Category: It’s Technical

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

Posted in Controls, It's Technical Tagged with: , ,

Introduction to Electronic Control Troubleshooting

    If you don’t know how to troubleshoot electronics you’re job is in jeopardy. Heating and cooling equipment with integrated electronics is here to stay; it wasn’t a fad, it’s not limited to “high-end” equipment, and it’s not going

Posted in Cooling Tagged with:

Causes of High Space Humidity (In no particular order)

There are six primary causes of high space humidity.

Posted in Air Side, Cooling, It's Technical, Tricks & Tips, Uncategorized Tagged with: ,

Evaporator Coils Part 2: Multi-Circuit Coil Staging

  Questions: You have a two stage coil; what coil section is first stage? What coil section is second stage? Does it even matter? Answers: It depends. It depends. Most of the time. Face-split, row-split or tube-split; they need to

Posted in Air Side, Cooling, It's Technical Tagged with: ,

Evaporator Coils Part 1: Multi-Circuit Coil Types

There’s more to a evaporator coil than most realize.

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Do Your Duct Plenums Blow? (Some Pun Intended)

What do frozen DX coils, tripped furnace limits, failed ECM motors, failed heat exchangers, and failed compressors all have in common? Answer: Probably poor plenums. Before you say to yourself; “Self, I don’t need to read this; I know how

Posted in Air Side, It's Technical Tagged with: , , ,

Calculating Cooler Chilled Water Flow with a Thermometer

Tools you’ll need Thermometer Calculator Formula Brain

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Refrigerant R410a is Here to Stay

It’s time to accept R-410A as the new R-22 (at least for now) It may be hard to believe, but there are still technicians who think of R-410A as that “new fangled refrigerant with the crazy-high pressures that the ‘Man’

Posted in Cooling, It's Technical, Uncategorized Tagged with: , ,

Control transformers: Watt’s a VA?

It’s 4:50pm. The unit you’re working on has a blown control fuse. The supply houses close in 10 minutes, and it’s 20 minutes away. You scour every shelf, box, and bin in your truck looking for the ever elusive 3amp

Posted in Controls, It's Technical, Uncategorized Tagged with: , ,

Heat Exchanger Failure # 4 – Firing Rate.

How can firing rate affect heat exchanger longevity? If the firing rate is too low, its that same as having low return air temperatures (RAT). Condensation will form, mix with the flue gas and cause corrosion. A high firing rate

Posted in Heating, It's Technical Tagged with:
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