Tekmar tN4 Wiring Center-Six Zone Valve. tekmarNet??4 Wiring Center 315 is designed to provide a zoning solution for heating systems. It can be used in applications ranging from baseboard zones, to remote manifolds for radiant heating. This product provides power for up to six tekmarNet??4 rmostats, and up to six 24 V (ac) zones valve outputs, as well as providing an end switch closure to enable an external device such as a boiler. A zone group pump relay is also available to switch a pump.