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Technical Tips

Hey Ed, What’s the Difference Between Manual J® and Manual JAE®?

In this edition of “Hey Ed”, Ed discusses the difference between Manual J® and Manual JAE®

Hey Ed, Can We Use the Acronym ECM to Describe All Electronically Commutated Motors?

In this edition of “Hey Ed”, Ed discusses if you can use the acronym ECM to describe all electronically commutated […]

Hey Ed, What Is the Difference Between Taking Static Pressure Measurements on a New Versus Existing System?

In this edition of “Hey Ed”, Ed discusses the difference between taking static pressure measurements on a new versus existing […]

Solving the Solvent Conundrum

Have you ever considered flushing your line sets? Or are you currently? In this month’s blog, we will cover some options that will determine when to make pigs fly.

New Efficiency Ratings (SEER2) – Getting it Wrong

Bottom Line: The US Department of Energy (DOE) has new efficiency standards (SEER2, EER2, HSPF2), effective January 1, 2023. Unfortunately, these […]

Hey Ed, What Can I Do if I Cannot Find the Filter’s Performance Data?

In this edition of “Hey Ed”, Ed discusses what you can do if you cannot find a filter’s performance data

We Win!!

Bottom Line: NFPA exempts ALL outdoor HVAC from NEC GFCI protection until September 2026.  The Details: An August 26, 2022, […]

Hey Ed, Does It Matter Where I Take My Supply Air Measurements for Discharge Air Temperature or Relevant Humidity?

ACCA Member Ed Lehr Testifies for You!

ACCA member Ed Lehr testified earlier this month at the NFPA Standards Council’s hearing in Boston. Lehr testified in support of appeals submitted by ACCA and other organizations regarding the National Electrical Code (NEC). The appeals were to urge the Council to fix a bad code change by expanding the current exemption to cover all outdoor HVAC equipment from the NEC requirement for GFCI protection.

Impending Electrification

It’s coming, and I will simply say we can do this. Electrification is not going to be easy though. I […]

Hey Ed, Can I Estimate Latent Capacity Based on the Water Coming Out of the Drain?

In this edition of “Hey Ed”, Ed discusses if you can estimate latent capacity based on the water coming out […]

Hey Ed, Can I Use Different Outdoor Design Conditions if I Live in a Heat Island?

In this edition of “Hey Ed”, Ed discusses if you can use different outdoor design conditions if you live in […]

Indoor Coil Pressure Drop – “Where’s the Heat?”

Last month, we discussed the pressure drop from a filter. This month, it’s all about the pressure drop from an indoor coil. We’ll discuss what it should and shouldn’t be, and most importantly, we’ll talk about going by the book instead of making things up.

Hey Ed, Why Do I Have to Use the Indoor Design Condition 75 Degrees Fahrenheit at 50% Relative Humidity for Summer Cooling?

In this edition of “Hey Ed”, Ed discusses why you have to use the indoor design condition 75 degrees fahrenheit […]

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