97
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.
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.
Excessive bearing wear can sometimes be detected through
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
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 —
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.
Higher than normal condenser pressures, together with the
inability to reach full refrigeration load, usually indicate dirty
tubes or air in the chiller. If the refrigeration log indicates a rise
above normal condenser pressures, check the condenser refrig-
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-
erant, air usually does not enter the chiller.
During the tube cleaning process, use brushes specially de-
signed to avoid scraping and scratching the tube wall. Contact
your Carrier representative to obtain these brushes. Do not use
wire brushes.
Hard scale may require chemical treatment for its preven-
tion or removal. Consult a water treatment specialist for proper
treatment.
Water Leaks —
The refrigerant moisture indicator on the
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 —
Untreated or improperly treated
water may result in corrosion, scaling, erosion, or algae. The
2
3
1
LEGEND
Fig. 51 — Economizer Float System
(Two-Stage Compressor Chiller)
1
— Float Ball
2
— Refrigerant Exit
3
— Bearings
SPRING
HOUSING
CONNECTION
TO COOLER
O-RING
ECONOMIZER
SIDE
COMPRESSOR
SIDE
VALVE
PACKING
Fig. 52 — Economizer Damper Valve
(Two-Stage Compressor Chiller)
CAUTION
The chiller must be dehydrated after repair of water leaks
or damage may result. See Chiller Dehydration section,
Summary of Contents for AquaEdge 19XR series
Page 69: ...69 Fig 33 19XR Leak Test Procedures a19 1625 ...
Page 154: ...154 Fig 64 Benshaw Inc Wye Delta Unit Mounted Starter Wiring Schematic Low Voltage a19 1873 ...
Page 161: ...161 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v ...
Page 162: ...162 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v cont ...
Page 186: ...186 APPENDIX B LEAD LAG WIRING 19XR Lead Lag Schematic Series Cooler Flow a19 1655 ...
Page 187: ...187 APPENDIX B LEAD LAG WIRING cont 19XR Lead Lag Schematic Parallel Cooler Flow a19 1717 ...