ICP 40VA Transformer for WPG4484090RKA1 — 208/230V to 24V | Ships Today
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Overview
This genuine OEM control transformer (part #1173691) with terminal barrier (part #1178431) supplies low-voltage control power for the ICP/Tempstar/Heil WPG4484090RKA1 packaged unit. It steps the 208/230V line-voltage primary down to a 24V secondary rated at 40VA, powering the control board, contactor coil, gas valve, and thermostat circuit. When a transformer fails — usually from a control-circuit short, a shorted gas valve, or simple age — the entire 24V system goes dead: no thermostat display, no contactor pull-in, and no ignition. A transformer that buzzes loudly, runs hot, or has a blown internal winding must be replaced to restore control power. Always correct the short that caused the failure before installing a new transformer.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1173691, 1178431 |
| Type | Step-Down Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Primary Voltage | 208/230 VAC |
| Secondary Voltage | 24 VAC |
| Rating | 40 VA |
| Fits Model | WPG4484090RKA1 |
Compatibility
Factory replacement for the ICP, Tempstar, Heil, and Comfortmaker WPG4484090RKA1 packaged unit. Confirm the primary tap voltage (208 vs 230), 24V secondary, and 40VA rating against your existing transformer before installing. The included barrier (1178431) protects the secondary terminals.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the control-panel service panel to reach the transformer.
- Document — Photograph the primary and secondary wiring before disconnecting.
- Remove — Disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the old transformer.
- Install — Mount the new transformer, fit the terminal barrier, and connect the correct primary tap and secondary per your photo.
- Test — Restore power and confirm 24V across the secondary and that the thermostat and controls energize.
Signs You Need a Replacement
- No 24V control power — thermostat is blank and nothing responds
- Transformer buzzes loudly or runs too hot to touch
- No reading across the secondary terminals with line voltage present
- Burned smell or visible scorching on the transformer body
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the 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