Honeywell TR21-A/U NTC Non-Linear Temperature Wall Module. The TR21, TR22, are a family of direct wired wall modules for use with Honeywell Excel 600, 500, 100, and 80 controllers; Excel 10 W7750, W7751A, W7752, and W7753 controllers; W7761 Controller; and Spyder Unitary Controllers.
Manufacturer: | Honeywell |
Color: | White |
Mpn # | TR21-A |
Weight | 4.40 lbs. |