ICP 40VA Transformer for WJA424000KTP0A1 – 208/230V to 24V | Ships Today

Overview

This is a genuine OEM control transformer kit (OEM part numbers 1173691 transformer and 1176032 terminal barrier) for the ICP WJA424000KTP0A1 system. The transformer steps the 208/230V line voltage down to the 24V control voltage that powers the thermostat, contactor coil, relays, and control board. Rated at 40VA, it supplies the low-voltage circuit for the entire system. The included 24V barrier protects and isolates the secondary terminals. When the transformer fails, the 24V circuit goes dead — the thermostat blanks, the contactor won't pull in, and the system won't respond to a call. Specs: 40VA, 208/230V primary, 24V secondary, with terminal barrier.

Specifications

Compatibility

Direct-fit replacement for the ICP/Tempstar/Heil WJA424000KTP0A1 system and other ICP-family units that specify the 40VA 208/230-to-24V transformer 1173691 with barrier 1176032. Confirm the VA rating and primary voltage tap against your existing transformer before ordering.

Installation Guide

1. Safety First – Disconnect power at the breaker and verify zero voltage with a multimeter before opening the control box.
2. Access – Remove the service panel to expose the transformer and low-voltage terminals.
3. Document – Photograph the primary tap wiring and all secondary connections before disconnecting.
4. Remove – Disconnect the primary and secondary leads, then unmount the old transformer and barrier.
5. Install – Mount the new transformer, install the 24V barrier, and reconnect the correct primary tap (208 or 230V) and the 24V secondary per your photo.
6. Test – Restore power and confirm 24V across the secondary, then verify the thermostat and contactor respond.

Signs You Need a Replacement

• Thermostat is blank or unpowered with line voltage present.
• No 24V reading across the transformer secondary.
• Contactor and relays won't energize on a call.
• Burnt smell, discoloration, or an open primary/secondary winding.

Shipping & Returns

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