ICP Transformer for WPG4484130RKB1 — 208/230V to 24V 40VA | Ships Today
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Overview
This OEM ICP transformer (part 1173691) steps down the incoming 208/230V line voltage to the 24V control voltage required to operate contactors, relays, the control board, and the thermostat circuit on your WPG4484130RKB1 unit. Rated at 40VA, it supplies steady low-voltage power to the entire control loop. The kit also includes the 24V barrier (part 1178431) that isolates and protects the secondary wiring connections. When a transformer fails, the system loses all 24V control power: the blower and condenser will not energize, the thermostat goes blank, and the contactor never pulls in. A buzzing transformer, a tripped low-voltage fuse, or a burnt smell at the control box are classic signs the transformer has shorted or overheated.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP / Heil / Tempstar |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Rating | 40 VA |
Compatibility
Engineered as a direct OEM replacement for the ICP/Heil/Tempstar WPG4484130RKB1 packaged unit. The same 208/230V-to-24V 40VA transformer is shared across many ICP-family condensers, heat pumps, and package units — verify the primary/secondary voltage and VA rating against the transformer currently installed before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage at the transformer leads with a multimeter.
- Access — Remove the control-box service panel to expose the transformer and low-voltage terminals.
- Document — Photograph all primary and secondary wire connections before disconnecting anything.
- Remove — Label and disconnect the primary (line) and secondary (24V) leads, then unbolt the failed transformer from its bracket.
- Install — Mount the new transformer and barrier, then reconnect primary and secondary wiring exactly per your photo.
- Test — Restore power and confirm 24V across the secondary terminals and proper control operation.
Signs You Need a Replacement
- No 24V at the control board or thermostat (blank display)
- Repeatedly blown low-voltage fuse
- Audible buzzing or humming from the transformer
- Scorched, melted, or burnt-smelling transformer windings
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