ICP 40VA Transformer for WPG4364090RKA1 — 208/230V to 24V | Ships Today

Overview

This genuine OEM 40VA control transformer (part number 1173691) steps the line-voltage supply down from 208/230V to the 24V control voltage that powers the thermostat, control board, contactor coil, and gas valve on the ICP/Tempstar/Heil WPG4364090RKA1 packaged unit. The listing includes the matching 24V barrier (part 1178431) used to protect and isolate the low-voltage terminals. A 40VA rating provides enough sealed VA to drive the full 24V load of the unit. When a transformer fails — typically from a shorted thermostat wire, a stuck contactor coil, or simple age — the entire system goes dead with no 24V present at the board.

Specifications

Compatibility

Factory-exact replacement for the ICP WPG4364090RKA1 packaged gas/electric unit and related Tempstar, Heil, and Comfortmaker WPG-series equipment that shipped with transformer 1173691 and barrier 1178431. Confirm your primary tap matches your incoming line voltage before wiring.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter.
2. Access — Remove the control/electrical service panel.
3. Document — Photograph all primary and secondary leads before disconnecting.
4. Remove — Disconnect the leads, unbolt the old transformer, and remove the barrier if reusing the bracket.
5. Install — Mount the new transformer, land the primary on the correct voltage tap, reconnect the 24V secondary, and install the barrier.
6. Test — Restore power and confirm 24V across the secondary and proper system startup.

Signs You Need a Replacement

• No 24V control power — thermostat and board completely dead.
• Blown low-voltage fuse on the control board.
• Transformer hums loudly, runs hot, or smells burnt.
• Secondary reads 0V while primary line voltage is present.

Shipping & Returns

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