LUX Pro P621U programmable thermostat fits universal conventional heat and A/C plus heat pumps up to 2-stage heat/1-stage cool with AUX/EMERG heat, 2 and 3-wire hydronic and gas millivolt heaters. It operates on low-voltage system wiring and dual power from 2 AA batteries, included.
Across the house, select 2 or 4 periods per day in 5/1/1-day mode or non-programmable mode. Set it once, then use temporary override or manual hold for changes.
P621U Highlights
Universal Compatibility
Controls conventional systems and heat pumps with auxiliary heat.
Speed Slide Programming
Slides through setup steps for fast scheduling.
Smart Recovery
Starts early to reach the setpoint on time.
Air Filter Monitor
Shows filter life graphically as runtime adds up.
Keypad Lock
Prevents unauthorized changes to the program.
P621U Specifications
Power: Dual powered, 2x AA alkaline batteries included
Display: Backlit, Fahrenheit or Celsius
Programming: 5/1/1-day with 2 or 4 periods per day, or non-programmable
Not compatible with: 120/240V line voltage systems
Equipment protection: 5/2 minute selectable compressor delay with bypass
System compatibility: Conventional heat/A/C; heat pump 2-heat/1-cool with AUX/EMERG; 2 and 3-wire hydronic; millivolt
