Intermatic FM1STUZH-120U Electromechanical Timer Module Instruction Manual

1. Introduction

The Intermatic FM1STUZH-120U Electromechanical Timer Module is designed for integration into machine control panels, circuit boards, or other equipment. This module provides 24-hour scheduling with a 21 Amp switching capacity, suitable for controlling various electrical loads. Applications include heating, ventilation, air conditioning, refrigeration, lighting, security systems, circulating pumps, spas, and other OEM applications requiring precise 24-hour timing. The unit features a manual override switch for flexible operation.

2. Features

• Voltage and Switch: 120 VAC, 21 Amp SPDT (Single Pole Double Throw) switch.
• Timing: 24-Hour operation with 96 captive trippers, allowing 15-minute interval settings.
• Manual Override: Integrated switch for manual control (ON, AUTO, OFF).
• Connections: 1/4-inch quick-connect terminals for easy wiring.
• Durability: Noise immune design, suitable for robust industrial and commercial applications.
• Drive: Synchronous drive mechanism.
• Ease of Use: Clear clock face for straightforward time setting.
• Compact Design: Small footprint for versatile installation.
• Optional Cover: Compatible with clear plastic cover (DC-FME-A, sold separately).

3. Specifications

Note: Specifications are subject to change without notice.

4. Installation

Safety First: Before beginning any installation, ensure that the main power supply to the circuit is disconnected at the breaker or fuse box to prevent electrical shock.

1. Mounting: The FM1STUZH-120U is designed for panel mounting. Secure the timer module firmly within the machine control panel, circuit board, or other designated equipment using appropriate fasteners.
2. Wiring: Connect the electrical leads to the 1/4-inch quick-connect terminals. Refer to the wiring diagram below for correct terminal connections. Ensure all connections are secure and properly insulated.
3. Verify Connections: Double-check all wiring against the diagram to ensure proper installation and prevent damage to the unit or connected equipment.
4. Restore Power: Once installation is complete and verified, restore power to the circuit.

Image 1: Manual page showing features, ratings, and wiring connections for the FM1STUZH-120U timer module. This diagram illustrates the physical dimensions and electrical specifications.

Image 2: Manual page detailing various timer module specifications, including a diagram of product dimensions and terminal connections. It also shows the 3-way manual override switch operation.

5. Operation

Image 3: Front view of the Intermatic FM1STUZH-120U Electromechanical Timer Module, showing the clock face, captive trippers, and manual override switch.

1. Setting Current Time: Rotate the clock dial in the direction of the arrow until the current time aligns with the time indicator mark. The clock face is marked with AM/PM for clarity.
2. Setting ON/OFF Times: The timer features 96 captive trippers around the dial, each representing 15 minutes. To set an ON period, push the trippers outwards for the desired duration. To set an OFF period, leave the trippers in their inward position.
3. Manual Override Switch: The module includes a 3-way override switch (often labeled ON, AUTO, OFF or similar symbols).
   • ON Position: Forces the connected load to remain ON, overriding the programmed schedule.
   • AUTO Position: Allows the timer to operate according to the programmed ON/OFF schedule.
   • OFF Position: Forces the connected load to remain OFF, overriding the programmed schedule.

6. Maintenance

The Intermatic FM1STUZH-120U Electromechanical Timer Module is designed for reliable, long-term operation with minimal maintenance. Regular inspection of wiring connections for tightness and signs of wear is recommended. Keep the unit free from dust and debris. No user-serviceable parts are inside; refer to qualified personnel for any repairs beyond basic installation and operation.

7. Troubleshooting

• Timer Not Operating: Check the power supply to the module. Ensure the manual override switch is in the 'AUTO' position. Verify that the captive trippers are correctly set for ON periods.
• Load Not Switching: Confirm that the load is properly connected to the timer's output terminals. Check the load itself for functionality. Ensure the timer is receiving power and the internal mechanism is rotating.
• Incorrect Timing: Verify that the current time is accurately set on the dial. Ensure the ON/OFF trippers are correctly positioned for the desired schedule.
• Intermittent Operation: Inspect all wiring connections for looseness or corrosion. Ensure the operating environment is within the specified temperature range.

If issues persist after performing these checks, contact Intermatic customer support or a qualified electrician.

8. Warranty and Support

For warranty information, technical support, or service inquiries regarding your Intermatic FM1STUZH-120U Electromechanical Timer Module, please refer to the official Intermatic website or contact their customer service department directly. Keep your purchase receipt as proof of purchase for warranty claims.

Intermatic Contact Information:
Website: www.intermatic.com
Refer to the website for current contact numbers and support resources.