Tecumseh Rotary Compressors HG Manual
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MANUAL INSTALLATION AND OPERATION
RK, RG and HG
1 General Information
1.1 1.2 1.3 1.4 The working principle of the Rotary Compressor Range Performance Voltage and range of operation 1.4.1 1.4.2 1.5 1.6 1.7 Single phase Three phase
Dimensions and connections Mountings Oil type
2 Operating Range
2.1 2.2 2.3 Operating envelope Operating compression ratio Operating pressure differential
3 Temperature Criteria
3.1 3.2 3.3 3.4 Ambient temperature Discharge temperature Motor temperature Return gas temperature
4 General Recommendations
4.1 4.2 System requirements Pipework design 4.2.1 4.2.2 4.2.3 4.2.4 4.2.5 4.3 4.3.1 4.3.2
Pipework design advice/guidance Connections Flexible connections Velocity within pipework and heat exchangers Capillaries Advice for installers Refrigerant charge Frequency of starts Start-up pressure
Starting 4.4.1 4.4.2
4 General Recommendations (continued)
4.5 4.6 Liquid return whilst operating Liquid migration during prolonged shutdown 4.6.1 4.6.2 4.7 Band heaters Non-return valves 22
Purging refrigerant from the system
5.1 5.2 5.3 Pressure Electrical Declaration of incorporation
6.1 6.2 Documents Contacts
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.
The working principle of the Rotary Compressor
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
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.
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.
RG range, accumulator capacity > 100 cm3
RK range, accumulator capacity > 160 cm3
RG range, accumulator capacity > 680 cm3
HG range, accumulator capacity > 70 cm3
HG range, accumulator capacity > 405 cm3
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.
VERTICAL Application RG R22
Air Conditioning or Heat Pump
HORIZONTAL RK R22 R134a HG R22
Commercial Refrigeration Low Back Pressure Commercial Refrigeration High Back Pressure
R407C R404A R134a R404A
R404A R134a R404A
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).
220.127.116.11 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.
18.104.22.168 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 136, which is listed in our Spare Parts and Accessories Catalogue.
22.214.171.124 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.
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.
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. MAXIMUM STANDARD RANGE MOUNTING RG HG RK 3 feet 4 feet 3 feet PLAY SETTINGS 021 13.8 Nm to 17.9 Nm (10 to 13 ft.lbs) STANDARD TORQUE
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.
APPLICATION REFRIGERANT R22
OIL Alkyl Benzene
Short pipe run* (<3,6m): Alkyl Benzene Long pipe run* (3,6m): PVE
Polyolester Polyvinyl ether Polyvinyl ether Polyolester
R404A R404A R134a
* 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.
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 20C 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. APPLICATION REFRIGERANT R22
COMPRESSION RATIO 7 15.15.8
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. APPLICATION REFRIGERANT R22
PRESSURE DIFFERENTIAL (BAR) 22 23.27.23
The compressors have been designed to operate in the following ambient temperatures (with forced air cooling). AMBIENT TEMPERATURE Air Conditioning or Heat Pump Commercial Refrigeration 46C 43C
Comment: For air conditioning applications operating in high ambient conditions, see our tropical range. These products use R-134a and have an evaporating temperature range of 10C to +30C, and a condensing temperature range of +30C to +80C for a temperature of 55C.
The maximum discharge temperature is 127C. This temperature can be measured by soldering a thermocouple onto the discharge pipe 5 cm from the compressor and insulating it for 10 cm.
All our single phase rotary compressors are supplied with an external overload protector. The maximum permitted operating temperature is 130C which is measured by the resistance variation method. Resistance variation method: Leave the application switched off in a constant temperature (temperature t1) for at least 8 hours. Measure the motor winding resistance R1 at this temperature t1. With three phase motors, measure the resistance between 2 electrical supply terminals to the compressor. Run the application in the most difficult conditions foreseeable, switch off the machine and immediately measure the new motor winding resistance (R2). With three phase motors, measure the resistance between the 2 terminals used before. The new temperature t2 can easily be calculated using the following equation:
t1 & t2 are given in degrees Celsius.
