Johnson Controls DSH024C Installation Manual
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Johnson Controls DSH024C Installation Manual

Air conditioning units c-generation smart equipment controller
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Model DSH024C–120C Horizontal R-410A
Air Conditioning Units C-Generation
Smart Equipment Controller
Installation Guide
Issue date: 2021-03-22
Johnson Controls
Form number: 145.32-IOM5 (321)
Supersedes: 145.32-IOM5 (1220)

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Summary of Contents for Johnson Controls DSH024C

  • Page 1 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Installation Guide Form number: 145.32-IOM5 (321) Issue date: 2021-03-22 Supersedes: 145.32-IOM5 (1220) Johnson Controls...
  • Page 2 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 3: Table Of Contents

    Air temperature sensors........................39 Variable frequency drive (VFD)......................39 Indoor fan VFD............................40 Outdoor fan VFD (208-230V and 460V only)..................40 Hot gas bypass (HGBP)........................41 Adjusting HGBP setpoint......................... 41 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 4 Refrigerant circuits..........................49 Blowers............................... 49 Drive belts............................49 Filters..............................49 Appendix A: Wiring diagrams........................51 Appendix B: SEC parameters for DSH024C–DSH120C units..............58 R-410A Quick reference guide........................63 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 5: General Safety Guidelines

    Note: Highlights additional information useful to the technician in completing the work being performed properly. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 6: Changeability Of This Document

    Cabinet Added a DANGER warning to the Cabinet Configuration configuration May 2020 Options section. options Nomenclature Updated Nomenclature November 2020 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 7: Associated Literature

    If Technical Support is required, please contact the Product Technical Support team at 877-329-7430 or AppliedDXTechSupport@jci.com. Replacement parts For replacement parts, please contact your local Source1 Dealer. Source1 Parts Phone Number: 800-536-6112 Source1 Parts Website: http://www.source1parts.com Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 8: Nomenclature

    Evaporator motor VFD standard on 8 ton units and up. Condenser VFD not available in 575V. Evaporator motor without VFD available only on 2, 3, 4 and 5 ton. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 9: Installation

    Prior to mounting unit, check individual unit weights (Table 1 on page 11) and verify lifting capacity of lifting equipment exceeds weight of units by safe margins. Failure to do so may result in unit damage, personal injury, or even death. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 10: Rigging

    Units 2–8 tons can be ordered from the factory as either packaged or split. The 10 ton unit only comes factory-split. Here are examples of cabinet configurations. See Nomenclature for other available options: Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 11: Unit Mounting

    Before assembling and piping the units, remove the tiedown straps and brackets from the refrigerant piping and couplings. See Figure 1 (8 and 10 ton models are shown). Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 12: Separation Of The Units

    All models can be ordered with refrigerant shut-off valves or couplings. These components allow the evaporator and condenser sections to ship factory-split. The evaporator and condenser can then be assembled onsite without requiring the entire unit refrigerant charge be reclaimed. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 13: Separating The Units

    For 2–5 ton models, close all of the refrigerant isolation valves on the suction, liquid, and hot gas bypass line (if applicable). Valves are not a backseating design. Caps are wrench tight. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 14 DSH120C***S with HGBP DSH120B-SPLIT-HGBP Note: The couplings must be protected from any foreign material, dust, or debris if they are left uncapped for any extended period of time. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 15 Figure 4: Single compressor unit – typical installation configuration Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 16 Figure 5: Dual compressor unit – typical installation configuration Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 17: Interconnecting Refrigerant Tubing

    During brazing operations, flow an inert gas such as nitrogen through the system to prevent internal scaling and contamination. If the piping is properly sized, traps are not required. They only increase the pressure drop across the system, further reducing capacity. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 18 Liquid line Suction line DSH024C DSH036C DSH048C DSH060C DSH096C 2 X 1/2 2 X 7/8 DSH120C 2 X 1/2 2 X 7/8 Note: Measurements are in inches Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 19: Dimensional Data

    Dimensional data Figure 6: DSH024C and DSH036C dimensional data: 2–3 ton horizontal A/C unit Note: Dimension tolerance is 1/16 in. Evaporator and condenser duct connections cannot be altered unless noted. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller...
  • Page 20 Figure 7: DSH048C and DSH060C dimensional data: 4–5 ton horizontal A/C unit Note: Dimension tolerance is 1/16 in. Evaporator and condenser duct connections cannot be altered unless noted. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 21 Figure 8: DSH096C dimensional data: 8 ton horizontal A/C unit Note: Dimension tolerance is 1/16 in. Evaporator and condenser duct connections cannot be altered unless noted. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 22 Figure 9: DSH120C dimensional data: 10 ton horizontal A/C unit Note: Dimension tolerance is 1/16 in. Evaporator and condenser duct connections cannot be altered unless noted. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 23: Typical Service Clearances

    Typical service clearances Figure 10: 2–5 ton horizontal A/C unit service clearances Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 24 Figure 11: 8–10 ton horizontal A/C unit service clearances Note: 8 ton packaged unit shown. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 25: Unit Corner Weights

    Table 4: Packaged unit installation Point weights (lbs) Total Unit Operat Shippi 2 ton 3 ton 4 ton 1010 5 ton 1060 8 ton 1470 1560 Figure 13: Split unit installation Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 26: Ductwork

    Note: As a general rule, these velocities require an intake louver sized approximately 1.25 to 1.5 times the dimensions of the duct connection on the unit, and a discharge louver sized approximately 1.5 to 2 times the duct connection dimensions Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 27: Electrical Wiring

    For low voltage thermostat wiring, an 18 gauge wire can be used for up to 100 foot lengths. A single or multiple stage thermostat (up to four cooling stages) must be used depending on size of Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 28: Typical Wiring Schematics

    Follow the manufacturer's instructions enclosed with the thermostat for the general installation procedure. Use the seven color-coded, insulated wires to connect the thermostat to the unit. Typical wiring schematics Figure 14: Typical control diagram for single stage cooling (DSH024C, DSH036C, DSH048C, and DSH060C) Note: Unit is capable of supporting up to two stages of discrete heating.
  • Page 29 OCC is an output from the thermostat to indicate the occupied condition. X is an input to thermostat to display the error status. Jumper is required if no option is installed between SD-24 and SD-R. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 30 OCC is an output from the thermostat to indicate the occupied condition. X is an input to thermostat to display the error status. Jumper is required if no option is installed between SD-24 and SD-R. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 31 Evaporator fan Condenser fan Max fuse / Model number Voltage CCT.BKR. DSH120C2 208-230/3/60 16.2 110.0 3.00 58.95 DSH120C4 460/3/60 52.0 3.00 27.9 DSH120C5 575/3/60 38.9 3.00 20.63 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 32: Fan Performance

    Blower performance includes evaporator coil and 2-inch filters. At higher evaporator airflows and wet bulb conditions, condensate carry-over may occur. Decrease airflow downward as necessary. Field supplied low static drive. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 33 Blower performance includes evaporator coil and 2-inch filters. At higher evaporator airflows and wet bulb conditions, condensate carry-over may occur. Decrease airflow downward as necessary. Field supplied low static drive. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 34 616 1.37 664 1.54 709 1.72 753 1.90 795 2.08 835 2.27 874 2.46 911 2.66 948 2.86 983 3.06 4800 660 1.72 704 1.91 747 2.10 788 2.29 827 2.49 865 2.69 902 2.90 938 3.11 Note: Blower performance includes evaporator coil and 2-inch filters. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 35: Motor And Pulley Data

    Drive range motor pulley pulley Model (RPM) Pitch diameter Pitch diameter Frame size Efficiency % (inches) (inches) DSH024C 442–652 2.0–3.0 DSH036C 503–743 0.75 2.0–3.0 DSH048C 470–694 88.5 2.0–3.0 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 36: Blower Speed Adjustment

    (see Figure 17 on page 35). Determine the damper position by the refrigerant pressure. Depending on a proportional pressure control module's output signal, a direct-coupled electric damper actuator motor drives the damper open or closed. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 37 DSH048C/060C 27.875 inches 5.0 inches 26.625 inches LADK-100C-1 DSH096C 48.0 inches 5.0 inches 29.25 inches LADK-120C-1 DSH120C 60.75 inches 5.0 inches 29.125 inches Figure 17: Low ambient damper Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 38: Airside Economizer (Ase)

    The control determines the type of free cooling changeover based on which sensors are present and reliable. Conditions include: • Return and outside air dry bulb = dry bulb changeover Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 39: Air Temperature Sensors

    The location of the sensor has to be chosen according to local codes and installation practices. Figure 18: RAT SAT sensor Figure 19: Extension wiring Variable frequency drive (VFD) This section discusses variable frequency for only 8 and 10 ton units. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 40: Indoor Fan Vfd

    The field installed kit comes complete with a manual bypass electrical circuit. In the unlikely case of VFD failure, it can be used to revert condenser fan control back to standard starter mode. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 41: Hot Gas Bypass (Hgbp)

    HGBP valve closes at the chosen setpoint. The pressure of the evaporator coil is set to maintain an evaporator coil temperature above the point that frost and coil freeze-up can form. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 42: Start-Up And Operation

    Note: Always charge with liquid when adding R-410A refrigerant. Failure to do so compromises the properties of the refrigerant being added to the rooftop unit and results in substandard performance of the unit. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 43: Checking Superheat And Subcooling

    Liquid Line Subcooling = Saturation Temperature (108.0°F) minus Liquid Line Temperature (95.0°) = 13.0°F Subcooling should be 10.0–14.0°F at design conditions. Table 27: R-410A pressure and temperature chart PSIG Temp °F PSIG Temp °F Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 44 If leak checking a unit charged with R-410A, ensure the leak test device is capable of sensing refrigerant R-410A. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 45: Startup (Cooling)

    These features allow the user to quickly navigate the menus that display the unit status, options, current function, supply, return and outdoor temperatures, fault codes, and other information. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 46 As lead-lag function must be turned OFF, Y1 input energizes the C1 output when the compressor #1 ACSD is at 0 and all refrigerant safety devices are closed (default 5 minutes). Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 47 2–10 VDC output from VFD terminal on UCB operates the supply fan VFD proportional to the minimum and maximum frequency settings of the VFD (the defaults are 30–60hz) Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 48 With a demand for cooling, the VFD operates at the frequency relating to the setpoint Occupied, # Stage of Cool % Command as defined under the Indoor Fan setting menu on the SE controller. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 49: Maintenance And Service

    To maintain optimum airflow performance, ensure the replacements are of the same type. See Table 31 for filter sizes. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 50 4 / 20 x 16 x 2 DSH120C 4 / 20 x 16 x 2 Figure 20: Belt tension adjustment Pounds force Cross section Minimum Maximum 1-1/2 2-1/2 3-1/2 6-1/2 5-1/2 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 51: Appendix A: Wiring Diagrams

    Appendix A: Wiring diagrams Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 52 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 53 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 54 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 55 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 56 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 57 Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 58: Appendix B: Sec Parameters For Dsh024C-Dsh120C Units

    Appendix B: SEC parameters for DSH024C– DSH120C units Table 32: SEC parameters for DSH024C-060C units with single speed evaporator fan Menu/sub-menu Parameter Factory value Standard T-Stat Only Commission # Refrig Sys Options # Ht Pump Stgs Occ Mode External Off Dur Unocc...
  • Page 59 #HtgStgs 0 (# of Heating Stages) Note: Factory shipped units equipped with Occ jumper on UCB Field set parameter Do not enable low ambient Do not enable LeadLag Field supplied option Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 60 #HtgStgs 0 (# of Heating Stages) Note: Factory shipped units equipped with Occ jumper on UCB Do not enable low ambient Do not enable LeadLag Field supplied option Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 61 #HtgStgs 0 (# of Heating Stages) Note: Factory shipped units equipped with Occ jumper on UCB Field set parameter Do not enable low ambient Do not enable LeadLag Field supplied option Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 62 #HtgStgs 0 (# of Heating Stages) Note: Factory shipped units equipped with Occ jumper on UCB Do not enable low ambient Do not enable LeadLag Field supplied option Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...

  • Page 63: R-410A Quick Reference Guide

    Never open system to atmosphere when under vacuum. • If system must be opened for service, evacuate system then break the vacuum with dry nitrogen, and replace filter driers. Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller Johnson Controls...
  • Page 64 © 2021 Johnson Controls. All rights reserved. Subject to change without notice. 100 JCI Way, York, Pennsylvania USA 17406-8469. Johnson Controls...

This manual is also suitable for:

Dsh096Dsh120cDsh036c seriesDsh048c seriesDsh060c series

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