Resideo Braukmann tr21 20K Ohm Ntc Non-linear Temperature Wall Module

Product Description

The Resideo Braukmann TR21 is a direct-wired wall module designed for space temperature sensing in commercial and light industrial HVAC systems. It uses a 20K ohm NTC non-linear thermistor sensor to deliver accurate temperature readings to compatible building automation controllers. This module is part of a broader family that includes the TR22, TR23, and TR24, all sharing the same core wiring and controller compatibility. The TR21 mounts cleanly on a standard 2 by 4 inch junction box or on a 60 mm diameter junction box, making installation straightforward for HVAC technicians working in standard commercial construction environments. The unit is white and blends into typical office and commercial wall finishes without drawing attention. Compatible controllers include the Honeywell Excel 600, 500, 100, and 80 series, the Excel 10 W7750, W7751A, W7752, and W7753 controllers, the W7761 Controller, and Spyder Unitary Controllers. It is also compatible with T7350 and TB8220 thermostats, giving this module broad utility across multiple installed base platforms. The operating temperature range runs from 45 degrees Fahrenheit to 99 degrees Fahrenheit, covering the full comfort range for occupied commercial spaces. Humidity tolerance extends from 5 to 95 percent relative humidity, non-condensing, which suits most interior environments. The module measures 4 and 13 sixteenths inches high, 3 inches wide, and 7 eighths of an inch deep, keeping a low-profile footprint on the wall. HVAC controls technicians, building automation specialists, and service contractors will recognize this as a reliable networked sensor input device for zone-level temperature monitoring. The TR21 is the module only and does not include a separate sensor. It is intended for use in networked controller environments where the building management system reads the NTC thermistor signal to regulate heating, cooling, and ventilation outputs at the zone level.

• 20K ohm NTC non-linear thermistor provides accurate space temperature sensing for building automation systems
• Compatible with Honeywell Excel 600, 500, 100, 80, Excel 10 series, Spyder Unitary Controllers, T7350, and TB8220 thermostats
• Mounts on a standard 2 by 4 inch junction box or 60 mm diameter junction box for easy field installation

Product Highlights

The Resideo Braukmann TR21 delivers reliable zone-level temperature input for a wide range of Honeywell and Resideo building automation controllers. Its compact white housing and standard junction box mounting make it a practical choice for commercial HVAC controls installations.

Product Information

Standard Information

• Brand: RESIDEO BRAUKMANN
• Manufacturer Part Number: TR21

Technical Specifications

• Sensor Type: 20K ohm NTC non-linear
• Application: Networked Sensor
• Color: White
• Mounting: Standard 2 by 4 inch junction box or 60 mm diameter junction box
• Operating Temperature Range: 45 F to 99 F
• Operating Humidity Range: 5 to 95 percent RH, non-condensing
• Dimensions: 4 and 13/16 inches high by 3 inches wide by 7/8 inch deep
• Compatible Controllers: Spyder, Excel 600, 500, 100, 80, Excel 10 and 15 Series Controllers
• Also Compatible With: T7350 and TB8220 Thermostats