Lux - P521U - Digital 5-2 Day Programmable/Manual, 2 Heat/1 Cool, Universal Thermostat

Item: LXPP521U
MFG: P521U
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Digital 5-2 Day Programmable/Manual, 2 Heat/1 Cool, Universal Thermostat


Digital 5-2 Day Programmable/Manual, 2 Heat/1 Cool, Universal Thermostat


  • Separate Weekday and Weekend Programs (2 or 4 Periods/Day)
  • Large Display with Back Light
  • Adjust Heating and Cooling Limits
  • Keyboard Lock
  • Programmable Air Filter Monitor
  • Selectable Smart Recovery
  • Dual Power - 2 Aa Batteries Included
  • User Selectable Programmable or Non-Programmable Operation
  • Manual Temperature Hold
  • Temporary Temperature Override
  • Adjustable Temp. Differential Cycle Rate
  • Adjustable 2Nd Heat Stage Offset Setting
  • User Temperature Calibration
  • 5/2 Minute Selectable Time Delay
  • Battery Free Memory Storage
  • 12/24 Hour Clock Display
  • Optional Wall Plate Available

California residents: see Proposition 65 Warning

Features and Specification

Language English
Length 1.5000
Low Battery Indicator Yes
Manual Yes
Mounting Horizontal
Number of HVAC Zones 1
Operating Temperature Range 14°F to 122°F (-10°C to 50°C)
Displays Outdoor Temperature No
Dual Transformer Compatible No
EAN 0021079125210
Electrical Connection 24 VAC
Electrical Rating 1.5 Amps per terminal at 24 Volts AC
Energy Star Rated No
Fan Switching No
Inside Width 5 1/4"
Heat Pump Compatible Yes
Height 5.5000
Hinged Yes
Humidification No
Includes Installation Kit and Manual
Indoor Remote Sensor No
Inside Depth 1"
Inside Height 3 1/4"
Phase Single
Width 4.7500
Touchscreen No
Stages Heat 2
Switch Action No
System Switching No
Temperature Range 45°F to 90°F (7.2°C to 32.2°C)
Temperature Settings per Day 4
Terminal Designations O, B, G, Y, RC, RH, W1, A, W2, C
UPC 021079125210
Vacation Mode No
Voltage 24 VAC
Warranty Offered Yes
Stages Cool 1
Package Height 6.2500
Package Length 9.2500
Package Weight 5.4000
Package Width 9.2500
Power Method Dual Powered: Battery or Hardwired
Programmable Yes
Programmable Fan No
Sensing Element No
Dimensional Weight 3.0000
Display Options LCD
Weight 0.5000
Display Yes
Batteries Included Yes
Battery Backup Yes
Brand Lux®
Built In Wi-Fi No
Change/Check Reminders Yes
Composition Acrylonitrile-Butadiene-Styrene
Cubic Measurement 0.0227
Cycle/Hertz 60
Daylight Savings Time Ready No
Differential Temperature + or - 1 degree
Digital-Non Programmable Yes
Digital-Programmable Yes
Backlit Yes
Auto Changeover No
750mV Compatible Yes
Accuracy + or - 1 degree
Ambient Temperature Range 45°F to 90°F (7.2°C to 32.2°C)
Application 2 Heat 1 Cool


picture_as_pdf data sheet

picture_as_pdf installation instructions

picture_as_pdf specification sheet