For the best Gemaire experience, please update your web browser.

Lux P621U - 5-1-1 Day Programmable/Manual, 2 Heat/1 Cool, Universal Thermostat

Item: P621U
MFR: P621U

This product is no longer available for purchase.

Comparable Products


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

For Use on:
Heating and cooling systems, including single and multi-stage heat pumps
2 stage heating and 1 stage cooling

Not For Use On:
Electric baseboard heat (120-240V)

2 AA Alkaline (included)

  • Universal compatibility for all system types except electric baseboard heat
  • A program for weekdays, Saturday & Sunday can be different
  • User selectable programmable or non-programmable operation
  • Exclusive Lux® Speed Slide™ for easy programming
  • User selectable periods per day (2 or 4)
  • Graphical filter monitor
  • Keyboard lockout for unauthorized users
  • Adjustable heat/cool temperature limits
  • Adjustable vacation hold (for 1-30 days)
  • Smart recovery - enables the set temperature to be reached by the programmed time
  • Temporary temperature override
  • Large lighted one touch display


NameLux P621U - 5-1-1 Day Programmable/Manual, 2 Heat/1 Cool, Universal Thermostat
Gemaire Item NumberP621U
Manufacturer Product NumberP621U
SKU - PIM Number1366804189462
ERP Number337988
Unit of MeasureEA
Weight0.5 Pounds (Lb)
Length1.5 Inches (In)
Width4.8 Inches (In)
Height5.5 Inches (In)
Country of OriginCHN
Voltage24 VAC
Electrical Connection1.5 AMPS at 24 VAC
Electrical Rating1.5 Amps per terminal at 24Volts AC
Power MethodDual Powered: Battery or Hardwired
Batteries IncludedYes
750mV CompatibleYes
Auto ChangeoverNo
Built In Wi-FiNo
Change/Check RemindersYes
Daylight Savings Time ReadyNo
Digital-Non ProgrammableYes
Display OptionsLCD
Displays Outdoor TemperatureNo
Heat Pump CompatibleYes
Indoor Remote SensorNo
Low Battery IndicatorYes
Programmable FanNo
Stages Cool1
Stages Heat2
Temperature Settings per Day4
Vacation ModeYes
Battery BackupYes
Accuracy+ or - 1 degree
Sensing ElementNo
Ambient Temperature Range45°F to 90°F (7.2°C to 32.2°C)
Application2 Heat 1 Cool
Differential Temperature+ or - 1 degree
Dual Transformer CompatibleNo
Fan SwitchingNo
MountingWall Mounted
Number of HVAC Zones1
Operating Temperature Range14°F to 122°F (-10°C to 50°C)
Removable InterfaceNo
Switch ActionNo
System SwitchingNo
Temperature Range45°F to 90°F (7.2°C to 32.2°C)
Terminal DesignationsO, B, G, Y, RC, RH, W1, A, W2, C
Warranty OfferedYes
Energy Star RatedNo
Inside Width5 1/4"
Inside Depth1"
IncludesInstallation Kit and Manual
Inside Height3 1/4"
Cycle/Hertz60 Hz
GEM - Case Quantity


Parts List

Parts list is loading, wait for a moment....