User Guide
Table Of Contents
- Compressor model designation
- Danfoss scroll compression principle
- Features
- Technical specifications
- Dimensions
- Electrical data, connections and wiring
- Approval and certifications
- Operating conditions
- System design recommendations
- Specific application recommendations
- Sound and vibration management
- Installation
- Compressor handling and storage
- Compressor mounting
- Compressor holding charge
- System cleanliness
- Tubing
- Brazing and soldering
- System pressure test
- Leak detection
- Vacuum evacuation and moisture removal
- Filter driers
- Refrigerant charging
- Insulation resistance and dielectric strength
- Commissioning
- Oil level checking and top-up
- Ordering information & packaging
- Accessories
Application guidelines
27AB237986441643en-US0701
SM084 to 185
SY185 to 380
R22
Motor supply SM / SY / SZ scroll compressors can be operated
at nominal voltages as indicated on page 18.
Under-voltage and over-voltage operation is
allowed within the indicated voltage ranges. In
case of risk of under-voltage operation, special
attention must be paid to current draw.
The operating envelopes for SM / SY / SZ
scroll compressors are given in the gures
below, where the condensing and evaporating
temperatures represent the range for steady-
state operation. Under transient conditions, such
as start-up and defrost, the compressor may
operate outside this envelope for short periods.
The gures below show the operating envelopes
for refrigerants R22, R407C, R134a, R404A, R507
and R513A.
The operating limits serve to dene the
envelope within which reliable operations of the
compressor are guaranteed:
• Maximum discharge gas temperature: 275°F
• A suction superheat below 9°F (18°F for R407C)
is not recommended due to the risk of liquid
ood back
• Maximum superheat of 54°F
• Minimum and maximum evaporating and
condensing temperatures as per the operating
envelopes.
SM / SY / SZ compressors can be applied
from -31°F to 145.4°F (for SM/SZ084 to 185)
and 127.4°F (for SY/SZ 240 to 380) ambient
temperature. The compressors are designed
as 100 % suction gas cooled without need for
additional fan cooling. Ambient temperature has
very little eect on the compressor performance.
In case of enclosed tting and high ambient
temperature it’s recommend to check the
temperature of power wires and conformity to
their insulation specication.
In case of safe tripping by the compressor
overload protection the compressor must cool
down to about 140°F before the overload will
reset. A high ambient temperature can strongly
delay this cool-down process.
Although the compressor itself can withstand
low ambient temperature, the system may
require specic design features to ensure safe
and reliable operation. See section ‘Specic
application recommendations’.
Application envelope at dew
temperatures
Compressor ambient
temperature
High ambient temperature
Low ambient temperature
80
90
100
110
120
130
140
150
160
-10 0 10 20 30 40 50 60
Condensing temperature (°F)
Evaporating temperature (°F)
S.H. = 54°F SUPERHEAT
S.H. = 20°F
S.H. = 9°F
Operating conditions