Hanbell LBII-PLUS User manual

LBII-PLUS Technical Manual
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CONTENT
1. General ...................................................................................................................................................................... 3
1.1 Product Introduction...................................................................................................................................... 3
1.2 Nomenclature ................................................................................................................................................ 3
1.3 Product range................................................................................................................................................. 4
1.4 Design Specification ....................................................................................................................................... 4
1.5 Operation range ............................................................................................................................................. 5
1.6 Design Features.............................................................................................................................................. 6
2. Application................................................................................................................................................................. 7
2.1 Compressor application ................................................................................................................................. 7
2.2 Lubricant Application ..................................................................................................................................... 9
2.3 System application .......................................................................................................................................11
2.4 Motor control............................................................................................................................................... 21
2.5 Installation and fixation ............................................................................................................................... 24
3. Accessory................................................................................................................................................................. 26
3.1 Accessory list................................................................................................................................................ 26
3.2 Oil circuit parts............................................................................................................................................. 27
3.3 System parts................................................................................................................................................. 29
3.4 Electrical parts.............................................................................................................................................. 31
4. Maintenance............................................................................................................................................................38
4.1 Items to be checked before machine starting..............................................................................................38
4.2 Items to be checked during operation......................................................................................................... 38
4.3 Faults analysis ..............................................................................................................................................40
5. Appearance and functions.......................................................................................................................................42
5.1 Appearance structure ..................................................................................................................................42
5.2 LBII-100~410-PLUS Connector ................................................................................................................... 45
5.3 LBII-100~280-PLUS Dimension................................................................................................................... 46
5.4 LBII-100~280P-PLUS Dimension................................................................................................................. 47
5.5 LBII-360/410-PLUS Dimension ................................................................................................................... 48

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5.6 LBII-100~280-PLUS Dimension................................................................................................................... 49
5.7 LBII-100~280-P-PLUS Dimension................................................................................................................ 50
5.8 LBII-360/410-PLUS Dimension ................................................................................................................... 51

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1. General
1.1 Product Introduction
In recent years, Hanbell has launched LB, LB-PLUS series low temperature screw refrigeration compressor based
on the integrated application experience in low temperature field and customer demand. In order to further expand
the application field and reliability of products, LBII-PLUS series compressors are specially developed. LBII-PLUS
series compressors continue to use the automatic control function of LB-PLUS. On the premise of ensuring intelligent
application, LBII-PLUS series further optimize the motor cooling control logic and cooling structure, improve the
safety margin of LBII-PLUS, and further expand the operation range, so that LBII-PLUS can meet the application
requirements of air-cooled system. At the same time, it further improves the performance, so that LBII-PLUS can be
widely used in refrigeration, industrial process cooling, freeze-drying and other fields with sufficient competitiveness.
In general, LBII-PLUS is a new elite product of Hanbell in the of low temperature application field.
Compared with normal product, LBII-PLUS has different application modes; users must read the contents of
this manual carefully before using, installing, debugging and running. If you have any questions, please contact
Hanbell.
1.2 Nomenclature
LB II –XXX X –X –PLUS
2nd generation Displacement Motor Extra-code Upgraded model
Rated power: 380V/50Hz, if need other special voltage/frequency, please contact HANBELL.
The standard motor of LB-PLUS is PWS partial winding starting motor.
Single type——compressor with built-in oil separator, hereinafter referred to as "single type".
Parallel type——compressor without built-in oil separator, hereinafter referred to as "parallel type".
If the compressor belongs to single type, the extra-code is omitted.
When the compressor is applied for R22 refrigerant, the refrigerant code is omitted
Product Code 2950r/min(50HZ) Null: Standard motor Null: Single type
Unit: m3/h V: Converter motor P: Parallel type

