American Standard CH530 manual Rotary valve in drain position, Front View with Refrigerant Pump

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 vacuum-tight and will become a leak path.

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 O-Rings to seal to atmosphere. These should be manually lubricated by removing the pipe plug at the valve lubrication port and placing a few drops of Trane OIL00022 in the cavity. Be sure to reinstall the pipe plug when lubrication is completed.

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 re-install it into the lubrication port. Tighten the plug to hand tight plus 1/4 to 1/2 turn.

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 o-rings of the assembly. If this occurs then remove one of the lubrication plugs, remove some of the grease, then re-install the plug.

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. Re-install any insulation that was cut or removed. The unit may be restarted.

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

98 CDHF-SVU01C-EN