Articles by Joe Marchese

Fractional horsepower permanent split capacitor (PSC) fan motors are one of the most popular single-phase motors used in our industry, and then they fail, technicians must be able to troubleshoot and replace them.

As a refrigeration technician, how important is an understanding of basic mathematical relationships? In my opinion, very important. It makes a technician a better technician.

The next time you’re faced with a choice of whether you should take some extra time and additional measurements, do the right thing. Take the time to do it right and find the true problem the first time.

A thermostatic expansion valve (TXV) is designed to maintain a specific amount of superheat at the outlet of the evaporator. If the superheat value is too high or too low, the TXV may be the cause. However, before deciding the TXV is defective, all other system causes must first be investigated and ruled out.

Verifying a diagnosis will take additional time, but this is time well spent. It will actually save time and money for both the technician and the customer by reducing the amount of callbacks and reducing the replacement of non-defective components on the job. It will also allow the technician to leave the job with peace of mind, knowing he has made a correct diagnosis.

The correct placement and installation of the thermostatic expansion valve (TXV) sensing bulb is important to its overall performance and reliability. An incorrectly installed or placed sensing bulb can lead to several different types of system problems. Here are some general installation concerns and tips to follow when installing a TXV.

All of the components may be operational, but are they adjusted and working properly as a complete system? A professional installation will include a thorough inspection of the system as a complete unit.

The next time — and every time — you’re picking up a replacement part, make sure to take the time to verify that the part you need is the part you received. Always trust, but verify.

One person cannot be an expert in every type and design of refrigeration equipment in the industry, and even the most experienced technicians have questions they need answered. 

Not only do repeat failures take away from the contractor’s profit margin, they also tarnish a company’s professional image. Finding the cause and repairing it not only keeps the customer happy, it keeps the contractor profitable.