Hanbell RC2-AV Series User manual

Contents
1. General........................................................................................................................................ 1
2. Specifications and description of design................................................................................. 2
2.1 Compressor nomenclature............................................................................................... 2
2.2 Compressor specifications .............................................................................................. 3
2.3 RC2-AV series compressor construction........................................................................ 4
2.4 Design features.................................................................................................................. 6
2.5 Compression process....................................................................................................... 7
2.6 Guide to VFD application.................................................................................................. 7
2.7 Capacity control system................................................................................................... 8
2.8 Compressor volume ratio (Vi) .......................................................................................... 8
2.9 Application limits............................................................................................................... 9
3. Lubricants................................................................................................................................. 10
3.1 Lubricants table............................................................................................................... 10
3.2 Pre-cautions of oil change.............................................................................................. 10
3.3 Oil change........................................................................................................................ 11
4. Compressor lifting and installation......................................................................................... 12
4.1 Compressor lifting........................................................................................................... 12
4.2 Mounting the compressor .............................................................................................. 12
4.3 RC2-AV series compressor outline drawings............................................................... 14
4.4 Compressors accessories.............................................................................................. 37
5. Electrical data and design ....................................................................................................... 50
5.1 Motor design.................................................................................................................... 50
5.2 Electrical installation with VFD ...................................................................................... 50
5.3 V-F diagram...................................................................................................................... 50
5.4 Compressor protection devices..................................................................................... 51
5.5 Grounding........................................................................................................................ 51
6. Operation and maintenance .................................................................................................... 52
6.1 Compressor start-up....................................................................................................... 52
6.2 Troubleshooting.............................................................................................................. 53
7. Applications.............................................................................................................................. 55
7.1 Additional cooling........................................................................................................... 55
7.2 Economizer applications................................................................................................ 58
7.3 Parallel system applications .......................................................................................... 60
7.4 Oil pump applications..................................................................................................... 60
7.5 Important notes about applications of compressor..................................................... 61

1
1. General
HANBELL RC2-AV series semi-hermetic screw compressor is developed especially for applications with variable
frequency drive, VFD (frequency inverter) in air-conditioning and refrigeration. It inherits merits of RC2 series
compressor in its basic design but is upgraded in its mechanism of capacity modulation as well as its dedicated design
of motor for VFD applications. Each HANBELL compressor has the latest and advanced 5-to-6 Patented Screw Rotor
Profile designed to ensure high capacity and efficiency in all operating conditions. Each unit is carefully manufactured
and inspected by high precision THREAD SCREW ROTOR GRINDING MACHINE, CNC MACHINING CENTER, and
3D COORDINATE MEASURING MACHINE. Each HANBELL compressor follows ISO 9001 quality system. This
certification assures that its quality is controlled under severe quality procedures and good service to all customers.
RC2-AV series compressor is equipped with liquid injection, economizer connection, PTC motor temperature
thermistors, discharge temperature thermistors and a motor protector for additional cooling and basic protection; other
accessories such as oil level switch and oil pressure differential switch are also available for advanced protection. The
complete accessories and their new designs guarantee the compressor has the best reliability, longest bearing life
during heavy duty running and strict operating conditions.
This Technical Manual contains information about lifting, dimensions, installation, operation, applications and basic
trouble-shooting. It is strongly recommended that relevant personnel read this manual carefully before lifting, installation,
and commissioning of RC2-AV series compressor in order to prevent any accident or damage. Please contact
HANBELL or its local distributors/agents for more information or further assistance.

2
2. Specifications and description of design
2.1 Compressor nomenclature
RC 2 – x x x x A V
Vfor applications with variable frequency driver)
Refrigerant Code A= R134a, R1234ze
Compressor Displacement at 50Hz (m
3
/hr)
RC model 2
nd
Version

