Service technicians will run into many different types of zone valves just in one heating season. I will share a troubleshooting encounter I had with a specific style of 3-wire zone valves known ...

Please note that this is not an official fire report on the incident. It is for information purposes and provides the observations of City fire safety officers who worked on the scene. Limitations on ...

This multi-wire cable continuity tester is indispensable for electrical ... 1. Fig. 2 shows the circuit diagram of the multiwire continuity tester. The circuit is built around the CD4047 (IC1), the ...