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
On February 13, 2018
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...
On July 24, 2017
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
On June 20, 2017
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...
On June 1, 2017
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
On May 10, 2017
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...
On April 24, 2017
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
On April 4, 2017
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...
On March 2, 2017
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
On February 22, 2017
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...
On September 28, 2016
When responding to a refrigeration service call at a supermarket,
the refrigeration technician immediately plays “problem
percentages” upon entering the store. Most refrigeration equipment
On August 9, 2016
To ensure peak performance, solenoid valves must be selected and
applied correctly; however, proper installation procedures are
equally important. Aside from correct installation, troubleshooting
On July 19, 2016
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...
On July 5, 2016
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...
On June 21, 2016
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
On June 7, 2016
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...
On May 24, 2016
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
On December 17, 2015
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
On September 21, 2015
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...
On April 7, 2015
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...
On July 1, 2014