Trane Precedent YHJ072A Installation, Operation And Maintenance Manual
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Trane Precedent YHJ072A Installation, Operation And Maintenance Manual

Packaged rooftop air conditioners cooling and gas/electric
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Installation, Operation, and Maintenance
Packaged Rooftop Air
Conditioners
Precedent™ Cooling and Gas/
Electric
High Efficiency
6 to 25 Tons – 60 Hz
Model Numbers: YHJ072A - YHJ300A
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.
December 2022
SAFETY WARNING
RT-SVX075A-EN

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  • Page 1 Installation, Operation, and Maintenance Packaged Rooftop Air Conditioners Precedent™ Cooling and Gas/ Electric High Efficiency 6 to 25 Tons – 60 Hz Model Numbers: YHJ072A - YHJ300A 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 Smoke Detector Sensor (Optional) ..11 Phase Monitor .

  • Page 5: Table Of Contents

    Table of Contents DC Conductors ..... . . 43 Coil Cleaning ......52 Microchannel (MCHE) Coils .
  • Page 6 Model Number Description Digit 1 — Unit Function Digit 18 — Through-the-Base Provisions Digit 12, 13 — Service Sequence Y = DX Cooling, Gas Heat ** = Factory Assigned 0 = No Through-the-Base Provisions A = Through-the-Base Electric B = Through-the-Base Gas Piping Digit 2 —...
  • 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 when the pressure differential across the filters decreases to approximately 0.4 inch w.c. The clogged filter output is The nameplate for the compressors are located on the side energized when the supply fan is operating and the 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 Precautionary Measures WARNING Fiberglass Wool! • Avoid breathing fiberglass dust. Exposure to glass wool fibers without all necessary • Use a NIOSH approved dust/mist respirator. PPE equipment could result in cancer, respiratory, • Avoid contact with the skin or eyes. Wear long-sleeved, skin or eye irritation, which could result in death or loose-fitting clothing, gloves, and eye protection.
  • Page 13 Dimensions and Weights Dimensional Data Figure 2. 6 to 10 tons high efficiency TOP PANEL CONTROL PANEL ACCESS CONDENSER FAN EVAPORATOR SECTION ACCESS PANEL 50-7/8" [1293] ALTERNATE CONDENSATE CONNECTION 3/4 - 14 NPT DIA. HOLE 27-5/8" [700] 47-7/8" [1217] UNIT CONTROL WIRE 88-1/8"...
  • Page 14 Dimensions and Weights Figure 4. 6 to 10 tons high efficiency – horizontal airflow supply/return 3-7/4" [97] 9-3/8" [237] 16-3/4" 32-1/4" [426] [820] 19-1/4" [490] 32-1/4" [820] 27-5/8" [700] 3/4 -14 NPT DIA. HOLE CONDENSATE DRAIN 4-1/4" [109] Figure 5. 6 to 10 tons high efficiency — unit clearance and roof opening CLEARANCE HORIZONTAL FLOW - 18”...
  • Page 15 Dimensions and Weights Figure 6. 6 to 10 tons high efficiency – roof curb 46 3/8” 18 1/4” 1178 MM 1” 470 MM 34 3/8” 25 MM 6 5/8” 873 MM 168 MM 80 1/2” 18 1/2” 14” 2045 MM 470 MM 355 MM 1”...
  • Page 16 Dimensions and Weights Figure 8. 6 to 10 tons high efficiency – swing diameter for hinged door(s) option 17” 432 MM 21 3/8” 543 MM Applicable to Y_C models only 34 5/8” 879 MM Figure 9. 6 to 25 tons high efficiency— gas pipe height Note: Height of gas pipe required from inside unit base to gas shut off assembly (factory provided).
  • Page 17 Dimensions and Weights Figure 10. 12.5 tons high efficiency INDOOR TOP PANEL CONTROL BOX SECTION ACCESS PANEL OUTDOOR TOP PANEL EVAPORATOR SECTION 50-7/8" ACCESS PANEL [1293] ALTERNATE CONDENSATE DRAIN CONNECTION 3/4 - 14 NPT DIA HOLE 27-5/8" CONDENSER COIL [700] 47-7/8"...
