Imagine knowing the refrigerant charge was correct on a Central Heat Pump or A/C without attaching gauges! No, I am not referring to the Lennox "Approach" calculation, which I have found to be very unreliable to predict refrigerant charge, but instead using the simple total capacity calculation with the correct tool.…
An acronym for what is synonymous with all that is bad with the American Pastime, Performance Enhancing Drugs (PED's) have been proven to inflate a ballplayer's performance. Most important in contract years, a player's performance is measured in specific statistics. So, what if there was a pill, or cream, that an HVAC Technician or Salesperson could take to inflate their numbers. Make them perform at the top of their field and get them the highest pay in the industry? Would you take it?…Continue
I remember not all too long ago, yes I am still on what I hope to be the first half of my life, that Central Air-Conditioning was a luxury. Like the radio, then the television; next the telephone, and now the cell phone, Air-conditioning has become a necessity. What was before Air-Conditioning? What did the weather people (yes, politically correct here on Excess Air) say to the elderly before they would recommend "staying inside, out of the heat"?
I remember what I used to do…
The easiest way to show a homeowner how their investment in high-efficient equipment will help their wallet is to use the "Simple Payback" Calculation. This 'tried and true' sales tactic will quickly explain how many years before the additional investment to upgrade is paid off. Of course, there are many features that a high-efficient system provides, like superior levels of comfort, wether it be climate control or just condenser noise just outside their children's bedroom. These…Continue
There are not as many contractors out there as you would expect that are current with the most recent, and always updating, residential building code. Particularly when it comes to the sizing limitations for HVAC equipment, most contractors consider this minimum requirement by law nothing more than a nuisance. There is nothing more frustrating to see in a quality control role than a system that was sold, sized, and installed prior to the start of the system design process. Completing a…Continue
I remember a rash of nuisance service calls rolling in on weekends like this, the snowfall being the key part. It is amazing how well prepared a Heat Pump is for cold weather, with safeties, defrost controls, and supplemental heat (in most). Unfortunately, they do not come with windshield wipers to keep the condensers clear of snow, and snow will decrease the airflow across the condenser to a breaking…Continue
There are some opportunities that come along for homeowners that seem to good to be true, and most of your parents and grandparents can tell you if it looks this way it probably is. But, how about quick return on your investment that will continue to save money for the life of your boiler? This is what an outdoor reset control will do for them. Add the feature of a more comfortable home and most people start asking: What is the catch? The catch is the technician needs to not only…Continue
For a technician or auditor that works outside of the Oil Heating Industry, seeing a tank leaking in a basement can send you into a moment of shock. Then of course, the dreaded conversation with the Homeowner will cast a cloud. The key is to have a plan, and know what to do. The smallest amount of knowledge in this subject could make you the hero. Simply stating, "Call your Oil Company!" can leave them feeling helpless. Of course, that oil delivery company must know about a leaking…Continue
After writing last week's post: "High CO Reading, Now What?" it occurred to me that not as many people out there: technicians, raters, or auditors; are up to speed on the age old firing rate calculation. I hope this simple procedure is easily understood as you may find it useful if you are working with negative pressure gas valves, with Energy Star Homes, or just simply forgot your manometer at the shop. I…Continue
This seems to be one of the unluckiest weeks to draw in the on-call pool for a technician. You see, over the Winter you have to respond to no-heat calls much faster than a residence without cooling on Memorial or Independence Day. I remember visiting homes many Festivus evenings and getting the old clunker of a boiler running, without the swears from "A Christmas Story". But, even over the last fifteen years, being on-call has changed. If you were not able to barter your way out of…Continue
I am sure I am not the first to write about this, but it doesn't change expectations of homeowners or trade employers. Why is it that millionaire ball players can be successful batting .300? A pitcher can have thirty starts, win 20 games and could be named for the Cy Young? Or that a successful quarterback can throw 20 touchdowns and 10 interceptions? The reason: they are much better than their peers.
Imagine, as an HVAC Tech, you got the diagnosis correct one-third of the…Continue
Added by Christopher Morin on December 4, 2012 at 7:00pm — No Comments
When using ACCA's Manual T for register selection, there are several basic rules that are followed regarding location. Most guidelines revolve around room air circulation and stagnant air, as well as the equipment application (heating only, cooling only, or combination). Application is the largest determining factor when it comes to return air locations.
For heating only applications, a low return duct is ideal to bring back the coldest air otherwise stagnant in the room.…Continue
A seldom practiced design procedure, equipment selection, has been part of the International Residential Code for many years, and local MA/RI code at least since 2010. This critical step is the second part of residential system design, following a Manual J load calculation and prior to the Manual D duct design. I think confusion around the dated manual has contributed to lack of use and enforcement. Whether you are installing an air-conditioner, heat pump, furnace, or boiler, there…Continue
Months fly by, and it is closer to Fall in New England. Soon most local Plumbing, Heating, and Cooling companies will be consumed with Fall maintenance programs. I remember spending countless hours a week dealing with humidifiers, whether it was the old Skuttle drum style, the Aprilaire bypass version, or even the steam models that have actually been improved over the years - particularly Honeywell's Truesteam. The one…Continue
Deep Vacuum Chart; Carrier…
Ever since the adoption of the 2009 International Residential Energy Conservation Code (IECC), duct sealing efforts have been tested using the total leakage or leakage to outdoors methods. It really is amazing how much duct gains effect the operation of your equipment and the comfort of your customer. The missing part of "duct testing" appears to be how well the ducts are insulated. Sure, you are required to use R-8 insulation on supply ductwork when located outside the building envelope,…Continue
When completing your site survey for Manual J Load Calculations, significant time can (or should) be spent identifying window values. Did you know that most windows these days come with an NFRC rating, a tag located in the window jam that you can reference on NFRC.org? This identification number can tell you important details like window coatings, u-value, light transmittance, air leakage, and solar heat gain coefficients (SHGC). Not identifying the correct values can sway your load…Continue
How do you know if should upgrade your air-conditioner to a heat-pump and create a dual-source application during replacement this Summer? I personally always prefer the option of multiple fuel sources, particularly since energy prices have been all over the place during the last decade. Fortunately, based on average energy prices, there is some simple math to figure out if an aggressive assessment should be made for a dual-source heat pump application, based on equations from ACCA's…Continue
I have found that this topic often goes unnoticed, or can be a guessing game out there in the field. Diagnosing improper fixed orifice sizes is actually a fairly simple, cut and dry procedure. First, I would argue for efficiency reasons, as well as ease of proper charging, you should just field install a TXV. Of course, when you are on the job site you don't want to spend precious time attempting to adjust refrigerant charge with the incorrect orifice. You would never be able to get…Continue