ICP 40VA Transformer for RH5420482 — 208/240V to 24V | Ships Today

Overview

This genuine OEM control transformer (Part #1540372) supplies low-voltage power for ICP, Heil, and Tempstar systems, including model RH5420482. It steps 208/240V line voltage down to 24V at 40VA to power the thermostat, contactor coil, relays, and control board. When a transformer fails — from an internal short, an overloaded secondary, or a control short circuit — the entire low-voltage control system goes dead: the thermostat is blank, the contactor won't pull in, and the system won't respond to a call for heating or cooling. A 40VA rating provides ample capacity for standard residential control circuits.

Specifications

Compatibility

Directly fits ICP/Heil/Tempstar model RH5420482 and related ICP-family units that use a 208/240V-to-24V, 40VA control transformer. Verify your existing primary tap configuration and mounting before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the unit service/control panel.
3. Document — Photograph all primary and secondary leads before disconnecting.
4. Remove — Disconnect the line-voltage primary and 24V secondary leads, then unmount the old transformer.
5. Install — Mount the new transformer, match the primary tap to your supply voltage, and reconnect leads per your photo.
6. Test — Restore power and confirm 24V on the secondary and normal control operation.

Signs You Need a Replacement

• Blank thermostat / no low-voltage power
• System completely unresponsive to heat or cool calls
• No 24V reading at the secondary terminals
• Burnt smell or visible scorching on the transformer

Shipping & Returns

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