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White rectangular wall thermostat with backlit display and mechanical knob, twelve units shown

LUX PSP511LC HVAC Control 12-Pack 1-Heat/1-Cool 24V Backlight

SKU CH-74PF-YR64D MPN PSP511LC

A 12-pack of 24V programmable thermostats with 5-2 day scheduling, four daily periods, backlight and keyboard lockout for 1-heat/1-cool systems

  • Rated voltage125VAC
  • Mounting styleWall Mount
  • Relay contactPSP511LC: 1 heat & 1 cool Stage, Backlight, 24 V
  • Product typeHeating and cooling, Mechanical knob
  • Size or dimensions5 in × 3.25 in × 1.5 in
  • Product colorWhite
  • Programmable 5-2 day schedule tailors comfort and saves energy
  • Exclusive speed dial makes programming quick and easy
  • Four daily periods per mode maximise heating and cooling efficiency
  • Keyboard lockout with 45°F to 90°F range gives precise control
  • 12-pack of 24V wall-mount units covers multiple zones

12-Pack Programmable Thermostat

The LUX PSP511LC is a 12-pack of programmable thermostats designed for residential heating and cooling systems. Each unit manages one heat and one cool stage using a mechanical knob interface. The 5-2 day scheduling allows separate weekday and weekend programs for tailored comfort. This bulk pack suits property managers or contractors outfitting multiple zones.

Wall-Mount Low-Voltage Design

Each thermostat measures 5 in x 3.25 in x 1.5 in and mounts directly to the wall in a white finish. The units operate on 24-volt relay contacts and require a 125VAC supply connection. Low-voltage wiring simplifies installation on compatible 24V systems. A backlit display ensures readability in low-light conditions.

Single-Stage 5-2 Day Scheduling

The PSP511LC supports up to four daily periods with independent heat and cool programs via the exclusive speed dial. Temperature range spans 45°F to 90°F with a keyboard lockout feature. It is not compatible with multi-stage heat pumps, multi-stage furnaces, three-wire hydronic or 120V/240V line-voltage systems without transformers.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $43.99
Typical for this category: the median of 1,762 items is $45.99.

Specifications

Product
Brand nameLUX, EME Americas Inc.
Model namePSP511LC
Part numberPSP511LC
Product typeHeating and cooling, Mechanical knob
Product colorWhite
Power
Rated voltage125VAC
Size & build
Size or dimensions5 in × 3.25 in × 1.5 in
Mounting styleWall Mount
In the box
Number of items12 pack
More details
Relay contactPSP511LC: 1 heat & 1 cool Stage, Backlight, 24 V

Questions about this item

What does the 24-volt rating mean for the relay contacts on this thermostat?

The 24-volt rating indicates the thermostat is designed for low-voltage HVAC systems and cannot be connected directly to 120V or 240V line voltage without a transformer.

Will the 5-inch by 3.25-inch by 1.5-inch unit cover the opening left by my old thermostat?

The thermostat measures 5 inches wide by 3.25 inches tall by 1.5 inches deep, so check your existing wall cutout against those dimensions before mounting.

How do I wire the 1-heat/1-cool stages on the PSP511LC, and what is the common mistake?

Connect the heating wire to the W terminal and the cooling wire to the Y terminal; the step often missed is ensuring the 24V common wire is attached to the C terminal for the backlight to function.

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