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AE4-1322
Semi-Hermetic Compact
Semi-Hermetic Compact
Semi-Hermetic Compact
Semi-Hermetic Compact Application Manual
Semi-Hermetic Compact
SCH2 & SCA2
SCH2 & SCA2
SCH2 & SCA2
SCH2 & SCA2
SCH2 & SCA2
High Temp Compressors
35 - 140 Horsepower
1 General
1 General
1 General
2 Design and functions
2 Design and functions
2 Design and functions
2.1
2.2
2.3
2.4
2.5
2.6
3 Lubricants
3 Lubricants
3 Lubricants
3 Lubricants
4 Integration into the refrigeration circuit
4 Integration into the refrigeration circuit
4 Integration into the refrigeration circuit
1.1
1.2
1.3
1.4
Additional cooling by liquid injection
1.5
Additional cooling by external oil
© 2002 Copeland Corporation
Issued 4-2002
Printed in U.S.A.
™
Copeland Screw
Copeland Screw
Copeland Screw
Copeland Screw
Copeland Screw
Contents
www.HVACRinfo.com
™
Compressors
Compressors
Compressors
Compressors
Compressors
Application Manual
Application Manual
Application Manual
Application Manual
5 Economizer operation
5 Economizer operation
5.1
5.2
5.3
ECO operation with subcooling circuit
5.4
5.5
5.6
5.7
6 Electrical connections
6 Electrical connections
6 Electrical connections
6.1
6.2
6.3
6.4
April 2002
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Summary of Contents for Emerson Copeland Screw SCH2
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Page 1: Table Of Contents
www.HVACRinfo.com For more free Copeland literature please visit ™ AE4-1322 April 2002 ™ Copeland Screw Copeland Screw Copeland Screw Compressors Compressors Compressors Copeland Screw Copeland Screw Compressors Compressors Semi-Hermetic Compact Semi-Hermetic Compact Application Manual Application Manual Semi-Hermetic Compact Semi-Hermetic Compact Semi-Hermetic Compact Application Manual Application Manual Application Manual... -
Page 2: General
AE4-1322 Semi-hermetic compact screws Semi-hermetic compact screws Semi-hermetic compact screws Semi-hermetic compact screws Semi-hermetic compact screws vapor, which mainly flows through bores in the motor SCH2/SCA2 series SCH2/SCA2 series SCH2/SCA2 series SCH2/SCA2 series SCH2/SCA2 series rotor. 35 to 140 HP Nominal motor power 35 to 140 HP Nominal motor power 35 to 140 HP Nominal motor power 35 to 140 HP Nominal motor power... -
Page 3: Compression Process Vi Control
AE4-1322 • Integrated PTC sensors in each winding coil • Slot keys for maximum operating safety • Stator is slide fit (field replaceable) Intelligent electronics Intelligent electronics Intelligent electronics Intelligent electronics Intelligent electronics • Thermal motor temperature control by winding PTCs •... -
Page 4: Hydraulic Control
AE4-1322 Figure 3 Oil Hydraulic Scheme Another feature of this system is the automatic start- chamber increases. The slide is moved to the suction unloading. It reduces starting torque and acceleration side. The cooling capacity increases. times considerably. This not only puts lower stresses on motor and mechanical parts but also reduces the If the valve CR1, CR2 or CR3 is opened, the pressure load on the power supply network. - Page 5 AE4-1322 there is no need to move the slide. No solenoid valve Decreased cooling demand Decreased cooling demand Decreased cooling demand Decreased cooling demand Decreased cooling demand is energized. A decreased cooling demand falls below the lower set The control input can be the air or water temperature at point (operating point C).
