Application Engineering
B U L L E T I N
AE4-1374 R1
Liquid
Level
Drainage
In Off
Cycle
Scroll
Accumulator
To prevent flooded start damage 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.
Figure 2
Accumulator Piping
Line Voltage
Fuse
A
B
Typical Solid State Timer
(if used)
Discharge Line
System Operating
Thermostat
Time Delay Relay Specifications
Timer Opens: 1 Electrical Cycle
Thermostat (if used) Compressor Contactor
C
Other Protective
Devices (if used)
Timer Closes: Greater than 5 seconds later, whether
(.016 Sec. With 60 HZ Operation)
power is restored or not
after power is removed
Figure 3
Time Delay Wiring
© 2013 Emerson Climate Technologies, Inc.
16
Printed in the U.S.A.
