ICP Transformer for WAHL484B2 — 40VA 208/230V to 24V | Ships Today

Overview

This OEM control transformer (part number 1172028) supplies 24V power to the low-voltage control circuit of your ICP/Tempstar/Heil model WAHL484B2 system. It steps a 208/230V primary down to a 24V, 40VA secondary that drives the thermostat, contactor, relays, and control board. A failed transformer kills the entire control system: the thermostat goes blank, the contactor stays open, and the unit refuses to start. Typical failure causes are a shorted secondary, an overloaded control circuit, or simple age.

Specifications

Compatibility

Direct-fit replacement for ICP, Tempstar, Heil, Comfortmaker, and related International Comfort Products equipment using model WAHL484B2. The 40VA 208/230V-to-24V rating is shared across many ICP air handlers and furnaces — verify the VA and voltage of your existing transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the service panel to expose the control compartment.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt the failed transformer from its bracket.
5. Install — Mount the new transformer, match the primary taps to your supply voltage, and reconnect the secondary leads per your photo.
6. Test — Restore power and confirm 24V across the secondary terminals and normal startup.

Signs You Need a Replacement

• Thermostat is dark with no 24V control power.
• Contactor and relays will not pull in on a call for heat or cool.
• Repeatedly blown control fuse or a burnt smell near the transformer.
• Zero voltage measured across the 24V secondary.

Shipping & Returns

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