Refrigerants

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AHRI Guideline N previously stipulated that specific paint colors be used for refrigerant containers as an additional means of refrigerant identification. However, with the increasing number of refrigerants approved for use, there was concern over the potential misidentification of similarly colored containers.

One method of head-pressure control during low ambient conditions is to use a mechanical hold-back or flooding valve located at the outlet of the condenser to hold back or flood liquid refrigerant in the condenser. This valve is often referred to as an open on rise of inlet (ORI) valve because it will start to throttle open on a rise in condenser pressure.

Despite the long-term energy savings and environmental benefits natural refrigerant systems offer, their higher upfront costs remain a primary barrier to retailers’ widespread adoption of these technologies.

The U.S. Environmental Protection Agency (EPA) has recognized 13 companies in the supermarket industry for their achievements reducing emissions of refrigerants. EPA said the awardees are preventing refrigerant leaks, transitioning to climate-friendly refrigerants, and using advanced refrigeration technologies.

This recovery machine has horizontally opposing twin cylinders and twin condensers. A permanently lubricated, bearing-line crankcase is isolated from the refrigerant, which eliminates bearing contamination. 

One common access valve initially used is some type of saddle valve. These valves are convenient and generally easy to install, but they are not usually considered to be a long-term type of valve and generally should not be left on a system permanently.