The IEC 90001780 is a line-voltage fan coil thermostat assembly (P/N E055-70010525) engineered for automatic heat-cool changeover in 4-pipe hydronic systems. Built around the Honeywell T4039M-1103 thermostat base and featuring a factory pre-wired 6-pin Molex quick-connect plug, this assembly enables fast plug-and-play installation and reliable room temperature control across commercial and institutional HVAC systems.
Technical Details
- Model / Assembly: 90001780 (Assembly P/N: E055-70010525)
- Thermostat Component: Honeywell T4039M-1103
- Manufacturer: IEC
- Type: Line-Voltage Automatic Changeover Fan Coil Thermostat Assembly
- Operating Voltage: 120 VAC to 277 VAC, 50/60 Hz
- System Application: 4-Pipe Fan Coil Units (Automatic Heating/Cooling)
- System Switching: ON – OFF
- Fan Switching: 3-Speed Fan Control (HI – MED – LO)
- Connection Style: Integrated pre-wired 6-pin Molex quick-disconnect plug
- Temperature Setting Range: 55°F to 95°F (13°C to 35°C), marked COOL-WARM
- Mounting Style: Standard 4″ x 4″ junction box or 2-gang electrical outlet box
Key Features
- Factory pre-wired 6-pin Molex quick-connect wiring harness accelerates field service and prevents wiring errors.
- Automatic heating/cooling changeover mechanism seamlessly adjusts valve position based on room thermal demand.
- 3-speed manual fan control (High, Medium, Low) provides customized airflow distribution and acoustic comfort.
- Versatile line-voltage capability operates reliably across 120V, 208V, 240V, and 277V AC electrical supplies.
- Direct OEM replacement assembly designed specifically for IEC fan coil units.
Applications
- 4-pipe hydronic fan coil unit (FCU) temperature control in hotels, motels, and resorts.
- University dormitories, student housing complexes, and campus facilities management networks.
- Military barracks, government administrative suites, and municipal public buildings.
- Commercial office buildings, multi-family residential towers, and healthcare suites.
We ship this product worldwide! Delivery is normally stock.
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