Heat exchange controller with photoelectric switch for space heating

摘要

The hot fluid flows (2) through a valve (3) having a thermostatic attachment (4) with a working element (5) covered by a casing (8). An electric heater (7) associated with the valve plunger (6) supplies additional heat when its power supply (9) is switched-on (11) by a photocell (12) and until a bimetallic switch (23) is opened at a predetermined temp.The photocell disconnects the mains power unit (19) from the heater (7) when the brightness of the room exceeds a satisfactory level for the number of occupants.