Hydrolevel low water cut-offs are electrically operated. A probe is installed in the boiler shell or external manifold and is connected to the control unit. Water is used as a conductor to complete the circuit between the probe and the boiler shell. When water is in contact with the probe, the circuit is completed; when the water level drops below the probe, the circuit opens. Hydrolevel controls provide contacts to de-energize the burner circuit in a low water condition.
700 Series Interrupts power immediately in a low water condition. Burner circuit locks-out if 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
Features
- Heavy-duty electro-mechanical design for long life
- Automatically shuts off burner in a low water condition to
prevent boiler damage
- Low maintenance. No moving parts to wear stick or hang up,
as in float devices.
- Manual reset feature will not lock out in power
failures
Specifications
- Power Consumption: 2 VA
- Switching Capacity: 50 VA
- Switch Contacts: SPDT
- Max. Pressure:160 PSI