66
BAS-SVX48H-EN
the damper), this is less accurate than setting the OA damper position setpoints based on
measured outdoor airflow.
EExxaammppllee:: For the unit ventilator serving this example K-12 classroom, the fan airflow when
operating at maximum speed is 1200 cfm, and the fan airflow at minimum speed is 720 cfm. As
calculated in Steps 1 and 2, the design outdoor airflow rate (V
ot-Design
) is 470 cfm and the DCV
minimum outdoor airflow rate (V
ot-DCVmin
) is 120 cfm.
• Design Minimum OA Damper Position at Maximum Fan Speed = 470 cfm / 1200 cfm = 40%
• DCV Minimum OA Damper Position at Maximum Fan Speed = 120 cfm / 1200 cfm = 10%
• Design Minimum OA Damper Position at Minimum Fan Speed = 470 cfm / 720 cfm = 65%
• DCV Minimum OA Damper Position at Minimum Fan Speed = 120 cfm / 720 cfm = 15%
SSeettttiinnggss ffoorr CCOO
22
--BBaasseedd DDeemmaanndd CCoonnttrroolllleedd VVeennttiillaattiioonn
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