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pleted when upgrading or changing the type of lubri-
cant.
1. Thoroughly drain system:
– Drain oil from air end and cooler while hot.
– Break low point connections and drain oil
from pipe runs.
– Dump oil from the filter and reinstall used fil-
ter.
2. Fill the system with a 50 percent charge of the new
lubricant:
– Start the machine and stay there to observe.
– Allow the machine to run about five minutes
at temperature, or until temperature stabi-
lizes, then shut down.
3. Thoroughly drain the machine.
4. Change to a new filter and separator.
5. Fill the system with a full charge of the new lubri-
cant, then reinstall drain plug.
6. Machine should then be run normally, however,
total run time after the initial changeout should be
50 percent of normal anticipated service life of the
new lubricant.
– Drain all lubricant from the system, change
the filter and separator, and replace with a full
charge of the new lubricant.
7. Subsequent lubricant changeouts should be at
normal intervals. (See “Oil Change Interval” and
chart below.)
OIL LEVEL GAUGE (FIGURE 1–6, page 3, and
FIGURE 5–4) indicates the amount of oil in the oil res-
ervoir. Read oil level only when unit is on. In operation
the oil level will fluctuate as the compressor loads and
unloads. Add oil only when the oil is at the bottom of
the red range on the gauge as read when the compres-
sor is on. Drain oil only when the oil level is above the
FIGURE 5–4 – OIL LEVEL GAUGE
center of the green range on the gauge as read when
the compressor is on.
MOISTURE IN THE OIL SYSTEM – In normal humid-
ity and with normal operating temperatures and pres-
sures, the thermal mixing valve controls the oil temper-
ature and prevents moisture contamination of the oil.
Unusual cooling of the oil reservoir, short loaded cycle
in high humidity or malfunctions of the thermal valve
may result in moisture in the oil system which is detri-
mental to compressor lubrication and could cause oil
carryover. If moisture is observed in the oil reservoir,
drain the moisture and correct the condition causing
the accumulation. See “Compressor Oil System
Check,” page 44 and “Thermal Control (Thermostatic
Mixing) Valve,” page 40.
OIL CHANGE INTERVAL – Recommended oil change
intervals are based on oil temperature. FIGURE 5–5,
shows how the change interval is affected by tempera-
ture.
FIGURE 5–5 – OIL CHANGE INTERVAL
Discharge AEON 4000 AEON 9000 SP
Temperature Change Interval Change Interval
Up to 180_F (82_C) 4000 hrs. 8000 hrs.
180_ to 190_F (82_ to 88_C) 3000 hrs. 6000 hrs.
190_ to 200_F (88_ to 93_C) 2000 hrs. 4000 hrs.
200_F+ (93_C) 1000 hrs. 2000 hrs.
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