ICP 40VA Transformer for WPG3604090RKC1 — 208/230 to 24V Kit | Ships Today
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Overview
This genuine OEM transformer kit for the ICP / Tempstar / Heil WPG3604090RKC1 packaged unit includes the 40VA step-down transformer (part 1173691) and its 24V terminal barrier (part 1178431). The transformer converts the 208/230V line supply down to the 24V control voltage that powers the thermostat, control board, gas valve, contactor coil, and pressure switch circuit. At 40VA it provides ample low-voltage capacity for the unit's full control load. The transformer is the heart of the control circuit — when it fails, the entire low-voltage side goes dead: no thermostat display, no relay pull-in, and neither heating nor cooling will operate. The included barrier keeps the 24V terminal connections organized and properly isolated.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Rating | 40 VA |
| Primary Voltage | 208 / 230V |
| Secondary Voltage | 24V |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil WPG3604090RKC1 packaged gas-electric unit and compatible ICP-family equipment using the 40VA 208/230-to-24V transformer 1173691 with barrier 1178431. Confirm the primary voltage tap and VA rating before ordering.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the electrical/control access panel.
- Document — Photograph the primary (line) and secondary (24V) wiring and the barrier layout before removal.
- Remove — Label and disconnect the primary and secondary leads, then unmount the old transformer and barrier.
- Install — Mount the new transformer and barrier, wire the correct primary tap (208 or 230V), and connect the 24V secondary per your photo.
- Test — Restore power and confirm 24V across the secondary, then verify heating and cooling calls operate.
Signs You Need a Replacement
- No 24V control voltage — thermostat is blank and nothing energizes.
- Transformer is hot, buzzing, or has a burnt smell.
- Repeated blown low-voltage fuses or a shorted secondary.
- Open primary or secondary winding when measured with a meter.
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