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18557-2 AERCO Boiler and Water Heater -20/240F REV ACT REMOTE BULB

18557-2 AERCO Boiler and Water Heater -20/240F REV ACT REMOTE BULB

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18557-2 AERCO Boiler and Water Heater -20/240F REV ACT REMOTE BULB

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AERCO 18557‑2 is the OEM –20°F to 240°F Reverse‑Acting Remote Bulb Temperature Control, and the grounded search results give us a complete, authoritative profile of the part.

AERCO 18557‑2 Remote Bulb Temperature Control (–20°F to 240°F, Reverse‑Acting) — OEM hydronic temperature controller for AERCO boilers and water heaters. Features a remote bulb sensor for accurate temperature monitoring and reverse‑acting operation for high‑limit and safety applications. Engineered for precise, reliable performance in commercial HVAC and hydronic systems.

🔧 Core Identity & Function

Part Number: 18557‑2 Component: Reverse‑Acting Remote Bulb Temperature Control OEM: AERCO Temperature Range: –20°F to 240°F Action: Reverse‑acting (output decreases as sensed temperature rises)

This control uses a remote bulb sensor to monitor temperature at a distance from the control body (pipe, tank, duct, or heat‑exchanger surface). The reverse‑acting design is used when rising temperature must reduce output, such as:

  • High‑limit safety functions

  • Cooling‑valve actuation

  • Hydronic system protection

  • Combustion‑air or water‑temperature regulation

Technical Specifications

  • Temperature Range: –20°F to 240°F

  • Action Type: Reverse‑acting

  • Sensor Type: Remote bulb

  • Application: Boiler control, commercial HVAC, hydronic heating

  • Operation: Output decreases as sensed temperature rises

  • Mounting: Bulb installs in process; control mounts remotely

Applications

Used in:

  • AERCO commercial boilers

  • AERCO commercial water heaters

  • Hydronic heating systems requiring remote temperature sensing

  • High‑limit or reverse‑acting control loops

Typical replacement scenarios:

  • Faulty or drifting temperature control

  • High‑limit safety failures

  • Remote bulb leakage or sensor failure

  • Preventive maintenance on aging control assemblies