Return gas temperature
A minimum superheat of 10K is necessary between the evaporating temperature and suction temperature at the inlet of the compressor. However, it is necessary to control superheat to prevent exceeding the maximum return gas temperature for the compressor and the compressor motor (see sections 3.2 and 3.3).
Rotary compressors are direct suction. The suction gas enters directly into the compression chamber. The suction accumulator incorporates a filter to protect the compressor against dirt and debris entering the pump. It is essential that all necessary precautions are taken to ensure the system is kept clean during installation and service e.g. purge the system with Nitrogen whilst brazing.
3 - The above design can be simplified by using a pump down control system. This system requires the installation of a solenoid valve (LLSV) prior to the expansion device (EXV). The compressor is controlled by a low pressure switch. Before pump down can occur, the solenoid valve must be closed in order to pump out the evaporator and transfer the refrigerant to the high pressure side. As the low pressure in the suction reaches the cut off point of the low pressure switch, the pressure switch stops the compressor. Liquid cannot therefore accumulate at the suction of the compressor. The suction piping then drops directly towards the compressor. Pump down
126.96.36.199.1 Discharge pipework
The discharge pipework carries refrigerant gas compressed by the compressor to the condenser. The main factors to consider are: > Minimum pressure drop, > The velocity is sufficient to take the oil to the condenser even when there is only a partial charge, > Ensure that liquid (oil, refrigerant or both) does not migrate towards the compressor during the off cycle. In practice, discharge piping can be designed for a pressure drop of up to 1C at saturation temperature. Pressure drop in the discharge pipework can cause a slight reduction in capacity as the compressor has to operate at a discharge pressure higher than the condensing pressure.
If the installation is such that the compressor is the coldest part of the system (i.e. has the lowest temperature), a non-return valve must be fitted close to the condenser to isolate the condenser from the compressor. The valve is also an advantage during start-up where a large pressure differential may occur. (see 4.4.2)
188.8.131.52.2 Liquid pipework
The liquid line supplies liquid refrigerant to the expansion device from the condenser/receiver. When sizing a liquid line the main factors to consider are: > The re-heating of the duct, > Minimum pressure drop. In this part of the system, because the oil and refrigerant are miscible, oil flow does not present any particular problems. However, attention must be paid to ensuring there is a constant supply of liquid to the expansion device. Under no circumstances must the refrigerant be heated and pressure changes in the pipework must be prevented. If liquid refrigerant experiences a pressure below its saturation pressure, it will vaporize within the pipework. To ensure the expansion device functions correctly, the pressure of the liquid reaching it must be sufficiently high, and preferably, slightly subcooled. It is essential to restrict the pressure drop in the pipework for the following reasons: > To prevent a reduction in the mass flow through the expansion device, > To prevent partial vaporization of the liquid refrigerant prior to the expansion device (pressure drop higher than subcooling). The components fitted to the liquid line such as the filter drier, solenoid valve, liquid line sight glass also cause varying pressure drops. The pressure drop in this pipework must not exceed 0.5C.
184.108.40.206.3 Positioning of accessories on the liquid line
The diagrams below show the normal position of accessories on the liquid line. The filter drier must be positioned next to the expansion device to prevent clogging by impurities. It should be installed in a vertical position with the outlet downwards to ensure constant liquid supply to the expansion device. The liquid sight glass should be positioned between the drier and the expansion device in order to indicate that: Liquid line - position of accessories > Liquid / vapour is present, > The level of risedual humidity.
The rotary compressors have copper connections. The positioning of connections is given in the Technical Data Sheets. Please note the following: Brazing should be carried out using an inert gas (Nitrogen). Protect paintwork while brazing by covering the accumulator and compressor with a damp cloth. Do not allow the flame to come in contact with paintwork. Brazing of the connections must comply with the recommendations of the Standard NF EN 378-2. Carry out pipe cutting and bending operations carefully in order to prevent dust and swarf contaminating the system. Care should be taken to ensure that flux does not contaminate the system.