3
2.2 Compressor specifications
RC2-AV
MODEL
COMPRESSOR MOTOR Lubricant
charge
Oil
Heater
Hydrostatic
Pressure
Test WEIGHT
Displacement
50Hz(m3/hr)
Rated
Speed
(rpm) VI
Type
Nominal
(Hp) Starting
Voltage
(V) Insulation
Protection
L W Kg/cm2G kg
RC2-100AV 98 1750~4750
2.2
2.6
3.0
3.5
4.8
3 Phase, 2 Pole, Squirrel Cage, Induction Motor
30 19
△
△△
△start
380~460 Class F PTC
7
150/300 42
275
RC2-140AV 137 1750~4750 42 26 7 280
RC2-180AV 180 1750~4750 56 35 7 300
RC2-200AV 193 1750~4750 59 37 8 420
RC2-230AV 230 1750~4750 70 44 14 540
RC2-260AV 257 1750~4750 78 49 14 545
RC2-300AV 293 1750~4750 90 56 16 590
RC2-310AV 308 1750~3550 71 59 16 575
RC2-340AV 339 1750~4750 102 64 16 600
RC2-370AV 366 1750~3550 84 70 16 610
RC2-410AV 407 1750~4750 125 78 16 730
RC2-430AV 423 1750~4750 125 78 16 735
RC2-470AV 471 1750~4750 144 90 18 800
RC2-510AV 508 1750~3550 117 98 20 760
RC2-550AV 549 1750~4750 168 105 23 820
RC2-580AV 583 1750~3550 131 109 20 805
RC2-620AV 619 1750~4750 182 114 23 850
RC2-710AV 713 1750~3550 158 131 28 1099
RC2-790AV 791 1750~3550 175 146 28 1140
RC2-830AV 825 1750~3550 183 152 28 1150
RC2-930AV 929 1750~3550 212 176 28 1180
RC2-1020AV 1017 1750~3550 227 189 40 1500
RC2-1130AV 1122 1750~3550 248 206 40 1520
RC2-1270AV 1268 1750~3550 286 238 53 2100
RC2-1530AV 1539 1750~3550 331 275 53 2200
Nominal horse power:
All the above Nominal Hp values are not the maximum compressor Hp. Please refer to Hanbell selection software for
rated current according to various operating conditions while sizing inverter, AC reactor, contactor, cable, fuse and
wirings, etc…

4
2.3 RC2-AV series compressor construction
RC2-100AV, RC2-140AV, RC2-180AV construction
Figure 1
Item
Description
Item
Description
Item
Description
Item
Description
1 Compressor casing 8 Oil separator muffler 15 Vi plug key 22 Oil filler cartridge
2 Motor casing 9 Oil separator demister 16 Discharge bearings 23 Suction filter
3 Oil separator 10 Power bolt 17 Discharge bearing fixed ring 24 Oil heater
4 Motor rotor assembly 11 Terminal cover plate 18 Disc spring 25 Refrigeration Oil
5 Motor stator assembly 12 Discharge check valve 19 Bearing lock nut 26 Suction flange
6 Motor rotor washer 13 Discharge cover plate 20 Male rotor 27 Discharge flange
7 Motor rotor spacer ring 14 Fixed Vi plug 21 Suction bearings 28 Cable box
RC2-200AV, RC2-230AV, RC2-260AV, RC2-300AV, RC2-310AV, RC2-340AV, RC2-370AV,
RC2-410AV, RC2-430AV, RC2-470AV, RC2-510AV, RC2-580AV construction
12
34 5 6
7
8914
15
16
17
18 19 20 21 22
23 24
2526
27
12 293028 10
11
13
Figure 2
Item
Description
Item
Description
Item
Description
Item
Description
1 Compressor casing 9 Oil separator demister 17 Discharge bearing fixed ring 25 Oil heater
2 Motor casing 10 Terminal cover plate 18 Disc spring 26 Refrigeration Oil
3 Oil separator 11 Discharge check valve 19 Bearing lock nut 27 Suction flange
4 Motor rotor assembly 12 Discharge flange 20 Male rotor 28 PTC terminals
5 Motor stator assembly 13 Discharge cover plate 21 Suction bearings 29 Cable box
6 Motor rotor washer 14 Fixed Vi plug 22 Suction bearing inner/outer spacer ring 30 Power bolt
7 Motor rotor spacer ring 15 Vi plug key 23 Oil guiding ring
8 Oil separator muffler 16 Discharge bearings 24 Suction filter

