ICP Transformer for WPG4604090LKA1 — 40VA 208/230 to 24V | Ships Today
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Overview
This OEM control transformer (part number 1173691) with terminal barrier (part number 1178431) steps line voltage down to the 24V control power that runs the thermostat, contactor coil, gas valve, and control board on your ICP WPG4604090LKA1 package unit. Rated at 40VA with a 208/230V primary and 24V secondary, it supplies the low-voltage circuit the entire system depends on. When a transformer fails — usually from a control short, a shorted contactor coil, or age — the thermostat goes dark and nothing responds to a call for heating or cooling. Replacing the transformer restores 24V control power and brings the system back online.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1173691, 1178431 |
| Type | Step-Down Control Transformer |
| Brand | ICP |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
Compatibility
Direct OEM replacement for the control transformer in the ICP / Tempstar / Heil WPG4604090LKA1 package unit, and fits related ICP-family units using a 40VA, 208/230V-to-24V transformer. Verify VA rating, primary tap voltage, and secondary voltage match your original before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
- Access — Remove the service panel to reach the control box.
- Document — Photograph the primary and secondary wiring and tap connections before disconnecting.
- Remove — Label and disconnect the leads, then unbolt the old transformer and barrier from the panel.
- Install — Mount the new transformer and barrier, then reconnect the primary to the correct voltage tap and the secondary to the 24V circuit.
- Test — Restore power, confirm 24V across the secondary, and verify the thermostat and controls respond.
Signs You Need a Replacement
- Thermostat screen is blank and the system is unresponsive.
- No 24V reading across the transformer secondary.
- Burnt smell or visibly charred transformer windings.
- Repeated control fuse blows after a low-voltage short.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days