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Trane TRR2928 Transformer 24VAC

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1  Review Add Your Review
Special Price $87.77 Regular Price $100.93
In stock
SKU
TRR2928
The Trane TRR2928 Transformer that is designed to be used only with Trane Heating and Air Conditioning systems. It measures 6.5” long device steps down line to 24 volts AC. The lower voltage is used for the HVAC unit’s many control circuits to ensure that elements such as the relays and thermostats are functioning correctly. Your Trane HVAC is more complex and functions with less friction than the transformer which provides a constant low-voltage supply. The building construction design and the heating and cooling components can be relied upon.
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HVAC Controls & Electrical, Transformers
Manufacturer:
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Specifications

  • Length: 6.5"
  • Voltage-Secondary: 24 V
  • Weight: 2.29lbs
Manufacturer Name: Trane
Product Number: TRR2928
OEM Part Number: TRR2928
Product Description: Transformer 24Vac
Weight:2.29lbs/1038.73g

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Product Questions (2)
Customer Questions
What maintenance is required for the Trane TRR2928 Transformer?

Inspect the transformer periodically for loose wiring connections, overheating marks, or insulation damage on the terminals. Ensure the unit is securely mounted and free from dust or moisture buildup that could affect performance. Verify that input and output voltages remain stable during operation to ensure accurate supply to control circuits. Always disconnect power before servicing to prevent electrical shock and equipment damage.

What are common issues with the Trane TRR2928 Transformer?

  • No output due to internal winding failure.
  • Overheating from electrical overload or poor ventilation.
  • Voltage fluctuations causing HVAC control instability.
  • Buzzing noise or loose wiring connections.
  • Intermittent power loss under load conditions.

Installation Steps

Step 1: Turn off main power and verify zero voltage for safety.

Step 2: Mount the transformer securely inside the HVAC control panel using screws or bracket.

Step 3: Connect primary leads to the correct input voltage terminals per wiring diagram.

Step 4: Connect secondary leads to thermostat or control circuit.

Step 5: Tighten all connections, secure wiring, and restore power carefully to test output.