ICP Transformer for WPG4304040LKA1 — 40VA 208/230V to 24V | Ships Today
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Overview
This OEM control transformer (part #1173691) steps down 208/230V line voltage to the 24V low-voltage signal that powers the thermostat, contactor coil, gas valve, and control board on your ICP WPG4304040LKA1 packaged unit. Rated at 40VA, it supplies the steady, regulated current the 24V control circuit needs to cycle the system reliably. When a transformer fails, the entire control circuit goes dead — the thermostat screen may go blank, the contactor won't pull in, and the unit simply won't start. A buzzing transformer, a tripped low-voltage fuse, or zero reading at the 24V secondary terminals all point to a failing or overloaded transformer. Includes the matching 24V barrier (part #1178431).
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
Compatibility
Engineered for the ICP WPG4304040LKA1 packaged gas/electric unit and shared across many ICP-family models built under the Tempstar, Heil, Comfortmaker, and Arcoaire brands using the same 208/230V-to-24V control platform. Always confirm the part number on your existing transformer before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect switch, then verify zero voltage with a multimeter.
- Access — Remove the control-panel service cover.
- Document — Photograph the primary and secondary wiring before disconnecting anything.
- Remove — Label and disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the old transformer from its mounting bracket.
- Install — Mount the new transformer, match the 208/230V primary tap to your supply voltage, and reconnect the secondary leads per your photo.
- Test — Restore power and confirm 24V across the secondary terminals, then verify the unit cycles on a thermostat call.
Signs You Need a Replacement
- Thermostat is blank and the system is completely unresponsive
- Repeatedly blown low-voltage (3–5A) control fuse
- Audible buzzing or burnt smell from the transformer
- No 24V reading at the secondary terminals with line power present
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