Tecumseh ROTARY COMPRESSORS HG, ROTARY COMPRESSORS RG, ROTARY COMPRESSORS RK, RK, RG Installation And Operation Manual
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MANUAL
INSTALLATION AND OPERATION
Rotary Compressors
RK, RG and HG
2
General Information 5
The working principle of the Rotary Compressor 5
Range 6
Performance 7
Voltage and range of operation 7
1.4.1 Single phase 7
1.4.2 Three phase 7
Dimensions and connections 8
Mountings 8
Oil type 8
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Operating Range 9
Operating envelope 9
Operating compression ratio 9
Operating pressure differential 9
2
2.1
2.2
2.3
Temperature Criteria 10
Ambient temperature 10
Discharge temperature 10
Motor temperature 10
Return gas temperature 10
3
3.1
3.2
3.3
3.4
General Recommendations 11
System requirements 11
Pipework design 11
4.2.1 Pipework design advice/guidance 11
4.2.2 Connections 14
4.2.3 Flexible connections 14
4.2.4 Velocity within pipework and heat exchangers 14
4.2.5 Capillaries 16
Refrigerant charge 21
4.3.1 Advice for installers 21
4.3.2 Refrigerant charge 21
Starting 21
4.4.1 Frequency of starts 21
4.4.2 Start-up pressure 21
4
4.1
4.2
4.3
4.4
3
Security 23
Pressure 23
Electrical 23
Declaration of incorporation 23
5
5.1
5.2
5.3
Appendices 25
Documents 25
Contacts 25
6
6.1
6.2
General Recommendations (continued)
Liquid return whilst operating 22
Liquid migration during prolonged shutdown 22
4.6.1 Band heaters 22
4.6.2 Non-return valves 22
Purging refrigerant from the system 22
4
4.5
4.6
4.7
General Information
The working principle of the Rotary Compressor
Rotary compressors are ‘high pressure shell’ type compressors. The suction on these compressors
is taken directly into the compression chamber. Gas compressed in the compression chamber is
discharged into the compressor casing. It should be noted that from a cold start-up, high pressure shell
type compressors take longer to reach their normal operating pressure in the compressor shell. This
is partly due to the larger volume of the compressor casing and partly as a result of refrigerant being
trapped in the oil. Any refrigerant in the oil has to completely evaporate before condensing pressure can
reach its operating level.
1
1.1
5
Tecumseh Europe with its long experience of compressor development has introduced
a range of rotary compressors for air conditioning and commercial refrigeration.
This operating manual has been designed to help you correctly install this compressor
range in your applications.
1|Names of the different pieces 2|End of suction and the start of compression
3|Start of compression and suction 4|Compression and suction
5|Compressed gas exit
6
1.2
Sucking bottle
Excessive refrigerant, oil or impurity in the suction chamber of the compressor can result in mechanical
damage. As a result, all our compressors are fitted with an accumulator equipped with a filter.
Please note that overcharging with refrigerant is one of the major causes of damage to the compressor.
It is important to check the amount of refrigerant being used is correct.
Range
Application
VERTICAL HORIZONTAL
Air Conditioning
or Heat Pump
RG range, accumulator
capacity > 100 cm
3
RK range, accumulator
capacity > 160 cm
3
RG range, accumulator
capacity > 680 cm
3
HG range, accumulator
capacity > 405 cm
3
HG range, accumulator capacity > 70 cm
3
Commercial Refrigeration
Low Back Pressure
RG RK HG
R22 R22 R22
R134a
R407C R407C R407C
Commercial Refrigeration
High Back Pressure
R134a R134a
R404A R404A
VERTICAL
AIR CONDITIONING COMMERCIAL
HORIZONTAL
R404A R404A
7
Performance
Please refer to the Technical Data Sheets for information on compressor performance.
Voltage and range of operation
The voltage range of the rotary compressors corresponds to the standard ranges defined by Tecumseh
Europe. See the General Catalogue for more information.
Start-up should never be carried out when the electrical cover has been removed.
1.4.1 Single phase
Single phase compressor motors are two pole asynchronous and they are designed to be used with
different types of starting method depending on the application (PSC, CSR, CSIR).
Please ensure the starting mode follows that specified on the Technical Data Sheet for each product.
We recommend the use of components specified by Tecumseh Europe.
For wiring instructions, follow the diagram supplied with the compressor.
Ensure that the start and run windings are connected correctly otherwise damage to the motor will
result (see label below).
1.4.1.1 Motor protection
The motor is protected by an externally mounted temperature and current sensitive overload. It is imperative that the overload protector is connected as it cuts off the power supply to the compressor if a fault
occurs. For wiring instructions, follow the wiring diagram supplied with the compressor.
