AE4-1312 R2
© 2010 Emerson Climate Technologies
Printed in the U.S.A.
10
Oil Dilution Chart
0
10
20
30
40
50
60
70
80
90
100
-10
0
10
20
30
40
50
Evaporating Temperature °F
Co
mpre
sso
r Su
mp
Temperat
ur
e
°F
Safe Area
OK. See Note 1
Unsafe Area. Too Much Refrigerant Dilution
200°F Maximum Oil Temperature
Figure 1
Figure 1
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.
Liquid
Level
Drainage
In Off
Cycle
Scroll
Accumulator
Figure 2
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.