5
RC2-550AV, RC2-620AV construction
Figure 3
Item
Description
Item
Description
Item
Description
Item
Description
1 Compressor casing 9 Oil separator cartridge 17 Discharge bearings 25 Suction filter
2 Motor casing 10 Discharge check valve 18 Discharge fixed ring 26 Oil heater
3 Oil separator 11 Motor cable cover plate 19 Disc spring 27 Refrigeration Lubricant
4 Motor rotor assembly 12 Power bolt 20 Bearing lock nut 28 Suction flange
5 Motor stator assembly 13 Bearing seat’s cover plate 21 Male rotor 29 Discharge flange
6 Motor rotor washer 14 Modulation solenoid valve 22 Suction bearings 30 Cable box
7 Motor rotor spacer ring 15 Fixed Vi plug 23 Suction bearings inner/outer spacer ring 31 Thermostat terminals
8 Oil separator baffle 16 Vi plug key 24 Oil guiding ring
RC2-710AV, RC2-790AV, RC2-830AV, RC2-930AV Construction
Figure 4
Item
Description
Item
Description
Item
Description
Item
Description
1 Compressor casing 11 Discharge check valve 21 Bearing lock nut 31 Suction flange
2 Motor casing 12 Thermostat terminals 22 Male rotor 32 Discharge flange
3 Oil separator 13 Bearing seat cover plate 23 Suction bearings 33 Cable box
4 Motor rotor assembly 14 Modulation solenoid valve 24 Suction bearings inner/outer spacer ring 34 Power bolt
5 Motor stator assembly 15 Fixed Vi plug 25 Oil guiding ring
6 Motor rotor washer 16 Vi plug key 26 Oil level sight glass
7 Motor rotor spacer ring 17 Discharge bearings 27 Oil filler cartridge
8 Oil separator baffle 18 Discharge fixed ring 28 Suction filter
9 Oil separator cartridge 19 Disc spring 29 Oil heater
10 Motor cable cover plate 20 α-Balance piston 30 Refrigeration Lubricant

6
RC2-1020AV, RC2-1130AV, RC2-1270AV, RC2-1530AV construction
Figure 5
Item
Description
Item
Description
Item
Description
Item
Description
1 Compressor casing 10 Suction flange 19 Disc spring 28 Suction filter
2 Motor casing 11 Discharge flange 20 Balance piston 29 Oil heater
3 Oil separator 12 Discharge check valve 21 Bearing slot nut 30 Refrigeration Lubricant
4 Motor rotor assembly 13 Bearing seat cover plate 22 Male rotor 31 Thermostat terminals
5 Motor stator assembly 14 Modulation solenoid valve 23 Suction bearings 32 Motor cable cover plate
6 Motor rotor washer 15 Modulation slide valve 24 Suction bearings inner/outer spacer ring 33 Cable box
7 Motor rotor spacer ring 16 Slide valve key 25 Oil guiding ring 34 Power bolt
8 Oil separator Baffle 17 Discharge bearings 26 Oil level sight glass
9 Oil separator cartridge 18 Discharge fixed ring 27 Oil filler cartridge
2.4 Design features
HANBELL screw compressors feature simple and robust construction by elimination of some components such as
pistons, piston rings, valve plates, oil pumps which are found in reciprocating compressors. Without these components,
screw compressors run with low noise level, minimized vibration, high reliability and durability. HANBELL screw
compressors are of two-shaft rotary displacement design with the latest and advanced 5:6 patented screw rotors.
Screw rotors are precisely installed with roller bearings, i.e. radial bearings at both suction and discharge ends as well
as angular contact ball bearings i.e. axial bearings at discharge end. A three-phase, two-pole squirrel-cage induction
motor drives the compressor. The motor rotor is located on the shaft of the male screw rotor. Cooling of the motor is
achieved with suction refrigerant vapor.
Compressor technical features:
Full product range- RC2-V series compressor consists of 26 models with displacement ranging from 98 m
3
/hr up to
1539 m
3
/hr at 50Hz.
Multinational patents of high-efficiency screw rotors-The new 5:6 high efficiency screw rotor profile is patented in
Taiwan, UK, US, and China. This new large-volume, high-efficiency rotor profile is designed especially for modern refrigerant
characteristics. High-efficiency screw rotors are accomplished by using precision CNC machining centers, rotor milling machines,
rotor grinding machines. Strict ISO 9001 process controlling and the application of precise inspection equipments, such as ZEISS
3D coordinate measuring machines, ensure high-efficiency, high-quality, low-noise and low-vibration HANBELL RC2-V series
screw compressors.
High efficiency motor- Premium grade low-loss core steel with special motor cooling slot and refrigerant guide vane
which pilot the cold suction refrigerant gas through the motor provides the highest operating efficiency possible no
matter how strict operating conditions are. The winding and insulation is especially made for variable speed drive
application.
Long life bearings and high reliability- RC2-AV screw compressors utilize precise axial and radial bearings and α
axial balance piston to ensure longer bearing life and higher compressor reliability.

