Digital Manifold Aids Diagnostics

June 3, 2004
/ Print / Reprints /
/ Text Size+
The Digital Refrigeration System Analyzer (DRSA) from Digi-Cool Industries.
In order to service today's HVACR systems, technicians need to use more sophisticated procedures. With the added emphasis on reclaiming refrigerant and energy efficiency, technicians have more complex jobs than ever. The variety of refrigerants on the market further complicates the job because of their different pressure-temperature (PT) characteristics and less familiar failure modes.

Technicians need to verify superheat to ensure compressors are operating well. (See related article by John Tomczyk, "Understanding Superheat," in this issue.) Subcooling is also important to check, especially for newer refrigerants like R-410A, to verify that the condenser is performing as designed. Both superheat and subcooling usually require several measurements, PT tables, and math by the technician. There is potential for error.

At the same time, many faults may be difficult to detect with traditional tools. A thermostatic expansion valve that is hunting slowly and fluctuating over several psi is very difficult to isolate using a needle or purely digital pressure gauge.

One Solution

The Digital Refrigeration System Analyzer (DRSA) from Digi-Cool Industries of Duncan, British Columbia, Canada. The instrument is designed to replace analog gauges on most service manifolds. It is said to show pressure symptoms clearly, facilitating more accurate diagnosis, according to the company.

The product displays small changes from the digital readings, with 1/4-psi resolution on the low side and 1-psi resolution on the high side. The company said the display reveals early warning signs for many faults.

Also, the analyzer automatically calculates saturation temperatures based on detected pressures for refrigerants stored internally, eliminating PT chart calculations. It also indicates vacuum in mercury (Hg) "for a rough reading during routine service."

Advanced Features

The product can be used indoors and outdoors, the company said. The case is said to resist impacts, typical oils, acids, and sun exposure.

The DRSA-1100 comes with a pipe-mounted temperature probe. It performs superheat/subcooling calculations automatically for 22 refrigerants and can be upgraded for additional refrigerants, the company said. It also tracks pressure minimums and maximums, which can be used when setting pressure controls.

According to the company, this new model is an improvement upon the BTD-1000 released last year. The BTD-1000 remains available without the temperature probe and max/min pressure monitoring feature. It retains the bar graph for pressure dynamics and the claimed ±0.5 percent accurate digital display. Bubble and dewpoints are shown for 16 common refrigerants.

Publication date: 06/07/2004

Did you enjoy this article? Click here to subscribe to The NEWS Magazine

You must login or register in order to post a comment.



Image Galleries

2014 MCAA Annual Convention

Scenes from the 2014 MCAA Annual Convention in Scottsdale, Ariz.


NEWSmakers: Julian Scadden

Training is an ongoing process. Julian will discuss how you can generate maximum return on time and energy invested training by following a three part process. Listen to this podcast to get expert tips on training, tracking and follow up. 

More Podcasts



NEWS 04-14-14 cover

2014 April 14

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe


Which statement on service calls best applies to your business?
View Results Poll Archive


2014 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research


Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


Magazine image
Register today for complete access to Get full access to the latest features, Extra Edition, and more.


facebook icontwitter iconyoutube iconLinkedIn i con