1.4.2 Three phase
All rotary compressors which have a model number beginning with a letter ‘T’ are equipped with a three
phase motor.
Three phase motors are wired in star, and the resistance measured between two terminals corresponds
to the resistance of that coil.
Ensure that each compressor conforms to the information given on the Technical Data Sheet.
We recommend the use of components specified by Tecumseh Europe.
For wiring instructions, follow the diagram supplied with the compressor.
1.4.2.1 Phase control
Care should be taken when connecting three phase rotary compressors to ensure that the direction of
rotation is correct as rotation occurs in one direction only.
ATTENTION: If the rotational direction is incorrect, the compressor will not refrigerate and the life of the
product will be reduced. However, a short test period will not cause damage.
To ensure correct rotation we recommend the use of our phase detector reference number 8 535 136,
which is listed in our Spare Parts and Accessories Catalogue.
1.4.2.2 Protection of the motor
The motor is protected from overheating by an external overload protector which must be connected.
This device has a single contact and cannot be wired into the three phase electrical supply of the compressor (a three phase motor can only operate with a minimum of 2 active phases). The protector should
therefore be wired into the control circuit of the compressor so that it cuts the power supply if a fault
occurs. For wiring instructions, see the electrical diagram supplied with the compressor.
For further information on protecting the compressor against high current, please contact the technical
application department at Tecumseh Europe.
1.3
1.4
8
RG
STANDARD
MOUNTING
STANDARD
PLAY
HG
4 feet 8 682 025
3 feet 8 682 021
RK
1.5
1.6
1.7
RANGE
MAXIMUM
TORQUE
SETTINGS
3 feet 8 682 021
13.8 Nm to 17.9 Nm
(10 to 13 ft.lbs)
Air Conditioning
or Heat Pump
REFRIGERANT OIL
APPLICATION
R22 Alkyl Benzene
R134a Polyolester
R404A Polyvinyl ether
R134a Polyolester
R404A Polyvinyl ether
Commercial Refrigeration
Low Back Pressure
Commercial Refrigeration
High Back Pressure
Short pipe run* (<3,6m): Alkyl Benzene
Long pipe run* (≥3,6m): PVE
R407C
Dimensions and connections
The dimensions and the position of the connections are given in our Technical Data Sheets.
The compressors can tolerate an angle of tilt of +/- 7° for vertical models and +5°/0° for horizontal versions.
Mountings
We recommend the fitting of anti-vibration mounting feet as specified by Tecumseh Europe (see table
below).
Natural or synthetic rubber products bearing weight for long periods tend to loose their shape. This
occurs more quickly when they are subject to an excessive loading and/or heat. Anti-vibration mounting
feet should be regularly checked to ensure optimal operation of the installation and replaced where
necessary to ensure the sound level does not increase.
The length of the AV mount insert used allows the mounts to function correctly and prevents overtightening.
Specific mounts can be supplied for applications where greater vibration reduction is required. For further
information, contact your local representative.
Oil type
* Short or long pipe run: Distance between the condenser and the evaporator.
The design of the rotary compressors is such that an oil change or the addition of oil should not be
carried out.
We strongly advise against adding oil to the refrigeration system whether the pipework is long or short.
9
Operating Range
Operating envelope
The operating envelope is in accordance with EN 12 900, with a superheat of 10K for air conditioning
and heat pump applications, and return gas of 20°C for all other applications (See diagrams in
the appendices).
For more information please refer to the Technical Data Sheet for each product.
Operating compression ratio
The operating compression ratio is the ratio between absolute condensing and evaporating pressures.
It is essential to adhere to the maximum values listed in the following table.
Exceeding these values will reduce the working life of the compressor or even cause a breakdown.
Operating pressure differential
The operating pressure differential corresponds to the difference between absolute discharge and suction pressure. Maximum levels are listed in the table below. Exceeding these values will reduce the working life of the compressor or even cause a breakdown.
2
2.1
2.2
2.3
Air Conditioning
or Heat Pump
REFRIGERANT COMPRESSION RATIO
APPLICATION
R22 7
R134a 15.8
R407C 7
R404A 8
R134a 15.8
R404A 22
Commercial Refrigeration
Low Back Pressure
Commercial Refrigeration
High Back Pressure
Air Conditioning
or Heat Pump
REFRIGERANT PRESSURE DIFFERENTIAL (BAR)
APPLICATION
R22 22
R407C 23.5
R134a 23
R404A 25
R134a 23
R404A 27.1
Commercial Refrigeration
Low Back Pressure
Commercial Refrigeration
High Back Pressure
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