• Brand: Honeywell (Minneapolis, MN)
  • Model / MPN: T4054A 1000 (T4054A)
  • Revision / Style Reference: REV. A / 138530
  • Equipment Type: Heavy-Duty Industrial Line Voltage Thermostat / Utility Temp Controller
  • Electrical Configuration: Single Pole Single Throw (SPST) - R-B Opens on Temperature Increase
  • Voltage Supply Compatibility: 120V AC / 240V AC Line Voltage Direct Control
  • Full Load Amperage (FLA): 16.0 Amps @ 120VAC / 8.0 Amps @ 240VAC
  • Locked Rotor Amperage (LRA): 96.0 Amps @ 120VAC / 48.0 Amps @ 240VAC
  • Sensing Element Style: High-sensitivity external copper coiled capillary bulb sensor loop
  • Wiring Connection Requirement: Use Copper Conductors Only
  • Safety Certifications: UL Listed 174H (Temperature Indicating and Regulating Equipment)
Item Description
This item is a factory-original Honeywell T4054A 1000 line voltage industrial utility thermostat controller. Purpose-built for severe duty service in demanding commercial HVAC, agricultural ventilation, and heavy industrial cooling systems, this heavy-duty controller switches line voltage power directly to inductive motor loads without needing a step-down transformer or auxiliary control relay panel.
The mechanical controller features a rugged, impact-resistant grey steel housing enclosure matched with a front-facing manual adjustment dial. It relies on a high-sensitivity, heavy-gauge coiled copper capillary bulb sensor located on the bottom of the chassis frame to detect immediate changes in ambient air or pipeline temperatures. The SPST electrical switch is internally wired to open the R-B circuit on a temperature increase, making it an elite direct controller for exhaust fans, ventilation shutters, chiller pumps, or cooling loops.
Practical Industrial HVAC & Commercial Applications
  • Industrial Exhaust & Ventilation: Direct power switcher for high-volume greenhouse, livestock, warehouse, or factory exhaust fans that need to cycle on when ambient room temperature rises.
  • Cooling Tower & Fluid Loop Controls: Monitors temperature thresholds to directly switch low-horsepower water circulation pumps or fan assemblies tied to evaporative condensers and cooling towers.
  • Walk-In Cooler Ventilation: Controls auxiliary fresh-air intake fans or safety dampers in industrial commercial refrigeration compressor rooms and food processing warehouses.
Cross-System Component Compatibility
This line-voltage Honeywell thermostat integrates cleanly into primary plant configurations alongside heavy-duty equipment:
  • Primary Pumps & Machinery: Cycles auxiliary fluid circulation loops running inline near heavy motor equipment powered by WEG, Baldor, or Scot Pump skids.
  • Flow Management Infrastructure: Operates in tandem with centralized plant loops utilizing Danfoss PM main servo valves, Hansen regulators, and Parker line solenoids to handle temperature safety thresholds.