Tempstar 40VA Transformer for TEB09K50RTA — 208/240V to 24V Control Kit | Ships Today
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Overview
This OEM control-power kit for the Tempstar TEB09K50RTA PTAC centers on a 40VA step-down transformer (part 1056899) that converts the unit's 208/240V line voltage down to the 24V used by the control circuit, along with two 24V switching relays — a standard 24V relay (part 1053004) and a 24V DPST relay (part 1060940). The transformer powers the thermostat, relays, and control logic; if it fails open or shorts, the unit goes completely dead on the low-voltage side. The relays handle the actual switching of the fan and compressor loads. Symptoms of failure include a unit with line power but no control response, a tripped or buzzing transformer, or relays that no longer pull in. Replacing these components restores the full 24V control chain.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1056899 (Transformer), 1053004 (Relay), 1060940 (DPST Relay) |
| Type | Step-Down Control Transformer + Relays |
| Brand | Tempstar (ICP / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/240V AC |
| Secondary Voltage | 24V AC |
| Relay Poles | 2 (DPST) / 24V coil |
| Fitment | OEM Replacement |
Compatibility
Engineered for the Tempstar TEB09K50RTA PTAC and shared across ICP, Heil, and Comfortmaker PTAC units using the same 208/240V-to-24V, 40VA control platform. Confirm your primary voltage tap and relay coil voltage before ordering.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and verify zero voltage with a multimeter on both line and control sides.
- Access — Remove the PTAC front cover and control-box panel.
- Document — Photograph every primary and secondary lead and each relay terminal before disconnecting.
- Remove — Label and disconnect the transformer leads and relay wiring, then unbolt the failed components.
- Install — Mount the new 40VA transformer and relays, matching the 208/240V primary tap, and reconnect all leads per your photos.
- Test — Restore power, confirm 24V at the secondary with a meter, then verify the relays pull in and the unit cycles.
Signs You Need a Replacement
- Line power present but the unit is completely unresponsive
- No 24V reading at the transformer secondary
- Transformer is buzzing, hot, scorched, or smells burnt
- Relays fail to click or chatter under load
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