Trim Refrigerant Charge; Weekly Maintenance; Check The Refrigerant Lubrication System; Check For Leaks - Carrier AquaEdge 19DV Series Start-Up, Operation And Maintenance Instructions Manual

4. If required, rotate the guide vane shaft fully clockwise for
first stage and counterclockwise for second stage and spot-
drill the guide vane actuator shaft. Spot-drilling is neces-
sary when the guide vane actuator sprocket set screws on
the guide vane actuator shaft need to be re-seated.
(Remember: Spot-drill and tighten the first set screw
before spot-drilling for the second set screw.)

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 difference between
the leaving chilled water temperature and the evaporator refriger-
ant temperature reaches design conditions or becomes a mini-
mum. Do not overcharge. Use evaporator sight glasses to visually
determine optimum charge. At steady state full load operation the
evaporator tubes, as viewed in the boiling pool section of the
evaporator, should be covered with liquid refrigerant — if tubes
are covered, maximum efficiency is achieved and there is no bene-
fit of additional refrigerant.
Refrigerant may be added either through the storage tank or di-
rectly into the chiller as described in the Charge Unit with Re-
frigerant section on page 23.
To remove any excess refrigerant, follow the procedure in
Transfer Refrigerant from Chiller to Storage Tank Vessel sec-
tion on page 41.

WEEKLY MAINTENANCE

Check the Refrigerant Lubrication System

1. Enter INPUT menu and verify that Liquid Level Switch is
closed (if compressor is on).
2. Check moisture indicating sight glass on bearing supply
line (Fig. 42) as well as on the motor/VFD liquid cooling
line (located between vessels feeding of the high side float
chamber; sight glass is located downstream of filter drier).
3. Check that pressure Ref Pump Delta P (PRESSURE Menu
is above 13 psig [89.6 kPa]).
Fig. 41 — Guide Vane Actuator Detail

Check for Leaks

Frequent purge pumpout operation is an indication of a leak.
When the daily pumpout limit is exceeded, the controls will
show process Alert 148 — Purge Daily Pumpout Limit Ex-
ceeded. If no alert, the purge run-time for the past 24 hours as
well as the past 7 days can be obtained from RUNTIME menu.
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 resettable "After Service Hrs", "Total
Pumpout Numbers", and "Total Pumpout Time" values on the
Main Menu
to zero by the service person or the operator each time major ser-
vice work is completed so that the time between service events
can be viewed and tracked. Previous values and associated dates
should be logged for future reference prior to resetting.

Inspect the Control Panel

Maintenance consists of general cleaning and tightening of
connections. Vacuum the control cabinets to eliminate dust
build-up. If the chiller control malfunctions, refer to the Trou-
bleshooting Guide section on page 47 for control checks and
adjustments.
Ensure power to the starter is isolated when cleaning and
tightening connections inside the starter enclosure. Failure
to disconnect power could result in electrocution.
44
NOTE: For first stage, rotate coupling clockwise to close
guide vanes; rotate coupling counterclockwise to open
guide vanes. For second stage, rotate coupling counter-
clockwise to close guide vanes; rotate coupling clockwise
to open guide vanes.

SCHEDULED MAINTENANCE


Run Times screen. These values should be reset
WARNING