Tempstar 40VA Transformer for TCH660GKA200 — 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer (Tempstar part number 1170676) steps down 208/230V line voltage to the 24V control voltage that powers the contactor coil, relays, and thermostat circuit on your Tempstar TCH660GKA200 system. Rated at 40VA, it supplies the low-voltage backbone of the unit. When a transformer fails — from a shorted secondary, a stuck contactor coil, or age — the entire 24V control circuit goes dead and the system will not respond to a cooling call. A blown transformer is a frequent cause of a completely unresponsive unit.

Specifications

Compatibility

Built for the Tempstar TCH660GKA200 and shared across Heil, ICP, and Comfortmaker equipment using a 208/230V-to-24V 40VA control transformer. Confirm primary voltage, secondary voltage, and VA rating match your original before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the control compartment.
3. Document — Photograph the primary (line) and secondary (24V) wiring before disconnecting.
4. Remove — Detach the leads and unbolt the old transformer from its bracket.
5. Install — Mount the new transformer and reconnect primary and secondary leads per your photo.
6. Test — Restore power and confirm 24V at the secondary and normal system operation.

Signs You Need a Replacement

• No 24V control voltage and a completely unresponsive unit.
• Burning smell or visibly scorched transformer housing.
• Repeated blown low-voltage fuses.
• Contactor and controls won't energize on a cooling call.

Shipping & Returns

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