- Manual Reset
- Burner Circuit Test Button
- LED Indicating Lights
- Meets ASME CSD-1 Requirements for
- Commercial Water Boilers
- Can be used as a secondary low water cut-off for steam boilers
| 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 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. |
| 550 | 120 VAC | |
