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Category: Technical Tips

Installing a Dwyer Magnehelic Differential Pressure Gage

https://youtu.be/5qOUUWzHLB0 Get the 2023 Updated post by clicking here. The Magnehelic®, is a test instrument that has been around the HVAC industry for quite sometime..

How NOT To Install RIB Relay

In our continuing efforts to bring to our readers the BEST controls information available we at Control Trends must at times step back and shake

McDonnel & Miller LWCO Switch Malfunctions

The following is a list of what causes a LWCO switch to malfunction taken from the McDonnell & Miller Service Guide.

Setting up VFD's with 4-20 mA controller

This is a good guide for setting up a variable frequency drive with a 4-20 signal, to see how to set up a drive using

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