Assortment / System Description

Room pressurization and fume hood control
Fume hood
21
208 | 275 A6V10866237_en--_b_08
Description Parameter Default value
Switch delay after emergency to emergency setpoint
▶ If a time value other than 0 is used, then during an
emergency purge the fume hood exhaust damper
opens to 100% for that amount of time, after which
the damper will go to the emergency purge setpoint
value in the fume hood exhaust air setpoint AF
(FhSpEhxx).
SwiDlySpEmg 300 [s]
Low air volume flow alarm limit LoAirFlAlmLm 70 [%]
Low air volume flow warning limit LoAirFlWarnLm 85 [%]
High air volume flow warning limit
▶ If the client chooses not to use the high flow
warning limit, set to a high value such as 500%.
HiAirFlWarnLm 135 [%]
High air volume flow alarm limit
▶ If the client chooses not to use the high flow
alarm limit, set to a high value such as 500%.
HiAirFlAlmLm 150 [%]
Switch-on delay for alarms
▶ Set long enough to eliminate nuisance alarms, and
short enough to satisfy safety concerns.
DlyOnAlm 5 [s]
21.9.1 Special operating modes
Under normal circumstances, the fume hood operates according to the
selected, normal exhaust flow control strategy. Special modes may be
implemented for special circumstances that arise in a laboratory. Configuration