ICP 40VA Transformer for WAPM424A1 — 208/230V to 24V Primary | Ships Today
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Overview
This OEM 40VA control transformer (part number 1172028) is the power supply backbone of your ICP WAPM424A1 air handler. It steps down line voltage of 208/230V to the 24V control voltage required by the thermostat, blower control board, contactor coil, and other low-voltage components. Rated at 40VA, it delivers the current needed to drive the control circuit without overheating. When a transformer fails, the entire low-voltage control system goes dead — the thermostat screen may go blank, the blower won't energize, and no heating or cooling call will be answered. Common failure causes include shorted secondary wiring, a seized contactor coil drawing excessive current, or simple age-related winding breakdown.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172028 |
| Type | Step-Down Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/230 VAC |
| Secondary Voltage | 24 VAC |
| Fitment | OEM |
Compatibility
Engineered as a direct OEM replacement for the ICP WAPM424A1 air handler. ICP manufactures equipment under the Tempstar, Heil, Comfortmaker, and Arcoaire labels, so this transformer also fits equivalent models across those brand families that specify part 1172028.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage at the unit with a multimeter before touching any wiring.
- Access — Remove the service panel to expose the control compartment.
- Document — Photograph all primary and secondary wire connections before disconnecting anything.
- Remove — Unscrew the transformer mounting bracket, then disconnect the primary (line) and secondary (24V) leads.
- Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo, and confirm the primary tap matches your supply voltage.
- Test — Restore power and verify 24V across the secondary terminals and that the control system energizes.
Signs You Need a Replacement
- Blank thermostat or no display power
- No response to heating or cooling calls
- Blower and contactor fail to energize
- Burnt smell or visible scorching on the 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