Product Service 1-800-522-7658
92
Type B2 Total Exhaust Volume
The total volume of air exhausting from the cabinet can be determined as follows:
Note: The dress panel MUST be installed on the cabinet to obtain an accurate inflow
value.
Note: The exhaust volume noted with a DIM on the front of the cabinet may not agree
with the value obtained from a traditional Pitot tube or thermal anemometer traverse
reading of the exhaust duct.
1.
Shut off the cabinet blower.
2.
Remove the prefilter element from the top of the cabinet.
3.
Completely seal the air intake opening with tape or plastic film secured with
tape.
4.
Seal a DIM to the face of the Logic+.
5.
Record at least 10 inflow volumes, and average the results. The total exhaust
volume should approximately equal the value shown in Table 5-7.
Table 5-7
Total Exhaust Volume Specifications
Model
30348
30368
DIM-measured Exhaust
(CFM)
665+/-15
998+/-20
Traverse-measured
Exhaust (CFM)
810
1218
Type B2 Exhaust (Inflow) Alarm Setpoint
The exhaust alarm setpoint must be entered during the calibration procedure. To do
this:
1.
With the cabinet operating at its nominal inflow in the calibration mode at the
alarm setpoint screen, ensure that a properly operating DIM or thermal
anemometer (for secondary inflow) is properly positioned at the face of the
Logic+.
2.
Close the exhaust damper until the inflow equals 80% of the total exhaust
volume, as shown in Table 5-8.
3.
Press the ‘OK’ button when the proper inflow is obtained.
4.
Return the damper to the position required for nominal inflow and lock the
damper in position.
Table 5-8
Inflow Alarm Volume Specifications
Model
30348
30368
Nominal Inflow (CFM)
283 +/-13
423+/-20
Inflow alarm setpoint volume (CFM)
150 +/- 5
223 +/- 5
