5
off the control unit is working regularly, check then the
servo control and the mixing valve.
Check for regular operation of couplers between ser-
vomotor and mixing valve control stem, and for ab-
sence of sliding caused by loosening of setscrews.
EXAMPLES OF ELECTRIC CONNECTIONS FOR
MIXING VALVE WITH SERVO CONTROL AND FOR
BURNERS
1 - Wiring diagram for motor-operated mixing
valves with servo controls powered with 230 V
50 Hz
Circulation pump supply
Servo control
Supply voltage
Common
Open
Close
Delivery probe
EC12 - EC13
Outside
probe
EC11
230 V - 50 Hz
Circulation pump supply
Circulation pump supply
Servo control
supply
Supply voltage
Supply voltage
Burner supply
Delivery probe
EC12 - EC13
Delivery probe
EC12 - EC13
Outside
probe
EC11
Outside
probe
EC11
230 V - 50 Hz
230 V - 50 Hz
Base with terminal board
2 - Wiring diagram for motor-operated mixing
valves with servo controls powered with voltages
other than 230V 50 Hz
3 - Schema elettrico per il comando ON-OFF del
bruciatore
