ICP 40VA Transformer for WPG3482090RKB1 — 208/230V to 24V Class 2 | Ships Today

Overview

This OEM 40VA control transformer (part 1173691) steps 208/230V line voltage down to the 24V control circuit that powers the contactor coil, gas valve, thermostat, and control board on the ICP / Tempstar / Heil WPG3482090RKB1 packaged unit. This listing includes the matching 24V barrier (part 1176032) used to isolate and protect the low-voltage wiring. When a transformer fails — usually from a shorted control circuit, a stuck contactor, or simple age — the entire 24V system goes dead: no thermostat response, no cooling or heating call, and often a blown low-voltage fuse on the control board. A transformer that hums loudly, runs hot, or shows 0V on its secondary under load needs replacement.

Specifications

Compatibility

Direct-fit OEM replacement for the ICP/Tempstar/Heil WPG3482090RKB1 packaged gas/electric unit. The 40VA 208/230-to-24V transformer is shared across many ICP-family packaged units. Verify part number 1173691 and your primary voltage tap before installing.

Installation Guide

1. Safety First — Disconnect power at the unit disconnect. Verify zero voltage with a multimeter at the line terminals.
2. Access — Remove the control/electrical compartment service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the primary leads (matching your 208 or 230V tap) and the 24V secondary leads, then unbolt the transformer and barrier from the bracket.
5. Install — Mount the new transformer and 24V barrier, land the primary leads on the correct voltage tap, and reconnect the 24V secondary per your photo.
6. Test — Restore power and confirm 24–28V across the secondary, then verify the thermostat commands cooling and heating normally.

Signs You Need a Replacement

• No 24V control power — thermostat blank or unit fully unresponsive
• Repeatedly blown low-voltage fuse on the control board
• Transformer hums loudly, runs very hot, or smells burnt
• 0V or low voltage measured on the secondary under load

Shipping & Returns

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