120volt Manual Reset with 30 Second Delay Hot water Boiler Low Water Cut Off.
- Manual Reset with 30 Second Delay and Power Outage Protection
- Burner Circuit Test Button (500 Series only)
- LED Indicating Lights
- Meets ASME CSD-1 Requirements for Secondary
Cut-Offs on Commercial Steam Boilers
Interrupts power immediately in a low water con-550 120 VAC dition. Burner circuit locks-out if 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 operation and lock-out function without lowering the water level. Note: Can also be used as a secondary cut-off on steam boilers |