  • Page 18 Dimensions and Weights Figure 12. 12.5 tons high efficiency – horizontal airflow, supply and return 3 7/8” 98 MM 9 3/8” 238 MM RETURN 32 1/4” 832 MM 16 3/4” 425 MM SUPPLY 19 1/4” 489 MM 32 1/4” 4 3/4” 832 MM 120 MM 27 5/8”...
  • Page 19 Dimensions and Weights Figure 14. 12.5 tons high efficiency – roof curb 18 1/2” 6 5/8” 470 MM 168 MM 56 3/8” 1” 34 3/8” 1432 MM 25 MM 873 MM 83 7/8” 80 1/2” 18 1/2” 2045 MM 2130 MM 470 MM 1”...
  • Page 20 Dimensions and Weights Figure 16. 6 to 12.5 tons high efficiency – economizer, manual or motorized fresh air damper ECONOMIZER HOOD BAROMETRIC RELIEF HOOD 7-3/4" [198] 7-1/4" 16-3/4" [185] [424] 12" [303] DIMENSIONS EXTENDS TO 21-5/8" (549MM) WHEN POWERED EXHAUST IS COUPLED WITH LOW LEAK ECONOMIZER RT-SVX075A-EN...
  • Page 21 Dimensions and Weights Figure 17. 6 to 12.5 tons high efficiency – power exhaust ECONOMIZER HOOD 5-5/8" [144] 20-1/2" [520] RT-SVX075A-EN...
  • Page 22 Dimensions and Weights Figure 18. 15 to 25 tons high efficiency – power exhaust 22.7 21.4 Figure 19. 15 to 25 tons high efficiency GAS CONNECTION 3/4 NPT (280, 320, 400 MBh) INDOOR TOP PANEL CONTROL BOX SECTION ACCESS PANEL 2"...
  • Page 23 Dimensions and Weights Figure 20. 15 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 24 Dimensions and Weights Figure 22. 15 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” MM (1829 MM) ROOF 76 1/2” OPENING 1943 MM CLEARANCE 48”...
  • Page 25 Dimensions and Weights Figure 24. 15 to 25 ton high efficiency – swing diameter for hinged door(s) option 30" 32" 754MM 809MM 36" 907MM RT-SVX075A-EN...
  • Page 26 Dimensions and Weights Clearances capacity, and peak operating efficiency. Providing less than the recommended clearances may result in condenser coil Figure 25, p. 26 illustrates the minimum operating and starvation, “short-circuiting” of exhaust and economizer service clearances for either a single or multiple unit airflows, or recirculation of hot condenser air.
  • Page 27 Dimensions and Weights Figure 26. Corner weights Center of Gravity Length Center of Gravity Width Center of Gravity Table 2. Factory installed options (FIOPS)/accessory net weights (lb) YHJ072-120 YHJ150 YHJ180-300 Accessory 6, 7.5, 8.5, 10 Tons 15, 17.5, 20, 25 Tons 12.5 Tons Barometric Relief Economizer...
  • Page 28 Dimensions and Weights Lifting and Rigging Figure 28. Rigging and center of gravity — 15 to 25 tons WARNING Heavy Object! Failure to follow instructions below could result in unit dropping which could result in death or serious injury, and equipment or property-only damage. Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted.
  • Page 29 Installation Horizontal Units Figure 30. 12.5 tons high efficiency – horizontal airflow, supply and return If the unit is installed at ground level, elevate it above the snow line. Provide concrete footings at each support 3 7/8” location with a “full perimeter” support structure or a slab 98 MM foundation for support.
  • Page 30 Installation Roof Curb Figure 32. 6 to 10 tons high efficiency – downflow airflow supply/return, through-the-base utilities Downflow 3 5/8” 92 MM 17 1/2” 9 7/8” 17 1/2” 444 MM 251 MM 444 MM The roof curbs for these units consists of a “full perimeter” 4”...
  • Page 31 Installation Figure 35. View for base to roof curb alignment on 1. Confirm unit does not need additional moves by fork lift. C.0 cabinet on a 50" x 84" roof curb 2. Prepare unit for rigging as follows: • 6 to 12.5 ton units: Remove all drill screws fastening wood protection to metal base rail.
