Comprehensive Guide: How to Put Trane into Test Mode

Putting a Trane unit into test mode is a crucial step for DIY users and HVAC technicians to diagnose and troubleshoot various issues. This comprehensive guide will provide you with advanced, hands-on details and technical specifications to effectively put your Trane unit into test mode.

Identify the Low Voltage Terminal Board (LVTB)

The first step in the process is to locate the LVTB, which is typically found near the control board of your Trane unit. The LVTB is the central hub where various low-voltage connections are made, and it is where you will find the terminals labeled “TEST 1” and “TEST 2.”

The LVTB is usually a rectangular-shaped terminal board with multiple screw terminals, and it may be color-coded for easier identification. It is important to carefully inspect the board and ensure that you have correctly identified the TEST 1 and TEST 2 terminals before proceeding.

Place a Jumper

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Once you have located the LVTB and identified the TEST 1 and TEST 2 terminals, the next step is to connect a jumper wire between these two terminals. This action will initiate the test mode on your Trane unit.

When connecting the jumper, ensure that the wire is securely in place and that there are no loose connections. It is recommended to use a high-quality, insulated jumper wire to minimize the risk of short circuits or other electrical issues.

Observe the Unit’s Behavior

After placing the jumper, the Trane unit will enter the test mode and begin cycling through various settings and modes. During this time, you should observe the unit’s behavior closely, taking note of any changes in its operation.

The unit will typically run in each mode for approximately 30 seconds, allowing you to monitor the system’s performance, check for error codes, and ensure that all components are functioning correctly.

It is important to be patient during this process, as the unit will cycle through all the available test functions. This can take several minutes, depending on the specific model and the number of test modes available.

Manually Advance the Test Functions

To manually advance to the next test function, you can remove the jumper wire for a five-count and then replace it for another five-count. This process will help you navigate through the different test modes and focus on the specific functions you need to observe.

By removing and replacing the jumper, you can control the pace of the test mode, allowing you to spend more time on critical areas or troubleshoot specific issues.

Check for Indicator Lights

During the test mode, you should also keep an eye out for any indicator lights on the Trane unit, such as the RTRM (Roof Top Unit Relay Module) or UPC (Unit Protection Control) lights.

These lights will typically flash or blink to indicate that the unit is in the test mode, providing you with a visual confirmation that the test mode has been successfully initiated.

Utilize Decade Boxes for Accurate Testing

For more advanced troubleshooting and testing, it is recommended to use a decade box, which is a variable resistance device. By connecting the decade box to the appropriate terminals on the LVTB, you can simulate various resistance values and observe the unit’s response.

This technique allows you to perform more precise tests, such as checking the operation of sensors, thermistors, and other components that rely on resistance-based measurements.

Trane Intellipak and RTU Test Mode Videos

For a visual guide on the test mode process, you can refer to the following videos:

  1. TRANE INTELLIPAK SERVICE TEST MODE: This video demonstrates the test mode procedure for a Trane Intellipak unit, providing step-by-step instructions and explanations.

  2. Trane RTU Test Mode: These videos show the test mode process for a Trane Roof Top Unit (RTU), with detailed explanations of the unit’s behavior during testing.

Patience and Attention to Detail

Remember that working with test modes requires patience and attention to detail. The Trane unit will cycle through all the available test functions, and it is important to observe the system’s behavior carefully to identify any issues or anomalies.

By following the steps outlined in this comprehensive guide and utilizing the available resources, you can effectively put your Trane unit into test mode and perform thorough diagnostics and troubleshooting.


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