Description
The PRO1 IAQ T855SH Universal Thermostat is a powerful, flexible solution designed for both light commercial and residential HVAC applications. Compatible with up to 2 stages of heat and 3 stages of cool on conventional systems, or up to 5 stages of heat and 3 stages of cool on heat pump systems, the T855SH handles virtually any installation a contractor will encounter. Choose between 7-day, 5-1-1, or non-programmable operation, and power it via hardwire (18–30 VAC, NEC Class II) or 2 AA alkaline batteries for maximum installation flexibility.
Built for serious comfort control, the T855SH features humidity and dehumidity control, ventilation control, IAQ fan settings, and Advanced Pre-Occupancy Purge to keep indoor air fresh and healthy. Auto changeover, customizable staging logic, adjustable heat and cool swing (0.2°F to 2.0°F), and selectable two or four occupancy/unoccupancy time periods make it equally at home in offices, retail spaces, and single-family homes. Pair it with the R250S outdoor sensor to enable dual-fuel balance points and outdoor temperature display, or connect up to 16 R251S indoor remote sensors to average temperatures across multiple zones.
A large 8 sq. in. display with blue backlight and glow-in-the-dark light button makes operation easy in any lighting condition, while partial and full keypad lockout, adjustable setpoint limits, and Summer Away mode protect settings in rentals and commercial properties. Backed by a 5-year warranty, the T855SH delivers professional-grade performance, IAQ control, and installation versatility in one universal package.
Features:
- Universal Application: Up to 2 stages of heat / 3 stages of cool conventional, or up to 5 stages of heat / 3 stages of cool heat pump
- Flexible Programmability: 7-day, 5-1-1, or non-programmable operation
- Dual Power Options: Hardwire (18–30 VAC, NEC Class II, 50/60 Hz) or 2 AA alkaline batteries
- Indoor Air Quality Control: Humidity and dehumidity control, ventilation control, IAQ fan settings
- Advanced Pre-Occupancy Purge: Freshens indoor air before occupied periods
- Dual-Fuel Capable: Set balance points with the R250S outdoor sensor
- Remote Sensor Capable: Supports up to 16 R251S indoor remote sensors for system averaging
- Auto Changeover: Automatic heating/cooling switching (not available in PTAC mode)
- Customizable Staging Logic: Tailor system response for optimal comfort and efficiency
- Large 8 sq. in. Display: Blue backlight with glow-in-the-dark light button
- Occupancy Scheduling: Two or four occupancy/unoccupancy time periods
- Adjustable Heat & Cool Swing: 0.2°F to 2.0°F for precise comfort tuning
- Adjustable Setpoint Limits: Ideal for rentals, offices, and commercial spaces
- Summer Away Mode: Energy savings during extended absences
- Keypad Lockout: Partial or full lockout to prevent unauthorized changes
- Easy Access Battery Compartment: Quick, tool-free battery replacement
- Display Range: 41°F to 95°F (5°C to 35°C)
- Control Range: 44°F to 90°F (7°C to 32°C)
- Display Accuracy: +/- 1°F
- Terminals: Rc, Rh, G, Y, Y2, S1, S2, C, O, B, W/E, W2
- Load Rating: 1 amp per terminal, 1.5 amp maximum combined
- Operating Ambient: 32°F to 105°F (0°C to 41°C)
- Operating Humidity: 90% non-condensing maximum
- Mounting: Wall or junction box
- Dimensions: 4.7″W x 4.4″H x 1.1″D (119mm W x 112mm H x 28mm D)
- Warranty: 5-Year Limited Warranty
Applications:
Single-family homes, multi-family housing, light commercial buildings, offices, retail spaces, churches, and any application requiring multi-stage HVAC control, IAQ management, or remote sensor averaging.
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