The year was 1774, and a man named Tom traveled the Atlantic from England to visit his friend Ben in Philly. Tom was 37 years old, and he had already been through a failed business and lost his wife and child during childbirth. He was a troublemaker by some accounts—a free spirit at the very […]

Back in the “good old days,” controls were all analog and mechanical; that simply means they acted in a directly connected and variable manner based on a change in force. Both pneumatic (air pressure) and hydraulic (fluid pressure) systems are examples of mechanical or analog controls. When the pressure increases or decreases on a particular […]

When I first started in the trade, we used to run into shielded control wires on the Carrier Comfort Zone 1 zoning systems and also on a Carrier VVT system I used to maintain at a bank. I knew it has something to do with electrical “noise” and that communicating systems often called for it, […]