaporator after the charging procedure is complete.

The phenomenon of frost formation on the compressor suction line, indicating overcharging of the refrigeration system.

A component that absorbs vibrations and noise created by refrigeration system components, such as the compressor, evaporator, or condenser.

The connection points where vibration absorbers are typically installed in a refrigeration system, usually near the compressor and on both the suction and discharge lines.

A type of refrigerant distributor used in refrigeration systems, designed to evenly distribute liquid refrigerant to an evaporator.

The material used for piping and tubing in refrigeration systems, selected based on factors like size, refrigerant type, and application.

A standard that outlines minimum requirements for piping, tubing, valves, fittings, and related parts used in mechanical refrigeration systems.

A code that sets forth specific requirements for refrigeration piping and heat transfer components, ensuring safety and functionality.

The transmission of vibrations and noise through rigidly connected piping in refrigeration systems.

The process of reducing noise and vibrations in refrigeration systems by installing vibration absorbers and ensuring proper piping and tubing selection.

The process of returning oil from the oil separators back to the crankcase.

When the compressor is operating, it is acceptable to add oil to the crankcase with a hand pump, provided that the crankcase pressure is not excessive and the compressor manufacturer permits it.

Refrigeration compressors are sealed units, preventing the escape of refrigerant. To add oil, specialized tools like hand pumps and pressure-rated hoses are needed.

If a refrigeration compressor is running out of oil, it needs additional lubrication. Oil can be added directly to the compressor crankcase, which is not straightforward due to the sealed nature of the system.

Before adding oil to a compressor, ensure the ventilation system is running at full capacity to prevent any accidental leaks of refrigerant and oil.

Bull’s eye gauge glasses are used to monitor the oil level in the compressor crankcase. A normal oil level is about half the glass.

Adding oil to a running compressor, especially when the refrigerant is pressurized, toxic, and flammable, involves risks. Specific site procedures and personal protective equipment are crucial for safety.

Refrigerant leaks and oil spray are possible during the oil addition procedure because it involves accessing the compressor crankcase, which contains refrigerant vapor.

Compressor sumps gradually run out of lube oil because it passes through the discharge piping along with refrigerant vapor.

Regularly monitoring the oil level in the compressor crankcase is crucial to ensure proper lubrication.

The process of starting the compressor and allowing it to run at low speed for a predetermined time to allow oil to circulate and reach a suitable temperature before full operation.

A safety feature that prevents the compressor from starting until the oil pump has been operational for a certain duration, ensuring adequate lubrication.

A component that regulates the flow of chilled water to the evaporator, allowing for a precise adjustment of cooling capacity.

A control system designed to monitor and manage building systems, including HVAC, lighting, and security.

The pressure at which the condenser cooling water pump is automatically activated, ensuring adequate heat dissipation.

A device that measures the temperature of the chilled water leaving the evaporator, providing feedback for adjusting the chiller's operating parameters.

The process of gradually increasing the compressor's load by opening the inlet damper or vanes, allowing the compressor to reach full operating capacity.

The amount of torque required to start the compressor, which is reduced by initiating the start sequence in an unloaded state.