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ONE CAUSE FOR ICED-UP EVAPORATORS

In the HVACR world, it is not impossible that the designers of a walk-in cooler/freezer to mistakenly chose the wrong FPI (fins per inch) selection for the application you are servicing. Here is a table to reference when you are looking at possible causes of an iced-up coil. With fin spacing too close, frost can easily bridge the gap and quickly reduce air flow through the evaporator.

The proper selection of fins per inch plays a role in maintaining proper humidity levels in the conditioned space as well. The bottom line is this: don’t always assume that the application engineer can’t make a mistake in the selection process. Always look at this factor when troubleshooting your HVACR evaporator problems.

EXCERPT FROM Technical Manual Series available at the ONLINE STORE at RSES.ORG, your HVACR training authority.

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TESTING AIR FLOW IN SUPERMARKET CASES

One of the ways to assure that a customer’s case is performing as it should is to test the airflow. One of the best ways to do this is with a test instrument that measures feet per minute as illustrated.

Be sure to measure the airflow at the case discharge air outlet as illustrated below:

The manufacturer recommends that the best time to measure the case airflow is during the warmest time during defrost as the case cycle is terminating.

Below is a manufacturers chart detailing an example of a case specifications including the case design average air flow. Without the proper air flow, the case temperature will not reach the desired set point and the product integrity will suffer.


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Indoor Air Quality Begins Here

The final factor in evaluating the air distribution in a space is the comfort of the occupants. In general, a person is thermally comfortable when body heat loss equals body heat production. What most people call a “draft” is simply a slight movement of air that results in a local feeling of “coolness.” It has been determined that a velocity change of 15 ft/min has about the same effect on comfort as a 1°F of temperature change. KEEP READING BELOW…..

A typical room air distribution system with local air velocities of less than 40 to 80 ft/min will satisfy 80% of occupants. Localized air temperatures should be less than 2°F below the general room temperature. The temperature near the floor should be less than 4°F below that at about shoulder height. For heating, local air velocities generally are below 40 ft/min. For cooling, local air velocities should be between 40 and 80 ft/min.

EXCERPT FROM “THE TECHNICAL INSTITUTE MANUALS,” available from the ONLINE STORE AT RSES.ORG

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RSES Offers HC Training, NATE Testing at the 2018 AHR Expo

Rolling Meadows, Ill. (Dec. 21, 2017) – RSES will be an active player during the 2018 AHR Expo being held in Chicago on Jan. 22–24, 2018 at McCormick Place in Chicago.
In addition to residing at booth No. 4443 during the show, RSES Region 2 Director Art Miller, CMS, RCT, will be presenting “Hydrocarbons as Refrigerants and Alternatives to HFCs” on Monday, Jan. 22 from 8 a.m. to 12 p.m. in room S103D. This free session will review HC regulations and standards, refrigerant properties and safety, including the alternatives HFC-32 and HFOs, system component compatibility, servicing procedures, the refrigeration cycle and cylinder storage and transport. No registration is required. READ MORE HERE
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RSES ADDS SECTION 609 CERTIFICATION TO EXISTING 608 CERTIFICATION

One of the U.S. Environmental Protection Agency’s many duties is to oversee programs that protect the stratospheric ozone layer. Section 608 and 609 of the Clean Air Act enforces activities that protect the ozone layer as they apply to refrigeration and air conditioning systems. READ MORE

Save time and take the test online! The 609 examination is an open book test that can be taken online for $20 with immediate results. Persons who pass the open book exam are awarded: a wallet ID card and a wall certificate.

 Click here to download a copy of the free study guide.

 Click here to take the exam now!

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Supermarkets | Danfoss

In the market of reliable and highly efficient food retail and supermarket refrigeration systems, Danfoss is the solution. Our components are designed to provide the lowest total cost of ownership, while at the same time reducing the carbon footprint of supermarket refrigeration systems. READ MORE

Danfoss is a leading supplier within food retail With our ADAP-KOOL solutions we ensure food safety and energy efficiency in all food retail applications,

Source: Supermarkets | Danfoss

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Things Every Contractor Should Know about Their Supply Partner |  ACHRNEWS

The contracting business revolves around three things: customers, trained workers, and a dependable source of materials. Take any of these away, and the business is doomed to fail. Each of these requires ongoing care and attention. A quick search of this publication’s website points to literally thousands of articles associated with finding and acquiring customers. Similarly, the important subject of employee training and retention gets the coverage it deserves. However, there is only a modest amount about the “care and feeding” of the supply side of the business. READ MORE

Source: Things Every Contractor Should Know about Their Supply Partner | 2017-11-27 | ACHRNEWS

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TECUMSEH’S BOXLOAD.COM – ESSENTIAL TOOLS


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MY LIFE WITH EVERNOTE

I would not know what to do if I didn’t have Evernote to use as a tool for our business. I am the Training Manager for a Commercial Refrigeration company specializing in supermarket refrigeration.
Our service team all have the mobile version on our Android devices. My wife and I both have a premium version to use on mobile as well as our Macs at home.
I share around 10 notebooks with the service techs that have a plethora of information that is crucial to our daily routines, such as passwords, charts, phone lists, store information for each site, remodel notes, etc. Every time I get an email about a particular remodel, I send it to a new notebook that I have created for that remodel store and share it with the tech who handles the daily operations there.
I keep a recurring note called “Monday” where I collect the items that our service team will review when we huddle on Monday mornings to prepare for the week. I keep the bulk of the information in other notebooks and then link it to a bulleted list that we review. Any time during the week that I come across some useful information or think of an issue that needs to be discussed, I just add it to the “Monday” list. It works pretty much flawless.
My wife likes the shared notebook that we share since she handles the finances and every time I use the debit/credit card, I quickly take a snapshot for our shared list so she can always stay on top of our finances.
Yes, Evernote is an essential part of my life and has been for over 4 years. Our company also benefits from the technology and all the service team loves it too.
Attached is a snapshot of my Evernote web with just a few of the many notebooks that I have with nearly 10,000 notes.

 


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ISN’T TECHNOLOGY SOMETHING?