  • Page 32 Installation Figure 38. Fork pockets — 12.5 ton high efficiency • Check the unit for shipping damage and material units shortage; file a freight claim and notify appropriate sales representative. • Verify correct model, options and voltage from unit nameplate. •...
  • Page 33 Installation Figure 40. Discard cover plate Figure 42. Vent hood installation Temperature Limit Switch Usage Units are factory shipped in the downflow discharge configuration but can be field converted to a horizontal discharge configuration. Some, but not all units require a different TCO1 limit switch, which is either attached to the combustion blower motor (6 to 12.5 tons) or to the installed TCO1 limit switch (15 to 25 tons) if horizontal discharge...
  • Page 34 Installation Table 3. TC01 tripping values (continued) Figure 44. Return duct cover Unit Model TCO1 Tripping Values - Tons Number Downflow/Horizontal YHJ210A**(0,A)L 140°F-3 inch/150-7 inch YHJ210A**(0,A)M 17.5 150°F-3 inch/195°F-3 inch RTV Sealant YHJ210A**(0,A)H 150°F-3 inch/200°F-3 inch YHJ240A**(0,A)L 140°F-3 inch/150-7 inch YHJ240A**(0,A)M 150°F-3 inch/195°F-3 inch YHJ240A**(0,A)H...
  • Page 35 Installation tons) or to the installed TCO1 limit switch (15 to 25 combustion blower motor (6 to 12.5 tons) or to the tons) installed TCO1 limit switch (15 to 25 tons) for horizontal operation. 3. Replace and discard the existing TCO1 originally installed at the factory for down flow operation with the 4.
  • Page 36 For variable frequency drives from horizontal return duct) or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
  • Page 37 Installation • Connect properly sized and protected power supply 3. Route field piping through this hole to the dimension wiring to a field-supplied/installed disconnect switch shown in Table 4, p. and to the main power terminal block (HTB1) in the unit 4.
  • Page 38 Installation Requirements of Gas Heat Figure 52. Through-the-base gas pipe assemblies for YHJ(072-150)A The unit gas train and optional through-the-base gas shut- off valve are rated at 0.50 PSIG maximum. A pressure reducing regulator is recommended to prevent this maximum from being exceeded. These components must be isolated during field gas piping test that exceed 0.50 PSIG.
  • Page 39 Installation Figure 53. Condensate trap installation pan exits through. 3. Slide the condensate drain pan out of the unit and rotate 180°. 4. Slide the condensate drain pan back into the unit, align the drain with the grommeted opening in the rear support panel and push until the coupling is seated in the grommet.
  • Page 40 Installation Optional TBUE Wiring (Through-the- wiring is properly sized and installed, follow the following guidelines. Base Electrical Option) Verify that the power supply available is compatible with Location of the applicable electrical service is illustrated the unit’s nameplate ratings. The available supply power below.
  • Page 41 Installation Control Power Transformer locations provided on the unit and Table 7, p. 43 for AC conductor sizing guidelines, and; The 24 volt control power transformers are to be used only 1. Use copper conductors unless otherwise specified. with the accessories called out in this manual. Transformers rated greater than 50 VA are equipped with 2.
  • Page 42 Installation Figure 55. Low voltage wiring — C cabinet Figure 56. Low voltage wiring — D cabinet RT-SVX075A-EN...

