ICP 40VA Transformer for WPG4484130RKA1 — 208/230V to 24V | Ships Today
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Overview
This is a genuine OEM 40VA control transformer (part number 1173691) with its mating 24V barrier/cover (part number 1178431) for the ICP / Heil / Tempstar WPG4484130RKA1 packaged gas unit. The transformer steps the 208/230V line voltage down to the 24V control voltage that powers the thermostat, control board, contactor coil, gas valve, and safety circuits. A 40VA rating provides the current needed to pull in the contactor and energize the gas valve at the same time. When the transformer fails, the entire low-voltage control system goes dead — even though high-voltage components still have power. Symptoms include a blank thermostat, no response to a heat or cool call, or a transformer that hums, overheats, or has a blown internal fuse link.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1173691 (transformer), 1178431 (24V barrier) |
| Type | Step-down control transformer |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Rating | 40 VA |
| Primary Voltage | 208 / 230V |
| Secondary Voltage | 24V |
Compatibility
Direct OEM replacement for the ICP / Heil / Tempstar WPG4484130RKA1 packaged gas system. The same 40VA step-down transformer is shared across many ICP-family Heil, Tempstar, Comfortmaker, and Arcoaire units. Confirm your primary tap matches your incoming line voltage (208V vs 230V) before wiring.
Installation Guide
- Safety First — Disconnect power at the unit and verify zero voltage with a multimeter before touching wiring.
- Access — Remove the service panel to reach the control box.
- Document — Photograph all primary and secondary leads before disconnecting.
- Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer from the panel.
- Install — Mount the new transformer, install the barrier cover, and reconnect the primary tap matching your line voltage and the 24V secondary per your photo.
- Test — Restore power, confirm 24V at the secondary, and verify the thermostat and controls respond.
Signs You Need a Replacement
- Blank thermostat with confirmed high voltage to the unit.
- No 24V output measured at the secondary terminals.
- Transformer hums loudly, overheats, or smells burnt.
- Repeated control fuse blowing traced to a shorted winding.
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