Tempstar 24V Control Transformer for TEB15R25DCA — 40VA 208/240V | Ships Today
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Overview
This OEM 24V control transformer (Tempstar part #1058148) supplies low-voltage power to the control circuit of your Tempstar TEB15R25DCA PTAC unit. It steps the 208/240V line voltage down to a stable 24V secondary, energizing the thermostat, relays, and control components that run the heating and cooling cycle. Rated at 40VA, it delivers ample current for the contactor coil, switching relay, and control board without nuisance dropout. When a control transformer fails, the entire 24V circuit goes dead — the unit will not respond to the thermostat, the fan and compressor stay off, and you may smell burnt insulation or see a charred secondary winding. A buzzing transformer or one that trips its internal fuse repeatedly is also a sign of failure.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1058148 |
| Type | Control Transformer |
| Brand | Tempstar (ICP / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208 / 240 V |
| Secondary Voltage | 24 V |
| Fit | OEM Replacement |
Compatibility
Engineered as a direct OEM replacement for the Tempstar TEB15R25DCA PTAC and other ICP / Heil / Tempstar TEB15-series packaged terminal units that use a 40VA 208/240V-to-24V control transformer. Always confirm the part number stamped on your existing transformer before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter at both the line and 24V terminals.
- Access — Remove the front cabinet panel to reach the control box.
- Document — Photograph all primary and secondary wire connections before disconnecting.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from its bracket.
- Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo, matching voltage taps.
- Test — Restore power and confirm 24V at the secondary and normal thermostat response.
Signs You Need a Replacement
- No 24V output — unit completely unresponsive to the thermostat
- Audible buzzing or humming from the transformer
- Burnt smell or visible charring on the windings
- Repeatedly blown low-voltage control fuse
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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