Speedfit Centralised System Timer Speedfit System Timers to be used with a Speedfit Set Back Thermostat. Remote System Timer to be used as a Speedfit Set Back Thermostat or conventional 4 channel programmer. Centralised System Timer - If specified, one timer is needed for each manifold in the system. The timer provides centralised control of the set back functions for the whole manifold via a digital programmer. The timer acts as a timed switch to alternate between 'daytime' and 'Set Back' time. Two timed channels can be programmed to accommodate a number of set-back periods over a 7 day cycle. Remote System Timer - A 4 channel programmer which controls the set-back function of up to 4 wiring centres. It is ideal for larger systems or where the system timer needs to be located away from the manifold