When it’s time to provide your customer's preventive maintenance
don’t forget to pay particular attention to system components that
are out of sight within the system cabinet or air handler
On July 12, 2018
Cleaning air conditioner condenser and evaporator coils is a basic
need for proper system maintenance. In fact, it is probably the
number one performed maintenance task by air conditioning...
On July 2, 2018
Here is some information concerning refrigeration oils that every
HVACR technician will find useful. Oil types Mineral – a by-product
in the distillation of crude oil to produce gasoline. Mineral...
On June 19, 2018
Most supermarket refrigeration equipment breakdowns are repeat
problems. When responding to refrigeration service calls at
supermarkets, refrigeration technicians immediately play...
On June 5, 2018
A large percentage of compressor failures in low-temperature
vapor-compression refrigeration system applications originate from
overheating. Typical compressor capacity rating data is based on...
On May 15, 2018
Monitoring the acid level in a refrigeration or air conditioning
system is of the utmost importance. Contaminants such as water and
air are important factors in the formation of acids in the...
On April 10, 2018
Here is information on Psychrometrics that should help remind the
HVACR technician what this subject is all about... with perhaps a
few tidbits the tech may not have known! Psychrometrics: the...
On March 13, 2018
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
In 2017, many changes impacted the HVACR, HVAC climate control
industry. New technologies emerged that changed the way we do
business – most for the better! But they also brought a shift in
the way we...
On January 11, 2018
The HVACR service technician uses an array of tools and test
instruments to diagnose problems and evaluate system
performance. One tool that is readily available, inexpensive
and yet rarely used to...
On November 15, 2017
The Suction Line Filter-Drier method of cleaning up a system after
a hermetic motor burnout is favored by service technicians and
recommended by manufacturers throughout the HVAC and...
On August 1, 2017
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
When designing a system using stepper motor style electric valves,
such as CDS or SDR valves and A8-to-CDS conversion kits, in head
pressure control applications additional precautions and...
On November 19, 2016