ICP Transformer for WPG4424090RKB1 — 40VA 208/230V to 24V | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
The OEM 1173691 control transformer steps the 208/230V line supply down to the 24V control voltage that powers the thermostat, relays, gas valve, and contactor coil on ICP, Heil, and Tempstar units. Rated at 40VA, it provides the steady low-voltage power your control circuit needs to operate every safety and switching device. This listing includes the matching 1178431 24V barrier/insulator that isolates the transformer terminals. When a transformer fails — usually from a shorted control wire, a stuck contactor coil, or age — you lose all 24V control power, so the system goes completely dead even though line voltage is present. Replacing it restores reliable control power and prevents repeat burnouts when paired with the correct barrier.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1173691 (transformer), 1178431 (24V barrier) |
| Type | Control Transformer |
| Brand | ICP / Heil / Tempstar |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Application | Furnace / Package Unit control circuit |
Compatibility
Direct OEM replacement for the ICP/Heil/Tempstar WPG4424090RKB1 package unit and related ICP-family equipment using a 40VA, 208/230V-to-24V control transformer. Confirm VA rating and primary/secondary voltages against the label on your existing transformer before installing.
Installation Guide
- Safety First — Disconnect power at the unit and breaker, and verify zero voltage with a multimeter.
- Access — Remove the control/electrical access panel.
- Document — Photograph and label every primary and secondary wire before disconnecting.
- Remove — Disconnect the leads, unbolt the old transformer, and inspect the 24V circuit for any short that caused the failure.
- Install — Mount the new transformer with the included barrier, then reconnect line and 24V leads per your photo.
- Test — Restore power, confirm 24V across the secondary, and verify the system energizes on a call.
Signs You Need a Replacement
- System completely dead with line voltage present
- No 24V at the control board or thermostat
- Blown low-voltage fuse or repeated control failures
- Burnt smell or visibly scorched 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