National Technical Letter of Intent Signing Day is a successful event that has been held each of the last four years, helping thousands of students achieve their moments of glory at more than 40 schools as they prepare for rewarding careers in the skilled trades.
The condensing unit market is on the rise. According to a report published by MarketsandMarkets, the global condensing unit market is forecast to reach $23.31 billion by 2021, growing at a compound annual growth rate (CAGR) of 11.1 percent from 2016 to 2021. And there are a number of trends contributing to this growth.
Unprecedented. Unconventional. Chaotic. Exhausting. Whatever adjective you use to describe them, the first 100 days of the Trump presidency were a crazy time for our nation. People across the country — and around the world — have watched and tried to understand the policy directions of this White House. What have the first 100 days meant for the HVACR industry and what do they portend for the future?
The QCC2 and QCC3 air-cooled scroll-compressor condensing units are part of Johnson Controls’ portfolio of ready-to-ship products. They are designed for applications ranging from 15-160 ton and may be paired with indoor air handlers using direct expansion (DX) evaporator coils.
Members of The NEWS’ trainer panel examined compressor valves and determined the best methods for maintaining valves, diagnosing faulty ones, and implementing proper troubleshooting techniques when they go bad.
These units feature a 70°F floating head pressure control valve and an integral subcooling circuit that allows saturated liquid to flow from the receiver to the condenser where the refrigerant is sub-cooled by ambient air.
One method of head-pressure control during low ambient conditions is to use a mechanical hold-back or flooding valve located at the outlet of the condenser to hold back or flood liquid refrigerant in the condenser. This valve is often referred to as an open on rise of inlet (ORI) valve because it will start to throttle open on a rise in condenser pressure.