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1.3 Product range
LBII-PLUS fixed frequency compressor
1.4 Design Specification
Table 1 Compressor Design Specification
Model
Compressor
Motor
Oil filling
volume
Oil heater
Strength
test
Weight
Displacement
50Hz m3/h
Rotation
50Hz r/min
Lubricant
Type
Start-up
Voltage(V)50Hz
Insulation
Protection
L
W
bar
Kg
LBII-100/ LBII-100-P
106
2950
Oil difference pressure supply
3 phase 2 pole squirrel-cage inductor motor
（frequency conversion motor optional）
Partial winding starting
380
Level F
PTC
+NTC
4.5
300
35
248/233
LBII-140/ LBII-140-P
139
7
290/275
LBII-180/ LBII-180-P
179
7.5
310/295
LBII-200/ LBII-200-P
198
10
440/420
LBII-230/ LBII-230-P
224
10
460/440
LBII-250/ LBII-250-P
257
10.5
464/446
LBII-280/ LBII-280-P
275
11
474/454
LBII-360-P
366
-
-
370
LBII-410-P
416
-
-
416
Remark: “-P”Type compressor without lubricant oil
Note: Please confirm the rated current of designed working condition according to the HANBELL model selection
program, and select the contactor, power line and fuse protection element according to the maximum operating
current value determined by the initial temperature / limit operation.
LBⅡ-100
LBⅡ-140
LBⅡ-180
LBⅡ-200
LBⅡ-230
LBⅡ-250
LBⅡ-280
LBⅡ-360
LBⅡ-410
106
139
179
198
224
257
275
366
416
0
50
100
150
200
250
300
350
400
450
m3/h

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1.5 Operation range

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1.6 Design Features
Electronic expansion valve
The LBII-PLUS adopts electronic expansion valve. Its precise control, stability in operation and
simplification control make compressors simpler, safer and more reliable.
Independent cooling of motor
It ensures that the motor runs at the ideal temperature, which effectively prolongs the life-time of
the motor. The harmful superheating of the suction refrigerant will no longer been increased. The
refrigerant after cooling the motor enters the compression chamber, so it will not cause the
cooling loss due to the cooling of motor, which achieves a higher energy efficiency ratio, especially
in the low temperature application.
Application design of single compressor and parallel connection
LBII-100~280-PLUS are divided into two structural forms: with oil separator and without oil
separator. LBII-360~410-PLUS have only one structure without oil separator. It can be applied to
various application fields, and different suction and discharge outlet directions can be selected.
The wiring part far away from the suction port to avoid affecting the electrical insulation
Compared with the normal low temperature screw compressor, the frosting phenomenon of the
electrical part is reduced, which improves the safety.
High efficiency multistage oil separator
Patented segmented high efficiency oil separator design ensures the lowest oil loss rate during the
compressor operation.
Optimization motor cooling
The motor cooling control logic of LBII is optimized and operation range is expanded to meet the
requirements of air-cooling applications.
Optimization of economizer connector
The connector of economizer is optimized, and the performance of LBII-PLUS with economizer is
improved compared with LB-PLUS.

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2. Application
2.1 Compressor applicationMotor cooling
The normal screw refrigeration compressor cool the motor through suction. When it works at low temperature
condition, the mass flow rate of refrigerant is very small. Refrigerant absorbs heat through the motor, resulting in a
lot of harmful superheat, which increases the specific volume of the refrigerant and leads to theloss of refrigerating
capacity.
The LBII-PLUS series compressor adopts independent motor cooling. The motor chamber and the compression
chamber are isolated, and only small amount of liquid refrigerant is used to cool the motor, which enables the motor
to work in the ideal temperature range. Meanwhile, it can prolong the life-time of motor. The gaseous refrigerant
after cooling the motor enters the compression chamber to avoid the refrigerating loss caused by the motor cooling.
The effect is particularly obvious at low temperature.
In order to effectively control the refrigerant quantity that enter into the motor chamber, HANBELL designed the
scheme to control the motor liquid injection:
Electronic expansion valve specially designed for LBII-PLUS
With electronic expansion valve to control the temperature of the motor is shown in the following Figure, the
solenoid valve and the compressor start or stop at the same time. The electronic expansion valve is controlled by
controller of LBII-PLUS. Through a special algorithm, the temperature of the motor is controlled at around 60℃.
The following are description of two types of injection points:
1)
The liquid taking point of the
motor liquid injection shall be
taken at the front and bottom
of the rising riser of main
liquid pipe
The main liquid pipe
is required to use
riser Piping after the
motor takes the liquid
point, so as to ensure
that when the system
is short of refrigerant,
there is still enough
liquid refrigerant to
cool the motor.
Motor
liquid
injection
E
C
O

