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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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Sheave Maintenance

Routine maintenance of blower sheaves should include a close examination of the alignment of the motor and blower sheaves. Proper belt tension is also important to maintain the life of the sheaves. Groove gauges are often provided by belt and sheave suppliers to test the sheave walls for wear to determine the need for replacement.

Another important item to check is the RPM’s of the blower to determine if it is within the range that was established during commissioning by test and balance personnel or startup technicians. Once the sheaves get a measurable amount of wear, it becomes increasingly difficult to provide the proper air delivery of the blower due to lost RPM’s.

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VIBRATION ELIMINATORS

Rigid connections at the compressor are prone to crack or break from vibration and stress. The cause may be discharge gas pulsation or compressor movement because of high torque.

There is a simple way to prevent line breakage from these causes. Install vibration eliminators in both the suction and discharge lines. They should be the same size as the lines. Install the vibration eliminators parallel with the drive shaft on the compressor. It should only be clamped on one end.

A typical vibration eliminator has rigid copper ends to connect to the compressor and the system. Between the ends is a length of flexible tubing. It is covered with woven brass or stainless steel mesh for strength.

EXCERPT FROM THE TECHNICAL INSTITUTE MANUALS AT THE ONLINE STORE OF RSES, THE HVACR TRAINING AUTHORITY.

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Largest Memphis Area Public Company Employers

Information on The List was obtained from each individual organization through surveys and could not be independently verified. In case of ties, companies are listed alphabetically.


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EMERSON’S REFRIGERATION CONTRACTOR WEEKLY

FOR ALL YOU REFRIGERATION GUYS OUT THERE…..FIND OUT MORE HERE: https://goo.gl/EK8fSA

There is a lot going on in the world of Refrigeration. Electronics, alternative refrigerants and new ways to service equipment. One way to keep ahead of these changes and grow your business is to sign up for Refrigeration Contractor Weekly.


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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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HVAC CONTRACTOR DIRECTORY

Here is a great way to get your company noticed.

REA

READ MORE HERE

 

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ALDI SUPERMARKETS GET EPA RECOGNITION

BATAVIA, Ill., Dec. 11, 2017 /PRNewswire/ — ALDI has received the 2016 – 2017 “Best of the Best” award from the Environmental Protection Agency’s GreenChill Partnership for its use of cutting-edge, environmentally sustainable refrigeration systems in 34 of its stores. READ MORE

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CO2 TRAINING

Co2 refrigerant training today in Brandtford Ontario. 12/13/17 Thanks to our Emerson Canadian team.

 

 

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Working With HVACR Condenser in Cold Climates

Special considerations must be taken when installing condensers in cooler climates. During the colder weather, a winterizing valve should be utilized to maintain head pressure. This valve is actuated by a pressure difference between its inlet and outlet. The figure shows a “Winterstat” brand. Other valves may be used such as a “Headmaster” valve. If system pump-down is a desired feature, the receiver must hold the normal refrigerant  charge plus the condenser charge with the bypass valve operating ̶ that is, partially open or intermittently opening and closing.EXCERPT FROM “TOOLS, CONTROLS AND TROUBLESHOOTING“, available from the ONLINE STORE at RSES.ORG.