Maintenance - Carrier AquaEdge 19XR series Start-Up, Operation And Maintenance Instructions Manual

As a minimum, the following maintenance is required.
1. At least once a year, disconnect the vent piping at the
valve outlet and carefully inspect the valve body and
mechanism for any evidence of internal corrosion or rust,
dirt, scale, leakage, etc.
2. If corrosion or foreign material is found, do not attempt to
repair or recondition. Replace the valve.
3. If the chiller is installed in a corrosive atmosphere or the
relief valves are vented into a corrosive atmosphere, in-
spect the relief valves at more frequent intervals.
2
LEGEND
1 — Float Ball
2 — Refrigerant Exit
3 — Bearings
Fig. 51 — Economizer Float System
(Two-Stage Compressor Chiller)
VALVE
PACKING
COMPRESSOR
SIDE
Fig. 52 — Economizer Damper Valve
(Two-Stage Compressor Chiller)
Compressor Bearing and Gear Maintenance —
The key to good bearing and gear maintenance is proper lubri-
cation. Use the proper grade of oil, maintained at
recommended level, temperature, and pressure. Inspect the
lubrication system regularly and thoroughly. Annual oil analy-
ses and vibration measurements are recommended.
increased vibration or increased bearing temperature. Gears,
babbitted journal, and thrust bearings should be examined for
signs of wear based on the results of the annual oil analysis and
vibration levels. To inspect the bearings, a complete compres-
sor teardown is required. Only a trained service technician
should remove and examine the bearings. The frequency of ex-
amination is determined by the hours of chiller operation, load
conditions during operation, and the condition of the oil and the
lubrication system. Rolling element bearings (Frame 3, 4, 5
and E compressor high speed shaft only) cannot be field in-
spected; excessive vibration is the primary sign of wear or
damage. If either symptom appears, contact an experienced
and responsible service organization for assistance.
Inspect the Heat Exchanger Tubes and Flow
Devices
COOLER AND OPTIONAL FLOW DEVICES — Inspect
and clean the cooler tubes at the end of the first operating sea-
son. Because these tubes have internal ridges, a rotary-type
tube cleaning system is needed to fully clean the tubes. Inspect
the tubes' condition to determine the scheduled frequency for
future cleaning and to determine whether water treatment in the
1
chilled water/brine circuit is adequate. Inspect the entering and
leaving chilled water temperature sensors and flow devices for
signs of corrosion or scale. Replace a sensor or Schrader fitting
if corroded or remove any scale if found.
CONDENSER AND OPTIONAL FLOW DEVICES —
3
Since this water circuit is usually an open-type system, the
tubes may be subject to contamination and scale. Clean the
condenser tubes with a rotary tube cleaning system at least
once per year and more often if the water is contaminated.
Inspect the entering and leaving condenser water sensors and
flow devices for signs of corrosion or scale. Replace the sensor
or Schrader fitting if corroded or remove any scale if found.
inability to reach full refrigeration load, usually indicate dirty
tubes or air in the chiller. If the refrigeration log indicates a rise
SPRING
above normal condenser pressures, check the condenser refrig-
HOUSING
erant temperature against the leaving condenser water tempera-
ture. If this reading is more than what the design difference is
supposed to be, the condenser tubes may be dirty or water flow
may be incorrect. Because HFC-134a is a high-pressure refrig-
CONNECTION
erant, air usually does not enter the chiller.
TO COOLER
signed to avoid scraping and scratching the tube wall. Contact
your Carrier representative to obtain these brushes. Do not use
O-RING
wire brushes.
tion or removal. Consult a water treatment specialist for proper
ECONOMIZER
treatment.
SIDE
Water Leaks —
refrigerant motor cooling line (Fig. 2 and 3) indicates whether
there is water leakage during chiller operation. Water leaks
should be repaired immediately.
Water Treatment —
water may result in corrosion, scaling, erosion, or algae. The
97
Excessive bearing wear can sometimes be detected through
Higher than normal condenser pressures, together with the
During the tube cleaning process, use brushes specially de-
Hard scale may require chemical treatment for its preven-
The refrigerant moisture indicator on the
CAUTION
The chiller must be dehydrated after repair of water leaks
or damage may result. See Chiller Dehydration section,
page 71.
Untreated or improperly treated