Trane Precedent DHJ150A Installation, Operation And Maintenance Manual
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Trane Precedent DHJ150A Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance
Packaged Rooftop Air
Conditioners
Precedent™ Heat Pump
High Efficiency
12.5 to 25 Tons — 60 Hz
Model Numbers: WHJ150A - WHJ300A, DHJ150A - DHJ300A
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment
can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or
serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
April 2023
SAFETY WARNING
PKGP-SVX011B-EN

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  • Page 1 Installation, Operation, and Maintenance Packaged Rooftop Air Conditioners Precedent™ Heat Pump High Efficiency 12.5 to 25 Tons — 60 Hz Model Numbers: WHJ150A - WHJ300A, DHJ150A - DHJ300A SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
  • Page 2 (HCFCs). Not all refrigerants containing these compounds bump cap, fall protection, electrical PPE and arc have the same potential impact to the environment. Trane flash clothing). ALWAYS refer to appropriate advocates the responsible handling of all refrigerants.
  • Page 3 This document and the information in it are the property of serious injury and equipment or property damage. Trane, and may not be used or reproduced in whole or in Do not store or use gasoline or other flammable part without written permission. Trane reserves the right to...
  • Page 4 Table of Contents Model Number Description ....6 Phase Monitor ......11 General Information .

  • Page 5: Table Of Contents

    Table of Contents Pre-Start ........34 Coil Cleaning Procedure .
  • Page 6 Model Number Description Digit 1 — Unit Function Digit 18 — Through-the-Base Provisions Digit 12, 13 — Service Sequence W = Packaged Heat Pump ** = Factory Assigned 0 = No Through-the-Base Provisions D = Dual Fuel Heat Pump A = Through-the-Base Electric B = Through-the-Base Gas Piping Digit 14 —...
  • Page 7 Model Number Description Digit 25— System Monitoring Controls 0 = No Monitoring Control 1 = Clogged Filter Switch 2 = Condensate Overflow Switch 3 = Discharge Air Sensing Tube 4 = Clogged Filter Switch and Condensate Overflow Switch 5 = Clogged Filter Switch and Discharge Air Sensing Tube 6 = Condensate Overflow Switch and Discharge Air Sensing Tube...
  • Page 8 General Information Unit Inspection Note: Do not use the unit’s heater for temporary heat without first completing the start-up. To protect against loss due to damage incurred in transit, The manufacturer will not assume any responsibility for perform inspection immediately upon receipt of the unit. equipment damage resulting from condensate Check carefully for shipping damage.
  • Page 9 General Information Compressor Nameplate controller if the pressure differential across the filters is at least 0.5 inch w.c. The contacts will automatically open The nameplate for the compressors are located on the side when the pressure differential across the filters decreases of the compressor.
  • Page 10 This sensor features single setpoint capability and timed required to restart the compressor. override with override cancellation. It is used with a Trane Integrated Comfort™ building management system. High Pressure Control Remote Zone Sensor (BAYSENS016*) The high pressure controls are wired in series between the compressor outputs on the Symbio™...
  • Page 11 General Information Touch Screen Programmable Zone Notes: Sensor (BAYSENS800) • The supply air smoke detector samples supply air. The return smoke detectors sample return This sensor uses a BACnet® MS/TP link to communicate air. The smoke detectors are designed to shut zone temperature and setpoints.
  • Page 12 Pre-Installation WARNING • Use a NIOSH approved dust/mist respirator. • Avoid contact with the skin or eyes. Wear long-sleeved, Fiberglass Wool! loose-fitting clothing, gloves, and eye protection. Exposure to glass wool fibers without all necessary • Wash clothes separately from other clothing: rinse PPE equipment could result in cancer, respiratory, washer thoroughly.
  • Page 13 Dimensional Data Figure 2. 12.5 to 15 tons high efficiency INDOOR TOP PANEL COMPRESSOR SECTION CONTROL BOX SECTION ACCESS PANEL ACCESS PANEL EVAPORATOR SECTION OUTDOOR TOP PANEL ACCESS PANEL 3/4 NPT GAS CONNECTION 2" ELECTRICAL CONN SINGLE POINT POWER "T" MODELS ONLY CONDENSATE DRAIN 59"...
  • Page 14 Dimensional Data Figure 4. 12.5 to 25 tons high efficiency – downflow airflow supply/return, through-the-base utilities 7" 14 3/8" 40" 19 3/8" 177 MM 365 MM 1002MM 488MM 6 5/8'' 167 MM 14 7/16" 365MM 73 5/8" 65" 1868MM 1652MM 8 3/8"...
  • Page 15 Dimensional Data Figure 6. 12.5 to 25 tons high efficiency – power exhaust 22.7 21.4 Figure 7. 12.5 to 25 tons high efficiency – unit clearance and roof opening CLEARANCE 36” 914 MM UNIT OUTLINE CLEARANCE 68” 1727 MM CLEARANCE FORM TOP OF UNIT 72”...
  • Page 16 Dimensional Data Figure 8. 12.5 to 25 tons high efficiency – roof curb 116 7/8” 1” 2969 MM 25 MM 1 13/16” 1” 46 MM 25 MM 1 1/2” (38 MM) PERIMETER 22 1/4” CURB FLANGE 565 MM 23 1/4” 1”...
  • Page 17 Dimensional Data Figure 10. 12 to 25 tons duel fuel high efficiency - gas pipe height Note: Height of gas pipe required from inside unit base to gas shut off assembly (factory provided). Dimension A Model inch DHJ (150 – 300)A 1 3/6 Clearances capacity, and peak operating efficiency.
  • Page 18 Dimensional Data Weights Table 1. Model weights, corner weights (lbs) and center of gravity dimensions (in.) Model Weights Corner Weights Center of Gravity (in.) Tons Unit Model No. Shipping Length Width 12.5 WHJ150 2225 2005 WHJ180 2246 2026 WHJ240 2403 2183 WHJ300 2405...
  • Page 19 Dimensional Data Table 2. Factory installed options (FIOPS)/accessory net weights (lb) (continued) W/D*J150-180 W/D*J240-300 Accessory 12.5, 15 Tons 20, 25 Tons Stainless Steel Heat Exchanger Through-the-Base Electrical Through-the-Base Gas Unit Mounted Circuit Breaker Unit Mounted Disconnect Notes: Weights for options not listed are less than 5 pounds. Net weight should be added to unit weight when ordering factory-installed accessories.
  • Page 20 Installation Ductwork WARNING Heavy Object! Supply and return air openings as viewed from the rear of the unit are shown in the following drawings. Failure to follow instructions below could result in unit dropping which could result in death or serious Figure 14.
  • Page 21 Installation Table 3. Clearance required from duct to combustible Note: For sound consideration, cut only the holes in the surfaces roof deck for the ductwork penetrations. Do not cut out the entire roof deck within the curb perimeter. Clearance required from duct to Model Number If a Curb Accessory Kit is not used: combustible surfaces (inches)
  • Page 22 Installation uniform lift. The minimum distance between the lifting • Install and connect a condensate drain line to the hook and the top of the unit should be 7 feet. evaporator drain connection. 5. Test-lift the unit to ensure it is properly rigged and Factory Installed Economizer balanced, make any necessary rigging adjustments.
  • Page 23 Installation Figure 18. Vent hood shipping location If any of the units are installed in the downflow discharge configuration and have the alternate TCO1 limit switch provided, remove the additional TCO1 limit switch which is attached to the installed TCO1 limit switch (12.5 to 25 tons) and discard.
  • Page 24 Installation Figure 20. TCO1 instructions Additional TCO1 limit switch to be used for horizontal discharge field conversion Location of TCO1 limit to be installed DHJ(150-300)A (12.5 to 25 Ton Units) Note: The TCO1 switch is attached by two screws in the Figure 21.
  • Page 25 Installation Air-Fi® Wireless Communication Note: Refer to horizontal views below of the 12.5 to 25 ton units. Interface Figure 22. Horizontal bracket installation (top view of The factory installed wireless communications interface is unit) installed in the downflow discharge position. If a unit is to be converted to horizontal discharge, the following conversion must be performed: 1.
  • Page 26 Important: All phases of this installation must comply with or other energy storing components provided by NATIONAL, STATE, and LOCAL CODES. In Trane or others, refer to the appropriate absence of local codes, the installation must manufacturer’s literature for allowable waiting periods conform with American National Standard- for discharge of capacitors.
  • Page 27 Installation Figure 27. Through-the-base gas pipe assembly for DHJ(150-300)A Grommet 3/4" x 8 1/2" Pipe Nipple Grommet 90 Elbow 3/4" x 6 1/2" Pipe Nipple SEE DETAIL A 90 Street Elbow Support Plate Gas Shut-off Valve 3/4" x 2 1/2" Pipe Nipple 3/4"...
  • Page 28 Installation Figure 28. Condensate trap installation wiring is properly sized and installed, follow the following guidelines. Verify that the power supply available is compatible with the unit’s nameplate ratings. The available supply power must be within 10% of the rated voltage stamped on the nameplate.
  • Page 29 Installation Optional TBUE Wiring (Through-the- An overall layout of the various control options available with the required number of conductors for each control Base Electrical Option) device is illustrated in the wiring diagram located on main Location of the applicable electrical service is illustrated control box door.
  • Page 30 Installation Figure 29. Low voltage wiring — D cabinet Figure 30. Main control panel low voltage wiring Table 7. Recommended wire lengths Table 7. Recommended wire lengths (continued) Maximum recommended wire Maximum recommended wire Wire Size length from unit controller to Wire Size length from unit controller to sensor...
  • Page 31 Installation Controls using DC Analog Input/Outputs Table 8. Zone sensor module wiring (continued) (Standard Low Voltage Multi conductor Distance from Unit to Control Recommended Wire Size Wire) 18 gauge 241 -385 feet Before installing any connecting wiring between the unit 73.5 - 117.3 m 0.75 mm and components utilizing a DC analog input\output signal,...
  • Page 32 Installation Figure 31. Examples Note: Wiring pin numbers are for reference only. There are Table 9. Temperature vs. resistance (continued) multiple smoke detector systems that could have Temperature differently numbered pins. For correct wiring details, Nominal Resistance please refer to the specific smoke detector literature (kOhms) Degrees °F Degrees °C...
  • Page 33 Installation Table 9. Temperature vs. resistance (continued) Table 11. Iron pipe size (SI) millimeters Temperature Iron Pipe Size (SI) Millimeters Nominal Resistance (kOhms) Degrees °F Degrees °C Length of 15 mm 20 mm 25 mm 32 mm 40 mm Pipe Pipe Pipe Pipe...

  • Page 34: Pre-Start

    Pre-Start Use the checklist provided below in conjunction with the Excessive three phase voltage imbalance between phases “General Unit Requirements” checklist to ensure that the will cause motors to overheat and eventually fail. The unit is properly installed and ready for operation. maximum allowable voltage imbalance is 2 percent.

  • Page 35: Compressor Crankcase Heaters

    Pre-Start Compressor Crankcase Heaters WARNING Hazardous Voltage w/Capacitors! Each compressor can be equipped with a crankcase heater (On some units the crankcase heater comes standard). Failure to disconnect power and discharge capacitors The proper operation of the crankcase heater is important before servicing could result in death or serious to maintain an elevated compressor oil temperature during injury.
  • Page 36 Pre-Start appropriate outputs. A user-selected timeout value will configuration, see ACC-APG002*-EN, Symbio™ 700 for determine how long the controller will remain in any given Precedent Packaged Rooftop Air-Conditioners Application state once initiated. For detailed information on how each Guide. Service Test State is interpreted based on the equipment’s Figure 33.

  • Page 37: Unit Start-Up

    Unit Start-Up Sequence of Operation energizes the indoor blower at the end of the selected indoor blower delay off See ACC-APG002*-EN, Application Guide, Symbio™ 700 Note: For complete Gas Heat User information, Operation, Controller with Precedent™ Packaged Rooftop Air- Start-up, Shutdown and Maintenance refer to “Gas Conditioners.

  • Page 38: Compressor Start-Up

    Unit Start-Up Compressor Start-Up 1. Clamp an amp meter around one of 1st stage heater power wires at the heater contactor. WARNING 2. Using the Service Test Guide in Figure 33, p. Live Electrical Components! continue the SERVICE TEST start-up procedure for each compressor circuit.

  • Page 39: Maintenance

    Maintenance Condensate Overflow Switch WARNING Hazardous Service Procedures! During maintenance, the switch float (black ring) must be checked to ensure free movement up and down. Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or Cooling Season serious injury.

  • Page 40: Coil Cleaning

    Maintenance terminal connections, as well as damaged wire 2. Protect all electrical devices such as motors and insulation. Make any necessary repairs. controllers from any over spray. • Verify that the electric heat system operates properly. 3. Straighten any bent coil fins with a fin comb. 4.

  • Page 41: Annual Maintenance

    Maintenance Hot Gas Reheat Additional Oil 2. When recharging the unit after servicing, replace the amount of oil removed, as measured in step 1. Verify oil NOTICE added is the correct type. Compressor Damage! 3. For compressor replacements and/or additional questions, contact Technical Support.

  • Page 42: Troubleshooting

    Troubleshooting • Refer to the Symbio™ 700 Controller with Precedent™ Packaged Rooftop Air-Conditioners Application Guide (ACC-APG002*-EN). PKGP-SVX011B-EN...

  • Page 43: Wiring Diagrams

    Wiring Diagrams Note: Wiring diagrams can be accessed using e-Library by number search field or by contacting technical entering the diagram number in the literature order support. Table 15. Wiring diagrams Drawing Schematic Type Voltage Description Controls Number SCHEMATIC; SHEET 1, POWER, DUAL COMPRESSOR, DUAL Symbio 700 Main Unit 12134334...
  • Page 44 Wiring Diagrams Table 15. Wiring diagrams (continued) Drawing Schematic Type Voltage Description Controls Number Symbio 700 LABEL; FUSE TABLE Main Unit X39004322 Component Location Symbio 700 12134449 DIAGRAM; COMPONENT LOCATION, COOLING/ELECTRIC, B CABINET Component Location Symbio 700 DIAGRAM; COMPONENT LOCATION, GAS, B CABINET 12134450 Component Location Symbio 700...

  • Page 45: Piping Diagrams

    Piping Diagrams OUTDOOR TXV CHECK VALVE INDOOR TXV CHECK VALVE PKGP-SVX011B-EN...
  • Page 46 Piping Diagrams OUTDOOR TXV CHECK VALVE INDOOR TXV CHECK VALVE PKGP-SVX011B-EN...
  • Page 47 Piping Diagrams OUTDOOR TXV CHECK VALVE INDOOR TXV CHECK VALVE PKGP-SVX011B-EN...
  • Page 48 Piping Diagrams OUTDOOR TXV CHECK VALVE INDOOR TXV CHECK VALVE PKGP-SVX011B-EN...
  • Page 49 Piping Diagrams OUTDOOR TXV CHECK VALVE INDOOR TXV CHECK VALVE PKGP-SVX011B-EN...
  • Page 50 Piping Diagrams OUTDOOR TXV CHECK VALVE INDOOR TXV CHECK VALVE PKGP-SVX011B-EN...

  • Page 51: Gas Heat Operation And Maintenance

    Gas Heat Operation and Maintenance Gas Heat Unit General WARNING Information Safety Hazards! Failure to follow instructions below could result in WARNING death or serious injury. Hazard of Explosion or Fire! • Never perform any maintenance procedures until Failure to follow instructions could result in death or the electrical power to the unit is turned off.

  • Page 52: Air Filters

    Gas Heat Operation and Maintenance Notes: Table 16. Recommended standard filters • Single zone VAV is designed to be used with a Filter Size Unit Model Tons zone sensor. If a unit is configured for Single (L x W x D) Number zone VAV operation but is connected to a DHJ150A**(0,A)(L,M,H)

  • Page 53: Heating System Shutdown

    Do not use any phone in your building. or other energy storing components provided by • Open windows and doors. Trane or others, refer to the appropriate • Alert others and evacuate building immediately. manufacturer’s literature for allowable waiting periods for discharge of capacitors.

  • Page 54: Turning Off Gas To Unit

    Hazard of Explosion or Fire! equipment damage. Failure to follow instructions could result in death or Drain and vent coils when not in use. Trane serious injury and equipment or property damage. recommends glycol protection in all possible freezing Do not store or use gasoline or other flammable applications.

  • Page 55: Condensate Overflow Sensor

    Gas Heat Operation and Maintenance Condensate Overflow Sensor (Optional) If installed, the condensate overflow switch will shut down the unit before a drain pan overflow occurs. PKGP-SVX011B-EN...

  • Page 56: Limited Warranty

    WHJ/DHJ Precedent Models MERCHANTABILITY AND FITNESS FOR PARTICULAR USE, AND IN NO EVENT SHALL WARRANTOR BE This warranty is extended by Trane to the original LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL purchaser and to any succeeding owner of the real DAMAGES.
  • Page 57 Notes PKGP-SVX011B-EN...
  • Page 58 Notes PKGP-SVX011B-EN...
  • Page 59 Notes PKGP-SVX011B-EN...
  • Page 60 For more information, please visit trane.com or americanstandardair.com. Trane and American Standard have a policy of continuous product and product data improvement and reserve the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

This manual is also suitable for:

Precedent whj300aPrecedent whj150aPrecedent dhj300a

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