Description
Honeywell T775P2003 Electronic Temperature Controller
Boiler Special – 3 Temp Inputs, 4 SPDT Relays, 1 Pump Output, 3 Sensors, NEMA 1
The T775P2003 is a specialized temperature controller designed for boiler control applications, providing advanced reset functions, loop staging, and precise remote temperature sensing. With three sensor inputs and four relays, this model supports staged boiler control while managing pump operation via a dedicated digital output. Its intuitive programming and large graphical interface make setup fast and user-friendly.
Key Features
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Designed specifically for boiler staging and reset loop control
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3 temperature sensor inputs for multi-point system monitoring
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4 SPDT relay outputs for boiler or stage control
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1 dedicated digital output for pump control
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Integrated outdoor reset and setpoint scheduling options
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Configurable PI or PID loop control for modulating accuracy
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Graphical user interface with large display and intuitive navigation
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Built-in minimum off-time protection for connected equipment
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Remote temperature sensing up to 1,000 ft
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Comes with (3) 50021579-001 sensors
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NEMA 1 enclosure for indoor installations
Technical Specifications
| Parameter | Details |
|---|---|
| Application | Boiler Temperature & Staging Control |
| Type | Special Boiler w/ Reset – NEMA 1 |
| Relay Outputs | 4 SPDT |
| Digital Output | 1 (Pump Output) |
| Sensor Inputs | 3 |
| Included Sensors | (3) 50021579-001 |
| Sensor Type | 1097 ohm PTC @ 77°F |
| Voltage Compatibility | 24V / 120V / 240V |
| Frequency | 50 / 60 Hz |
| Contact Ratings (24V) | 10.0A Resistive |
| Contact Ratings (120V) | 1/2 hp; 9.8 AFL, 58.8 ALR, 125 VA Pilot |
| Contact Ratings (240V) | 1/2 hp; 4.9 AFL, 29.4 ALR, 125 VA Pilot |
| Setpoint Temperature Range | -40°F to 248°F |
| Accuracy | ±1°F at 77°F |
| Throttling Range | 1°F to 150°F |
| Max Sensor Distance | Up to 1,000 ft |
| Ambient Temp (50 Hz) | -40°F to 125°F |
| Ambient Temp (60 Hz) | -40°F to 140°F |
| Dimensions (H × W × D) | 8 5/32" × 4 13/32" × 2 15/16" |
| Bulb Size | 1/4" × 2" |
| Enclosure | NEMA 1 |
| Output Reset | Yes |
| Loop Control | Multi-stage with Reset Logic |
Ideal Applications
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Boiler sequencing and staging
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Hydronic systems requiring temperature reset logic
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Multi-sensor HVAC zone monitoring
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Industrial heating with staged outputs
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Systems needing integrated pump control
