PRO1 Iaq prot855i Wifi Programmable Thermostat 5H 3C

Product Description

The PRO1 IAQ prot855i is a WiFi-enabled, programmable universal thermostat designed for complex residential and light-commercial HVAC systems. It supports up to 5 stages of heating and 3 stages of cooling, making it a capable control solution for multi-stage heat pump and conventional forced-air systems. The prot855i also provides integrated humidification and dehumidification control outputs, allowing a single thermostat to manage full indoor air quality alongside temperature. A large 8 square inch display gives technicians and end users a clear interface for configuration and daily operation. Licensed HVAC technicians typically specify and install this unit during system commissioning or thermostat upgrade projects.

This thermostat is suited for residential and light-commercial applications where multi-stage heating and cooling control is required alongside humidity management. Its universal compatibility makes it a strong candidate for retrofit installations in forced-air gas, oil, or heat pump systems. When full remote-access functionality is needed, the prot855i is compatible with the PRO1 IAQ R251S or R250S remote sensors, which are sold separately. WiFi connectivity enables remote monitoring and scheduling through a connected device.

Key Features

• WiFi-enabled for remote access and scheduling via connected device
• Supports up to 5 stages of heating and 3 stages of cooling
• Integrated humidification and dehumidification control outputs
• Large 8 square inch backlit display for easy on-site configuration
• Universal programmable design compatible with a wide range of forced-air systems
• Compatible with R251S or R250S remote sensors (sold separately)

Compatibility

The prot855i is a universal programmable thermostat compatible with multi-stage heating and cooling systems. Remote sensor functionality requires the PRO1 IAQ R251S or R250S (sold separately).

Installation Notes

Installation should be performed by a licensed HVAC technician. Power down the HVAC system at the breaker and disconnect low-voltage wiring before removing the existing thermostat. Verify system wiring configuration and stage count before connecting terminals to ensure correct staging operation. Follow all applicable local codes and manufacturer wiring instructions when configuring humidification and dehumidification outputs.

Technical Specifications

• Heating Stages: 5
• Cooling Stages: 3
• Humidity Control: Humidify and Dehumidify
• Display Size: 8 square inches
• Connectivity: WiFi
• UPC: 095247201662

Standard Information

• Brand: PRO1 IAQ
• Manufacturer Part Number: prot855i