Inspect Relief Valves And Piping; Compressor Bearing And Gear Maintenance; Inspect The Heat Exchanger Tubes And; Flow Devices - Carrier AquaEdge 19XR Start-Up, Operation And Maintenance Instructions Manual

VALVE
PACKING
COMPRESSOR
SIDE
NOTE: Two Stage 19XR6-7 utilizes an electrical actuated butterfly valve as
damper valve.
Fig. 46 — Economizer Damper Valve (Two-Stage
19XRC, E Compressor Chiller)

Inspect Relief Valves and Piping

The relief valves on this chiller protect the system against the po-
tentially dangerous effects of overpressure. To ensure against
damage to the equipment and possible injury to personnel, these
devices must be kept in peak operating condition.
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,
inspect 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 recommend-
ed level, temperature, and pressure. Inspect the lubrication sys-
tem regularly and thoroughly. Annual oil analysis and vibration
measurements are recommended.
Excessive bearing wear can sometimes be detected through in-
creased vibration or increased bearing temperature. Gears, bab-
bitted journal bearings, 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 com-
pressor 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. High speed shaft rolling element bearings
cannot be field inspected; excessive vibration is the primary sign
of wear or damage. If either symptom appears, contact an expe-
rienced and responsible service organization for assistance.

Inspect the Heat Exchanger Tubes and

Flow Devices

SPRING
HOUSING COOLER AND OPTIONAL FLOW DEVICES
Inspect and clean the cooler tubes at the end of the first operat-
ing season. Confirm that there is no foreign debris from the
system that could have lodged in the tubes potentially resulting
CONNECTION
in tube failure. Because these tubes have internal ridges, a rota-
TO COOLER
ry-type tube cleaning system is needed to fully clean the tubes.
Inspect the tubes' condition to determine the scheduled fre-
quency for future cleaning and to determine whether water
O-RING
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.
ECONOMIZER
SIDE
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. Confirm that there is no
foreign debris from the system that could have lodged in the tubes
potentially resulting in tube failure. Inspect the entering and leav-
ing condenser water sensors and flow devices for signs of corro-
sion or scale. Replace the sensor or Schrader fitting if corroded or
remove any scale if found.
Higher than normal condenser pressures, together with the in-
ability 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 prevention or re-
moval. Consult a water treatment specialist for proper treatment.

Water Leaks

The refrigerant moisture indicator on the refrigerant motor cooling
line (Fig. 3-5) indicates whether there is water leakage during
chiller operation. Water leaks should be repaired immediately.
The chiller must be dehydrated after repair of water leaks or
damage may result. See Chiller Dehydration section, page 25.

Water Treatment

Untreated or improperly treated water may result in corrosion,
scaling, erosion, or algae. The services of a qualified water
treatment specialist should be obtained to develop and monitor
a treatment program.
Water must be within design flow limits, clean, and treated to
ensure proper chiller performance and reduce the potential of
tube damage due to corrosion, scaling, erosion, and algae.
Carrier assumes no responsibility for chiller damage result-
ing from untreated or improperly treated water.
49
CAUTION
CAUTION