Labconco XPert Filtered Balance Stations 3962622 User Manual

Page 45

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Chapter 6: Maintaining Your Filtered Enclosure

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41

External Alarm allows an external signal to sound the alarm, such as a sash
open switch, or a “fail” signal from the building airflow system.

Alarm Disable allows an external signal to prevent a “low” airflow alarm from
occurring.

Night Setback allows an external signal to prevent a “low” airflow alarm from
occurring (not any different from Alarm Disable above other than the
terminology.)


Contact Labconco for ordering information on this special PCB.

Calibration

1. Ensure the flow switch and alarm circuit board are installed and

operational.

2. Allow the enclosure to operate for at least two minutes.

3. If factory installed, the monitor will alarm at 60±10 fpm with the inflow

velocity set at 90±10 fpm.

4. To change the factory setting, set the inflow velocity required by your

Safety Officer to the desired alarm condition using the speed control
adjustment procedure outlined in Chapter 6.

5. Once the alarm condition is set, use a small screwdriver to turn the

adjustment screw on the airflow switch counterclockwise (facing the
screw) until the “low” airflow red LED lights and the audible flow alarm
sounds.

6. Adjust the inflow velocity to the nominal operating point required by your

Safety Officer.

7. Over time the HEPA filter will load and eventually slow the inflow

velocity. Once the alarm condition is met, simply increase the speed
control outlined in Chapter 6 or replace the HEPA filter if the speed control
is maximized.

8. The table below lists typical alarm conditions based on normal operating

conditions. Typical alarm conditions are set at face velocities of 10 to 30
feet per minute below the normal operating conditions due to supply air
and exhaust air fluctuations, as well as room air cross drafts. Consult your
Safety Officer for proper operating speeds.

Enclosure Operating In-Flow

Speed

Alarm Condition Set Point

Speed

100 ± 10 fpm

70-90 fpm

90 ± 10 fpm

60-80 fpm

80 ± 10 fpm

50-70 fpm

70 ± 10 fpm

50-60 fpm

60 ± 10 fpm

50 fpm

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