Motors and drives are the longtime workhorses of the HVAC industry. These devices work long hours in tough conditions without complaint. And today’s motors and drives are not only tough, they’re smarter than ever and designed to enhance the comfort of indoor environments while operating at ever-higher efficiencies. Here’s a look at some of the latest motor and drive products now available on the market.


I just can’t say enough about an app that has become an essential part of my life and the overall operation of our HVACR service team.

I am talking about EVERNOTE. It is one of the best ways to assemble, organize and present information that I have ever seen. Now you may be thinking that I am compensated for endorsing this product but you are wrong. I am compensated by using the product. I use it for training purposes as well. It has a great presentation mode that I use instead of powerpoint slides.

I use it many times per day. It is extremely useful when we have our weekly service huddle meeting.

Below is a screenshot sampling one of our huddle meeting frameworks.

You can easily hyperlink the topics to other notes that have been organized into specific Notebooks.

We also have the essential Notebooks shared with all the service techs. It is feature-rich and the beauty is that it syncs across just about all platforms.

An example list of our company shared Notebooks contain the following topics: Work Data, Parts Information, Site Information, Memos, Policies, Training, etc. In these Notebooks are contained over 500 notes and training presentations. It is easily searchable for specific notes inside these Notebooks.

As we go throughout the week and run across some useful topic to discuss or encounter a recurring issue, we add it to the list for “Monday” and we keep the team informed. It helps us to maintain a near-paperless approach to our day to day business practices. For all our larger digital files that contain operation manuals and other manufacturer information, we use Box, which contains over 12GB of technical information for our team to access.

My wife and I both have the premium version and use it for all our financial paperwork and household business. Click here to for a free trial of Evernote.


HCFC-22 can present problems as a low temperature refrigerant because under some conditions the internal compressor discharge temperature exceeds safe temperature limit for long term stability of refrigeration oil.

The Demand Cooling System uses modern electronics to provide a reliable cost effective solution to the problem of high compression ratios.

The Module (pictured above) uses the signal of a discharge head temperature sensor to monitor discharge gas temperature. If a critical temperature is reached, the module energizes an injection valve which meters a controlled amount of saturated refrigerant into the compressor suction cavity to cool the suction gas. If for some reason, the discharge temperature rises above a preset maximum level, the Demand Cooling module will turn the compressor off (requiring a manual reset) and actuate its alarm contact.



Model 250A is an auto ranging voltage monitor designed to protect 3-phase

motors regardless of size. It is used on 190-480VAC, 50 to 60 Hz motors to

protect the motors from damage caused by single phasing, low voltage,

phase reversal, voltage unbalance, and also high voltage. Added features

include the DPDT contacts that are used to perform two functions when

parameters are exceeded in addition to the standard adjustable restart delay.