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Page 6: Oil Circulation
AE4-1322 Figure 4 Infinite capcity control scheme 2.8 Oil circulation 2.8 Oil circulation 2.8 Oil circulation 2.8 Oil circulation 2.8 Oil circulation and flows back into the compressor either direct or via The lubrication circuit is designed as is typical for an external oil cooler. -
Page 7: Lubricants
AE4-1322 • For circuits with with with with refrigerant injection for additional with cooling and / or for greater system volumes: Direct monitoring by means of an oil level monitor in the oil separator(optional accessory) is recom- mended. 3 Lubricants 3 Lubricants 3 Lubricants 3 Lubricants... -
Page 8: System Layout
AE4-1322 4.2 System layout 4.2 System layout 4.2 System layout 4.2 System layout 4.2 System layout Oil heater Oil heater Oil heater Oil heater Oil heater The compressor is installed in the refrigerating circuit An oil heater is provided to prevent too high a concen- similar to semi-hermetic reciprocating compressors. -
Page 9: Guidelines For Special System Variations
AE4-1322 accumulator is recommended to protect against liquid Expansion valve and evaporator Expansion valve and evaporator Expansion valve and evaporator Expansion valve and evaporator Expansion valve and evaporator slugging. To effectively avoid increased oil carry-over (such as due to a rapid decrease of pressure in the oil Expansion valve and evaporator have to be adjusted separator), the oil temperature must remain at least using utmost care. -
Page 10: Copeland Corporation
AE4-1322 Figure 7 Liquid injection valve (system design) Pipe runs Pipe runs Pipe runs Pipe runs Pipe runs • With the selection software • Consider the most extreme conditions to be To ensure a bubble free liquid supply to the liquid expected during actual operation: injection valve, the connection must be made on the - min. -
Page 11: Cooler
AE4-1322 3.5 Additional cooling by means of external oil 3.5 Additional cooling by means of external oil 3.5 Additional cooling by means of external oil 3.5 Additional cooling by means of external oil 3.5 Additional cooling by means of external oil •... -
Page 12: Economizer Operation
AE4-1322 Thermosyphon oil cooling (cooling by refrigerant) Thermosyphon oil cooling (cooling by refrigerant) Thermosyphon oil cooling (cooling by refrigerant) Thermosyphon oil cooling (cooling by refrigerant) Thermosyphon oil cooling (cooling by refrigerant) Temperature control either by thermostatic regulation valve for refrigerant feed or by-pass valve (see table for set point;... -
Page 13: Operation Principal
AE4-1322 5.2 Operation principle 5.2 Operation principle 5.2 Operation principle 5.2 Operation principle 5.2 Operation principle 5.3 Economizer operation with sub-cooling circuit 5.3 Economizer operation with sub-cooling circuit 5.3 Economizer operation with sub-cooling circuit 5.3 Economizer operation with sub-cooling circuit 5.3 Economizer operation with sub-cooling circuit With screw compressors the compression process With this operation mode a heat exchanger is utilized... -
Page 14: Layout And Selection Recommendations
AE4-1322 5.5 Layout and selection recommendations 5.5 Layout and selection recommendations 5.5 Layout and selection recommendations 5.5 Layout and selection recommendations 5.5 Layout and selection recommendations • Pipe vibrations: Due to the pulsations emitting from the profile area Pipe layout Pipe layout Pipe layout Pipe layout... -
Page 15: Control
AE4-1322 Thermostatic expansion valves Thermostatic expansion valves Thermostatic expansion valves Thermostatic expansion valves Thermostatic expansion valves The compressors are supplied as standard with part winding motors of connection (Part Winding “PW”). • Valve layout for liquid sub-cooler: Start delta motors are available as special design. Basis is the sub-cooling capacity Evaporating temperature corresponds to the Part winding motors... -
Page 16: Selection Of Electrical Components
AE4-1322 Figure 18 Power factor correction on individual compressors 6.2 Selection of electrical components 6.2 Selection of electrical components 6.2 Selection of electrical components 6.2 Selection of electrical components 6.2 Selection of electrical components Power factor correction Power factor correction Power factor correction Power factor correction Power factor correction... -
Page 17: Compressor Protection System
AE4-1322 • For part winding start a separate capacitor should The layout of correction systems for motors with be used for each half of the winding (50% each). direct starting is similar. Only one capacitor is used for start delta motors (parallel to contactor K1). -
Page 18: Schematic Wiring Diagrams
AE4-1322 • Direction of rotation/phase sequence (direct mea- surement at compressor terminals) CAUTION CAUTION CAUTION CAUTION CAUTION Immediate interruption of control current and Make sure that the rotation monitoring is Make sure that the rotation monitoring is Make sure that the rotation monitoring is Make sure that the rotation monitoring is Make sure that the rotation monitoring is lock-out with wrong direction of rotation / phase... - Page 19 AE4-1322 Fault reset “oil level” Thermal overload “motor” PW2 Screening unit (if required, such as from Murr Signal lamp “motor fault” (over temp / phase Elektronik) failure) SV “capacity control” * Signal lamp “oil level fault” Contactor “first PW” (for PW) “Mains contactor” SV “capacity control”...
- Page 20 AE4-1322 Figure 22 Part winding start with 4-step capacity control Figure 23 Part winding start options © 2002 Copeland Corporation Issued 4-2002 Printed in U.S.A.
- Page 21 AE4-1322 Data for accessories and oil charge Data for accessories and oil charge Data for accessories and oil charge Data for accessories and oil charge Data for accessories and oil charge Liquid sub-cooling Liquid sub-cooling Liquid sub-cooling Liquid sub-cooling Liquid sub-cooling •...
- Page 22 Further window: application limits diagram for ECO. clipboard). Copeland is a registered trademark and Copeland Screw is a trademark of Copeland Corporation. The © 2002 Copeland Corporation Emerson Climate Technologies logo is a trademark and Issued 4-2002 service mark of Emerson Elelctric Co. Printed in U.S.A.