Labconco Logic+ A2, Technical Manual

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Front Sash
The glass sash utilizes a cable and pulley system with counter weights located in the
right and left end service compartments. This section describes adjustments or repairs
to the sash or sash sensors.
Sash Level Adjustment
The sash and its two counter weights are joined together with two sash cables, one per
counter weight. The sash cables run on pulleys, which are joined together by a
common axle. Each pulley is locked to this axle with a cotter pin. This prevents the
sash from racking when raised from only one end of the sash glass. The sash should
have approximately 1/8 inch (3 mm) of lateral play or movement. Under normal
operation, the sash should remain level. Occasionally, during transport of the biosafety
cabinet, the sash may become unlevel. Follow the instructions below to resolve this
issue.
1. Lower the sash until it is fully closed. Identify which end of the sash is high.
2. Hinge open or remove the side panel on the high end of the sash. Side panel
access and removal is described earlier in this section under Removal of
External Dress Panels .
3. Using pliers, grasp the S-Hook atop the counterweight. Pull up on the
counterweight to allow some slack in the sash cable. See Figure 12-3.
4. The high end of the sash should lower against the sash stop, and the sash is
now level. Carefully lower the counterweight and sash cable back onto the
pulley.
Figure 12-3
S-Hook
Pliers
Counter
weight