Carrier’s Newest RTU Option – Dual Stage Relief Economizer

The patented and exclusive Dual Stage Relief Economizer is designed to provide all the functions of the typical air economizer while adding additional means to relieve building air pressure through the rooftop unit when required. All of this is achieved without adding an additional power exhaust system or a special central exhaust fan system and their related electric power source.

Dual Stage Relief Operation:

The 1st stage of natural relief is through the new dedicated air
chamber, and will provide relief when the building pressure
warrants regardless of the economizer damper positions or the
indoor fan status. A separate relief duct, must be installed in the return
opening in the curb.

The 2nd stage, which is the conventional natural relief of the
past, provides additional pressurization relief when the outside
air damper is mostly open and space pressure warrants.

See attached product data.

S&P Spun Aluminum Centrifugal Power Roof Ventilators

S&P has announced its new direct drive spun aluminum centrifugal power roof ventilators. These fans were designed with efficiency in mind to make available smaller models and motors to better meet the needed performance. This new centrifugal spun aluminum line delivers wider performance ranges and unit sizes.

Key Benefits: 

  • Save $ by using less energy to meet the same performance levels
  • Save $ by choosing the smallest motor to get the job done

 Model SDBD – Downblast Direct Drive Roof Exhauster:

  • Sizes: 6, 7, 8, 10, 12, 14, 15 & 16
  • CFM Range: 40 to 4980
  • Static Pressure: up to 1-3/4″ w.g.
  • Warranty: 5-years
  • Certifications: cULus 705 and AMCA Air and Sound

Model STXD – Upblast Direct Drive Roof Exhauster:

  • Sizes: 6, 7, 8, 10, 12, 14, 15 & 16
  • CFM Range: 55 to 4780
  • Static Pressure: up to 1-1/2″ w.g.
  • Warranty: 5-years for UL 705 models / 2-years for UL 762 models
  • Certifications: cULus 705, cULus 762 and AMCA Air and Sound
  • Roof or wall mounting

For more information click here, or contact your TM or local branch manager.


EnviroSep builds modular chiller, boiler, and pump packages for the commercial and industrial markets. They use high quality equipment and components to create HVAC and process plant solutions that the contractor can then pipe, power, control and start up on site. This reduces costs and risks for the engineer, contractor and owner alike. The plants can be mounted indoors or outdoors, with or without enclosures.

EnviroSep has also introduced the Edge, a software App that allows engineers to create designs, submittals, drawings and all supporting documentation in minutes. The Edge has been available for pump packages for over a year. It will soon be available for boiler and chiller packages. Users of this app will be able to design modular dedicated chiller plants, modular boiler plants and central utility plants to their own specifications.

TEC has invited EnviroSep to Chicago the week of April 20th to demonstrate the Edge to engineers. To schedule a visit please contact your TEC territory manager.

To learn more about EnviroSep, click here.

TEC now offers RAUGEO Geothermal Pipe

TEC has partnered with REHAU to offer RAUGEO Ground Loop Heat Exchange System.

This new offering allows contractors to take advantage of the unique properties and capabilities of a PEXa system.

The RAUGEO ground loop heat exchange system is a high efficiency energy source for both heating and cooling, offering numerous advantages in both installation and long term performance over traditional geothermal systems. The unique design and innovative materials allow the system to capitalize on the earth’s ability to provide and store heat energy. As part of a geothermal heat pump system, RAUGEO offers superior energy savings of up to 70% compared to traditional heating methods.

 RAUGEO System Features:    

  • Pre-fabricated for single or double U-Bend design      
  • Continuous coils up to 520 ft
  • Double U-Bends can increase borehole thermal conductivity
  • PEXa Double U-Bends require 10 – 30% less 
  • borehole footage
  • Recognized by IGSHPA as an acceptable piping system


TEC offers extensive outdoor ground loop design work on all Geothermal and WHSP jobs. For more information contact your TM or local branch.

Geothermal HVAC Systems & their Benefits

Carrier and Bryant recently launched new geothermal product lines. Geothermal HVAC systems have been used for over 60 years in the US and other Western countries, and their use is growing exponentially. While geothermal systems are more expensive to install than ordinary systems, they offer two key advantages. First, they offer significant long-term cost savings. The US Department of Energy has found that they can save the average home hundreds of dollars in utility costs while the system pays for itself in 8 to 12 years. Second, a geothermal HVAC system can be designed to handle multiple needs simultaneously. For example, this kind of system can work to heat water, a pool, and a house all at the same time.   Continue reading “Geothermal HVAC Systems & their Benefits”

New ASHRAE 62.2-2013 Standard Increases Residential Ventilation Requirements

The latest version of ASHRAE Standard 62.2, which is published every three years and is the standard that forms the backbone of most ventilation codes, has some new significant changes.  The first of which is an increase to the minimum mechanical ventilation requirements for residential homes.  The second is a requirement for carbon monoxide detectors.  Click here to read about the updates or click here to download the latest version of the standard from the ASHRAE Bookstore.

New Mobile App: Carrier Chillers

To assist engineers and contractors with the selection of Carrier commercial packaged chillers, Carrier introduces Carrier® Chillers, a new mobile application. In just a few easy steps, users can obtain key technical data and product features for fast and easy specification of Carrier air-cooled and water-cooled chillers, or paired remote air-cooled chillers and condensers.
Carrier created the Carrier® Chillers app to Continue reading “New Mobile App: Carrier Chillers”

New Commercial INVE$T Software Released

This re-designed Carrier Commercial INVE$T v3.0 program will provide payback, operating cost savings, and energy cost savings for replacement, new construction, and sell up opportunities on RTUs and split systems.  It has been updated to include the latest ASHRAE standard guidelines, hourly analysis profiling, plus the addition of Staged Air Volume (SAV™) 2-speed indoor fan motor, two stage compression, ERV’s and Continue reading “New Commercial INVE$T Software Released”