ICP Transformer for WJA330000K000A2 — 40VA 208/230V to 24V | Ships Today
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Overview
This OEM control transformer steps 208/230V line voltage down to the 24V needed to power the low-voltage control circuit on your ICP / Heil / Tempstar WJA330000K000A2 system. Rated at 40VA, it supplies stable power to the thermostat, contactor coil, control board, and safety switches. When a transformer fails — usually from a shorted secondary, age, or a surge — the entire low-voltage system goes dead: no thermostat display, no call for cooling or heating, and no contactor pull-in. This kit includes the matching 24V barrier (P/N 1176032) used to isolate the secondary terminals. Replacing the transformer with the correct OEM part restores reliable 24V control and protects downstream components from over/under-voltage.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 (transformer), 1176032 (24V barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP / Heil / Tempstar |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fit | OEM Replacement |
Compatibility
Engineered for the ICP / Heil / Tempstar / Comfortmaker WJA330000K000A2 model and other units in the same family that use a 40VA 208/230V-to-24V control transformer. Always confirm the primary voltage and VA rating against the unit you are servicing before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
- Access — Remove the control-panel service cover to expose the transformer.
- Document — Photograph all primary and secondary wire connections before disconnecting.
- Remove — Label and disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the transformer from the mounting bracket.
- Install — Mount the new transformer, install the 24V barrier, and reconnect every lead 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 thermostat and a blank display.
- Contactor or control board will not energize on a call.
- Repeatedly blown low-voltage fuse or a burnt/melted transformer.
- Measured secondary voltage well below 24V under load.
Shipping & Returns
Ships same day on orders placed 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