Checking Guide Vane Linkage — When the chiller
is off, the guide vanes are closed and the actuator mechanism is
in the position shown in Fig. 37. If slack develops in the drive
chain, do the following to eliminate backlash:
1. With the chiller shut down and the actuator fully closed,
remove the chain guard and loosen the actuator bracket
2. Loosen guide vane sprocket adjusting bolts.
3. Pry bracket upwards to remove slack, then retighten the
bracket hold-down bolts.
4. Retighten the guide vane sprocket adjusting bolts. Ensure
that the guide vane shaft is rotated fully in the clockwise
direction in order close it fully.