Maintenance
DO NOT LEAVE GREASE FITTINGS INSTALLED.
If grease fittings have been used for this procedure then they MUST BE REMOVED before returning the unit to service. Grease fittings are not
and the other on the bottom of the operator base. Use the same procedure as described above, except that it will be necessary to temporarily disconnect the vane actuators from the tang operator arms in order to test for a “hydraulically locked” condition.
The oil valve block rotary valve uses dual
9.Using a clean wooden dowel or other similar tool, remove excess grease from the remaining open lubrication port.
10.Clean and then lightly coat the threads of the plug with Rheolube grease and
11.Before reconnecting the vane linkage, grasp the tang operator arm and manually operate the vane assembly. If it is now difficult to move, then the tang operator may have become “hydraulically locked” because of excess grease in the assembly. This situation could cause damage to the
12.Reconnect the linkage to the tang operator arm. Ensure the spacer washers between the linkage and the arm are properly placed and that the assembly does not bind.
To service the 1st and 2nd stage tang operators on CDHF extended capacity chillers with 1470 or 1720 compressors.
The 1st and 2nd stage rotary inlet guide vane tang operators of the extended capacity chillers also require periodic lubrication, at least annually, with R123 compatible Rheolube grease. These actuators have two 1/8" NPT plugs located 180 degrees apart, with one on the top
Figure 37. Rotary valve in drain position
Front View with Refrigerant Pump
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