Run Packaged Rooftop Unit Economizer Functional Test — Free

Test Setup and Equipment Identification

RTU identification matches test record critical (required)

Verify unit tag, location, model, and serial number match the inspection record and control sequence documentation.

Test conditions documented

Record outdoor air temperature, return air temperature, occupancy status, and whether the unit is in occupied mode.

Controls sequence and setpoints available critical (required)

Confirm the current economizer sequence of operation, mixed air setpoint, minimum outdoor air position, and high-limit lockout settings are available for review.

Yes No N/A

Unit accessible for safe testing critical (required)

Verify rooftop access, fall protection, and safe access to dampers, sensors, and control panels before testing begins.

Yes No N/A

Damper Stroke and Mechanical Operation

Outdoor air damper strokes smoothly through full range critical (required)

Command the damper from minimum to full open and verify full travel without binding, chatter, or abnormal noise.

Yes No N/A

Return air damper responds oppositely to outdoor air damper command

Verify return air damper movement is coordinated with outdoor air damper operation and does not stick or lag.

Yes No N/A

Minimum outdoor air position achieved critical (required)

Measure or confirm the minimum outdoor air position against the design or sequence requirement.

Note (optional)

Damper linkage and actuator condition acceptable

Inspect linkage, actuator mounting, fasteners, and blade condition for looseness, damage, or misalignment.

Yes No N/A

Damper position feedback matches commanded position critical (required)

Verify feedback signal or indication corresponds to the actual damper position within acceptable tolerance.

Yes No N/A

Sensor Calibration and Control Response

Outdoor air temperature sensor calibrated critical (required)

Compare sensor reading to a calibrated reference and confirm acceptable accuracy.

Note (optional)

Mixed air temperature sensor calibrated critical (required)

Compare mixed air sensor reading to a calibrated reference and confirm acceptable accuracy.

Note (optional)

Controller responds to economizer enable/disable command critical (required)

Verify the controller changes damper position and mode status appropriately when economizer operation is enabled and disabled.

Yes No N/A

Sensor wiring, mounting, and shielding acceptable

Inspect sensor placement, wiring terminations, and protection from direct solar gain or physical damage.

Yes No N/A

High-Limit Lockout and Free Cooling Logic

High-limit lockout setting matches design intent critical (required)

Verify the configured high-limit strategy and setpoint align with the project requirements and applicable economizer sequence.

Note (optional)

High-limit lockout prevents economizer operation when required critical (required)

Simulate or verify outdoor conditions above the lockout threshold and confirm outdoor air damper does not provide free cooling.

Yes No N/A

Mechanical cooling stages engage when economizer is locked out critical (required)

Confirm compressor or mechanical cooling stages operate as intended when economizer free cooling is unavailable.

Yes No N/A

Mixed air temperature remains within safe operating range

Observe mixed air temperature during lockout and verify it remains within the acceptable range for the unit and controls sequence.

Note (optional)

Exceptions, Corrective Actions, and Approval

Deficiencies documented with corrective actions

Record each deficiency, responsible party, target completion date, and required corrective action.

Inspection result reviewed with responsible party

Confirm findings were communicated to the owner, facility representative, or commissioning authority.

Yes No N/A

Inspector signature critical (required)

Inspector attests that the functional test was performed and results were recorded accurately.

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Run: Packaged Rooftop Unit Economizer Functional Test

Test Setup and Equipment Identification

Damper Stroke and Mechanical Operation

Sensor Calibration and Control Response

High-Limit Lockout and Free Cooling Logic

Exceptions, Corrective Actions, and Approval

Get your results