Tempstar 40VA Transformer for TEB09R50RTA — 277V to 24V with 24V Relays | Ships Today

Overview

This OEM control kit for the Tempstar TEB09R50RTA centers on the 40VA control transformer (OEM part 1091226), which steps 277V line power down to the 24V used by the unit's control circuit. The kit also includes the 24V control relay (OEM part 1053004) and the 24V DPST relay (OEM part 1060940). The transformer powers the thermostat, relays, and control circuit; when it fails, the entire low-voltage system goes dead — no fan, no compressor, no response from the controls. A blown transformer is often caused by a shorted control wire or a stuck relay, so inspect the circuit before installing the replacement.

Specifications

Compatibility

A direct-fit replacement for the Tempstar TEB09R50RTA unit. This 277V-to-24V 40VA transformer and the matching 24V relays are used across ICP-family TEB-series equipment built by ICP/Heil. Verify your model and OEM part numbers before ordering.

Installation Guide

1. Safety First — Disconnect power at the unit and breaker, verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the control box.
3. Document — Photograph all primary and secondary wiring before disconnecting.
4. Remove — Unbolt the failed transformer/relays and disconnect leads, noting each terminal.
5. Install — Mount the new transformer and relays, wiring 277V to the primary and 24V to the secondary per your photo.
6. Test — Restore power and confirm 24V at the secondary and proper relay operation.

Signs You Need a Replacement

• No 24V at the control circuit (dead low-voltage system)
• Unit completely unresponsive while line power is present
• Burnt smell or visibly scorched transformer
• Repeatedly blown control fuse or tripped relay

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.