Category: It’s Technical

What is Superheat and Subcooling? The Ying and Yang of Air Conditioning

Together they let you take a peek into the inner workings of the magic known as refrigeration, separately they’re about useless. It seems everyone is fascinated with super heat. They’re quick to add refrigerant if the superheat is “high”, or

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Installation Clearances for HVAC

There are a billion ways to ball up an installation or replacement of HVAC equiptment…give or take a million. Fortunately, one of the most common mistakes is also easily avoidable; setting the unit. From access concerns to performance issues, there’s

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Heat Pump Reversing Valve 101

  The reversing valve; the second most confusing part of a heat pump (Yes, the defrost board still holds first place for the most confusing part) So, what’s the confusion about heat pump reversing valves? The confusion is understandable; a

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Ammonia a 19th Century Solution to a 21st Century Problem ?

sometimes, the answers to the questions aren’t necessarily new. This week Kathy Jackson brought us her thoughts on a new / old solution to an relatively recent issue.

Posted in Cooling, Uncategorized Tagged with: , , ,

Cooling Towers Part 2: Measuring Performance with Range and Approach

There are two terms you need to understand if you want to sound somewhat competent when describing a tower’s performance: Approach and Range. Range is the temperature difference between the inlet water and the outlet water. The formula is EWT

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Cooling Towers Part 1: Basic Concept

One of our devout readers suggested we toss together some posts about cooling tower basics, maintenance, and troubleshooting. My first thought was- Good idea! My second thought was, why didn’t I think of that? Cooling towers are like air handlers

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Averaging Thermistors

From time to time someone asks about thermistor sensor averaging. Typical questions are: Why do I have to use four? Why do they have to be connected in series-parallel? What the heck is series parallel? Have you ever seen a

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Control Board Troubleshooting- The Ins ‘n’ Outs

Electronics work just like you do; they determine what’s happening by looking at inputs like temperature and pressure, and decide what to do based on what they “see”. The only difference between your brain and electronics is you use your

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Control Board Fails

Control Boards rarely fail, they’re usually misdiagnosed or murdered. When control boards do fail it’s normally an output contact failure caused by age or an electrical surge like lightning or a technician shuffling across carpet before touching it. It’s a

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The In (puts) and Out (puts) of Control Boards

A Control board looks at inputs and generates outputs based on the inputs it sees. That’s it. Let’s put this in perspective- Input= you hit your thumb with a hammer. Output= you swear. If the input doesn’t happen (hammer hitting

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