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LT-S (-L) series semi-hermetic screw refrigeration compressor

The minimum saturated suction temperature of the conventional single stage screw compressor is -40~-50 °C. If you want evaporate temperature at -60~-65°Cyou need multi unit of single stage compressors. Meanwhile, the high pressure ratio working condition brings problems such as excessive leakage and high discharge temperature during compression, which results in low reliability and low efficiency for the single-stage compressor operating in such harsh conditions.

While the compound two-stage compressor well solves above problems. Compared to the two-stage compressors and multi unit of single stage compressors, the compound two-stage compressors occupy less space and the system is easy to control, so it's more efficiency and reliable.

For above reasons, Shanghai Hanbell Precise Machinery Co., Ltd. specialized in the development of LT series two-stage screw refrigeration compressors which is composed of two types: the semi-hermetic type (-S) and open type (-G). They can be used in the field of low temperature refrigeration and high temperature heat pump according to the application. High efficiency and reliability under big pressure difference and compression ratio working condition is the main demand in design. It is a product of elite which accumulates Shanghai Hanbell's rich technology and extensive application experience. LT can be widely used in low temperature frozen products, frozen tunnels, freezers, process cooling, pharmaceutical biochemistry, high temperature hot water, central heating and many other industries.


Features
Model Specification
Catalogue & Technical Manual
Drawing

Starting load

Light starting load designstarting load is equivalent to ordinary single-stage compressor, avoiding greater impact on the power grid

 

Motor cooling channel

The excellent motor cooling flow channel design ensures reliable cooling of the motor and high efficiency of the compressor, so that the compressor can operate in a very wide range and more adaptable.

 

Motor temperature visualization

Motor embedded temperature sensor; NTC, which can directly read motor temperature for motor temperature control and protection

 

System component integration design

Equipped with medium pressure check valve, shut-off valve and economizer filter, it makes the protection system of the compressor reliable and simplifies customer system configuration

 

Junction box never frosts

The junction box of the LT compressor is arranged in the middle temperature zone, even if it is operated at -65 °C for a long time, there will be no frosting.

 

Simple system control

Logical control is simpler and reduces control costs.

 

Wider range of applications

Compared to the LT-S Series, the LT-S-L Series have a wider operating range and can meet the needs of unfrozen freezer, quick-freezing tunnels and industrial refrigeration applications.


Model

Compressor


Low pressure

High pressure

Rotation

speed

50Hz

r/min

Capacity control

Lubrication method

Noise


Displacement

Displacement


Low temperature freezing

LT-S

Refrigerated + quick frozen

LT-S-L


50Hz

50Hz


m3/h

m3/h

Step

Stepless

dB


LT-20/10

224

99

2950

10%/50%
  100%

10%
  ~
  100%

Pressure differential oil supply

80

81


LT-30/12

316

137

81

/


LT-45/20

450

207

83

84


LT-55/25

551

257

84

85


LT-65/32

651

313

10%/50%
  75%/100%

86

88


LT-83/41

840

396

87

89


Model

Quality

Motor

Strength test


Type

Starting type

Voltage
  (V)
  50Hz

Insulation grade

Protection


Kg

bar


Low temperature freezing

LT-S

Refrigerated + quick frozen

LT-S-L

Low temperature freezing

LT-S

Refrigerated + quick frozen

LT-S-L


LT-20/10

598

620

3-phase 2-pole induction Squirrel-Cage Motor

star-delta starter

380

F Level

PTC+
  PT100

(NTC Optional)

35


LT-30/12

620

/


LT-45/20

1158

1200


LT-55/25

1195

1230


LT-65/32

1395

1450


LT-83/41

1430

1490