ICP 40VA Transformer for WPG3422090LKB1 — 208/230V to 24V Control | Ships Today

Overview

This is a genuine OEM control transformer kit (part number 1173691, supplied with terminal barrier 1176032) for the ICP / Tempstar / Heil WPG3422090LKB1 package unit. The transformer steps the unit's 208/230-volt line power down to the 24-volt low-voltage power that runs the thermostat, control board, contactor coil, gas valve, and the rest of the control circuit. It is rated at 40 VA, which defines how much low-voltage load it can safely carry. The included 24V barrier (1176032) provides the insulated terminal separation that keeps the low-voltage connections organized and protected. A transformer fails when its windings open from age or heat, or when it burns out after a short on the 24V side. Typical symptoms include a completely dead thermostat, no response from the system on any call, or repeated transformer burnout caused by a downstream short. Because so many components depend on the 24V supply, a bad transformer takes the entire system offline.

Specifications

Compatibility

This 40VA transformer is the factory-specified control-power source for the ICP WPG3422090LKB1 package unit and related Tempstar, Heil, and Comfortmaker units built on International Comfort Products platforms. Verify the 208/230V primary tap matches your supply and confirm part number 1173691 before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter across the primary leads.
2. Access — Remove the control/electrical panel to expose the transformer.
3. Document — Photograph the primary and secondary wiring and the barrier placement before disconnecting.
4. Remove — Label and disconnect the primary (line) and secondary (24V) leads, then unscrew the old transformer from its mounting.
5. Install — Mount the new transformer, install the 24V barrier, and reconnect the primary to the correct 208/230V tap and the secondary to the 24V circuit per your photo.
6. Test — Restore power and verify 24V across the secondary terminals, then confirm the thermostat and controls power up normally.

Signs You Need a Replacement

• Thermostat screen is blank and the system is completely unresponsive.
• No 24V reading across the transformer secondary with line power present.
• Burned smell, discoloration, or melted housing on the transformer.
• Repeated control-circuit failures or a transformer that burns out shortly after replacement.

Shipping & Returns

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