ICP 40VA Transformer for WPG3604115RKC1 — 208/230V to 24V | Ships Today
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Overview
This genuine ICP control transformer (OEM 1173691) steps line voltage of 208/230V down to the 24V control voltage that powers your thermostat, control board, contactor coil, gas valve, and safety circuit. Rated at 40VA, it supplies enough current to drive the full low-voltage control train of the packaged unit. The kit pairs with the OEM 24V barrier/cover (part 1178431) to keep the secondary connections safely insulated. When a transformer fails — typically from a shorted secondary, a stuck contactor coil, or age — the entire 24V control system goes dead: no thermostat response, no cooling, no heat. This is the exact OEM transformer fitted to the ICP / Tempstar / Heil WPG3604115RKC1.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1173691 (transformer), 1178431 (24V barrier) |
| Type | Step-down control transformer |
| Brand | ICP (Tempstar / Heil) |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Fits Model | WPG3604115RKC1 |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil packaged unit WPG3604115RKC1. Other ICP-family units (Comfortmaker, Arcoaire, KeepRite, Day & Night) use similar 40VA 208/230-to-24V transformers, but confirm primary tap voltage and VA rating against OEM 1173691 before installing.
Installation Guide
- Safety First — Disconnect power at the unit disconnect or breaker and verify zero voltage with a multimeter on both line and load sides.
- Access — Remove the control/electrical compartment service panel.
- Document — Photograph all primary and secondary leads and note which tap is in use before disconnecting.
- Remove — Disconnect the primary and secondary wires, then unbolt the old transformer from its bracket.
- Install — Mount the new transformer, install the 24V barrier, and reconnect the leads to the matching taps per your photo.
- Test — Restore power and confirm 24V across the secondary and normal thermostat/contactor operation.
Signs You Need a Replacement
- No 24V control voltage — thermostat and control board are completely unresponsive.
- Blown low-voltage fuse that re-blows after replacement.
- Burnt smell, melted casing, or discolored transformer windings.
- System will not start in heat or cool despite good line voltage.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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