ICP 40VA Transformer for WPG3422090RKB1 — 208/230V to 24V with Barrier | Ships Today

Overview

This is a genuine OEM control transformer kit for the ICP/Tempstar/Heil WPG3422090RKB1 packaged gas/electric unit, including the 40VA step-down transformer (PN 1173691) and its 24V barrier (PN 1176032). The transformer steps the 208/230V line voltage down to the 24V control voltage that powers the thermostat, contactor coil, gas valve, and control board. The barrier provides terminal protection and isolation for the low-voltage connections. If the transformer fails, the entire low-voltage control system goes dead. Common failure symptoms include a completely unresponsive thermostat, no 24V at the control board, a unit that won't start in any mode, or a transformer that is hot, buzzing, or has a blown internal fuse/winding.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WPG3422090RKB1 packaged gas/electric unit and compatible ICP-family systems using a 40VA 208/230V-to-24V transformer. Confirm your existing transformer's primary voltage taps and VA rating before installing.

Installation Guide

1. Safety First — Disconnect power at the unit and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the electrical service panel.
3. Document — Photograph the primary and secondary wiring and barrier placement before removal.
4. Remove — Disconnect the line and 24V leads, then unbolt the old transformer and barrier.
5. Install — Mount the new transformer and barrier, matching the correct primary voltage tap, and reconnect per your photo.
6. Test — Restore power and confirm 24V across the secondary and normal system operation.

Signs You Need a Replacement

• Thermostat is blank/unresponsive with line power present
• No 24V measured at the control board secondary
• Transformer is hot, buzzing, or smells burnt
• Unit won't run in heating or cooling

Shipping & Returns

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