Tempstar 40VA Transformer for TEB15R50RTA — 277V to 24V OEM 1091226 | Ships Today
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Overview
This is the genuine OEM 40VA control transformer (part number 1091226) for the Tempstar TEB15R50RTA, stepping the 277V line voltage down to the 24V needed by the control circuit. The transformer powers the thermostat, relays, and contactors — without it the low-voltage controls are dead and the unit will not respond to any call for cooling or heat. This listing also covers the unit's 24V control relays, 1053004 (24V relay) and 1060940 (24V DPST relay), which switch the compressor and accessory loads. A transformer typically fails from overload or age, showing up as no 24V output, a tripped internal fuse link, or a burnt smell at the control box. These are exact factory replacements with matching mounting and lead configuration.
Specifications
| Spec | Value |
|---|---|
| Transformer Part Number | 1091226 |
| Type | Step-Down Control Transformer |
| Brand | Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 277V |
| Secondary Voltage | 24V |
| Included Relays | 1053004 (24V), 1060940 (24V DPST) |
| Fits Model | TEB15R50RTA |
| Fitment | OEM Direct Replacement |
Compatibility
Built specifically for the Tempstar/Heil TEB15R50RTA. Part 1091226 is the exact 40VA, 277-to-24V transformer the unit shipped with, and relays 1053004 and 1060940 are the matching 24V control relays, so the assembly drops in without rewiring or recalibration.
Installation Guide
- Safety First — Disconnect 277V power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the service panel to expose the control box, transformer, and relays.
- Document — Photograph every primary and secondary lead and relay terminal before disconnecting anything.
- Remove — Disconnect the transformer leads, unbolt it from the control panel, and unclip the failed relay if replacing it.
- Install — Mount the new 1091226 transformer, land the 277V primary and 24V secondary leads per your photos, and seat the 1053004 / 1060940 relays.
- Test — Restore power, confirm 24V at the secondary with a multimeter, and verify the relays pull in on a control call.
Signs You Need a Replacement
- No 24V at the transformer secondary
- Control circuit completely dead — unit ignores all calls
- Burnt smell or discoloration at the transformer or control box
- Repeatedly blown control fuse or chattering relays
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