5 Features to Look for in New Rooftop Units

March 22nd, 2017 | Comments (0)

Are you ready to update your out of date rooftop unit? Consider upgrading to an energy efficient unit which can not only reduce your costs, but also improve your level of comfort. Many older units are inefficient, especially after being exposed to the elements.

Here are 5 features to look for in today’s high-performance features:

1.) Variable speed condenser and blower fans that regulate airflow based on space conditioning needs. Heating and cooling loads vary, but motors run at a constant speed. Fan motors equipped with variable frequency drives can adjust speed to match load requirements, which saves energy and puts less stress on system components.

2.) Electronically commutated motors (ECMs) are efficient and use about half of the energy of conventional motors. ECMs have variable speed control which allows a rooftop unit to maintain the proper airflow and a constant temperature. They run at low speeds for long periods of time which saves energy and proves humidity control.

3.) Inverter drive compressors modulate to match the load, instead of cycling it on and off which improves temperature control and reduces noise. The soft-start capabilities of inverter drive units reduce equipment stress, allowing for less maintenance and a longer lifespan.

4.) Electronic expansion valves improve temperature control while also protecting the compressor from the liquids in the refrigerant that can cause premature failure. This valve increases unit efficiency by lowering head pressure.

5.) Fault detection and diagnostics technology is built-in on a growing number of high-performance models. These units measure airflow, pressure, temperature, compressor operation and other key system functions. When a change indicates a component fault or performance issue, the device generates an alarm and lists probably causes, which helps reduce maintenance costs and minimize downtime. Some models can also integrate with existing building automation or energy management systems for remote monitoring and control.

Helpful tip:

Make sure your new unit is Energy Star certified and Ashrae 90.1 compliant. Energy Star models are up to 10% more efficient than standard units. Ashrae 90.1 compliance means that the system meets or exceeds the requirements of this widely used building energy code.


To read this article from PSG&E in full, click here.