7
Double-walled rotor housing- Double casing structure with high strength inner ribs has been designed to minimize
noise and ensure rigidity. The rotor housing is made of high-strength gray cast iron FC25 that is extremely stable,
therefore no expansion will occur even at high-pressure condition. These casings are machined by computer aided
machining centers and inspected by precision measuring machines to enhance reliability.
Direct flange-on oil separator- A vessel made of ductile material FC 500 specially designed to withstand high
pressure and provide the highest efficiency of oil separation. Simple oil management, three-staged oil separator, low-
pressure-drop demister to ensure the minimum refrigerant dilution in the oil and maintain high oil viscosity.
Precise capacity control- Instead of slide valve, RC2-V series screw compressors modulate capacity by varying
rotation speed of motor rotor between 20 and 80(60) Hz.
Perceptive protection modules- RC2-V series screw compressors are equipped with PTC thermistors and motor
protection module which could monitor discharge and motor coil temperature. Accessories such as oil level switch to
monitor the level of oil, pressure differential switch, and pressure relief valve are options for specific applications.
Adaptable with additional cooling- Liquid injection connection port located on the motor casing and the compression
casing. There are also oil cooler connectors and economizer connection port to meet application needs.
2.5 Compression process
a. Suction and sealing:
At the beginning of the compression cycle, as the male rotor and female rotor unmesh, gas from suction port fills
the interlobe space (refer to the dark area in Figure 6). Refrigerant at suction pressure continues to fill it, until the
trailing lobe crosses the suction area and the gas is trapped inside the interlobe space.
b. Compression:
As the male rotor and female rotor meshes, the interlobe space moves towards to discharge end and its volume
decreases so that gas pressure increases consequently.
c. Discharge:
Gas is discharged from the interlobe space when the leading lobe crosses the discharge port whose volume ratio is
designed differently for various applications.
Figure 6 Compression process
2.6 Guide to VFD application
When operating RC2-V series screw compressor with frequency inverter (VFD, variable frequency driver), pay
attention to following points:
1. Max rotation frequency must be within nominal rotation frequency of the motor; min rotation frequency should be
20Hz.
2. To run compressors out of working frequency mentioned above, e.g. powering a 380V/3P/70Hz motor between 20
and 80Hz, please consult Hanbell before running. Running at frequency out of designed range will result in lower
efficiency or serious damage to the compressor and motor.
3. Consult your VFD supplier before installation to check if the ambient conditions are proper for the VFD. If
necessary, the VFD should be fully-enclosed for adequate cooling and humidity-control.
4. Consult your VFD supplier to get compatible NFBs for better protection.
5. An AC reactor should be installed between the power supply and the VFD (primary side). The installation of
another AC reactor between the compressor and the VFD (secondary side) is strongly recommended, especially
when the wiring length between the VFD and the motor is longer than 5m. Consult your VFD supplier for reactor
selection and installation.
6. Wiring of chiller controller and compressor protection modules such as PTC thermistors or oil level switch should
be isolated from wiring of the VFD’s power input/output to prevent interference.
7. VFD and compressor must be well-grounded respectively.
8. Use VFD phase loss and phase sequence detecting functions and nullify detection of motor protector INT69HBY to
(A) Suction and sealing
( B) Compression
(C) Discharge

