Indoor Control Circuit Board for Alegria Platinum FPA-36DU

ComfortStar C44490074 Indoor Control Board – OEM Module for Alegria Platinum FPA-36DU

The ComfortStar C44490074 indoor control circuit board is the designated OEM replacement for Alegria Platinum FPA-36DU ductless systems. This board manages core indoor unit functions including temperature regulation, fan motor control, thermistor feedback, and communication with the outdoor inverter board.

Designed for direct replacement, this control module integrates seamlessly into the FPA-36DU indoor chassis. It features multi-point input/output terminals for indoor fan operation, swing actuator control, and communication signal routing. Installation should be performed by qualified HVAC technicians following standard service protocols.

Application and Use

• Part Number: C44490074
• System Compatibility: Alegria Platinum FPA-36DU indoor air handler
• Voltage Input: 24V AC (signal)
• Function: Indoor logic board – controls fan speed, thermistor processing, and external comms
• Interface: Connects to factory harness, thermistors, and display panel

Installation Guidance

Installation requires system power isolation, confirmation of thermistor values, and alignment of OEM harnesses. The board mounts directly to the existing bracket inside the FPA-36DU housing.

• Tools Required: Multimeter, insulated screwdrivers, torque driver
• Pre-checks: Verify wiring continuity and correct thermistor placement
• Technician Note: Use ESD precautions to prevent component damage

Technical Features

• Factory-Matched Logic Board – Ensures full compatibility with OEM communication protocols
• Control Function Integration – Manages indoor fan output, room and coil thermistor feedback, and operational mode switching
• Compact Design – Installs into original bracket location without structural modifications
• Stable Communication – Interfaces with inverter control system via standard ComfortStar communication bus

Use Cases

• Replacement for failed or intermittent indoor control logic in FPA-36DU systems
• Service component in field diagnostics involving signal faults or display malfunctions
• Planned part replacement as part of periodic system maintenance

Summary

The ComfortStar C44490074 control board restores factory logic and control functionality to the FPA-36DU indoor unit. It manages all indoor operations from fan output to inverter synchronization. Ideal for contractor-grade repairs, field replacements, or warranty service work where full OEM functionality is required.