Trane TRR1104 Transformer

When high-side component failures or internal shorts compromise your low-voltage control circuit, the Trane TRR1104 Transformer provides a heavy-duty, field-ready replacement for furnace and air handler systems. This genuine OEM Trane replacement part (also referenced as TRR01104) is engineered for step-down applications, converting 200/230V primary input voltage to a stable 24V secondary output. Rated at 75VA (Volt-Amps), this transformer offers a higher power capacity compared to standard 40VA units, ensuring sufficient current for complex relay logic, multi-stage boards, and smart thermostats that demand consistent amperage.

Built with high-grade laminations and precision-wound coils, the TRR1104 is designed for the high-temperature environments in furnace cabinets. The footprint is optimized for standard chassis mounting, and the Trane furnace transformer features wire leads or spade terminals depending on the production revision, allowing for clean integration into existing HVAC 24 volt transformer wiring harnesses. Selecting this 75VA control transformer ensures that your diagnostics remain accurate and your control boards are protected from the voltage fluctuations common with generic aftermarket components.

Key Benefits

• Verified Compatibility: Direct OEM match for Trane and American Standard furnaces, replacing legacy part numbers like 21B800536P01.
• Professional Power Rating: The 75VA power rating handles higher loads from modern digital accessories without overheating or voltage drop.
• Stability: Precisely engineered to step down 200/230V to 24V, protecting sensitive PCB controllers and gas valves.
• Rugged Construction: Designed for 60Hz operation with durable insulation that resists vibration-induced fatigue.

Common Questions

Can I use a 75VA transformer to replace a 40VA model?
Yes, in a 24V secondary circuit, you can always go up in VA rating (capacity) but never down. The Trane TRR1104 will provide more available power for additional accessories like zone dampers or humidifiers that might have overloaded a smaller unit.

Is the TRR1104 the same as the TRR01104?
Technically, yes. The manufacturer updated the part number to the TRR01104 format, but the technical specifications—including primary/secondary voltages and the 75VA rating—remain identical for the Trane HVAC replacement part.

How do I verify the primary voltage for this unit?
The TRR1104 is built for 200/230V incoming power. If your system runs on a 120V primary source, this transformer is not the correct fit. Always check the wiring diagram on the service panel to confirm line voltage before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.