4.2.3 Flexible connections
Rotary compressors do not have internal mounting springs, in contrast to the majority of hermetic compressors. The internal design and external mountings are designed to reduce vibration. However, some vibration is transmitted to the suction and discharge pipework. We therefore recommend using flexible connections to prevent vibration being transmitted to the rest of the installation. We recommend using annealed copper pipe rather than hard drawn. A suggested design of flexible connections for this range of compressors and their applications is shown in the diagrams in the Appendices (see p. 25). The general design of the pipework can be adjusted according to your equipment. The recommended suction loop of 3/8 inch and 1/4 inch discharge should be adhered too. Great care should be taken when designing the system and correct refrigeration practices must be followed to ensure the oil return to the compressor.
4.2.4 Velocity within pipework and heat exchangers
To ensure correct running of the installation and to assure the working life of the compressor, it is recommended that pipework be calculated using the velocities shown in the table below.
SUCTION Connections Anti-vibration loops Pipework Evaporator Condenser 4 m/s 3 m/s Minimum Maximum 25 m/s 15 m/s 8 m/s
DISCHARGE Minimum Maximum 25 m/s 4 m/s 15 m/s
LIQUID Minimum Maximum
Anti-vibration loops are used to provide a very flexible pipework system which absorbs vibration. The velocity in the AV loops should not exceed that stated in the table. A minimum velocity of 8 m/s is necessary in any vertical risers, suction or discharge to ensure adequate oil return to the compressor. The velocity within the heat exchangers should not drop below 3 m/s to guarantee oil return. The table page 21 lists the velocities for different internal diameter pipework and compressor models. The choice of pipework should therefore be made for a particular model of compressor and specified type of connection (suction, discharge or liquid pipework) in accordance with the velocity ranges recommended in the above table.
In the case of the heat exchangers, the number of circuits can be defined on the basis of the refrigerant velocity circulating in the tubes, taking as reference the value calculated at the suction for the evaporator and at the discharge for the condenser.
Refrigerant velocity in the suction pipework (in m/s)
CAPILLARY - INTERNAL DIAMETER (mm)
7.7 9.1 Suction 4.9 5.8 6.4 8.4 5.2 6.3 7.2 8.9 5.1 6.2 6.9 9.0 6.5 3.4 4.1 4.5 5.8 3.6 4.3 5.0 6.2 3.6 4.3 4.8 6.2 4.5 7.4 9.6 4.4 5.0 5.6 6.1 4.4 4.8 5.7 6.1 7.0 8.5 9.7 4.4 4.9 5.3 6.2 4.3 5.0 5.7 6.2 7.0 8.1 9.2.5 3.0 3.3 4.3 2.7 3.2 3.7 4.5 2.6 3.2 3.5 4.6 3.3 5.5 7.0 3.2 3.6 4.1 4.5 3.3 3.5 4.2 4.5 5.1 6.2 7.1 3.3 3.6 3.9 4.6 3.2 3.7 4.2 4.6 5.1 6.0 7.1.9 2.3 2.5 3.3 2.0 2.4 2.8 3.5 2.0 2.4 2.7 3.5 2.6 4.2 5.4 2.5 2.8 3.1 3.5 2.5 2.7 3.2 3.5 3.9 4.8 5.5 2.5 2.8 3.0 3.5 2.4 2.8 3.2 3.5 3.9 4.6 5.6.7 7.9 8.7 11.3 18.5 22.1 25.Discharge 1.2 1.5 1.6 2.1 3.4 4.1 4.6 5.7 2.9 3.5 4.0 5.2 3.9 6.4 8.2 3.9 4.4 5.0 5.5 4.0 4.3 5.2 5.5 6.3 7.6 8.7 4.4 4.9 5.2 6.2 4.3 4.9 5.6 6.2 6.9 8.0 9.4 0.7 0.9 1.0 1.3 2.1 2.5 2.8 3.5 1.8 2.1 2.4 3.1 2.4 3.9 5.0 2.4 2.7 3.0 3.3 2.4 2.6 3.1 3.3 3.8 4.6 5.3 2.7 3.0 3.2 3.7 2.6 3.0 3.4 3.7 4.2 4.9 5.0.5 0.6 0.6 0.8 1.4 1.6 1.9 2.3 1.2 1.4 1.6 2.1 1.6 2.6 3.3 1.6 1.8 2.0 2.2 1.6 1.7 2.1 2.2 2.5 3.1 3.5 1.8 2.0 2.1 2.5 1.7 2.0 2.3 2.5 2.8 3.3 3.5 Liquid 11
, where D1 is the available diameter and L1 the new length to be calculated.
