Instructions / Assembly

MODEL VOLTAGE DESCRIPTION/OPERATION
24 24 VAC Interrupts power immediately in a low water condition. Heavy duty construction.
170 120 VAC Automatically restarts burner on return of normal water level. Provides contacts
for optional low-water alarm.
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W A T E R B O I L E R C O N T R O L S
Low Water Cut-Offs – Residential/Commercial
24 & 170 Series
•
Heavy Duty Design
•
Automatic Reset
500 Series
•
Manual Reset
•
Burner Circuit Test Button
•
LED Indicating Lights
600 Series
•
Automatic Reset
•
Burner Circuit Test Button
•
LED Indicating Lights
700 Series
•
Manual Reset
•
LED Indicating Lights
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
MODEL VOLTAGE DESCRIPTION/OPERATION
500 24 VAC Interrupts power immediately in a low water condition. Burner circuit locks-out
550 120 VAC if water remains below probe for 30 seconds. Manual reset will not trip due to
power failures. Test button simulates low water condition.
MODEL VOLTAGE DESCRIPTION/OPERATION
700 24 VAC Interrupts power immediately in a low water condition. Burner circuit locks-out
750 120 VAC if water remains below probe for 30 seconds. Manual reset will not trip due to
power failures.
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.
Specifications Model 24 Model 170
Power Consumption 8 VA 7 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
Note: Models 500 and 700 can also be used as a secondary cut-off on steam boilers (see page 11)
Hydrolevel Catalog 2018 Page 7