Lillian Custom Homes Office Case Study
Rooftop Unit (RTU) Diagnostics | Electrical Phase Loss Troubleshooting | Compressor Protection Reset
Customer
Lillian Custom Homes
Industry
Commercial Office Building | Light Commercial HVAC | Facilities Management
The Challenge
Lillian Custom Homes contacted B.I.M.S. after being advised that multiple rooftop units (RTUs) required full replacement due to compressor failure and a reported electrical phase loss condition.
The initial diagnosis suggested that the compressors were damaged and the equipment was no longer operational, which would have resulted in unnecessary system replacement and significant capital expense.
Before moving forward with replacement, B.I.M.S. was called to perform a second opinion inspection and verify the true condition of the equipment.
Comprehensive HVAC Diagnostic Evaluation
Upon arrival, B.I.M.S. technicians performed a detailed evaluation of the rooftop units, including electrical supply verification, compressor status checks, phase monitoring, and operational testing.
During the inspection, we confirmed that the units had previously experienced a loss of electrical phase due to a utility issue. However, the compressors themselves were not mechanically failed.
Instead, the compressors had been shut down on internal overload protection as a safeguard during the power disruption.
Once proper electrical power was restored from the utility provider, the systems only required a reset and proper startup sequence.
The B.I.M.S. Solution
Rather than replacing costly rooftop units or compressors, B.I.M.S. restored proper operation through controlled system verification and startup procedures.
Our technicians:
- Verified incoming electrical power and phase stability
- Confirmed compressor internal overload protection status
- Reset compressor safety controls after power restoration
- Tested each rooftop unit under normal operating conditions
- Verified refrigerant system pressures and temperatures
- Confirmed proper cooling performance across all units
After completing the reset and testing process, all rooftop units returned to normal operation without requiring compressor replacement or major repairs.
The Results
The HVAC systems were fully restored to proper operation, eliminating the need for unnecessary equipment replacement. The facility avoided significant capital expense and regained full cooling capacity across the office building.
This case highlights the importance of accurate diagnostics in commercial HVAC systems, particularly when electrical issues such as phase loss can mimic major mechanical failures.
Why B.I.M.S.
Many HVAC systems are misdiagnosed when electrical faults trigger compressor protection systems. B.I.M.S. specializes in advanced commercial HVAC diagnostics, including electrical troubleshooting, compressor protection analysis, and rooftop unit system verification.
Our approach focuses on identifying the true root cause of failures before recommending costly repairs or replacements, helping customers avoid unnecessary expenses and downtime.
Services Provided
- Rooftop Unit (RTU) Diagnostics
- Electrical Phase Loss Troubleshooting
- Compressor Overload Reset
- Commercial HVAC Service
- Electrical System Verification
- Preventive Maintenance
- HVAC Controls Inspection
- System Startup & Commissioning
- Mechanical System Diagnostics
Equipment We Service
B.I.M.S. services:
- Rooftop Units (RTUs)
- Commercial Packaged HVAC Systems
- Split Systems
- Air Handlers
- Condensing Units
- Commercial HVAC Controls
- Electrical HVAC Components
- Commercial Office HVAC Systems
Accurate HVAC Diagnosis Matters
Electrical issues such as phase loss can often lead to misdiagnosis of major HVAC failures. In many cases, compressors and major components are incorrectly identified as failed when they are actually protected by safety systems.
B.I.M.S. provides expert commercial HVAC diagnostics to ensure accurate troubleshooting, prevent unnecessary equipment replacement, and restore systems to proper operation quickly and efficiently.
Whether you need RTU diagnostics, compressor troubleshooting, electrical HVAC repair, or second-opinion inspections, B.I.M.S. delivers precise solutions that save time and reduce costs.