System Maintenance - Daikin Pathfinder AWV Installation, Operation And Maintenance Manual

General
On initial startup and periodically during operation, it will
be necessary to perform certain routine service checks.
Among these are checking the liquid line sight glasses, and
the compressor oil level sight glass. In addition, check the
MicroTech III controller temperature and pressure readings
®
with gauges and thermometers to see that the unit has normal
condensing/suction pressure and superheat/subcooling
readings. Initial startup date, vibration readings, and oil
analysis information should be kept for reference baseline
data.
If the service technician has determined that the refrigerant
charge has been contaminated, the charge should be
recovered and tested for contaminates or noncondensables.
Appropriate actions should be taken based on testing and
Clean Air Act regulations.
Vibration Monitoring (Optional)
Vibration readings are often used as an indicator of a possible
problem requiring maintenance. If vibration monitoring is part
of the site PM program, the compressor can be checked with a
vibration analyzer on an annual basis. When doing the annual
testing, the load should be maintained as closely as possible
to the load of the original test. The initial vibration analysis test
provides a benchmark of the compressor, and when performed
routinely, can give a warning of impending problems.
Lubrication
The fan motor bearings are permanently lubricated. No further
lubrication is required. Excessive fan motor bearing noise is an
indication of a potential bearing failure.
POE type oil is used for compressor lubrication. This type of
oil is extremely hygroscopic, which means it will quickly absorb
moisture if exposed to air and form acids that can be harmful
to the chiller. Avoid prolonged exposure of refrigerant to the
atmosphere to prevent this problem.
POE oil must be handled carefully using proper protective
equipment (gloves, eye protection, etc.). The oil must not
come into contact with certain polymers (e.g. PVC) as it may
absorb moisture from this material. Also, do not use oil or
refrigerant additives to the system.
WARNING
Polyolester Oil, commonly known as POE oil is a synthetic
oil used in many refrigeration systems, and is present in this
Daikin product. POE oil, if ever in contact with PVC/CPVC, will
coat the inside wall of PVC/CPVC pipe causing environmental
stress fractures. Although there is no PVC/CPVC piping in
this product, please keep this in mind when selecting piping
materials for your application, as system failure and property
damage could result. Refer to the pipe manufacturer's
recommendations to determine suitable applications of the
pipe.
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CAUTION
It is important that only the manufacturer's recommended oil be
used. Acceptable POE oil types are:
• CPI/Lubrizol Emkarate RL68H
• Exxon/Mobil EAL Arctic 68
• Hatcol 3693
The compressor oil heater is 250 watts and is on when the
compressor is off and off when the compressor is on.
Table 61: Oil Charge per Compressor
Compressor Designation
3120, 3122
3AL, 3BL
4AL
Oil Filter Removal and Renewal
Prior to this procedure, pump out the compressor. Isolate the
electrical supply to the control panels and compressor motor
terminal. Filter should be changed when pressure drop delta
goes above the linear line in
Figure 89: Pressure Drop to Change Oil Filter
100
90
80
70
60
50
40
30
20
10
0
0 50
Operating Pressure Difference = Condenser Pressure - Evaporator Pressure (PSIG)
Figure 90: Oil Filter Location (Including Cutaway View)
91 IOM 1242-8 • PATHFINDER

System Maintenance

Oil Quantity (gallons)
3.43
4.7
6.6
Figure 89.
y = 0.3846x + 10.596
Recommended Filter
Delta P Change
Linear (Oil Filter
Pressure Drop)
100 150 200 250
MODEL AWV CHILLERS
®
System Maintenance