Superheat is the temperature of refrigerant gas above its saturated vapor (dewpoint) temperature. Superheat as it relates to thermostatic expansion valves, can be broken down into three Superheat...

A common problem facing refrigeration and air conditioning service technicians and contractors is that of superheat hunting by thermostatic expansion valves (TEVs). Here is a better understanding of a...

This is the third part of a three-part series of posts on high-glide refrigerants for refrigeration system retrofits. Part 1 covered calculating super-heat and subcooling with glide, and control of...

This is the second part of a three-part blog series on high-glide refrigerants for refrigeration system retrofits. Part 1 covered calculating superheat and subcooling with glide, and control...

Refrigerant choices for refrigeration systems are undergoing significant change, including choices for retrofits and new systems. This article is Part 1 of a 3 part series addressing such retrofits,...

What if you are only given 3 measurements? As HVACR technicians, you need some ideas in your back pocket for basic troubleshooting in a refrigeration system. How about a simple chart that helps you...

Below are six questions that will help you learn most of what you need to know about flooded head pressure control.   1. Why do you need a receiver? The flooded head pressure control valve maintains...

A solenoid valve with a built-in check valve is designed to replace a liquid line solenoid valve in parallel with a check valve for reverse flow. This valve may be applied in the liquid line of...

In order to understand the principles of thermostatic expansion valve operation, a review of its major components is necessary. A sensing bulb is connected to the TEV by a length of capillary tubing...

It is important to locate a filter-drier in a refrigeration system. Its role is to remove moisture from the refrigerant and lubricant by absorbing and retaining moisture deep within the...

When responding to a refrigeration service call at a supermarket, the refrigeration technician immediately plays “problem percentages” upon entering the store. Most refrigeration equipment breakdowns...

​To ensure peak performance, solenoid valves must be selected and applied correctly; however, proper installation procedures are equally important. Aside from correct installation, troubleshooting the...

We all know that a properly charged refrigeration system utilizing a receiver must have a liquid and vapor interface in the receiver. And we also know that saturated pressure and temperature...

In air conditioning and refrigeration applications, the ability of the thermostatic expansion valve (TEV) to match refrigerant flow to the rate at which refrigerant can be vaporized in the...

All refrigeration piping materials are subject to changes in temperature and will expand and contract with temperature change. Installation techniques must allow for expansion and contraction changes,...

Parker's HVACR Tech tips cover service tips for the HVACR technician servicing commercial refrigeration systems as well as  HVAC  for both commercial and home. The following are service tips for...

Many refrigeration compressors break down simply because they overheat. There are two main reasons why overheating can have such a devastating effect on compressors: Loss of the lubricating properties...

Have you considered a CDS valve conversion for improving performance and reducing costs on your refrigeration equipment? Over the past ten years, Parker Sporlan has completed tens of thousands of...

Head pressure control on supermarket refrigeration systems is used to maintain a minimum high-side-pressure to low-side-pressure relationship. Low side pressures are the result of...

Manufacturers of refrigerants, controls, and other suppliers distribute hundreds of thousands of pressure-temperature charts to the trade every year. It would be rare indeed to find a...