HILTI 338720 DSC Foam Dispenser Instruction Manual

1. Introduction

This manual provides essential information for the safe and effective use of the HILTI 338720 DSC Foam Dispenser. This tool is designed for precise application of Hilti firestop foams, crucial for creating effective fire barriers in various construction applications. Please read this manual thoroughly before operating the dispenser to ensure proper handling, optimal performance, and user safety.

The HILTI 338720 DSC Foam Dispenser is engineered for durability and control, facilitating the application of specialized firestop materials to seal penetrations and gaps in fire-rated assemblies. Adherence to these instructions will help maintain the dispenser's functionality and ensure compliance with fire safety standards.

2. Safety Instructions

WARNING: Failure to follow these safety instructions may result in serious injury or property damage.

• Always wear appropriate Personal Protective Equipment (PPE), including safety glasses, gloves, and respiratory protection, when handling firestop foams and operating the dispenser.
• Ensure adequate ventilation in the work area to prevent inhalation of foam vapors.
• Keep the dispenser and foam canisters away from open flames, heat sources, and direct sunlight. Foam propellants are flammable.
• Do not puncture, incinerate, or expose foam canisters to temperatures above 50°C (122°F).
• Keep out of reach of children and unauthorized personnel.
• Do not modify the dispenser or use it for purposes other than its intended application.
• Dispose of empty foam canisters and waste materials according to local regulations.

3. Setup

3.1 Unpacking and Inspection

Carefully remove the HILTI 338720 DSC Foam Dispenser from its packaging. Inspect the dispenser for any signs of damage. If any damage is observed, do not use the dispenser and contact Hilti customer support.

3.2 Attaching the Foam Canister

1. Shake the Hilti firestop foam canister vigorously for at least 20-30 seconds to ensure proper mixing of components.
2. Remove the protective cap from the foam canister valve.
3. Screw the foam canister firmly onto the dispenser's adapter. Ensure a tight seal to prevent leakage. Do not overtighten.
4. Hold the dispenser with the canister upright for a few moments before use.

Image 1: HILTI 338720 DSC Foam Dispenser with a foam canister attached. The image shows the ergonomic handle, trigger mechanism, and the threaded adapter where the foam canister connects.

3.3 Preparing the Application Area

Ensure the surfaces where the foam will be applied are clean, dry, and free from dust, grease, or loose particles. For optimal adhesion and curing, lightly moisten porous surfaces with water using a spray bottle, as recommended by the specific Hilti firestop foam product data sheet.

4. Operating Instructions

4.1 Dispensing Foam

1. Hold the dispenser with the canister inverted (valve down) during application.
2. Adjust the flow control knob (if present) to the desired foam output. Start with a lower setting and increase as needed.
3. Aim the nozzle at the application area and gently press the trigger to dispense foam.
4. Apply foam in layers, filling gaps and penetrations as required by the firestop system design. Do not overfill, as foam expands significantly.
5. Release the trigger to stop the foam flow.

4.2 Controlling Flow and Application

The HILTI 338720 DSC Foam Dispenser allows for precise control of foam output. The trigger mechanism provides immediate on/off control, while the flow adjustment screw (typically located at the back of the handle) regulates the volume of foam dispensed. Practice on a scrap surface to familiarize yourself with the dispenser's response and the expansion rate of the specific foam being used.

4.3 Curing Time

Refer to the technical data sheet of the specific Hilti firestop foam product for information on tack-free time, cuttable time, and full cure time. Do not disturb the applied foam until it has adequately cured.

5. Maintenance

5.1 Cleaning the Dispenser

Proper cleaning is crucial for the longevity and performance of your HILTI 338720 DSC Foam Dispenser. After each use, or if the dispenser will not be used for an extended period, clean it thoroughly:

1. Remove the foam canister from the dispenser.
2. Immediately attach a Hilti foam cleaner canister to the dispenser.
3. Dispense cleaner through the nozzle until only clear cleaner liquid emerges.
4. Allow the cleaner to sit in the dispenser for a few minutes, then dispense again.
5. Remove the cleaner canister and wipe down the exterior of the dispenser with a cloth.
6. If foam has cured on the nozzle or adapter, carefully remove it using a suitable solvent or mechanical means, taking care not to damage the dispenser.

5.2 Storage

Store the cleaned dispenser in a dry, cool place, away from direct sunlight and extreme temperatures. If a foam canister is left attached for short periods (e.g., overnight), ensure the flow control knob is fully closed to prevent curing within the nozzle.

6. Troubleshooting

7. Specifications

• Model: HILTI 338720 DSC Foam Dispenser
• Manufacturer: Hilti
• Item Weight: Approximately 1 pound (0.45 kg)
• Compatibility: Designed for use with Hilti firestop foam canisters.
• Intended Use: Application of firestop foams in construction for sealing penetrations and gaps.

8. Warranty and Support

Hilti products are backed by a comprehensive warranty. For specific warranty details pertaining to the HILTI 338720 DSC Foam Dispenser, please refer to the warranty documentation provided at the time of purchase or visit the official Hilti website. For technical assistance, troubleshooting beyond this manual, or to inquire about replacement parts, please contact Hilti customer support directly. Contact information can typically be found on the Hilti website or on your product packaging.