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What Is a 75F Health Check?

Aug 14, 2017 9:10:36 AM

You might be able to improve the efficiency of your HVAC system with a renovation and recommissioning, but then you're spending several times more money than you could spend on a smart HVAC retrofit. Additionally, you'll miss out on the benefits of improved system monitoring, scheduling, control and zone customization.

During preliminary surveys of HVAC systems, we often find:

  • Inefficiencies and nonfunctioning actuators on RTUs
  • Heating and cooling coils that have rarely, if ever, been cleaned
  • Oversized rooftop units (RTUs) and other HVAC equipment

This assessment helps us calculate an ROI and payback period if you were to install a predictive, proactive building management system (BMS).

A further step is a system "Health Check." This requires installing our system on a test location. Beyond a health check, we also offer pilot programs of our system to test all variables over a few months or seasons, providing you with a full understanding of our smart BMS capabilities and savings. Pilot programs are available on all building types.

Download your FREE 75F Pilot Program Infographic >>

What Happens During a Health Check?

We perform Health Checks on test locations and periodically for all 75F customers. Health Checks are run overnight, when no one is in the building, so we can test the system's heating and cooling stages and its fan cycles. Additionally, we test with all vents and dampers open (a.k.a. "dumb mode") to see HVAC system performance versus the performance with the 75F solution engaged.

The Health Check provides a full picture of system efficiency, equipment efficiency, air quality, air enthalpy (Btu per pound of air = amount of heat energy in air) and an indoor comfort report. Given a full understanding of your HVAC system performance, we can help you fix issues and improve indoor air and environment quality.

You'll know whether air is passing too quickly or too slowly over heating and cooling coils; whether HVAC equipment is appropriately sized; whether CO2 and NO2 levels are optimal; and whether efficiencies can be increased in any of your HVAC equipment.

Health_check.png

SAT = Supply Air Temperature, RAT = Return Air Temperature
The purple line in the graph above depicts SAT minus RAT during the Health Check.

Health_check_conditioning_rates.png

Health_check_final_airflow_rates.png

When actuators don't function properly, the entire RTU must work harder, which requires significantly more energy than a fully optimized RTU. Most property managers and owners don't know what is actually wrong when the system isn't functionally optimally (or at all), and they may end up making Band-Aid fixes or investing in new systems that aren't necessary. New RTUs are expensive and may not be necessary.

The 75F Health Check can help you gain full understanding of the issues in your HVAC system. Then, in short order with a 3x to 4x faster install than the average retrofit, we can fix the issues while adding the value of cloud computing, Internet of Things (IoT) and machine learning technology that enables the smart building management system of the future, today!

GET A FREE ROI CALCULATION FROM 75F

GET A FREE ROI CALCULATION FROM 75F

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