Intermatic ML88T 88-Watt Power Pack with Timer and Ground Shield Instruction Manual

1. Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of your Intermatic ML88T 88-Watt Power Pack with Timer and Ground Shield. This unit is designed to power 12-volt low voltage outdoor landscape lighting systems, offering automatic on/off functionality with a programmable timer and a manual override switch. Please read these instructions thoroughly before use to ensure safe and efficient operation.

2. Important Safety Information

WARNING: RISK OF FIRE OR ELECTRIC SHOCK. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS INJURY OR DEATH.

• This power pack is designed for OUTDOOR USE ONLY.
• Mount the unit more than 3 inches (10 feet) from the inside wall of a swimming pool, spa, or hot tub.
• Do not use this product with submersible luminaries or pumps.
• Do not connect to other power supplies in parallel.
• Do not use with dimmers.
• Ensure all wiring connections are secure and properly insulated.
• Use only solid and stranded type wire rated under one screw terminal.
• The total wattage of connected lighting must NOT EXCEED 88 WATTS.
• This unit features surge-resistant construction and is double insulated for safety.
• Always disconnect power before performing any installation, maintenance, or troubleshooting.

3. Setup and Installation

3.1 Mounting the Power Pack

Select a suitable outdoor location for mounting the power pack. The location should be protected from direct heavy rain if possible, and adhere to the safety guidelines regarding proximity to water bodies.

• Mount the unit securely to a wall or post using appropriate hardware (not included).
• Ensure the unit is mounted vertically with the cord facing downwards to prevent water ingress.

3.2 Wiring Connections

The ML88T features screw terminals for connecting your low voltage landscape lighting system.

Image 1: Rear view of the ML88T Power Pack, highlighting the wiring terminals and important safety labels. The power cord exits from the bottom, and the low voltage output terminals are visible at the base.

1. Ensure the power pack is unplugged from the main power supply.
2. Open the terminal cover at the bottom of the unit.
3. Connect the low voltage wires from your landscape lighting system to the screw terminals. Use solid or stranded type wire.
4. Strip approximately 1/2 inch of insulation from the wire ends before inserting them into the terminals.
5. Tighten the screws firmly to ensure a secure connection.
6. Close the terminal cover.
7. Plug the power pack into a grounded outdoor electrical outlet.

4. Operating Instructions

The ML88T features a mechanical timer for automatic operation and a manual ON/OFF override switch.

Image 2: Front view of the ML88T Power Pack, displaying the mechanical timer dial with 24-hour markings and the manual ON/OFF override switch located above the dial.

4.1 Setting the Current Time

1. Rotate the inner dial clockwise until the current time aligns with the 'TIME' arrow indicator. The dial is marked for 24 hours (12 AM to 12 PM).

4.2 Programming the Timer

The timer uses small, removable trippers to set the ON and OFF times. Two sets of trippers are included.

1. Insert the 'ON' tripper (typically red or a distinct color) into the desired ON time slot on the outer edge of the dial.
2. Insert the 'OFF' tripper (typically black or a distinct color) into the desired OFF time slot.
3. Ensure the trippers are securely seated in the dial. The timer will activate and deactivate the lighting system according to these settings.

4.3 Manual ON/OFF Override

A manual ON/OFF switch is located above the timer dial. This switch allows you to override the programmed timer settings.

• To turn the lights ON manually, push the switch to the 'ON' position.
• To turn the lights OFF manually, push the switch to the 'OFF' position.
• To return to programmed timer operation, set the switch to the 'TIMER' position (usually the center position).

5. Maintenance

Regular maintenance ensures the longevity and optimal performance of your power pack.

• Cleaning: Periodically wipe the exterior of the unit with a damp cloth to remove dirt and debris. Do not use abrasive cleaners or immerse the unit in water.
• Connection Check: Annually inspect all wiring connections for tightness and corrosion. Loose connections can lead to poor performance or safety hazards.
• Environmental Check: Ensure the unit remains free from obstructions and is not exposed to excessive moisture or extreme temperatures beyond its operating range.

6. Troubleshooting

6.1 Lights Not Turning On

• Check Power: Ensure the power pack is securely plugged into a working electrical outlet.
• Manual Override: Verify the manual ON/OFF switch is in the 'TIMER' or 'ON' position.
• Timer Setting: Confirm the current time is set correctly and the ON tripper is in the desired position.
• Wiring: Inspect the low voltage wiring connections at the power pack and to the lights for any loose or corroded wires.
• Bulbs: Check if the landscape light bulbs are functional.
• Overload: Ensure the total wattage of connected lights does not exceed 88 watts. An overload can trip internal protection.

6.2 Timer Not Functioning

• Power: Confirm the unit is receiving power.
• Trippers: Ensure the ON and OFF trippers are correctly inserted and positioned on the dial.
• Manual Override: Make sure the manual switch is in the 'TIMER' position.

6.3 Buzzing Sound

A slight humming or buzzing sound from the transformer is normal during operation. However, if the buzzing is excessively loud or accompanied by other issues (e.g., lights flickering, unit overheating), disconnect power immediately and contact customer support.

7. Specifications

8. Warranty and Support

8.1 Warranty Information

The Intermatic ML88T Power Pack is covered by a 5-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.

8.2 Customer Support

For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Intermatic customer support. Refer to the official Intermatic website or product packaging for current contact information.