Tekmar tN2 Wiring Center-Four Zone Valves. tekmarNet??2 Wiring Center 313 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 four tekmarNet??2 rmostats, and up to four 24 V (ac) zones valve outputs, as well as providing an end switch closure to enable an external device such as a boiler. A line voltage output on back of control can operate a zone group pump if required. An outdoor sensor input is included and provides outdoor air temperature reading on each rmostat when an optional outdoor sensor is installed.