  • Page 43: Dc Conductors

    Installation Figure 57. Main control panel low voltage wiring Table 7. Recommended wire lengths Notes: – Resistance in excess of 2.5 ohms per Maximum recommended wire conductor can cause deviations in the Wire Size length from unit controller to accuracy of the controls. sensor –...

  • Page 44: Space Temperature Averaging

    Installation Space Temperature Averaging • Example #2 illustrates three sensors squared in a series/parallel circuit. Using BAYSENS077*, two Space temperature averaging is accomplished by wiring a sensors are required to accomplish space temperature number of remote sensors in a series/parallel circuit. averaging.
  • Page 45 Installation Table 9. Temperature vs. resistance Table 10. Sizing natural gas pipe mains and branches Temperature Iron Pipe Size (IPS) Inches Nominal Resistance (kOhms) Degrees °F Degrees °C Length ½" Pipe ¾" Pipe 1" Pipe 1¼" 1½" of Pipe Pipe Pipe -28.9 170.1...

  • Page 46: 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 47: 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 48 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 60.

  • Page 49: Unit Start-Up

    Unit Start-Up Sequence of Operation Table 12. Ignition module diagnostics (continued) See ACC-APG002*-EN, Application Guide, Symbio™ 700 System Lockout: Failed to detect or sustain flame. (failure to ignite, no Controller with Precedent™ Packaged Rooftop Air- 2 Flashes spark, low/no gas pressure, etc.) Conditioners.

  • Page 50: Hot Gas Reheat

    Unit Start-Up and operated for approximately 30 minutes, observe Follow the Test Guide in Figure 60, p. 48 to start the unit in the operating pressures. Compare the operating the heating mode. Momentarily jump across the Test 1 and pressures to the label on the access panel. Test 2 terminals on LTB1 one additional time if continuing from previous component start-up or until the desired start- 3.

  • Page 51: 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 52: Coil Cleaning

    Maintenance Microchannel (MCHE) Coils terminal connections, as well as damaged wire insulation. Make any necessary repairs. NOTICE • Verify that the electric heat system operates properly. Coil Damage! Coil Cleaning Failure to follow instructions below could result in coil damage. Regular coil maintenance, including annual cleaning, DO NOT use any detergents with microchannel enhances the unit’s operating efficiency by minimizing the...

  • Page 53: Annual Maintenance

    Maintenance Final Process 3. For compressor replacements and/or additional questions, contact Technical Support. For future reference, record the unit data below in the blanks provided. Annual Maintenance Clean and repaint any corroded surface. Table 13. Unit data log Complete Unit Model Number Unit Serial Number Wiring Diagram Numbers (from unit control panel)

  • Page 54: Troubleshooting

    Troubleshooting See ACC-APG002*-EN, Application Guide, Symbio™ 700 Controller with Precedent™ Packaged Rooftop Air- Conditioners. RT-SVX075A-EN...

  • Page 55: 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 56 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 57: Piping Diagrams

    Piping Diagrams RT-SVX075A-EN...
  • Page 58 Piping Diagrams RT-SVX075A-EN...
  • Page 59 Piping Diagrams RT-SVX075A-EN...
  • Page 60 Piping Diagrams RT-SVX075A-EN...

  • Page 61: 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 62: Air Filters

    Gas Heat Operation and Maintenance Air Filters Note: Single zone VAV is designed to be used with a zone sensor. If a unit is configured for Single zone VAV Filters are to be used with this unit. Units ship from the operation but is connected to a thermostat, the factory with filters installed.

  • Page 63: Safety Controls

    STOP and proceed with the instructions as or other energy storing components provided by per above Warning. If you do not smell gas, go to the Trane or others, refer to the appropriate next step. manufacturer’s literature for allowable waiting periods 8.

  • Page 64: Heating System Shutdown

    Failure to follow instruction below could result in equipment damage. Drain and vent coils when not in use. Trane Complete the following unit inspections and service recommends glycol protection in all possible freezing routines at the beginning of each heating season.

  • Page 65: 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. RT-SVX075A-EN...

  • Page 66: Limited Warranty

    This warranty is extended by Trane to the original be defective. purchaser and to any succeeding owner of the real...
  • Page 67 Notes RT-SVX075A-EN...
  • Page 68 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.

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Precedent yhj300a

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