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.
Here is a brief overview of the habits, detailed discussions of each habit will follow over the coming months: Habit 1: “Being Proactive.” Habit 2: “Begin With the End in Mind.” Habit 3: “Putting First Things First.” Habit 4: “Think Win/Win.” Habit 5: “Seek First to Understand then be Understood.” Habit 6: “Synergize.” Habit 7: “Sharpening the Saw.” SEE SOURCE
This week’s gallery spotlights heat pumps: a high-efficiency, low-decible heat pump and air conditioner line; a low-profile heat pump for small spaces; an energy-efficient hydronic heat pump; a mini-VRV for residential and light commercial applications; a residential mini-split system; and a water-to-air geothermal heat pump.
Hot, superheated vapor enters at point A. From point A to B, the superheat is removed. The vapor is saturated at point B. Condensing then starts, and saturated vapor is converted into a liquid. At point C, the refrigerant is 100% saturated liquid. The third step, from point C to D, is to subcool the liquid refrigerant by reducing the temperature. In a well-designed system, this process is carried out with a minimal drop in pressure, (rarely more than 10 psi). EXCERPT FROM THE RAC SERIES FROM THE ONLINE STORE AT RSES .
HVAC contractors and testing professionals are reporting that customers want more of a diagnostic and problem-solving approach. Code compliance and plan-and-spec testing are also changing. Some are taking advantage of this trend, while others are resisting. Here’s the 411 on this issue. READ MORE
Developing an online presence, and interacting with your customers in the digital realm is where the industry is today.
What’s 2018 looking like in your neighborhood? Industry trends are guesses based upon data that is parsed by folks whose job it is to predict what things will make an impact and what won’t. If you read trade publications like this one, you’ll see much advertising of new and better(?) products, tools, ideas, etc. You’ll also see informative articles about shops and companies who are on the cutting edge of the business today. However, in order to get a comprehensive picture of what’s hot and what’s not, and where it’s all going, you don’t have to go very far from your own home or office. READ MORE
The FAST-STAT Model 3000 is a 2-part wiring extender kit that adds wiring to an existing cable. Often used when adding air conditioning as it provides R, G, Y & W over an existing 2-wire cable. For cables with more than 2-wires, the other wires can be used for any purpose. No batteries or programming required and has a lifetime warranty. READ MORE
Independent HVAC, electrical and plumbing contractors have long struggled with setting prices that pay the bills and generate significant profit. Rodney Koop can help.
You’ve never haggled over the price of a McDonald’s hamburger. You may have opinions about the relative quality of fast-food, but you always pay the listed price. Same for restaurant food, or car washes.
For so many services, you always pay up, because: That’s. What. It. Costs.
That’s how it should be for your HVAC, plumbing or electrical service business. If you’re not using a menu-based pricing method that establishes a set price for every service item, you’re losing money, and will always struggle to pay the bills. READ MORE