Intermatic MIL72ASTUZ-120 24-Hour Electromechanical Time Control User Manual

1. Introduction

The Intermatic MIL72ASTUZ-120 is a robust 24-hour electromechanical time control module designed for precise scheduling of electrical circuits. This timer is suitable for light-duty commercial applications operating at 120 VAC, including lighting, HVACR systems, pumps, motors, fan controls, access controls, and general-purpose electrical circuits. It offers flexible mounting options for surface or DIN rail installation within a control panel.

2. Safety Information

WARNING: Risk of electric shock. Disconnect power at the circuit breaker or fuse box before installing or servicing this device. Installation should be performed by a qualified electrician in accordance with all national and local electrical codes.

• Ensure the power supply matches the timer's voltage rating (120 VAC).
• Do not exceed the maximum load ratings specified for the device.
• Keep the device away from water and excessive moisture.
• Do not attempt to open or repair the unit. Refer servicing to qualified personnel.

3. Product Overview

The MIL72ASTUZ-120 features an intuitive analog dial for setting schedules and a durable casing for secure mounting.

Figure 1: Intermatic MIL72ASTUZ-120 Front View
The image displays the front of the Intermatic MIL72ASTUZ-120 timer. It features a circular black dial with white markings for 24 hours (AM and PM). The dial has small white pins around its circumference, which are used for setting ON/OFF times. A central white hour hand and a smaller minute hand indicate the current time. The 'INTERMATIC' logo is visible at the bottom of the dial. The timer is housed in a white, square-shaped casing with a clear protective cover.

Key Components:

• 24-Hour Dial: Displays the current time and allows for setting ON/OFF periods.
• Setting Pins: Small, removable/insertable pins around the dial used to define ON and OFF switching times.
• Time Hands: Indicate the current time (hour and minute).
• Manual Override Switch: (If present, typically a 3-position switch for ON, AUTO, OFF).
• Terminal Block: For electrical connections.
• Mounting Points: For surface or DIN rail installation.

4. Setup

4.1 Mounting

The MIL72ASTUZ-120 can be mounted on a surface or a DIN rail inside a control panel.

• Surface Mount: Use appropriate screws to secure the timer to a flat surface through the designated mounting holes.
• DIN Rail Mount: Attach the timer to a standard DIN rail by snapping it into place. Ensure it is securely fastened.

4.2 Wiring

All wiring must comply with national and local electrical codes. Refer to the wiring diagram provided with the unit for specific connections. A typical wiring configuration involves:

1. Connect the incoming 120 VAC Line (L1) to the designated terminal.
2. Connect the Neutral conductor to the designated terminal.
3. Connect the Load (device to be controlled) to the appropriate switched terminal.

Ensure all connections are tight and secure. After wiring, replace any covers or enclosures before restoring power.

4.3 Setting Current Time

Rotate the 24-hour dial clockwise until the current time aligns with the time indicator arrow (usually a small triangle or line on the timer's housing). Ensure to differentiate between AM and PM hours correctly.

5. Operating

5.1 Setting ON/OFF Times

The timer uses small pins around the dial to set the ON and OFF switching times.

• To set an ON time: Push an 'ON' pin (typically a darker color or marked) inwards towards the center of the dial at the desired ON time.
• To set an OFF time: Push an 'OFF' pin (typically a lighter color or unmarked) outwards from the center of the dial at the desired OFF time.
• Each pin represents a specific time increment (e.g., 15 minutes). Ensure pins are firmly set.

5.2 Manual Override

If your unit includes a manual override switch, it typically has three positions:

• ON: Keeps the controlled device continuously ON, overriding the set schedule.
• AUTO: Allows the timer to operate according to the programmed schedule.
• OFF: Keeps the controlled device continuously OFF, overriding the set schedule.

Return the switch to the 'AUTO' position for normal scheduled operation.

6. Maintenance

The MIL72ASTUZ-120 is designed for minimal maintenance.

• Cleaning: Periodically wipe the exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Battery: The unit contains a non-replaceable Nickel Metal Hydride battery. This battery maintains timekeeping during power outages. No user maintenance is required for the battery.
• Inspection: Occasionally inspect wiring connections for tightness and signs of wear.

7. Troubleshooting

If troubleshooting steps do not resolve the issue, contact Intermatic customer support or a qualified electrician.

8. Specifications

9. Warranty and Support

For warranty information, technical support, or further assistance, please refer to the official Intermatic website or contact their customer service department. Keep your purchase receipt for warranty claims.

Intermatic Website: www.intermatic.com