How to Install Leviton VPT24 Programmable Timer and LTB Series Countdown Timer Switches

Updated at: 23/05/2025

Leviton offers a range of programmable timers designed to enhance convenience and energy efficiency in your home. Whether you're aiming to automate lighting schedules, control appliances remotely, or simply add a layer of security with timed illumination, the VPT24 Programmable Timer and the LTB Series Countdown Timer Switches provide versatile solutions. These user-friendly devices offer a balance of advanced features and straightforward operation, making them suitable for both seasoned DIY enthusiasts and beginners alike. Understanding their installation is key to unlocking their full potential.

This guide will walk you through the installation process for both the Leviton VPT24 and LTB series timers, covering everything from initial preparation to final testing. We'll provide clear, step-by-step instructions with accompanying visuals to ensure a smooth and successful installation, allowing you to effortlessly integrate these timers into your home's electrical system. Let's get started!

Preparation and Safety Guidelines

Tools Needed
  • Flathead screwdriver
  • Phillips head screwdriver
  • Electrician pliers
  • Wire stripper
  • Electrical tape
  • Handheld voltage tester
  • Properly sized wire connectors
Safety Guidelines
  • Always turn off the power at the breaker box before beginning any wiring work. Failure to do so could result in serious injury or death.
  • Verify the voltage of your circuit matches the timer's specifications. Using an incompatible voltage can damage the timer and/or cause a fire.
  • If you are not comfortable working with electrical wiring, consult a qualified electrician. Improper installation can lead to safety hazards and void warranties.

Step-by-Step Instructions

  1. Safety First: Power Off and Verification

    • Turn off the power at the circuit breaker and use a voltage tester to ensure the power is completely off.
    Turn off the power at the circuit breaker and use a voltage tester to ensure the power is completely off.
    Safety First: Power Off and Verification

  2. Wire Identification and Preparation

    • Identify the hot wire using a voltage tester. Label the hot wire with electrical tape.
    • Identify whether the wiring application is single-pole or three-way. (This example shows a single-pole application.)
    • Prepare the wires for installation by removing a small piece of insulation from the pigtail leads on the timer switch and twisting the exposed stranded copper wiring clockwise.
    Prepare the wires for installation by removing a small piece of insulation from the pigtail leads on the timer switch and twisting the exposed stranded copper wiring clockwise.Prepare the wires for installation by removing a small piece of insulation from the pigtail leads on the timer switch and twisting the exposed stranded copper wiring clockwise.Prepare the wires for installation by removing a small piece of insulation from the pigtail leads on the timer switch and twisting the exposed stranded copper wiring clockwise.
    Wire Identification and Preparation

  3. Grounding and Wiring Connections

    • Connect the green ground lead to the green or bare copper wire in the wall box using a wire connector.
    • Connect the line wallbox wire to the black lead and the load wallbox wire to the red lead using wire connectors.
    • Connect the neutral wallbox wire to the white lead using a wire connector.
    Connect the neutral wallbox wire to the white lead using a wire connector.Connect the neutral wallbox wire to the white lead using a wire connector.Connect the neutral wallbox wire to the white lead using a wire connector.
    Grounding and Wiring Connections

  4. Securing Wires and Mounting

    • Dress the terminated wires with electrical tape to ensure stability.
    • Position all wires in the wall box, ensuring the word "top" is facing up on the device. Partially screw in the mounting screws.
    Position all wires in the wall box, ensuring the word "top" is facing up on the device. Partially screw in the mounting screws.Position all wires in the wall box, ensuring the word "top" is facing up on the device. Partially screw in the mounting screws.
    Securing Wires and Mounting

  5. Testing and Final Installation

    • Restore power at the circuit breaker and test the device. Press any timer button to turn the load on.
    • Turn off power, tighten mounting screws, and attach the wall plate. Restore power.
    Turn off power, tighten mounting screws, and attach the wall plate. Restore power.Turn off power, tighten mounting screws, and attach the wall plate. Restore power.
    Testing and Final Installation

Read more: Installing an Outdoor GFCI Receptacle: A Step-by-Step Guide

Tips

  • If unsure about any part of the instructions, contact an electrician.
  • Always turn off the power at the circuit breaker before working with electrical wiring.
  • Use a voltage tester to verify that the power is off before and after working on the wiring.
  • Twisting the exposed stranded copper wiring clockwise before connecting helps secure it in the wire connector.
  • Ensure that the ends of the wires from the wall box are straight and stripped approximately 5/8 of an inch before connecting.

Common Mistakes to Avoid

1. Incorrect Wiring

Reason: Connecting the wires to the wrong terminals on the timer switch can lead to malfunction or even damage to the appliance.
Solution: Carefully double-check the wiring diagram provided with the timer switch and match the wires to the corresponding terminals.

2. Ignoring Load Requirements

Reason: Using a timer switch with a load exceeding its rated capacity can cause overheating and potential fire hazards.
Solution: Always verify that the timer switch's amperage rating is sufficient for the connected appliance.

3. Improperly Setting the Timer

Reason: Incorrectly setting the on/off times or programming modes can lead to the timer not functioning as intended.
Solution: Refer to the timer switch's instruction manual for detailed steps on how to correctly set the desired on/off times and programming modes.

FAQs

Do I need to turn off the power before installing the Leviton timers?
Absolutely! Always turn off the power at the breaker box before working with any electrical wiring. This is crucial for safety to prevent electric shock.
What's the difference between the VPT24 and the LTB series timers?
The VPT24 is a programmable timer offering flexible scheduling options for various days and times. The LTB series is a countdown timer, ideal for applications needing a set duration of operation before automatic shutoff, like a bathroom exhaust fan.