ICP Thermostat for RYB023GAA — 3AAT82B35A2 ARCO | Ships Today

Overview

This OEM thermostat / temperature control (part #1526859, ARCO 3AAT82B35A2) provides the temperature-sensing and switching logic for the ICP RYB023GAA system. It monitors conditioned-space or coil temperature and signals the low-voltage control circuit to call for heating or cooling. A failing thermostat produces erratic temperature control, a system that won't respond to setpoint changes, or contacts that no longer make and break cleanly. Installing a correct OEM control restores accurate, repeatable operation and proper staging on the 24V control circuit.

Specifications

Compatibility

Direct OEM replacement for the ICP / Tempstar / Heil RYB023GAA system and matching ICP-family equipment that originally used the ARCO 3AAT82B35A2 control. Confirm the part number and terminal layout against your existing control 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 service panel to reach the control and its mounting location.
3. Document — Photograph all wiring and terminal connections before disconnecting.
4. Remove — Disconnect the leads and detach the old thermostat control from its bracket or clip.
5. Install — Mount the new control and reconnect each lead to the matching terminal per your photo.
6. Test — Restore power and confirm the control responds correctly to a call for heating or cooling.

Signs You Need a Replacement

• System ignores setpoint changes or fails to call for heating/cooling.
• Erratic, inaccurate, or drifting temperature control.
• Contacts stick, chatter, or fail to make and break reliably.
• Visible corrosion, burning, or damage on the control body or terminals.

Shipping & Returns

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