ICP Transformer for WPG3424090RKC1 — 40VA 208/230V to 24V | Ships Today
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Overview
This is the genuine OEM control transformer assembly for the ICP / Tempstar / Heil WPG3424090RKC1 packaged unit. The transformer (OEM part 1173691) steps the incoming 208/230V line voltage down to the 24V control voltage that powers the thermostat, contactor coil, control board, and safety circuits. It is rated at 40VA, providing ample capacity for the unit's low-voltage loads. The kit also includes the 24V barrier (OEM part 1178431) that isolates and protects the low-voltage terminals. When a control transformer fails, the entire 24V control circuit goes dead — the thermostat screen may go blank, the contactor will not pull in, and neither heating nor cooling will start. A buzzing, overheated, or visibly burnt transformer is a clear sign of failure.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 (transformer), 1178431 (24V barrier) |
| Type | Control / Class 2 Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208 / 230 V |
| Secondary Voltage | 24 V |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as the factory-correct control transformer for the ICP / Tempstar / Heil model WPG3424090RKC1 packaged gas/electric unit. The 208/230V-to-24V 40VA rating is shared across many ICP-family condensing units and packaged systems — always confirm your unit's primary voltage and VA rating against the failed part before installing.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and main breaker. Verify zero voltage at the line terminals with a multimeter before touching any wiring.
- Access — Remove the control-panel service panel to expose the transformer and low-voltage terminal board.
- Document — Photograph every primary and secondary lead and its terminal before disconnecting anything.
- Remove — Disconnect the primary and secondary leads, then unbolt the transformer from its mounting bracket. Remove the old 24V barrier.
- Install — Mount the new transformer, install the new 24V barrier, and reconnect the primary (208/230V) and secondary (24V) leads exactly per your photo.
- Test — Restore power and confirm 24V across the secondary; verify the thermostat powers up and the unit starts on a call.
Signs You Need a Replacement
- Blank thermostat / no 24V control power
- Contactor will not pull in; unit won't start on a call
- Transformer is buzzing, hot to the touch, or visibly burnt
- Repeatedly blown low-voltage fuse or no measurable 24V output
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