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Dip Switch Settings. Troubleshooting: • Problem: Digital thermostats do not work cor- rectly when connected to a zone valve control. • Solution: Some A Taco zone valve has three wiring terminals arranged in a vertical column on the head. The top terminal receives 24-volt power from the system transformer —Ease of Installation / Operation: The Zone Sentry is the most technologically advanced zone valve ever made. It's also simple to install and operate.