D2 and L2 are respectively the recommended diameter and length listed in the tables (p. 18-19-20). The tables give the recommended internal diameters and capillary length. Note that a laboratory test with a longer capillary may give better results. However, if these parameters were to be generally applied, problems would occur in a number of applications. A variation of 1/10 th in the diameter will affect the length of the capillary. It is essential to use capillary line specified as calibrated for refrigeration when selecting your capillaries. Capillary lengths from 1.5 m up to 3 m are considered to provide the best performance. A capillary tube that is too short increases the risk of hunting. A capillary tube that is too long will not allow the operating conditions to change and will require longer for the system to equalize. This will be problematic in systems where the cycle time is short. In addition, the pull down time will be longer. It is important to highlight the effect the charge of refrigerant has on the operation of systems with capillary tube. A different charge weight of refrigerant is required for each capillary. It is therefore essential to test the capillary / refrigerant charge combination when carrying out validation tests. If different capillaries are tested with the same charge, the results will differ.
> Insufficient charge results in low evaporation temperature, causing a reduction in cooling and only partial use of the heat exchange surface of the evaporator, > Excessive charge can cause excessive discharge pressure, overloading of the compressor, liquid slugging to the compressor as well as reducing the capacity of the evaporator. The use of a liquid / suction line heat exchanger made from the capillary tube and suction pipework will produce: > A 5% increase in performance, > Greater reliability by reducing the likelihood of liquid / wet gas slugs. It is even more effective when the contact, i.e. the heat exchange surface, is as long as possible or when more than one capillary is used (2 capillaries are preferable to 1). The diagrams below show the different types of heat exchange which can be used.
Capillary fixed onto the suction line by aluminium tape
Capillary soldered to the suction line
220.127.116.11 Testing a capillary
In the case of mass produced equipment, testing may be necessary due to slight manufacturing variations in the internal diameter, roundness and internal finish of the capillary. Select a capillary of the appropriate dimensions for the installation using the tables and test it in the refrigeration system. It is then easy to obtain identical capillaries for other installations of the same type.
For this procedure use a cylinder of dry Nitrogen (or other source of dried and filtered compressed air) fitted with a manual pressure regulator to ensure a constant pressure of, for example, 14 bar. A capillary of the same dimensions as the one already tested in the system is fitted between pressure gauges 1 and 2. This will be used as the reference capillary. The calibrated capillary is fitted to the outlet of pressure gauge 2. This is the reference datum capillary. Adjust the manual regulating device, take a reading of the pressures indicated. For example: pressure gauge 1, 14 bar; pressure gauge 2, 7.8 bar. These levels represent the reference pressure level. Maximum sensitivity is obtained with a pressure from pressure gauge 2 equal to half the reading from pressure gauge 1. Then replace the reference tube with the capillary to be checked. Adjust the manual regulating device to read 14 bar on pressure gauge 1. - If the tube to be checked is identical to the reference capillary, pressure gauge 2 will give a reading of 7.8 bar. - If the pressure reading from pressure gauge 2 is above 7.8 bar, the capillary is too resistant and must therefore be shortened. - If the pressure reading from pressure gauge 2 is lower than 7.8 bar, the capillary is not suitable for this application. NOTE: the pressure values 14 and 7.8 bar are arbitrary and are used only as an example. It is not recommended, however, to work below 5 bar on pressure gauge 1.
18.104.22.168 LBP R404A applications
In tables listing capillary size, 2x refers to parallel capillaries. CAPILLARY - INTERNAL DIAMETER 0.8 mm 0.mm 0.042 1.2 mm 0.049 0.052 0.054 2x3m HG/RG2426Z 2x3m HG/RG2432Z 2x2.5m 2x3.5m 1.5m 2x2m HG/RG2436Z 2x2m HG/RG2446Z 2x2m
2m 2x1.5m 2x2.5m
3m 2.5m 2x3m 2.2m 2x2m 1.5m 3.5m 2.5m
The grey cells refer to cabinet applications with product temperatures in the region of -20C. The other cells are deep freeze cabinet applications with product temperatures in the region of -30C.
