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© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE4-1395
Application Engineering
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3 to 15 Ton Copeland Scroll Digital
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Compressors for Air Conditioning
AE4-1395
August 2012
Application Engineering
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Safety
Safety Instructions .................................................2
Safety Icon Explanation ........................................2
Instructions Pertaining to Risk of
Electrical Shock, Fire, or Injury to Persons ........... 3
Safety Statements .................................................3
I
ntroduction
Nomenclature .......................................................4
Digital Compressor Operation .............................. 4
How It Works .......................................................4
Application Considerations
Operating Envelope ..............................................4
Solenoid Valve and Coil ........................................5
Pressure Fluctuations ...........................................5
Piping ....................................................................5
Start Up and Shut Down ....................................... 5
Compressor Cycling ..............................................5
Sound Characteristics ...........................................5
Internal Pressure Relief (IPR) Valve ...................... 5
High Pressure Control ...........................................5
Low Pressure Control ............................................5
Scroll Temperature Protection ............................... 6
Crankcase Heaters ...............................................6
Oil Type and Oil Removal ..................................... 6
Power Factor .........................................................6
Tandem Applications .............................................6
Modulation Control ................................................7
Application Tests
Oil Level Verification ..............................................7
Excessive Liquid Floodback Tests ......................... 7
Operating Envelope Tests ..................................... 7
Digital Compressor Retrofit Applications
Reasons to Retrofit ................................................. 7
Retrofit Applications To Avoid .................................. 8
Performance Modeling ............................................ 8
System Modifications .............................................. 8
Compressor Selection & Change-Out ................... 8
Refrigerant Flow Control ....................................... 9
Evaporator Air Flow ............................................... 9
Condenser Air Flow ............................................... 9
Modulation Control ................................................ 9
Assembly Line Procedures
3 To 7.5 Ton Modulation Valve Brazing Procedure ...9
Pressure Testing ......................................................9
Service Procedures
Modulation Troubleshooting ...................................10
3 to 7.5 Ton Modulation Valve Replacement
Procedure ...............................................................10
8 To 15 Ton Modulation Valve Replacement
Procedure ...............................................................10
Scroll Compressor Functional Check .....................11
Figures & Tables
Digital Cycle Example ............................................12
3 to 7.5 Ton Digital Scroll Cross Sectional View .....12
8 to 15 Ton Digital Scroll Cross Sectional View ......13
3-7.5 Ton Operating Envelope ................................14
8-15 Ton Operating Envelope .................................14
Compressor Capacity Graph ..................................15
Discharge Thermistors ...........................................15
3 to 7.5 Ton Modulation Valve Piping .....................16
3 To 7.5 Ton Tandem ..............................................16
Modulation Troubleshooting ...................................17
Copeland Scroll Digital Family Features ................18
Refrigerant Charge Limits ......................................18
Torque Values .........................................................18
Compressor Accessories .......................................19
TABLE OF CONTENTS
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