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Emerson AE4-1287 R7 Manual

Copeland discus demand cooling
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AE4-1287 R7
Section
Safety
Safety Instructions ...................................................2
Safety Icon Explanation ...........................................2
Shock, Fire, or Injury to Persons ...........................3
Safety Statements ...................................................3
Introduction ...............................................................4
Operating Range .....................................................4
Demand Cooling System Design .............................4
Demand Cooling™ Compressors ............................5
Condenser Sizing ....................................................5
System Information ..................................................6
Unloading ..............................................................6
Cooling ..................................................................6
Performance Adjustment Factors ............................7
Demand Cooling Specifi cations ...............................7
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
Application Engineering
Application Engineering
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Demand Cooling
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Section
Figures and Tables
Demand Cooling System .........................................7
R-407F..................................................................8
65°F Return Gas (with Head Fan) .........................8
Demand Cooling System Diagram ..........................9
Demand Cooling Wiring Schematics ............... 10-12
Control Actions ....................................................13
Demand Cooling Kit Part Numbers .......................13
Factors for HCFC-22 ...........................................14
Adjustment Factors for HCFC-22 ........................14
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Summary of Contents for Emerson AE4-1287 R7

  • Page 1: Table Of Contents

    4D and 6D Unloading with Demand Cooling ...6 3D Copeland Discus Digital™ with Demand Appendix - Demand Cooling Diagnostics ..15-18 Cooling ..............6 Performance Adjustment Factors ......7 Demand Cooling Specifi cations .......7 © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 2: Safety Instructions

    NOTICE NOTICE is used to address practices not related to personal injury. CAUTION, without the safety alert symbol, is used to address practices CAUTION not related to personal injury. © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 3: Instructions Pertaining To Risk Of Electrical Shock, Fire, Or Injury To Persons

    • Refrigerant compressors must be employed only for their intended use. • install, commission and maintain this equipment. • • All valid standards and codes for installing, servicing, and maintaining electrical and refrigeration equipment must be observed. © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 4: Introduction

    Demand Cooling System Design excessive system pressure fl uctuation occurs during injection valve cycling. Normally, pressure fl uctuations When Demand Cooling operates, it “diverts” © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 5: Demand Cooling™ Compressors

    In order to avoid nuisance trips, a one minute 65 °F return gas. time delay is provided before alarm after a continuous © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 6: System Information

    Always install a liquid line fi lter dryer in the need for added cooling. The Demand Cooling © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 7: Performance Adjustment Factors

    "Online Product Information" at www.emersonclimate.com. As a 3D Copeland Discus Digital™ with Demand Cooling general rule of thumb, Emerson Climate Technologies Demand Cooling can be used with 3D Discus ™ recommends assuming that HFC-407A, HFC-407C and...

  • Page 8: Low Temperature Operating Envelope With Demand Cooling For R-407A, R-407C And R-407F

    *If Liquid Injec on Is Not Installed, Recommend 265°F MAX Discharge Line Temp. Limit Evapora ng Temperature (°F) Figure 3 – Low Temperature Operating Envelope for R-22 at 65°F Return Gas (with Head Fan) © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 9: Demand Cooling System Diagram

    MANUAL SHUTOFF CONDENSER LINE FILTER SENSOR LINES VALVE RECEIVER LIQUID LINE FILTER DRIER COMPRESSOR SIGHT GLASS INJECTION SOLENOID VALVE EVAPORATOR SUCTION LINE FILTER ACCUMULATOR Figure 4 Demand Cooling System Diagram © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 10: Demand Cooling Wiring Schematics

    Temp. and the Sentronic are Sensor deenergized when the Injection compressor is not running! Solenoid Electronic Switch L1 L2 Figure 5B Demand Cooling Wiring Schematic less Sentronic Oil Pressure Control © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 11: Printed In The U.s.a

    Demand Cooling Module Demand Sentronic and the Sentronic are Cooling Oil Pressure deenergized when the Module Control compressor is not running! Figure 5D Demand Cooling Wiring Schematic with Isolated Control Contacts © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 12: Printed In The U.s.a

    Module Terminal Strip 120v 240v Current Sensor Connector Demand Cooling Module Current Sensor Control Temp. Sensor Injector Control Injection Switch Solenoid Contactor Figure 5E Coresense Protection with Copeland Demand Cooling © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 13: Demand Cooling Operating Setpoints And Control Actions

    2D and 3D Models 998-0700-09 4D and 6D Models 998-0700-10 Temperature Sensors 3ft. Shielded Cable (Standard) 085-109-00 10ft. Shielded Cable (Optional) 085-109-01 ¹ 4D*X, 4D*N, 6D*X, 6D*N Indicate Discus III Models © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 14: Demand Cooling Evaporator Capacity Adjustment Factors For Hcfc-22

    Emerson Climate Technologies, Inc. and/or its affi liates (collectively "Emerson"), as applicable, reserve the right to modify the design or specifi cations of such products at any time without notice. Emerson does not assume responsibility for the selection, use or maintenance of any product.

  • Page 15: Appendix - Demand Cooling Diagnostics

    75663 and the metal end of the Demand Cooling sensor probe together with electrical tape or “Velcro”. The end of the probe and the end of the thermometer must touch. © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 16: Printed In The U.s.a

    This proves solenoid operation. Retighten the deenergized. This voltage is much less than the magnet housing cover screw after this check. control voltage which is measured when the switch © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 17: Printed In The U.s.a

    Figure 1 then go to Step 5. operation. If the suction pressure rises then go to If they are much higher the system should be Step 6. corrected to lower the temperatures or there may © 2012 Emerson Climate Technologies, Inc. Printed in the U.S.A.

  • Page 18: Printed In The U.s.a

    6. If the suction pressure rises, the suction service valve may not be entirely closed, the valve plate Note! Table 2 is for HCFC-22. Emerson Climate or valve plate gasket may have been damaged. Technologies recommends assuming that...

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