Product Overview

500 Series
•
Manual Reset
•
Burner Circuit Test Button
•
LED Indicating Lights
•
Meets ASME CSD-1 Requirements for
Commercial Water Boilers
600 Series
•
Automatic Reset
•
Burner Circuit Test Button
•
LED Indicating Lights
700 Series
•
Manual Reset
•
LED Indicating Lights
W A T E R B O I L E R C O N T R O L S
Low Water Cut-Offs – Commercial
Specifications Model 500 Model 550
Power Consumption 2 VA 4 VA
Switching Capacity 50 VA 5.8 FLA, 34.8 LRA
Switch Contacts SPDT SPDT
Max. Pressure 160 PSI 160 PSI
Specifications Model 600 Model 650
Power Consumption 2 VA 4 VA
Switching Capacity 50 VA 5.8 FLA, 34.8 LRA
Switch Contacts SPDT SPDT
Max. Pressure 160 PSI 160 PSI
Specifications Model 700 Model 750
Power Consumption 2 VA 4 VA
Switching Capacity 50 VA 5.8 FLA, 34.8 LRA
Switch Contacts SPDT SPDT
Max. Pressure 160 PSI 160 PSI
MODEL VOLTAGE DESCRIPTION/OPERATION
500 24 VAC Interrupts power immediately in a low water condition. Burner circuit locks-out if
550 120 VAC water remains below probe for 30 seconds. Manual reset will not trip due to
power failures. Test button checks burner circuit to ensure proper control opera-
tion and lock-out function without lowering the water level.
Note: Can also be
used as a secondary cut-off on steam boilers (see page 12)
MODEL VOLTAGE DESCRIPTION/OPERATION
600 24 VAC Interrupts power immediately in a low water condition. Automatically restarts
650 120 VAC burner on return of water level. Test button checks burner circuit to ensure
proper control operation without lowering the water level.
8
MODEL VOLTAGE DESCRIPTION/OPERATION
700 24 VAC Interrupts power immediately in a low water condition. Burner circuit locks-out if
750 120 VAC water remains below probe for 30 seconds. Manual reset will not trip due to
power failures. Note: Can also be used as a secondary cut-off on steam boilers
(see page 12)