8
V
Pd
Pd'
V
Pd<Pd'
P
Pd, Pd'
V
Pd=Pd'
P
Pd>Pd'
Pd'
Pd
P
prevent interference.
9. To prevent reverse rotation caused by incorrect wiring, inspect high/low pressures by pressure switches or
programming in commissioning.
10. High/low pressure differential of compressor should be kept above 4kg/cm
2
, especially at low rotation speed. If
there is external oil circuit, oil flow switch should be installed and oil pressure in the main oil return line should be
monitored to ensure adequate lubrication of compressor.
11. If high/low pressure differential or oil pressure in the main oil return line can’t be ensured, an oil pump or pressure
regulation valve must be installed.
2.7 Capacity control system
Although RC2-V series is similar to the RC2 series, the mechanism of capacity modulation has been changed from
slide valve into variation of motor rotation speed. Compared to modulating by slide valve, varying rotation speed
through VFD can greatly enhance effectiveness of compression, and especially volume efficiency under partial load.
On the other hand, VFD can supply motor adequate voltage and power input according to target rotation speed; in this
way, variation in power input during capacity modulation becomes more linear so it reduces unnecessary power loss.
As a result, capacity modulation by VFD is superior than by slide valve in volume efficiency and power consumption.
Capacity modulation by VFD is similar to step-less capacity modulation by slide valve. As long as VFD receives analog
signals e.g. DC 0~10V or 4~20mA from PLC or microcontroller, it directs the compressor to run at corresponding
rotation speed proportionally to achieve capacity modulation.
To have PLC or microcontroller control VFD stably, pay attention to the following notes:
1. Wiring for analog signals should be well-insulated to prevent interference and noise.
2. Wiring for signals connected to VFD should be isolated from wirings of VFD power supply at a distance.
3. PLC, microcontroller and VFD should be well-grounded respectively to prevent cross interference.
Procedures for initial setting are as follows:
1. When completing VFD setting, remove wiring of VFD power output, and check if VFD’s output frequency and
corresponding voltage comply with output signal of PLC or microcontroller, e.g. for DC 0~10V with 380V/3P/70Hz
motor, when analog signal is 10V, VFD output should be 70Hz and 380V; when analog signal is 7.14V, VFD output
should be 50Hz and 272V and so on.
2. VFD output current can’t be verified without any load but its frequency and output voltage still can be registered by
VFD display. VFD output voltage is not normal A/C voltage so it can’t be measured by general clamp meter.
3. In addition to analog signals, other communication between microcontroller and VFD should be checked also, such
as VFD failure feedback or reset command, etc…
2.8 Compressor volume ratio (Vi)
The volume ratio (Vi) of the compressor can be defined as the ratio of suction volume to discharge volume in the
compressor. The smaller the concavity of slide valve in the discharge end, the larger the volume ratio. The volume ratio
directly affects the internal compression ratio (Pi). Low Vi corresponds to low Pi and high Vi corresponds to high Pi. In
the equation below, in order to prevent over or under compression, the system compression ratio (CR) should be equal
to compressor’s internal compression ratio (Pi). Please refer to P-V (pressure – volume) diagram below to figure out
this relation.
CR = Pd/Ps
Pi = Vi
k
Vi = Vs/Vd
Figure 7 P-V Diagram
Where:
CR: system compression ratio Pi: internal compression ratio
Vi: internal volume ratio Pd: system pressure (absolute pressure)
Pd’: discharge pressure (absolute pressure) Ps: suction pressure (absolute pressure)
Vs: suction volume Vd: discharge volume K: refrigerant specific heat ratio
Under compression (CR > Pi)
Over
compression (CR < Pi)
CR = Pi
Loss of work Loss of work
1 2
3
4
Ps
1 2
3
4
Ps
Ps
1
2
3
4

9
2.9 Application limits
Application limits of the compressor vary significantly with the type of refrigerant used. The application limits shown below are
based on saturated suction and discharge operating conditions, for continuous operation over extended periods of time. It is
important to operate within these limits to maintain proper compressor life. Operating at extra low saturated suction temperature,
may cause oil management and motor cooling problems, while operating at extra high saturated condensing temperature will
shorten the compressor life due to insufficient motor and compressor chamber cooling.
Application limits of RC2-100AV~RC2-1530AV
Note:
1. When Hanbell screw compressors operate at partial or full load within application limits, motor coil and discharge
temperature will rise simultaneously. In order to keep compressor running safely and continuously, Hanbell
recommends the following additional cooling devices:
(1) Oil cooler or
(2) Liquid injection to chamber or
(3) Liquid injection to motor
Please use Hanbell selection software to get recommended additional cooling capacity.
2. Hanbell recommends monitor oil pressure and keep it 4 kg/cm
2
g over the suction pressure for adequate seal,
lubrication by pressure differential switch. Oil pump could be applied especially under operation conditions with low
condensing temperature and high evaporating temperature such as flooded water-cooled chillers whose high-low
pressure differential tends to be less than 4kg/cm
2
g. Contact Hanbell to verify potential operating conditions
outside the application limits shown above.
3. The minimum discharge superheat is 10K higher than the condensing temperature (normally discharge superheat
is around 20K) to avoid liquid returning to compressor and lubrication failure.

