ICP 40VA Transformer for WPG3484115RKC1 — 208/230V to 24V | Ships Today

Overview

This genuine ICP control transformer (OEM part 1173691) supplies the low-voltage power that runs the thermostat, control board, relays, and contactor coil on the WPG3484115RKC1 package unit. Rated at 40VA, it steps the incoming 208/230V line voltage down to a stable 24V class-2 control circuit. This kit also includes the matching 24V barrier (OEM 1178431) for safe, code-correct terminal isolation. When a transformer fails — usually from a shorted control wire or a stuck contactor drawing excess current — the entire low-voltage side goes dead: no thermostat response, no calls for heat or cool, and no contactor pull-in. Installing a correctly rated 40VA replacement restores full control-circuit operation.

Specifications

Compatibility

Direct-fit replacement for the ICP Tempstar Heil WPG3484115RKC1 package unit, matching the original mounting footprint, primary tap leads, and 24V secondary output. Verify your line voltage tap (208V vs 230V) when wiring.

Installation Guide

1. Safety First — Disconnect power at the unit disconnect and verify zero voltage with a multimeter.
2. Access — Remove the control panel cover.
3. Document — Photograph every primary and secondary lead before disconnecting.
4. Remove — Disconnect the leads, unbolt the old transformer, and discard.
5. Install — Mount the new transformer, install the 24V barrier, and reconnect the correct primary tap and 24V secondary per your photo.
6. Test — Restore power and confirm 24V across the secondary and proper thermostat/contactor response.

Signs You Need a Replacement

• No 24V output measured at the secondary terminals
• Thermostat is blank or the system won't respond to any call
• Contactor or control board won't energize
• Burnt smell, discolored windings, or a tripped/blown low-voltage fuse

Shipping & Returns

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