At-A-Glance
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NA7.12.1 Parking Garage Exhaust |
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Use Document NRCA-PRC-03-F |
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Purpose of the Test |
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Verify that airside economizers function properly |
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Instrumentation |
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Space differential pressure sensor CO span gas with a concentration of 30 ppm (+/- 2 percent) |
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Test Conditions |
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Each CO sensor has a valid factory calibration certificate (+/-5 percent) CO sensors are located in areas of high CO concentration per 120.6(c) CO control setpoint is at or below 25ppm for all sensors per 120.6(c) |
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Estimated Time to Complete |
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Construction inspection: 1 hour |
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Functional testing: 2 hour |
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Acceptance Criteria |
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During a time of low activity |
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All sensors active and reading a setpoint of <25ppm Exhaust fans are running at minimum speed. Exhaust fans are drawing <30 rated power. |
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Applied required CO span gas testing |
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All sensors active and reading a setpoint of between 25 and 35ppm Exhaust fans are running at maximum speed. Exhaust fans go back to minimum speed when span gas is removed. |
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Temporary override of the programmed sensor calibration/replacement; observation that fans ramp to full speed and an EMCS alarm is set. System in unoccupied mode: observation that fans ramp to full speed and an alarm is received by the facility operators. Programmed occupied sensor proximity zone alarm differential; observation that fans ramp to full speed and an alarm is received by the facility operators. |
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Potential Issues and Cautions |
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Coordinate test procedures with the facility supervisor since they may be needed to assist with the manipulation of the control system. |
A. Test Application
Newly Constructed and Additions/Alterations: All newly installed parking garage ventilation systems with carbon monoxide control must be tested.
B. Construction Inspection
Verify and document the following tests prior to the functional testing:
•Carbon monoxide control sensor is factory-calibrated per §120.6(c).
•The sensor is located in the highest expected concentration location in its zone per §120.6(c).
•Control setpoint is at or below the CO concentration permitted by §120.6(c).
C. Functional Testing
Conduct the following tests with garage ventilation system operating in occupied mode and with actual garage CO concentration well below setpoint.
Step 1: With all sensors active and all sensors reading below 25 ppm, observe that fans are at minimum speed and fan motor demand is no more than 30 percent of design wattage.
Step 2: Apply CO span gas with a concentration of 30 ppm, and a concentration accuracy of +/- 2 percent, one by one to 50 percent of the sensors but no more than 10 sensors per garage and to at least one sensor per proximity zone. For each sensor tested observe:
•CO reading is between 25 and 35 ppm.
•Ventilation system ramps to full speed when span gas is applied.
•Ventilation system ramps to minimum speed when span gas is removed.
Step 3: Temporarily override the programmed sensor calibration/replacement period to 5 minutes. Wait 5 minutes and observe that fans ramp to full speed and an alarm is received by the facility operators. Restore calibration/replacement period.
Step 4: Temporarily place the system in unoccupied mode and override the programmed unoccupied sensor alarm differential from 30 percent for 4 hours to 1 percent for 5 minutes. Wait 5 minutes and observe that fans ramp to full speed and an alarm is received by the facility operators. Restore programming.
Step 5: Temporarily override the programmed occupied sensor proximity zone alarm differential from 30 percent for 4 hours to 1 percent for 5 minutes. Wait 5 minutes and observe that fans ramp to full speed and an alarm is received by the facility operators. Restore programming.