Condensing Units

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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.

In October 2015, hoping to improve the performance and efficiencies of the location’s refrigeration systems, Roche Bros. installed two Trillium Series Condensers in its Westwood store.

Keeping any kind of air conditioning or refrigeration coil clean is important for proper heat exchange, and microchannel coils are no exception. As these types of coils continue to grow in popularity, technicians should know that the microchannel cleaning procedures can differ from those for cleaning standard fin-and-tube coils.

These fan coils offer factory-installed electric heat options as well as flexibility for single-stage demand dehumidification. 

According to National Comfort Institute (NCI) studies of properly performing HVAC systems, coil pressure drop shouldn’t exceed 40 percent of the equipment’s rated total external static pressure.

While making the decision to replace a condensing unit instead of repairing it may be a difficult one, some contractors have guidelines in place to help homeowners make such a decision a little less difficult.

Dozens of regulations affecting HVACR equipment manufacturers, along with refrigerant regulations and technological innovations in variable-speed technology, have resulted in a bevy of change for condenser unit manufacturers.