22.214.171.124 MHBP R404A applications
CAPILLARY - INTERNAL DIAMETER
0.042" 1.2 mm 0.049" 0.050" 0.052" 0.054" 0.059" 0.064" 0.069" 0.075" 2 mm 1.5 mm 2x3.5 3.5m 2.4m 2.8m 1.4m 2m 3m 3.8m.080'' 2.2 mm
HG or RG4467Z HG or RG4480Z HG or RG4492Z HG or RG4512Z
2x2m 2x2m 1.4m 1.7m 2x1.4m 2x2m 2x3.5m 2x3.9m 1.80
2x2.5m 2x3m 2m 2.5m
2x1.8m 2x2.m 2x2.5m 2x3.5m 1.5m 1.5m 1.9m 2.6m 3.5m
2x1.5m 2x1.6m 2x2.2m 2x2.9m 2x2.3m 2x2.9m 2x3.6m 1.5m 2m 3.2m
2x2m 2x2.9m 2x1.7m 2x2.1m 2x2.2m 2x2.5m 2x2.7m 2x3.3m 1.5m 2.1m 3.2m
The grey cells refer to bottle cooler cabinet applications operating at +5C evaporation temperature and +50C condensing temperature. The other cells refer to an application operating around -10C evaporation temperature and +45C condensing temperature. All MHBP applications should come within these two operating envelopes.
126.96.36.199 HBP R134a applications
0.042''/ 1.2 mm 1.067mm 0.049" 0.052" 0.055" 0.049 0.064" 0.069"
HG/RG4445Y 2x1.5m HG/RG4450Y HG/RG4460Y HG/RH4476Y
2.6m 1.8m 1.5m
3.5m 2.5m 2.m 1.4m 3.m 2.m 3.m
2x3m 2x3.5m 1.5m 2x2.5m 2x3.5m
2x1.7m 2x2m 2x2.5m 2x3m
The operating envelope is +5C evaporation temperature +50C condensing temperature, with 0K subcooling.
188.8.131.52 A/C R22 applications
1.0 mm 0.042" 1.2 mm 0.049" 0.052" 0.055" 0.059"/ 0.064" 0.069" 0.075" 2 mm 2.2mm 1.5mm 2m 1.7m 2.8m 2.3m 2m 3.3m 2.7m 2m 2.2m 1.7m 3m 2.3m 1.9m 3.3m 2.6m 2m 3m 2.5m 3m 2.4m 1.7m 3.5m 2.8m 3m
HG/RG5480E HG/RG5492E HG/RG5510E HG/RG5512E RK5480E RK5490E RK5510E RK5512E RK5513E RK5515E RK5518E
2x1.8m 2x2.7m 2x3.2m 2x2.3m 2x2.7m 2x2.3m 2x2.7m
2x2.3m 2x2.8m 2x1.9m 2x2.9m 2x3.4m 2x2.3m 2x2.7m 2x2.2m 2x2.6m 2x2.3m 2x2.8m 2x1.9m 2x2.3m 2x1.7m 2x2.4m 2x3.2m 2x1.9m 2x2.6m 1.7m
The operating envelope is +5C evaporation temperature and +50C condensing temperature, with 0K subcooling.
184.108.40.206 A/C R407C applications
1.0 mm 0.042" 1.2 mm 0.049" 0.052" 0.055" 0.059"/ 0.064" 0.069" 0.075" 2 mm 2.2mm 1.5mm 1.6m 1.4m 2.2m 1.8m 1.6m 2.6m 2.2m 1.6m 1.8m 1.4m 2.4m 1.8m 1.5m 2.6m 2m 1.6m 2.4m 2m 2.4m 1.9m 1.4m 2.8m 2.2m 2.4m
HG/RG5480C HG/RG5492C HG/RG5510C HG/RG5512C RK5480C RK5490C RK5510C RK5512C RK5513C RK5515C RK5518C
2x1.4m 2x2.2m 2x2.6m 2x1.8m 2x2.2m 2x1.8m 2x2.2m
2x1.8m 2x2.2m 2x1.5m 2x2.3m 2x2.7m 2x1.8m 2x2.2m 2x1.8m 2x2.0m 2x1.8m 2x2.2m 2x1.5m 2x1.8m 2x1.4m 2x1.9m 2x2.6m 2x1.5m 2x2.0m 1.4m
The operating envelope is +5C evaporation temperature and +50C condensing temperature (Mid/Mid), with OK subcooling.
