Intermatic T104 24-Hour Mechanical Timer Switch User Manual

Product Overview

The Intermatic T104 24-Hour Mechanical Timer Switch is designed for industrial, commercial, and residential applications. It provides direct 24-hour control for various loads, including lights, pumps, fans, and HVAC systems. This heavy-duty timer switch can handle electrical loads up to 40 A per pole and allows for up to 12 ON/OFF operations per day. A manual override switch offers additional convenience. The Type 1 rated gray metal enclosure is suitable for secure indoor mounting.

Key Features:

Double Pole, Single Throw (DPST): Controls both legs of a 208–277V circuit and supports heavy-duty loads up to 40 Amps, including motors up to 5 HP at 240V—ideal for high-voltage, high-demand systems.
24-Hour Mechanical Scheduling: Built-in analog control enables up to 12 ON/OFF cycles per day with 1-hour minimum intervals—ideal for daily automation of commercial lighting, pumps, HVAC compressors, and equipment.
Industrial-Grade Metal Enclosure: Type 1 rated gray steel housing is designed for secure indoor mounting in mechanical rooms, control panels, or electrical closets.
Trippers Included for Quick Setup: Comes complete with one ON and one OFF tripper for basic scheduling; supports up to 12 programmable events per 24 hours for maximum control flexibility.
Wide-Range Load Compatibility: Rated for resistive, inductive, ballast, and motor loads from 120–277V; CSA and UL listed for reliability in residential, commercial, and green energy applications.

Setup and Installation

Installation of the Intermatic T104 timer switch should be performed by a qualified electrician in accordance with all local and national electrical codes. Ensure power is disconnected at the main panel before servicing this switch or the equipment it controls.

Wiring Instructions:

The T104 is a Double Pole, Single Throw (DPST) switch. It controls two separate circuits or both lines of a 208-277V circuit. Refer to the wiring diagram located inside the enclosure for specific connections. Do not connect aluminum wires to switch terminals.

Turn OFF power at the main panel before servicing.
Open the timer enclosure.
Identify the LINE (incoming power) and LOAD (outgoing power to appliance) terminals.
Connect wires securely to the appropriate terminals. Ensure all connections are tight.
Replace the insulator cover after wiring to prevent accidental contact.

Intermatic T104 Timer Switch with open enclosure showing internal components and wiring diagram

Image: Internal view of the Intermatic T104 timer switch, highlighting the wiring terminals and the clock dial. The inside cover displays the wiring diagram and safety warnings.

Image: Another internal view of the Intermatic T104 timer switch, providing a clearer look at the wiring instructions and the clock motor specifications on the left panel.

Setting the Time:

Pull out the clock dial slightly.
Turn the dial clockwise until the current time aligns with the "SET TIME" arrow.
Push the dial back in to engage the mechanism.

Setting ON/OFF Times:

The timer comes with one ON (green) and one OFF (red) tripper.
To set an ON or OFF time, loosen the screw on the tripper.
Slide the tripper to the desired time on the clock dial.
Tighten the screw to secure the tripper in place.
Additional trippers (sold separately) can be added for up to 12 ON/OFF operations per day.

Close-up of Intermatic T104 Timer Switch dial with ON and OFF trippers

Image: A detailed view of the yellow clock dial on the Intermatic T104, showing the "ON" and "OFF" trippers and the "SET TIME" indicator. This is where users set their desired operation schedules.

Operating Instructions

Manual Override:

The timer switch features a manual override lever. This lever allows you to temporarily turn the connected equipment ON or OFF without affecting the programmed schedule. Simply slide the lever to the desired position (ON or OFF). The timer will resume its programmed schedule at the next ON or OFF tripper event.

Video: This video provides an overview of Mechanical Time Switches, demonstrating their features and basic operation, including the manual override function.

Maintenance

The Intermatic T104 is designed for durability and requires minimal maintenance. Periodically inspect the enclosure for any signs of damage or corrosion. Ensure the enclosure door is securely latched to protect internal components from dust and moisture. Keep the clock dial and trippers free from debris to ensure smooth operation.

If the clock motor stops turning, it may need replacement. The internal mechanism can often be replaced without needing to replace the entire enclosure.

Troubleshooting

Equipment not turning ON/OFF at programmed times:
- Check if the ON/OFF trippers are securely fastened and positioned correctly on the dial.
- Ensure the current time on the dial is accurately set.
- Verify that the manual override lever is not in a position that prevents automatic operation.
- Confirm that power is supplied to the timer switch.
Clock dial not moving:
- This indicates a potential issue with the clock motor. The motor may need to be replaced.
- Ensure the dial is pushed in fully after setting the time.
Loose trippers:
- Tighten the tripper screws. Avoid overtightening to prevent damage to the dial. Finger-tightening is usually sufficient to keep them snug.

Specifications

Attribute	Value
Brand	Intermatic
Model Number	T104
Color	Gray
Material	Metal
Product Dimensions	3"D x 5"W x 7.75"H
Item Weight	12.8 ounces (0.8 Pounds)
Number of Settings	12 (ON/OFF operations per day)
Voltage Compatibility	208–277 VAC (Clock Motor), 120–480 VAC (Resistive), 120–277V AC (Inductive/Tungsten)
Amperage	Up to 40 Amps per pole
Horsepower Ratings	5 HP (28 FLA)-240V AC; 2 HP (24 FLA)-120V AC
Certifications	CSA and UL listed

Warranty and Support

Intermatic products are designed for reliability and durability. For specific warranty information regarding your T104 Mechanical Timer Switch, please refer to the documentation included with your product or visit the official Intermatic website.

Protection Plans:

3-Year Protection Plan: Available for purchase.
4-Year Protection Plan: Available for purchase.
Complete Protect: Monthly plan covering eligible past and future purchases.

For further assistance, technical support, or to explore other Intermatic products, please visit the Intermatic Store on Amazon.

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Intermatic T104