123966 AERCO Boiler and Water Heater OVER TEMP SWITCH W/ AUTO RESET

123966 AERCO Boiler and Water Heater OVER TEMP SWITCH W/ AUTO RESET

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AERCO 123966 is the OEM Over‑Temperature Switch with Auto Reset, a safety device designed to prevent overheating in AERCO boilers and water heaters. Grounded distributor data confirms its specifications, operating ranges, materials, and purpose.

🔧 Core Identity & Function

Part Number: 123966 Component: Over‑Temperature Switch (Auto Reset) OEM: AERCO

This switch monitors system temperature and automatically opens the safety circuit if water temperature exceeds its rated limit. Once temperature drops back into the safe range, the switch resets itself without manual intervention, restoring normal operation.

Its role is to prevent:

• Heat‑exchanger damage

• Over‑temperature lockouts

• Safety hazards caused by runaway heating

PartsHnC confirms it is used to protect against heat‑related harm and is built for reliability in harsh boiler environments.

📐 Technical Specifications (Grounded)

• Temperature Range: 0°F to 180°F

• Pressure Rating: Up to 150 PSI

• Material: High‑grade stainless steel (corrosion‑resistant)

• Connections: 1" or 2" NPT

• Weight: 0.47 lb

• Reset Type: Automatic (no manual reset required)

Applications

Used in:

• AERCO commercial boilers

• AERCO commercial water heaters

Typical service scenarios:

• Over‑temperature faults

• Safety‑circuit failures

• Replacement of worn or drifting limit switches

• Preventive maintenance on high‑duty hydronic systems

AERCO 123966 Over‑Temperature Switch w/ Auto Reset — Genuine OEM safety switch for AERCO boilers and water heaters. Rated for 0°F–180°F and up to 150 PSI, this stainless‑steel switch protects the system from overheating and automatically resets once temperatures return to safe levels. Ensures reliable, code‑compliant operation in demanding hydronic environments.