Description

Hydrolevel Safgard 550SV is a 120V commercial-grade low water cut-off (LWCO) for Gas or Oil-fired hot water boilers (or as a secondary on steam boilers) with manual reset, test button and short probe (designed to fit into a standard tee fitting). Immediately interrupts power in a low water condition, locks out burner circuit if water remains below probe level for longer than 30 seconds. Manual reset will not trip due to power failures. Test button simulates low water condition and allows for checking control without lowering the water level in a system.

Cross-References:

McDonnell & Miller: PS-851-M-SP-120
Taco: LTM120

Features:

Short probe fits inside standard tee fitting
Meets ASME CSD-1 requirements for commercial applications
Suitable for Gas or Oil-fired boilers
Separate Test button for easy diagnostics without lowering the water level or removing the probe
Separate Manual Reset button with nuisance lock-out protection (will not trip due to power failures)
LED indicators for power and low water
Suitable for use as a secondary control on residential and light commercial steam boilers
Low maintenance – no blowdown or moving parts
Multiple wiring options
Contacts for optional low water alarm

Technical Specifications:

System Type: Gas or Oil-fired Hot Water or Steam (as Secondary) Boilers
Reset: Manual
Connection: 3/4″ NPT
Electrical Specs: 120V, 60 Hz, 4 VA (Power Consumption); SPDT (Relay Type), NEMA 1 Enclosure
Switching Capacity: 5.8 FLA, 34.8 LRA
Max Pressure: 160 psi