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CVHE-SVU01E-EN
94
Maintenance
Figure 33. Rotary valve in drain position
Front View with Refrigerant Pump
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.
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 CVHF and 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
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.