Indoor Control Circuit Board for Alegria Platinum FPA-18

ComfortStar Indoor Control Circuit Board – For Alegria Platinum FPA-18

The ComfortStar Indoor Control Circuit Board is the primary control interface for managing operation and communication within the Alegria Platinum FPA-18 indoor HVAC unit. This component processes inputs from system sensors and thermostats and regulates fan speeds, mode switching, and safety lockouts for reliable performance in ductless heat pump systems.

Designed for direct replacement in the FPA-18 model, this board ensures consistent operation and precise coordination with the matching outdoor unit. Its compact layout supports factory mounting locations and terminal connections, minimizing installation time during service or repair.

Key Features

• OEM-Compatible: Direct replacement for Alegria Platinum FPA-18 indoor unit main PCB
• System Control: Manages mode changes, indoor fan speed, and communication with outdoor inverter board
• Diagnostic Interface: Supports fault code signaling for system troubleshooting
• Power Input: Accepts 24V control signal input with low-voltage wiring connections
• Relay and Sensor Ports: Integrated terminals for thermistor, fan motor, and float switch inputs

Technical Specifications

• Model Application: ComfortStar Alegria Platinum FPA-18 indoor units
• Operating Voltage: 24V low-voltage signal input
• Board Dimensions: Form-fitted for FPA-18 panel layout
• Mounting: Pre-drilled holes for secure installation in OEM bracket
• Certifications: UL recognized component; meets HVAC control standards

Installation Guidance

This control board should be installed by trained HVAC professionals with experience in ductless system electronics. Prior to replacement, verify correct part number and perform system shutdown and capacitor discharge. After installation, reconnect wiring per unit diagram and confirm functionality through diagnostic LED indicators and system test cycle.

Required Tools

• Multimeter for voltage verification
• Screwdriver set (Phillips and flat-head)
• Needle-nose pliers for terminal handling

Field Use and Application

• Used in service replacement for non-responsive or damaged indoor boards
• Supports demand-controlled fan operation and signal processing
• Critical for maintaining inverter system efficiency and communication

Important Notes for Contractors

Always match this board with the correct system revision for the FPA-18 indoor model. Ensure all thermistor and sensor connections are secure, and confirm power polarity during wiring to avoid board damage. Full functional test is recommended post-installation to confirm communication and output relay control.