Tempstar 40VA Transformer for TEB07R34RTA — 277V to 24V PTAC Control | Ships Today
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Overview
This OEM 40VA control transformer steps 277V line power down to the 24V signal required by the low-voltage control circuit on your Tempstar TEB07R34RTA PTAC unit. The transformer powers thermostats, relays, and contactor coils throughout the system. When it fails, the entire 24V control side goes dead — the blower won't energize, the compressor contactor won't pull in, and the thermostat display may go blank even though 277V line power is present. A buzzing, scorched, or open-winding transformer is one of the most common no-response failures on packaged PTAC equipment. This assembly is supplied with the matching OEM 24V relays (1053004 SPST and 1060940 DPST) that share the control circuit.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1091226 (transformer), 1053004 / 1060940 (relays) |
| Type | Step-Down Control Transformer |
| Brand | Tempstar |
| Primary Voltage | 277V |
| Secondary Voltage | 24V |
| Rating | 40VA |
Compatibility
Engineered as a direct OEM fit for the Tempstar TEB07R34RTA PTAC and equivalent Heil/ICP-built packaged terminal units sharing the 277V control architecture. Confirm your unit's primary voltage and VA rating against the data plate before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter on both the 277V and 24V terminals.
- Access — Remove the front service panel to expose the control box.
- Document — Photograph all primary and secondary wire connections before disconnecting.
- Remove — Disconnect the line and load leads, unbolt the transformer from the bracket, and lift it out.
- Install — Mount the new transformer, reconnect primary (277V) and secondary (24V) leads exactly per your photo.
- Test — Restore power and verify 24V across the secondary and proper control-circuit operation.
Signs You Need a Replacement
- No 24V output measured at the secondary terminals
- Blower, contactor, or thermostat completely unresponsive with line power present
- Visible scorching, melted potting, or a burnt smell at the transformer
- Audible buzzing or repeated control-fuse blowing
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days