Specifications

98
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 recom-
mended level, temperature, and pressure. Inspect the
lubrication system regularly and thoroughly. Annual oil analy-
ses 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 and 5
compressor high speed shaft only) cannot be field inspected;
excessive vibration is the primary sign of wear or damage. If
either symptom appears, contact an experienced and responsi-
ble 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. In-
spect 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) indicates whether there
is water leakage during chiller operation. Water leaks should be
repaired immediately.
Water Treatment — Untreated or improperly treated wa-
ter may result in corrosion, scaling, erosion, or algae. The ser-
vices of a qualified water treatment specialist should be ob-
tained to develop and monitor a treatment program.
Inspect the Starting Equipment — Before working
on any starter, shut off the chiller, open and tag all disconnects
supplying power to the starter.
1
2
3
4
5
6
7
8
LEGEND
Fig. 50 — 19XR/XRV Float Valve Design
1—Refrigerant Inlet from FLASC Chamber
2—Linear Float Assembly
3—Float Screen
4—Bubbler Line
5—Float Cover
6—Bubbler Line Connection
7—Refrigerant Outlet to Cooler
8—Gasket
a23-1632
CAUTION
The chiller must be dehydrated after repair of water leaks
or damage may result. See Chiller Dehydration section,
page 69.
CAUTION
Water must be within design flow limits, clean, and treated
to ensure proper chiller performance and reduce the poten-
tial of tube damage due to corrosion, scaling, erosion, and
algae. Carrier assumes no responsibility for chiller damage
resulting from untreated or improperly treated water.
CAUTION
The motor leads must be disconnected from the VFD
before an insulation test is performed. The voltage gener-
ated from the tester can damage the VFD or drive
components.