10
3. Lubricants
The main functions of lubrication oil in screw compressors are lubrication, internal sealing and cooling. At most
conditions, the design of positive pressure differential lubrication system makes RC2-AV series to run without extra oil
pump which is necessary for reciprocating compressors. However, in some special applications, it is still necessary to
install an extra oil pump to screw compressors for safety.
Bearings used in RC2-V series compressors require a small and steady quantity of oil for lubrication. Oil injection into
compression chamber creates oil film for sealing in the compression housing to increase efficiency and also dissipate
some compression heat.
Please pay attention to the oil temperature, which is crucial to compressor bearing life. Viscosity of oil becomes low at
high temperatures. Low viscosity of oil results in poor lubrication and poor heat dissipation in the compressor. Viscosity
should be over 10mm
2
/s at any oil temperature. Oil temperature in sump should be kept above the saturated
condensing temperature to prevent refrigerant migration into lubrication system.
If the compressor operates under critical operating conditions, oil cooler is required – please refer to Hanbell selection
software for the required capacity and oil flow of the oil cooler. High-viscosity oil is recommended for high operating
conditions because high discharge temperatures will make oil less viscous. Oil return could be problems from the
evaporator in refrigeration systems and flooded chillers, etc…, in which it is difficult for oil to be carried back and it may
cause oil loss for compressor. If the system encounters oil return problems, an extra 2
nd
oil separator should be
installed between the compressor discharge port and the condenser.
Every HANBELL RC2-AV compressors is equipped with oil sight glasses. The function of internal oil line sight glass is
to monitor lubricant flow to bearings. While reverse running, it is unable to see the oil flow via sight glass. The normal
oil level in the compressor oil sump should be maintained above the top of the low-level sight glass and in the middle
level of high-level sight glass when compressor is running. It is strongly recommended to install the optional accessory
of oil level switch to prevent compressor failure from oil insufficiency.
3.1 Lubricants table
SPECIFICATION UNITS HBR -B05 HBR -B08 HBR -B09 HBR -B04 HBR –B27
COLOR, ASTM
−
−
−
−
−
SPECIFIC GRAVITY 0.945 0.94 0.95 0.95
−
VISCOSITY 40℃
mm
2
/s (cSt)
64 131 175 215.9 150
100℃ 8.9 14.53 16.5 20.8 17.3
FLASH POINT ℃266 254 265 271 254
POUR POINT ℃-43 -36.5 -30 -25 -42
T.A.N mg KOH/g
−
−
−
−
−
COPPER STRIP
100 /3hr℃−−−−
−
MOISTURE ppm
−
−
−
−
−
FLOC POINT ℃
−
−
−
−
−
DIELETRIC STRENGTH
2.5mm kV −−46.6 −
−
Note: To use oils not listed in the chart, please consult HANBELL firstly for approval.
3.2 Pre-cautions of oil change
1. Use qualified oil only and do not mix different brands of oil. Choice of oil should match characteristics of the
refrigerant used. Some types of synthetic oil is incompatible with mineral oil. Oil remained in the compressor should be
totally cleaned up in the system before charging different brands of oil. Charge the compressor with oil for the first start
and then change it into new oil again to ensure that there’s no mix at all.
2. When using polyester oil for chiller systems, please make sure not to expose oil to the atmosphere for prevention of
change in its property. Therefore, it is necessary to vacuum the system completely when installing the compressor.
3. In order to ensure no moisture inside the system, it is suggested to clean the system by charging it with dry Nitrogen
and then vacuum it repeatedly as long as possible.
4. It is a must to change oil especially if the motor has burned out because acid debris may still remain inside the
system. Please follow the procedures mentioned above to change oil in the system. Check acidity of oil after 72 hours
of operation and then change it again until acidity of oil becomes normal.
5. Please contact Hanbell local distributors/agents for oil selection.

