Indoor Control Circuit Board for Alegria Platinum CPA-18

ComfortStar C70290050 Indoor Control Board – OEM Module for Alegria Platinum CPA-18

The ComfortStar C70290050 is the designated indoor control circuit board for use with Alegria Platinum CPA-18 ductless mini-split systems. This board manages indoor fan operation, signal communication with the outdoor unit, thermistor input processing, and mode control functions. It is factory-engineered for compatibility with inverter-driven equipment and supports system diagnostics, safety interlocks, and control relay logic.

Designed for direct system replacement, this control module features matching terminals and harness points for the CPA-18 indoor air handler, allowing for straightforward installation without the need for field modification.

Functional Overview

• System Role: Controls indoor fan speed, mode operation, and transmits sensor data to the outdoor unit
• Board Type: Low-voltage indoor logic PCB with onboard relays and diagnostic indicators
• Control Signal: 24V AC input, with serial communication support to outdoor inverter drive
• Interface: Connects to display panel, thermistors, swing motor, and fan motor output

Technical Specifications

• Model: C70290050
• Voltage: 24V signal power
• System Compatibility: ComfortStar Alegria Platinum CPA-18 indoor units
• Mounting: Preconfigured for CPA-18 air handler chassis with standard terminal layout
• Compliance: Manufactured to HVAC industry safety and performance standards

Installation Requirements

Installation of the C70290050 control board should be performed by HVAC professionals. Prior to installation, disconnect all power sources and verify the existing board part number. Use manufacturer documentation to confirm wiring alignment and control logic. After replacement, confirm fan motor operation, communication status, and sensor input response.

• Tools Needed: Multimeter, insulated screwdrivers, manufacturer wiring diagram
• Precautions: Handle with ESD protection; confirm all connections before re-energizing

Contractor Application Notes

• Restores indoor unit control in systems with non-responsive fan, mode switching issues, or display errors
• Supports system fault diagnostics via integrated indicator LEDs or remote panel codes
• Intended for field replacement during routine service or as part of OEM repair protocols

Summary

The ComfortStar C70290050 indoor control circuit board is an original replacement module specifically for CPA-18 ductless systems. Designed to restore full control logic and support operational accuracy in inverter-driven HVAC applications, this board is suitable for warranty replacement, service part swaps, or component-level repair operations in field settings.