The thermostats operate according to the liquid expansion principle. The set point adjuster is directly fitted to the actuator.
There are two sensor designs with different time constants:- AFT 06 smooth sensor ~120 sec- AFT 17 spiral sensor ~20 sec
Temperature control of domestic hot water systems with storage tanks and restriction of the return flow temperature in district heating transfer station are the main fields of application. Combinations: temperature controller, safety temperature monitor type STFW.
Type-tested according to EN 14597 in connection with the following valves:VFG 2, VFG 21, VFGS 2, VFG 33 and VFU 2.