Emerson Copeland Scroll ZR KA Series - Page 10

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
-100 10 20 30 40 50
Evaporating Temperature °F
Compressor Sump Temperatur
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 ooded start damage on 3 phase scrolls due to off cycle migration, the accumulator may be
congured on some systems to allow free drainage from the compressor to the accumulator during the
off cycle. When the above conguration is not possible and the unit charge is over the charge limit shown
in Table 5, a crankcase heater is required.