Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Intermatic T171 SPST 24 Hour 125-Volt Time Switch. The T171 is designed for direct 24-hour control of electrical loads, offering reliable scheduling with up to 10 ON/OFF operations per day. It features a durable steel enclosure suitable for indoor use.
Safety Information
WARNING: Risk of electric shock. This device operates on 125 Volts AC. Installation and servicing should only be performed by a qualified electrician. Always turn off power at the main circuit breaker or fuse box before installing or servicing the time switch.
- Ensure all local and national electrical codes are followed during installation.
- Do not connect aluminum wires directly to the switch terminals. Use appropriate copper-to-aluminum connectors if necessary.
- Verify the voltage supply matches the switch's rating (125 VAC).
- Keep the enclosure closed and secured after installation to prevent accidental contact with live parts.
Product Overview
The Intermatic T171 time switch consists of a robust steel enclosure housing the mechanical timer mechanism and electrical terminals. Understanding its components is key to proper installation and operation.
Figure 1: Internal Components. This image displays the internal layout of the T171 time switch. Key components include the large yellow 24-hour dial for setting time and programs, the manual ON/OFF lever, and the clearly labeled wiring terminals for Neutral (A), Line (1), and Load (2). A caution label reminds users to turn off power before servicing and not to remove the insulator.
Figure 2: External Enclosure. This image shows the robust gray steel enclosure of the Intermatic T171 time switch. The enclosure is designed for indoor wall mounting and provides protection for the internal components. The Intermatic logo is embossed on the front cover.
Setup and Installation
Proper installation is critical for the safe and effective operation of your time switch. This device is designed for wall mounting.
- Power Disconnection: Before beginning any installation, ensure the main power supply to the circuit where the time switch will be installed is turned OFF at the circuit breaker or fuse box. Verify with a voltage tester.
- Mounting: Select a suitable indoor location for wall mounting. Secure the steel enclosure firmly to a wall stud or use appropriate wall anchors. The dimensions are approximately 5.13 inches wide by 7.88 inches high by 3.44 inches deep.
- Wiring: Refer to the wiring diagram inside the enclosure (see Figure 1). Connect the electrical wires to the clearly labeled terminals:
- Neutral (A): Connect the neutral wire from your power supply.
- Line (1): Connect the hot (live) wire from your 125 VAC power supply.
- Load (2): Connect the wire leading to the device or circuit you wish to control.
Important: This switch is designed for copper conductors. Do not connect aluminum wires directly to the switch terminals. If aluminum wiring is present, use approved copper-to-aluminum connectors.
- Insulator: Ensure the protective insulator over the wiring terminals is properly in place after wiring. Do not remove this insulator permanently.
- Enclosure Closure: Close and secure the front cover of the enclosure.
- Power Restoration: Restore power at the main circuit breaker.
Operating Instructions
The T171 time switch allows for precise scheduling of electrical loads.
- Setting Current Time:
Rotate the large yellow 24-hour dial clockwise until the current time aligns with the "TIME SET" arrow located at the top of the dial. The dial is marked with AM/PM indicators.
- Setting ON/OFF Operations:
The dial has small segments around its perimeter. To set an ON time, push an "ON" tripper (usually green or silver) into the desired time slot on the dial. To set an OFF time, push an "OFF" tripper (usually red or black) into the desired time slot. The T171 supports 1 to 10 ON/OFF operations per day. The minimum ON or OFF time is 1 hour.
Note: Trippers are typically supplied with the unit. Additional trippers may be purchased separately if needed for more operations.
- Manual Override:
A manual lever is provided on the mechanism (see Figure 1). This lever allows you to temporarily override the programmed schedule. Move the lever to the "ON" or "OFF" position as desired. The timer will resume its programmed schedule at the next scheduled ON or OFF event.
- Skip-A-Day Feature:
The T171 is a "24 Hour with Skip A Day" type timer. This feature allows you to prevent the timer from operating on specific days of the week. Consult the detailed instructions provided with your specific unit for setting the skip-a-day pins or segments, if applicable. This typically involves setting small pins on the outer edge of the dial corresponding to days you wish to skip.
Maintenance
The Intermatic T171 time switch is designed for long-term, reliable operation with minimal maintenance.
- Cleaning: Periodically wipe the exterior of the enclosure with a clean, dry cloth. Do not use abrasive cleaners or solvents. Ensure power is off before cleaning the interior if necessary.
- Inspection: Annually inspect the wiring connections for tightness and signs of wear or corrosion. Ensure the enclosure remains securely mounted.
- No User Serviceable Parts: The internal mechanism is not user-serviceable. If the unit malfunctions, contact a qualified electrician or Intermatic customer support.
Troubleshooting
If your Intermatic T171 time switch is not functioning as expected, consider the following common issues:
| Problem | Possible Cause | Solution |
|---|---|---|
| Timer does not operate. | No power to the unit; incorrect wiring; tripped circuit breaker. | Check power supply at the breaker. Verify wiring connections (ensure power is off before inspecting). |
| Load does not turn ON/OFF at programmed times. | Trippers incorrectly set; manual override engaged; incorrect current time setting. | Ensure trippers are firmly in place at desired times. Check manual lever position. Verify current time is accurately set on the dial. |
| Timer runs but load doesn't respond. | Load device malfunction; loose load wiring. | Test the load device independently. Check load wiring connection at the timer (power off). |
| Timer makes unusual noises. | Internal mechanical issue. | Discontinue use and contact a qualified electrician or Intermatic support. |
If these steps do not resolve the issue, contact a qualified electrician or Intermatic customer support for further assistance.
Specifications
| Attribute | Detail |
|---|---|
| Model Number | T171 |
| Voltage | 125 VAC |
| Switch Type | SPST (Single Pole, Single Throw) |
| Maximum Load Current | 40 Amps per pole |
| Operations per Day | 1 to 10 ON/OFF operations |
| Minimum ON/OFF Time | 1 Hour |
| Enclosure Material | Steel |
| Enclosure Type | Type 1 Indoor Enclosure |
| Product Dimensions (H x W x D) | 7.88" x 5.13" x 3.44" |
| Item Weight | 2.7 Pounds |
| Certifications | UL (Canada and US), CSA (Canada and US) |
Warranty Information
The Intermatic T171 time switch comes with a manufacturer's warranty. For specific details regarding the warranty period, coverage, and terms and conditions, please refer to the warranty description provided by Intermatic Incorporated, typically included with the product packaging or available on the official Intermatic website. Please retain your proof of purchase for warranty claims.
Support
For technical assistance, troubleshooting beyond this manual, or inquiries regarding parts and service, please contact Intermatic customer support. You can typically find contact information, including phone numbers and website details, on the product packaging or on the official Intermatic website (www.intermatic.com).
When contacting support, please have your product model number (T171) and purchase information readily available.
