Datasheet Content
Application guidelines
Danfoss scroll compressors
SH090 to SH485 - single
50 Hz - 60 Hz - R410A
http://cc.danfoss.com
Application Guidelines Content
Scroll compression principle. .................. 4 System design recommendations......... 27
General. ...................................................................... 27
Features..................................................... 5 Essential piping design recommendations. . 27
Compressor model designation.............. 6 Refrigerant charge limit. ...................................... 28
Nomenclature.............................................................6 Off-cycle migration................................................ 29
Liquid flood back.....................................................31
Technical specifications. .......................... 7
50-60 Hz data..............................................................7 Specific application recommendations.32
Low ambient application..................................... 32
Dimensions................................................ 8 Low load operation. .............................................. 33
SH090-105-120-140* and 161* . ............................8 Brazed plate heat exchangers. .......................... 33
SH 140 and 161 code 3 and SH184. .....................9 Electronic expansion valve. ................................ 33
SH180-240-295..........................................................10 Reversible heat pump systems. ........................ 33
SH380-485 (Except code 3)................................. 11 Water utilizing systems. ....................................... 35
SH380 code 3. ...........................................................12
Sound and vibration management....... 36
Electrical data, connections and wiring.13 Starting sound level. ............................................. 36
Connection details..................................................13 Running sound level. ............................................ 36
Motor voltage. ..........................................................14 Stopping sound level............................................ 36
Wiring connections. ...............................................14
IP rating. ......................................................................15 Installation. ............................................. 38
Terminal box temperature. ..................................15 Compressor handling and storage. ................. 38
Three phase electrical characteristics..............16 Compressor mounting. ........................................ 38
Danfoss MCI soft-start controller.......................17 Compressor holding charge............................... 39
General wiring information. ................................18 System cleanliness. ................................................ 40
Motor protection.................................................... 20 Tubing......................................................................... 40
Voltage imbalance. .................................................21 Brazing and soldering........................................... 40
System pressure test. .............................................41
Approval and certifications. .................. 22 Leak detection..........................................................42
Approvals and certificates................................... 22 Vacuum evacuation and moisture removal. .42
Pressure equipment directive 2014/68/EU. .. 22 Filter driers. ................................................................42
Low voltage directive 2014/35/EU. .................. 22 Refrigerant charging. ............................................ 43
Machines directive 2006/42/EC......................... 22 Insulation resistance and dielectric strength.43
Internal free volume.............................................. 22 Commissioning. ...................................................... 43
Oil level checking and top-up. .......................... 43
Operating conditions. ............................ 23
Refrigerant and lubricants. ................................. 23 Ordering information and packaging. . 44
Motor supply............................................................ 24 Packaging.................................................................. 44
Compressor ambient temperature.................. 24 Ordering information............................................ 45
Application envelope............................................ 24
Discharge temperature protection ................. 25 Accessories. ............................................. 47
High and low pressure protection. .................. 25
Cycle rate limit. ........................................................ 26
AB243586442172en-001401 3
Application Guidelines Scroll compression principle
In a Danfoss SH scroll compressor, the
compression is performed by two scroll elements
located in the upper part of the compressor.
Suction gas enters the compressor at the suction
connection. As all of the gas flows around and
through the electrical motor, thus ensuring
complete motor cooling in all applications, oil
droplets separate and fall into the oil sump.
After exiting the electrical motor, the gas enters
the scroll elements where compression takes
place. Ultimately, the discharge gas leaves the
compressor at the discharge connection.
The figure below illustrates the entire
compression process. The centre of the orbiting
scroll (in grey) traces a circular path around
the centre of the fixed scroll (in black). This
movement creates symmetrical compression
pockets between the two scroll elements.
Low-pressure suction gas is trapped within
each crescent-shaped pocket as it gets formed;
continuous motion of the orbiting scroll serves
to seal the pocket, which decreases in volume
as the pocket moves towards the centre of the
scroll set increasing the gas pressure. Maximum
compression is achieved once a pocket reaches
the centre where the discharge port is located;
this stage occurs after three complete orbits.
Compression is a continuous process: the
scroll movement is suction, compression and
discharge all at the same time.
SUCTION
COMPRESSION
DISCHARGE
4 AB243586442172en-001401
Application Guidelines Features
SH range is composed of SH090-105-120-140- • Gas intake design induces higher resistance to
161-184 (light commercial platform) and SH180- liquid slugging.
240-295-380-485 (large commercial platform).
The SH485 compressors include additional
The SH090-105-120-140-161-184 compressors features for enhanced protection and efficiency:
benefit from a further improved design to • integrated discharge gas temperature
achieve the highest efficiency. protection,
• intermediate discharge valves for higher
• Gas circulation, motor cooling and oil seasonal efficiency.
behaviour are improved on…
