ICP Transformer for WPG3484090RKC1 — 40VA 208/230V to 24V | Ships Today
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Overview
This genuine OEM control transformer (part #1173691) steps the unit's 208/230V line voltage down to the 24V control voltage that powers the thermostat, control board, gas valve, contactor coil, and pressure switch in the ICP/Tempstar/Heil WPG3484090RKC1 packaged unit. Rated at 40VA, it supplies the low-voltage circuit that runs the entire control system. When a transformer fails — usually from a shorted low-voltage wire, a stuck contactor drawing excess current, age, or a power surge — the result is a completely dead control circuit: no thermostat display, no response to heat or cool calls, and no 24V present at the board. This listing includes the matching 24V terminal barrier (part #1178431) used with the transformer assembly.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fit | OEM Direct Replacement |
Compatibility
Direct OEM fit for the ICP/Tempstar/Heil WPG3484090RKC1 packaged system. The 40VA, 208/230V-to-24V rating is shared across many ICP-family units, making this a common service replacement. Confirm primary voltage taps and VA rating match the transformer you are removing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the electrical access panel to reach the transformer.
- Document — Photograph the primary and secondary wiring, including which line-voltage tap is used.
- Remove — Disconnect the primary and 24V secondary leads, then unbolt the transformer and barrier from the panel.
- Install — Mount the new transformer and barrier, connect the correct primary tap (208 or 230V), and wire the 24V secondary per your photo.
- Test — Restore power and confirm 24V at the secondary and normal thermostat/control operation.
Signs You Need a Replacement
- Blank thermostat — no power to the control circuit
- No 24V measured at the secondary terminals
- System won't respond to any heat or cool call
- Burnt smell or visibly scorched transformer housing
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