Immersion type controller provides high limit protection and low limit/circulator control in hydronic heating systems which include domestic hot water service. Installed in conjunction with a 24 volt thermostat. Mounts directly to immersion well; sensing bulb is 3/8 x 3". L8124A - Provides multi-zone control by using a separate circulator and R845 relay for each zone. Vertical mounting. L8124B - Provides single zone control. Vertical or horizontal mounting. L8124C - Provides multi-zone control by using a separate circulator and R845 relay for each zone. Horizontal mounting. L8124E - Provides multi-zone control by using a separate circulator and R845 relay for each zone. Includes 30 VA transformer and extra terminals to supply power to 24v zone valves. Vertical or horizontal mounting. L8124G - Provides multi-zone control by using a separate circulator and R845 relay for each zone. Includes 30 VA transformer and extra terminals to supply power to 24v zone valves. Vertical or horizontal mounting. L8124L- Includes ZC-ZR terminals for multi-zone control using a separate circulator and R845A relay for each zone. With large trans former and extra terminals for supplying power to low voltage zone valves.
LOW LIMIT/CIRCULATOR DIFFERENTIAL:
