Technical data

9
AE-1318 R1
© 2008 Emerson Climate Technologies
Printed in the U.S.A.
Application Engineering
BULLETIN
No time delay is required on three phase models to
prevent reverse rotation due to brief power
interruptions.
Deep Vacuum Operation
WARNING: Do not run a Copeland Scroll
refrigeration compressor in a deep vacuum. Failure
to heed this advice can result in arcing of the Fusite
pins and permanent damage to the compressor.
A low pressure control is required for protection against
deep vacuum operation. See Pressure Control section
for proper set points.
Scroll compressors (as with any refrigerant compressor)
should never be used to evacuate a refrigeration or air
conditioning system. See Application Engineering
Bulleting AE 24-1105 for proper system evacuation
procedures.
Unbrazing System Components
If the refrigerant charge is removed from a scroll unit
by bleeding the high side only, it is sometimes possible
for the scrolls to seal, preventing pressure equalization
through the compressor. This may leave the low side
shell and suction line tubing pressurized. If a brazing
torch is then applied to the low side, the pressurized
refrigerant and oil mixture could ignite as it escapes
and contacts the brazing fl ame. It is important to check
both the high and low sides with manifold gauges
before unbrazing or in the case of assembly line repair,
remove refrigerant from both the high and low sides.
Instructions should be provided in appropriate product
literature and assembly (line repair) areas.
Hi-Pot Testing
Copeland Scroll compressors are confi gured with
the motor in the bottom of the shell. Unlike most
other hermetic compressors, the scroll motor can be
immersed in refrigerant when liquid is present in the
shell. Hi-Pot test with liquid refrigerant in the shell can
show higher levels of current leakage due to higher
electrical conductivity of liquid refrigerant vs. refrigerant
vapor and oil. This phenomenon can occur with any
compressor when the motor is immersed in refrigerant
and does not present any safety issue. To lower the
current leakage reading operate the system for a brief
period of time, redistributing the refrigerant in a more
normal confi guration and test again.
Note: The solid state electronic module
components and internal sensors are delicate
and can be damaged by exposure to high voltage.
Under no circumstances should a high potential
test be made at the sensor terminals or sensor
leads connected to the module. Damage to the
sensors or module may result.