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2)
Figure2-1 Electronic expansion valve installation diagram
It is forbidden to cut off the liquid injection of the motor during operation.
It is forbidden to turn on the liquid injection of the motor when the compressor stops.
The refrigerant extraction is introduced directly from the place after the dry filter of system, and the
extraction point must be before the economizer. The material of injection pipe shall be copper and
rubber pipe shall not be used.
Normally closed solenoid valve shall be used for the motor liquid injection.
The oil sight glass is used to confirm whether the refrigerant is full in pipe. It is strictly forbidden to run
the compressor when the pipe is not full with refrigerant or there are a lot of bubbles in pipe.
If there is insufficient refrigerant before start-up and commissioning, it is recommended to charge
refrigerant from the valve above the casing.
It is recommended that the high-pressure reservoir should be equipped with level switch to prevent
the leakage of fluorine after long-term operation of the system, resulting in insufficient cooling liquid
supply of motor and insufficient liquid supply of evaporator, resulting in overheating of motor and
discharge, and eventually leading to compressor failure.
It is recommended that the suction side and the motor side be insulated to avoid cooling loss.
Note: Compared with the compressor with normal suction cooling structure of motor, LBII-PLUS can improve the
motor cooling reliability while improving the energy efficiency after motor liquid injection in the above way. Even
if the system is short of fluorine, the low pressure is too low and the suction superheat is too high, the motor
cooling can still be effectively ensured. In this way, the user can have enough time to deal with the abnormal
warehouse temperature and fluorine deficiency in the system, while the compressor with normal motor cooling
structure will alarm or even fail before the user finds out the problem and handles it.
E
C
O
Motor
liquid
injection

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2.1.2 Oil line blocking pin
If an external oil cooler is required to a single type compressor, oil blocking pin needs to be installed in the
compressor. The function of the blocking pin is to block the oil internal cycle of the compressor, so as to realize the
establishment of external oil.
Figure2-1 Oil line blocking pin diagram
2.2Lubricant Application
2.2.1 Function of lubricant
The sealing oil film is formed between the rotors and the compression chamber and between the
male rotor and female rotor to reduce the leakage of the refrigerant gas from the high pressure side
to the low pressure side during the compression process.
The lubricant will absorb and take away the heat generated by the gas refrigerant during the
compression process and the heat generated by the mechanical movements among the bearings,
so as to ensure the long-term normal operation of the compressor and reduce the discharge
temperature.
To form the oil film among the bearings so as to ensure the operation of the bearing under normal
conditions.
Oil inlet
Oil line blocking pin
Oil outlet

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2.2.2 Specified lubricants for LBII-PLUS
Table-2 Lubricant specification
Refrigerant
R22
R404A/R507
Type
HBR-B03
HBR-B05
Proportion
1.01
0.957
Specific heat40 ℃（Kcal/kg K）
0.43
0.43
Note
HANBELL only acknowledge the specified lubricant as written in above table.
Minimum starting temperature of the lubricant: 20℃.
When the compressor stops, please open the oil heater (exclude long term stop).
Lubricating oil for other refrigerants can only be used after confirmation with Hanbell.
2.2.3 Requirements for use and replacement of lubricating oil
Before filling the lubricating oil, the system should be kept clean. After the initial operation of 2000 hours, it is
recommended to refill the lubricant once more to ensure the long-term operation of the compressor.
Lubricating oil is easy to absorb the moisture in the air, so it should be avoided to be exposed to the air.
In order to keep as minimum as possible water contained in the system, it is suggested that the system
needs to be heated and evacuated as long as possible when the lubricant is replaced.
The foreign matter in lubricating oil will cause the blockage of the oil circuit. Therefore, the oil filter must
be installed to the external oil circuit, and the pressure difference switch must be installed before and
after the filter. When the pressure difference value reaches the set point (1.5bar), the oil filter must be
replaced or cleaned.
If the compressor runs under high temperature working condition for a long time, it will accelerate the
deterioration of the lubricating oil. Please check the chemical performance of the lubricating oil regularly
and shorten the interval of oil exchange.
The acidification of lubricating oil will affect the life-time of motor. when the lubricating oil PH≤6, it should
be replaced. (Please replace the system dry filter at the same time to ensure the system is dry).
If the compressor motor is burned, it will produce acid harmful matter and debris, and they will be
brought into the system together. The inspection should be carried out. Oil filters and lubricants must be
changed many times until the cleanliness and acidity of the oil line reach the standard. The lubricating oil
status needs to be traced regularly. Please replace it if the cleanliness and acidity beyond the standard
range. Please pay attention to the cleanliness and dryness of the system as well.
Warning: If the lubricating oil that isn’t authorized by Hanbell is used for compressor, HANBELL
will not be responsible for the coming problems.