Refrigerant Takes Aim At Ice Machines

July 2, 2004
/ Print / Reprints /
/ Text Size+
Ice machines have been affected by the revolution in refrigerants, as have many other HVACR products and components.

For years, they ran on such CFCs as R-12 and -502. With the phaseout of those refrigerants, however, manufacturers moved to a variety of interim HCFC blends. At first, those blends were identified by manufacturer nomenclature (i.e., MP39, HP80, and HP81), but then they became identified by ASHRAE designations (R-401A, -402A, and -402B). R-401A is a mix of R-22, -152a, and -124; the latter two each have R-125, -290, and -22 in slightly different percentages.

The arrival of HFCs found the ice machine market quickly embracing R-404A (a mixture of R-125, -143a, and -134a) on most medium- to large-tonnage equipment; R-134a was used in smaller models.

ICOR conducted tests with a reach-in freezer to see if using One Shot would improve efficiency.

Still Evolving

The story does not end there. There are always those trying yet another refrigerant or two to see if the ultimate issue - better efficiency - can be achieved.

Consider the technical people at ICOR International in Indianapolis. One refrigerant they feel strongly about is an HFC marketed as One Shotâ„¢, which, at the time of this writing was awaiting ASHRAE designation and safety classification. The refrigerant can be used for "system performance gains with minimal, if any, system changes," said Jim Terry, manager of Engineering Services.

In low- and medium-temperature applications, Terry said the refrigerant can be considered as a replacement for R-402A, -402B, -404A, -408A, -502, and -507A; it also can be looked at as a replacement in low-temperature systems that have been running on R-22.

To examine the refrigerant's possible use in an ice machine, a new, water-cooled ice machine was brought to the Indianapolis R&D center. The machine is listed by ARI as being capable of producing about 800 pounds of ice in 24 hours, and was charged with R-404A by the manufacturer.

Ice production and power consumption data were measured at three condensing temperatures for both refrigerants. R-404A data was used as a baseline.

According to Terry, "At 100 degrees F condensing, the power consumption with One Shot was 3 percent less and 720 pounds more ice were produced over a 30-day period. At 110 degrees condensing, power consumption was 5 percent less and 900 pounds of additional ice were produced over a 30-day period. And at 120 degrees condensing, the power consumption was 6 percent less and the ice produced was 1,080 pounds more over a 30-day period."

"The unit ran with an open bin and operated continuously," noted Jamey Hale, ICOR technical support supervisor. "In real life, the unit would cycle off/on at the bin switch. Quicker bin recovery means more time off, increasing the power savings even more."

One Shot refrigerant is used with an ice machine as ICOR experiments with using the refrigerant as a means to improve efficiency.

Freezer Findings

The engineers then decided to perform similar research on a reach-in freezer that had R-404A installed at the factory. They conducted tests on power consumption during pulldown, comparing One Shot with R-404A and -507A (the latter is a blend of R-125 and -143a).

The reach-in freezer was operated to determine the lower temperature achieved and the power consumed during a continuous operation test over a fixed period of time, Terry indicated. The condenser ambient temperature was 70 degrees. At the beginning of each test, after a 24-hour soak, the interior starting temperature was 68 degrees.

The freezer was charged at spec plate weight with R-404A and -507A, and at 109 percent of the spec weight with One Shot. The original POE oil charge was utilized. The system maintained a three-eighths level in the sight glass throughout all tests, according to the engineers.

"After 150 minutes of testing, One Shot has 4 percent less power consumption than R-404A and 3 percent less power consumption than R-507A," said Terry. "In the same amount of time, [it] achieved 11 percent colder temperature than R-404A and 4 percent colder temperature than R-507A."

Terry said the oil was then changed to a mineral oil (3GS). After three flushes, the system achieved 97-percent oil concentration. "The system was then operated with varying loads, achieving different levels of coil frost, from light to blocked coil."

He said the unit had one defrost per day. "The thermostat was jumped for continuous operation and has been operating in excess of 60 days. The oil has not varied from the three-eighths level."

For more information, visit

Publication date: 07/05/2004

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

Recent Articles by Peter Powell

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



Image Galleries

2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.


NEWSMakers: Mark Satterfield

Mark Satterfield, founder and CEO of Gentle Rain Marketing Inc. and author of “The One Week Marketing Plan” talks about his book and the importance of HVAC blogging. Posted on Sept. 19.

More Podcasts


NEWS 09-15-14 cover

2014 September 15

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Venting R-22

The NEWS reported that a man received prison time for venting R-22. Should EPA step up enforcement?
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