IZT-2S24-D Advance Mark 7 Electronic Dimming Ballast - Two F24T5HO Analog-dim

What is the Philips Advance IZT-2S24-D analog dimming ballast?

The IZT-2S24-D is a Mark 7 0-10V series electronic dimming fluorescent ballast manufactured by Philips Advance (Signify). It is primarily engineered to operate one or two 24-watt T5HO (High Output) linear fluorescent lamps, offering critical advantages including continuous 100% to 1% dimming, programmed start ignition, and IntelliVolt universal voltage (120-277V). It is the optimal choice for architectural lighting, conference rooms, and commercial spaces utilizing energy management systems or daylight harvesting sensors.

Core Features and Technical Advantages

Selecting a Mark 7 0-10V dimming ballast ensures maximum energy savings and precise environmental control for your high-output fixtures. The primary features of the IZT-2S24-D include:

• 0-10V Analog Dimming: Provides smooth, continuous dimming from full brightness (100%) down to 1%. It integrates seamlessly with standard 0-10V architectural dimmers, daylight sensors, and building management systems via dedicated violet and gray control wires.
• Programmed Start Ignition: Safely preheats the lamp cathodes before applying starting voltage and maintains cathode heating during deep dimming. This prevents premature lamp failure and maximizes the lifespan of your T5HO tubes.
• IntelliVolt Technology: Automatically detects and adapts to any line voltage between 120V and 277V (50/60Hz), simplifying retrofits and eliminating the need to stock multiple voltage-specific dimming ballasts.

How to Verify Compatibility for Your Fixture

When evaluating the IZT-2S24-D for a commercial lighting repair or upgrade, assess the following criteria to ensure complete compatibility:

1. Lamp Type and Quantity: Confirm your fixture utilizes 24W T5 High Output (F24T5/HO) linear fluorescent tubes. This model is engineered to power either one or two of these specific lamps.
2. Dimming Control System: Verify that your building or fixture utilizes a standard 4-wire 0-10V analog dimming system. This ballast is not compatible with standard 2-wire phase-cut (incandescent-style) wall dimmers.
3. Physical Dimensions: Ensure the standard linear metal housing (16.7" L x 1.18" W x 1.0" H) securely fits within your fixture's internal ballast channel.

Frequently Asked Questions

What happens if I don't connect the violet and gray dimming wires?

If you install the IZT-2S24-D but leave the 0-10V control wires (violet and gray) unconnected and capped off, the ballast will default to operating the lamps at 100% full light output. It functions exactly like a standard non-dimming ballast until a dimming signal is introduced.

Can this ballast safely run just a single 24W lamp?

Yes, the IZT-2S24-D is fully capable of safely operating either one or two lamps. Installers should always consult the wiring diagram printed directly on the ballast label to ensure the proper capping of unused leads and correct circuit configuration for a 1-lamp setup.

Will this ballast dim standard-output T5 lamps?

No, this ballast is strictly engineered for the specific electrical and thermal requirements of 24-watt T5HO (High Output) lamps. It should not be used to power or dim standard-output T5 lamps (such as F14T5), as it will overdrive the lamps and cause rapid failure.