AWC9/AWC5 wiring center is a product to connect thermostats with water heating accessories (boilers, floor heating circulation pumps, connection center for plumbing valves, zone valves or domestic hot water valves, radiator valves, etc). Each zone in the center of the line is equipped with a test switch to facilitate debugging the water heating system for users. It has a built-in timer. When the main water heating valve does not have a position auxiliary line, this timer will be turned on to ensure that circullation pump extends the service life of the water heating pipe .