Arkansas HVACR NewsMagazine March 2021

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using them unless you like troubleshooting communication problems.

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8. Crossed Wiring/Piping: This is a pervasive issue in multi- splits. Installers, it is crucial that you color- code or mark your line sets, as it’s really easy to get them crossed up. If you happen to get them crossed up, any number of complaints can happen. The biggest one is overcooling or overheating of a space. Another one could be getting a condensate fault (especially if the unit has a condensate pump), as the condensate pump is only active when the unit calls for cooling. If you suspect crossed wiring or piping, run each head individually to verify that refrigerant is flowing to the unit that you want. Pick up some phase tape from your local hardware store or electrical supply in several colors. It could save you down the road. In closing, stick to the basics. Mini- splits aren’t as co mplicated as they appear to be. Remember that all circuit boards do is take inputs, apply logic, then produce an output. Remember that poor inputs will create poor output control. Those of you who are old-school programming types will remember GIGO (garbage in and garbage out). If the input from, say, a thermistor is reading incorrectly, the output it’s responsible for controlling (EEV) will not modulate or control correctly. This article is provided by Bryan Orr, creator and founder of HVAC School, podcast, YouTube and Website. We encourage you to subscribe to their Podcast by clicking here.

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