In the last HotMail article, Doc described the steps required to measure single phase voltage. Many HVAC contractors and technicians wrote asking for a similar article detaining how to measure three-phase voltage. So here it is.
Correctly measuring and interpreting voltage is essential to every HVAC professional in the field. In an effort to help field techncial professionals be more accurate, here is a look at the procedures for measuring single-phase voltage.
While HVAC industry standards specifying ventilation rates are coming out of the woodwork, a practical standard describing how to measure ventilation airflows that can be applied in the field is hard to find. Here are some tips.
One question I often hear from HVAC professionals is "Doc, if there was just one thing I could do for each system to improve performance the most, what would it be?" Let's take a look at the answer to that question as it pertains to your specific role in this industry.
For installers, seeking just one thing you could do for every system you install, the answer would be: Assure each return duct installed in an unconditioned space is completely sealed and that the proper duct insulation has no gaps.
For many reasons, HVAC contractors generally believe that energy raters come up short when it comes to testing and diagnosting mechanical systems. Can these two groups ever work in harmony? Indeed they can.
Each HVACR equipment manufacturer provides very specific engineering data that contains the answers to questions you need answered to solve problems you face in the field daily. However, to find the answers you seek, you need to use the specifications for more than knee pads.
For the residential HVAC industry, home performance contracting is exciting, is luring more people into the mechanical systems trade, and is helping to evolve HVAC contractors to new levels of professionalism.
I once got a call from a customer with a lost turtle. Megan was an old high school friend with 4 kids and a three story home. A return duct had been cut into the floor of an upstairs playroom, and the grille was cut into the closet door. The kids left the closet door open and the turtle crawled into the duct and disappeared.
Rob ‘Doc’ Falke has been sharing his industry knowledge and expertise through his technical articles in the Hotmail newsletter for several years. His articles give contractors a ‘hands on’ approach to solving issues like balancing a zoned system to exhaust fan pressure measurement.
Check out the products showcased this month, with fluid-level transmitters, a wireless pressure/temperature sensor, a gas water heater, testers for auto voltage/continuity, direct internet connection, and more!
Air conditioning and related product sales really got heated during the 1960s. Residential HVAC became more accessible for more homeowners, and building owners were having rooftop systems installed on new and existing buildings. Here's a gallery of HVACR advertising from the 1960s.
Commercial, industrial and residential contractors will want to check out these products! Take a look at an air-cooled liquid chiller, dampers, trade professional gloves, air curtains, a water-source HVAC system and hand-held IAQ monitor, just to name a few! Don't forget to click on the manufacturers' link for more info.
New technology allows a current switch to be configured outside of an electrical enclosure and installed on a cold wire, thereby eliminating the need for a PPE suite and preventing arc flash hazard. PPE suits, worn by technicians working in a live enclosure, are often cumbersome and can hinder the installer’s ability to configure an adjustable current switch....More
The NATE Magazine is the official publication of North American Technician Excellence, the nation’s largest non-profit certification organization for heating, ventilation, air conditioning and refrigeration technicians.