11
3.3 Oil change
1. Change oil periodically: Check lubrication oil every 10,000 hours of continuous running. For the first operation of the
compressor, it is recommended to change the oil and clean the external oil filter after 2,000 hours running. Check
whether the system is clean or not and then change oil every 20,000 hours or after 3 years’ continuous running while
the system operates in good condition.
2. Avoid clogging in oil filter with debris or swarf which may cause bearing failure. An optional oil pressure differential
switch is recommended. The switch will trip when the oil pressure differential between the primary and secondary sides
reaches the critical point and then the compressor will automatically shut down to prevent the bearings from damage
due to oil loss.

12
4. Compressor lifting and installation
4.1 Compressor lifting
Each HANBELL screw compressor has been carefully tested at the factory and every precautionary measures have
been taken to make sure that compressors will keep in perfect condition when reaching customers’ work. After the
compressor arrives at your warehouse, please check if its crate is kept in good condition and check all the compressor
accessories with shipping documents to see if there is any discrepancy.
When lifting the compressor, it is recommended to use a steel chain or steel cable which can be used for loading
capacity of 2000kgf as shown in the figure below. Make sure that chains, cables or other lifting equipments are properly
positioned to protect the compressor and its accessories from damaging. Keep the compressor in horizontal position
when lifting, and prevent it from crashing or falling on the ground, hitting the wall or any other accident that may
damage it or its accessories.
Figure 8
Lifting the compressor with steel chains or steel cables
Figure 9
Lifting the compressor with safety ropes
4.2 Mounting the compressor
The installation of the compressor in the refrigeration system should be made accessible and make sure that the chiller
base or site is far enough from the heat source to prevent heat radiation. The compressor should also be installed as
close as possible to electrical power supply for easy connection. Keep good ventilation and low humidity condition at
the site. Make sure that the frame or support is strong enough to prevent excessive vibration and noise while the
compressor is running and must reserve enough space for future overhauling work.
The compressor must be installed horizontally and in order to prevent excessive vibration transferred by the structure
and piping of the chiller while in operation, cushion or anti-vibration pads should be installed. The installation of the
anti-vibration pads is shown in Figure 10. The screws should only be tightened until slight deformation of the rubber
pads is visible.
※
It is strongly recommended to position the compressor higher than the evaporator
Compressor mounting pad
Fixed Bolt
Anti-Vibration Rubber
(6-15mm)
Figure 10 Installation of anti-vibration pads

13
Pipings:
Improper piping works could cause abnormal vibration and noise and might damage the compressor. Take notice of
the following points to prevent this situation from happening:
1. System cleanliness should be kept after welding the piping to avoid any swarf or debris inside the system as they
may cause serious damage to the compressor during operation.
2. In order to reduce the vibration on the piping tubes, it is recommended use copper tubes for suction and discharge
piping tubes. Copper tubes could limit the vibration in the piping while the compressor is in operation. In case steel
tubes are used, welding jobs are important to avoid any stress in the piping, which could cause harmonic vibration
and noise that damage compressors. If a large-caliber copper tube is not easily accessible and a steel tube is used
instead in suction piping, Hanbell also recommends use of a copper tube in discharge piping to minimize vibration
and noise.
3. Remove oxidized impurities, swarf or debris brought by welding in the piping tubes. If they fall into the compressor,
the oil filter might be clogged resulting in malfunctioning of lubrication system, bearings and capacity control
system.
4. The material of suction and discharge flanges is forged steel and it can be welded directly with piping. After welding
the flanges and pipes, it must be cooled down by ambient air. Do not use water to cool it down because water
quenching is prohibited.
Installing the compressor on slope:
Figure 11 shows a 15° limit of oblique angle for installation of compressor. In case the oblique angle is higher than the
limit, compressor will be shut down easily. For special applications like the installation in ships, fishing boats, etc…,
where the oblique angle might exceed the limit, external oil separators, oil tanks and related accessories are
recommended to be installed. Please contact HANBELL or local distributors for further layout recommendation.
Figure 11 Limits of oblique angle for the installation of the compressor

4.3 RC2-AV series compressor outline drawings

15

16
UNIT
SI: mm Imperial: (in)

17

18

19