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5. Close the charging valve on the machine. Remove the copper tube if no longer required.
Repair the Leak, Retest, and Apply Standing Vacuum Test
After pressurizing the machine, test for leaks with an electronic, halide leak detector, soap
bubble solution, or an ultrasonic leak detector. Bring the machine back to atmospheric
pressure, repair any leaks found, and retest.
After retesting and finding no leaks, apply a standing vacuum test, and then dehydrate the
machine. Refer to the Standing Vacuum Test and Machine Dehydration in the Before Initial
Start-Up section.
Checking Guide Vane Linkage
When the machine is off, the guide vanes are closed and the actuator mechanism is in the
position shown in Figure 38. If slack develops in the drive chain, backlash can be eliminated as
follows:
1. With the machine shut down and the actuator fully closed, remove the chain guard and
loosen the actuator bracket holddown bolts.
2. Loosen guide vane sprocket adjusting bolts.
3. Pry bracket upwards to remove slack, then retighten the bracket holddown bolts.
4. Retighten the guide vane sprocket adjusting bolts. Make sure that the guide vane shaft is
rotated fully in the clockwise direction in order for it to be fully closed.