Step1: Turn off power to the HVAC system to ensure safety.
Step2: Remove the unit access panel to locate the existing fan motor controller.
Step3: Disconnect all wiring from the old controller, noting connections for reference.
Step4: Unscrew and remove the old controller from its mounting.
Step5: Install the new controller in the same position and secure with screws.
Step6: Reconnect all wiring according to your notes.
Step7: Replace the access panel and restore power.
Step8: Test the fan operation to ensure proper function.