Commercial symptom guide · ICY AC
The rooftop unit is one machine inside a larger building system.
Packaged rooftop units combine cooling, heating, fans, filters, outdoor air and controls. A fault at the unit can matter greatly, while curb leakage, ducts, zones and building load still decide what occupants feel.
What people notice
Reported symptoms
- Unit runs but zone temperature remains high
- Short cycling, alarms or repeated lockouts
- Outdoor-air, fan or damper behavior does not match the sequence
What may interact
Plausible systems
Refrigeration, coil, fan, belt or filter condition
Economizer, damper, sensor or control-sequence fault
Power quality, disconnect, contactor or staging issue
Curb, duct, return, zone or load condition outside the cabinet
The first useful field packet
Collect facts that can change the decision.
Record the building under the condition that produces the complaint. Keep direct observations, measurements, trade findings and working explanations visibly separate.
- 01
Exact model, serial, configuration and service history
- 02
Operating mode, alarms, controls and electrical findings
- 03
Coil, fan, filter, damper and refrigerant evidence from the qualified trade
- 04
Delivered airflow and occupied-zone result
Avoid expensive loops
Do not buy the next guess.
- Stopping at the first failed component
- Disabling outdoor air or safeties as a comfort shortcut
- Replacing an RTU without checking curb, duct, electrical and control compatibility
Straight answers
Questions businesses ask first.
Why is my rooftop unit running but the store is hot?
The RTU may have a capacity or control fault, or conditioned air may not reach the zone. Outdoor air, return paths, ducts, roof load and controls all need context.
What are common commercial RTU problems?
Airflow restriction, fouled coils, fan or belt faults, charge or leakage problems, damper and economizer faults, sensors, schedules and electrical conditions are common investigation lanes.
Can ICY replace a rooftop unit?
ICY can define and coordinate an accepted scope. The responsible licensed contractor, permit path, equipment selection, crane or rigging, electrical work and commissioning are identified in writing for the exact project.
This guide cannot diagnose the building, promise a provider or authorize regulated work. ICY confirms the location, responsible parties, credentials, travel, price, schedule and acceptance criteria before work begins.
Complaint · operating state · field facts
Turn the symptom into one written scope.
Send the address, time pattern, equipment labels and prior findings. ICY will define the next useful checks.