Manufacturer Emerson
Brand Sensi
Manufacturer Product No. ST55
UPC 683318654648
Program Options Programmable - 7 Day or Non-Programmable
Program Periods Per Day Options 8 Max
Battery Power Rating 0 to 30 Vac, 50/60 Hz or DC
Terminals RC, RH, C, W/E, W2, Y, Y2, O/B/2, G, L
3-Wire Zone Valve Connections Yes
Millivolt Compatible No
Economizer Connections No
Humidity Control Displays indoor humidity
Heat Pump Dual Fuel Control Yes (Remote Sensor Not Required)
Heat Pump Auxiliary Lockout Control - Outdoor Sensor Option None
Remote Sensor Options None
Auto Changeover (Heat/Cool) Yes
Fan Option Auto, On
Filter Change Reminder Yes
Early Start Yes
Keypad Lockout Total Lockout
Set-Point Temperature Limits No
Backlight Yes; Continuous Backlight with Common Wire
Voltage 20-30 Vac, NEC Class II, 50/60Hz
Amp Rating 0.05 to 1.5 Amps (load per terminal) 1.5 Amps maximum load (all terminals combined)
Rated Differential, Universal Heat (Conventional Gas, Oil, Electric): 0.5°F (Fast) 0.75°F (Med) 1.9°F (Slow); Cool (Central Air): 0.9°F (Fast) 1.2°F (Med) 1.7°F (Slow); Heat Pump: 0.9°F (Fast) 1.2°F (Med) 1.7°F (Slow); Aux. Heat: 0.5°F (Fast) .75°F (Med) 1.9°F (Slow)
Ambient Operating Temperature 32° to 105°F (0 to 40°C)
Operating Humidity 90% non-condensing maximum
Shipping Temperature Range -20 to 150°F (-29 to 66°C)