4.3.1 Advice for installers
After pulling a vacuum in the system, break the vacuum by using the refrigerant specified on the compressor identification plate. Charge into the liquid line between the condenser and the expansion device an amount of refrigerant below that of the nominal charge so that the pressure is above atmospheric pressure. The remaining refrigerant can then be charged in vapour form into the suction line while the compressor is running. To prevent liquid refrigerant entering directly into the compressor, connect to the suction accumulator inlet if fitted and use an expansion device, either a capillary or orifice, to restrict the flow.
4.3.2 Refrigerant charge
If refrigerant migration is a problem, use the following recommended charges: 700 gms maximum for RG and HG compressors, 800 gms maximum for RK compressors. We strongly recommend reducing charge weight as much as possible by designing a system with a low internal volume (e.g. by using high efficiency heat exchangers, low internal volume heat exchangers, short pipe runs or removing the liquid receiver when not essential.). The refrigerant gas passes through the suction of the compressor into the compression chamber, where it is compressed and discharged into the compressor shell. This leads to a higher compressor shell temperature than in low pressure shell compressors. When charging do not use the temperature of the compressor shell as a guideline for a full charge. High pressure shell compressors take longer to reach normal operating pressure when starting from cold than low pressure shell compressors. This is due to the additional volume of the compressor casing and refrigerant being entrained in the oil. Condensing pressure will only reach the operating level if the entrained refrigerant evaporates completely.
Never switch on a compressor when under vacuum, an electric arc can occur inside the compressor.
4.4.1 Frequency of starts
Under no circumstances should 10-12 starts per hour be exceeded. Where this is the case an anti-short cycle or time delay relay must be fitted.
4.4.2 Start-up pressure
A maximum pressure differential of 6 bar between discharge and suction pressure is acceptable at start-up for commercial high start torque compressors. If the pressure differential is above the recommended level due to design factors, a non-return valve in the discharge pipework near the compressor will allow the pressure differential to return to an acceptable level within 3 minutes. This recommendation is also valid for refrigeration systems fitted with an expansion valve. Systems fitted with a capillary do not require a non-return valve as pressure equalization occurs via the capillary.
Liquid return whilst operating
Compressor running with a dirty or partially blocked evaporator filter > 1 Expansion valve orifice too large or stuck open > 1 - 2 Insufficient air flow > 2 Re-circulation of air to the evaporator > 2 Overcharging with refrigerant > 3 - 4
Declaration of incorporation
The compressors are defined as for installation in machines according to the Machinery Directive 89392CE appendix II B, and the Pressure Equipment Directive 97/23/CE 97/23/CE. A Declaration of incorporation is available on our website at www.tecumseh-europe.
Application Envelope High Back Pressure Commercial Application Envelope Low Back Pressure Commercial Application Envelope Air Conditioning Anti-Vibration Piping for HGA Commercial Refrigeration Compressors Anti-Vibration Piping for HGA Air Conditioning Compressors Anti-Vibration Piping for RGA Air Conditioning Compressors Anti-Vibration Piping for RK Air Conditioning Compressors 27
Customer Technical Support: Tel. Fax: +33 (0) 04 +33 (0) 89
Email: firstname.lastname@example.org Website: http://www.tecumseh-europe.com
Figure 1 | Application Envelope High Back Pressure (HBP)
for Rotary Compressors RG & HG
Condensing temperature (C)
Evaporating Temperature (C)
Figure 2 | Application Envelope Low Back Pressure
Figure 3 | Application Envelope Air Conditioning
26 Evaporating Temperature (C)
Figure 4 | Anti-Vibration Piping for HGA
Commercial Refrigeration Compressors
Figure 5 | Anti-Vibration Piping for HGA
Air Conditioning Compressors
Figure 6 | Anti-Vibration Piping for RGA
Figure 7 | Anti-Vibration Piping for RK
Longueur dOnde - 07.2004
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