Tempstar Transformer for TCA936GKA100 — 40VA 208/230V to 24V | Ships Today

Overview

This genuine OEM control transformer (part number 1170676) powers the 24-volt control circuit on the Tempstar TCA936GKA100. It steps incoming 208/230V line voltage down to 24V at 40VA, supplying the contactor coil, pressure switches, and any connected thermostat/control demand. When a transformer fails — usually from a shorted secondary, age, or a power surge — the entire low-voltage circuit goes dead: the contactor won't pull in, the compressor and condenser fan stay off, and the thermostat may lose power. A blown transformer is also a symptom of a downstream short, so inspect the 24V wiring before replacing.

Specifications

Compatibility

Direct OEM fit for the Tempstar TCA936GKA100 condensing unit and shared ICP/Heil/Comfortmaker condensers using the same 40VA control platform. Verify the 208/230V-to-24V rating and part number 1170676 against the original before wiring in.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect, then confirm zero voltage with a multimeter.
2. Access — Remove the control/service panel to reach the transformer mounting bracket.
3. Document — Photograph every primary and secondary lead and color before disconnecting.
4. Remove — Disconnect the leads, unscrew the transformer from its bracket, and lift it out.
5. Install — Mount the new transformer, match the 208/230V primary tap to your supply voltage, and reconnect 24V secondary leads per your photo.
6. Test — Restore power and confirm 24V across the secondary and that the contactor energizes.

Signs You Need a Replacement

• No 24V output at the secondary terminals
• Contactor will not pull in and the compressor stays off
• Thermostat is dark or unresponsive with line voltage present
• Transformer is buzzing loudly, scorched, or smells burnt

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee.