Trim Refrigerant Charge; Weekly Maintenance; Check The Lubrication System; Scheduled Maintenance - Carrier AquaEdge 19XR Start-Up, Operation And Maintenance Instructions Manual

GUIDE VANE
ACTUATOR
NOTE: Rotate coupling clockwise to close guide vanes.
Rotate coupling counterclockwise to open guide vanes.

Trim Refrigerant Charge

If to obtain optimal chiller performance it becomes necessary
to adjust the refrigerant charge, operate the chiller at design
load and then add or remove refrigerant slowly until the differ-
ence between the leaving chilled water temperature and the
cooler refrigerant temperature reaches design conditions or be-
comes a minimum. Do not overcharge.
Refrigerant may be added either through the storage tank or di-
rectly into the chiller as described in the Charge Refrigerant
into Chiller section.
To remove any excess refrigerant, follow the procedure in
Transfer Refrigerant from Chiller to Pumpout Storage Tank
section, Steps 1a and b, page 35.

WEEKLY MAINTENANCE

Check the Lubrication System

Mark the oil level on the reservoir sight glass, and observe the
level each week while the chiller is shut down.
If the level goes below the lower sight glass, check the oil reclaim
system for proper operation. If additional oil is required, add it
through the oil drain charging valve (Fig. 2). A pump is required
when adding oil against refrigerant pressure. The oil charge for the
19XR two-stage compressor frame size 6 is 29 gal. (110 L); for
frame size 7 the oil charge is 44.5 gal (168 L).
The added oil must meet Carrier specifications for the 19XR
chiller. Refer to Changing Oil Filter and Oil Changes sections.
Any additional oil that is added should be logged by noting the
amount and date. Any oil that is added due to oil loss that is not
related to service will eventually return to the sump. It must be
removed when the level is high.
An oil heater is controlled by the PIC 5 control system to main-
tain oil temperature (see the 19XR with PIC 5 Controls Opera-
tion and Troubleshooting manual) when the compressor is off.
If the PIC 5 control system shows that the heater is energized
and if the sump is still not heating up, the power to the oil heat-
er may be off or the oil level may be too low. Check the oil lev-
el, the oil heater contactor voltage, and oil heater resistance.
The PIC 5 control system does not permit compressor start-up
if the oil temperature is too low. The PIC 5 control system con-
tinues with start-up only after the temperature is within allow-
able limits.
SET SCREW
GUIDE VANE
COUPLING
Fig. 31 — Guide Vane Actuator Detail
Establish a regular maintenance schedule based on your actual
chiller requirements such as chiller load, run hours, and water
quality. The time intervals listed in this section are offered as
guides to service only.

Service Ontime

The HMI will display a SERVICE ONTIME value on the
MAIN MENU  RUN TIMES screen. This value should be
reset to zero by the service person or the operator each time
major service work is completed so that the time between ser-
vice events can be viewed and tracked.

Inspect the Control Panel

Maintenance consists of general cleaning and tightening of
connections. Vacuum the cabinet to eliminate dust build-up. If
the chiller control malfunctions, refer to the Troubleshooting
Guide section on page 43 for control checks and adjustments.
Ensure power to the starter is isolated when cleaning and tight-
ening connections inside the starter enclosure. Failure to dis-
connect power could result in electrocution. The oil filter
housing is at a high pressure. Relieve this pressure slowly.
Failure to do so could result in serious personal injury.

Changing Oil Filter

Change the oil filter on a yearly basis or when the chiller is
opened for repairs. The 19XR chiller has an isolatable oil filter
so that the filter may be changed with the refrigerant remaining
in the chiller. Use the following procedure:
1.
2.
3.
4.
5.
39
ACTUATOR BRACKET
HOLDDOWN
BOLTS (4)

SCHEDULED MAINTENANCE

WARNING
Ensure the compressor is off and the disconnect for the
compressor is open.
Disconnect the power to the oil pump.
Close the oil filter isolation valves.
Close the isolation valves located on both ends of the oil
filter. Have rags and a catch basin available to collect oil
spillage.
Equalize the filter's higher internal pressure to ambient by
connecting an oil charging hose to the Schrader valve on
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