ICP 40VA Transformer for WJA330000K000B1 — 208/230V to 24V Class 2 | Ships Today

Overview

This OEM kit supplies the genuine ICP/Heil/Tempstar 40VA control transformer (part 1173691) and its matching 24V terminal barrier (part 1176032) for the WJA330000K000B1 unit. The transformer steps the 208/230V line-voltage primary down to a 24V Class 2 secondary that powers the contactor coil, control board, and thermostat circuit. The terminal barrier insulates and protects the low-voltage connections from accidental shorts to the cabinet. A failed transformer is one of the most common causes of a completely dead control system — no thermostat response, no contactor pull-in, and no call for cooling — even when the high-voltage side is healthy. If you measure line voltage at the primary but no 24V on the secondary, the transformer has failed open.

Specifications

Compatibility

Built for the ICP/Heil/Tempstar WJA330000K000B1 and shared-platform units using the same 24V control circuit. Confirm part numbers 1173691 and 1176032 against your wiring diagram before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the control box.
3. Document — Photograph the primary and secondary wiring before disconnecting.
4. Remove — Label and disconnect the leads, unbolt the old transformer, and remove the old barrier.
5. Install — Mount the new transformer, install the 24V barrier, and reconnect primary and secondary leads per your photo.
6. Test — Restore power and confirm 24V across the secondary and proper contactor pull-in on a call for cooling.

Signs You Need a Replacement

• No 24V at the control board or thermostat
• System completely unresponsive with healthy line voltage
• Burnt smell or visibly scorched transformer windings
• Repeated blown low-voltage fuses

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.