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200°F Maximum Oil Temperature
100
90
80
70
60
50
40
30
20
10
0
-10
Note 1: Operation in this refrigerant dilution area is safe in air to air heat pump heating mode. For
other applications, such as AC only, review expansion device to raise superheat. A cold sump may
result in high refrigerant migration after shut down.
To prevent flooded start damage on 3 phase scrolls due to off cycle migration, the accumulator may be
configured on some systems to allow free drainage from the compressor to the accumulator during the
off cycle. When the above configuration is not possible and the unit charge is over the charge limit shown
in Table 5, a crankcase heater is required.
© 2010 Emerson Climate Technologies
Printed in the U.S.A.
Oil Dilution Chart
Safe Area
0
10
Evaporating Temperature °F
Liquid
Level
Drainage
In Off
Cycle
Scroll
Unsafe Area. Too Much Refrigerant Dilution
20
30
Figure 1
Figure 1
Accumulator
Figure 2
10
AE4-1312 R2
OK. See Note 1
40
50
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