Your inspector is likely correct. Here's why, and what you need to do

Reasons for Separate Circuits:
Code Compliance (NEC)

National Electrical Code (NEC) Section 430.53(C) generally requires each motor (and in your case, the blower motors are the primary load) to have its own individual branch circuit unless specific exceptions apply. While a 5A blower motor might seem insignificant, inspectors are very strict about motor circuits.

Overload Protection

Each motor needs individual overload protection. A single breaker protects the entire circuit, not the individual motors from overheating due to a locked rotor or other motor failure. Your disconnects are for isolation, not for overload protection.

Safety

If one motor fails and draws excessive current, a single breaker could be overloaded and trip, shutting down both air handlers. Separating them ensures that one failure doesn't impact the other.

Future Issues

Even if they run perfectly now, a motor's amp draw can increase as it ages. Running close to the breaker's capacity makes the system more susceptible to nuisance tripping.

What You Need to Do


Run a Dedicated Circuit for Each AHU

You need to run a separate branch circuit from your electrical panel to each of your air handler disconnects. Each circuit needs its own properly sized circuit breaker in your electrical panel.2.

Wire Sizing

Wire Gauge: Typically, 14 AWG copper wire is sufficient for a 5 amp load on a 15 amp breaker. However, you should always consult with a qualified electrician and refer to the NEC wire ampacity charts to determine the correct wire size based on: The ampacity of the blower motors (nameplate rating). The length of the wire run (voltage drop considerations). The type of wiring method (e.g., NM cable, conduit). The termination temperature rating of the equipment. Breaker Size: A 15 amp breaker is commonly used for 14 AWG wire and can handle the 5 amp load with plenty of headroom.3.

Grounding

Ensure both AHUs are properly grounded to the electrical system. This is a critical safety measure.

Important Considerations



Consult with a Licensed Electrician

I strongly recommend hiring a licensed electrician to perform this work. Electrical work can be dangerous and must be done according to code. An electrician can: Verify the inspector's assessment. Calculate the correct wire sizes and breaker sizes. Ensure the installation is safe and compliant with all local electrical codes. Pull the necessary permits (if required).

Documentation

Keep records of the work performed, including permits, inspections, and electrician's invoices.

AHU Nameplate

Carefully check the nameplate on each air handler unit. It will list the voltage, amperage, and other electrical specifications. Use this information to select the correct wire and breaker sizes.

In Summary:

You need to run a separate, dedicated circuit with its own breaker from your electrical panel to each air handler unit. Get a licensed electrician to do this to ensure safety and code compliance. Flag for review