Tempstar 40VA Transformer for TCH936GKA200 — 208/230V to 24V | Ships Today

Overview

The Tempstar OEM control transformer (part #1170676) is a 40VA step-down transformer with a 208/230-volt primary and a 24-volt secondary, used to power the low-voltage control circuit of the TCH936GKA200 unit. It converts incoming line voltage to the 24VAC that drives the contactor coil, thermostat, and safety controls. A failed transformer leaves the entire control circuit dead — the contactor won't pull in, the thermostat goes blank or unresponsive, and the system won't start. Common causes of failure include a shorted control circuit, a seized contactor coil drawing excess current, or a power surge that opens the windings.

Specifications

Compatibility

This transformer is the factory-specified replacement for the Tempstar TCH936GKA200 and fits compatible ICP, Heil, and Comfortmaker units that use a 40VA 208/230-to-24V control transformer. Confirm the VA rating and primary/secondary voltages match your original before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter.
2. Access — Remove the electrical access panel to reach the transformer.
3. Document — Photograph the primary and secondary lead connections before disconnecting.
4. Remove — Disconnect the leads, then unbolt the old transformer from the panel.
5. Install — Mount the new transformer and reconnect the primary to line voltage and the secondary to the 24V circuit per your photo.
6. Test — Restore power and verify 24VAC at the secondary and that the contactor energizes on a call.

Signs You Need a Replacement

• No 24V output — thermostat is blank and nothing energizes
• Contactor won't pull in despite a cooling call
• Burned smell or visible scorching on the transformer body
• Zero or out-of-spec voltage reading across the secondary terminals

Shipping & Returns

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