Trane Precedent YZJ150A Installation, Operation And Maintenance Manual
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Trane Precedent YZJ150A Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance
Packaged Rooftop Air Conditioners
Precedent™ Cooling and Gas/
Electric
Ultra High Efficiency
12.5 to 25 Tons – 60 Hz
Model Numbers: YZJ150A - YZJ300A
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
RT-SVX077A-EN

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  • Page 1 Installation, Operation, and Maintenance Packaged Rooftop Air Conditioners Precedent™ Cooling and Gas/ Electric Ultra High Efficiency 12.5 to 25 Tons – 60 Hz Model Numbers: YZJ150A - YZJ300A 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 High Temperature Sensor (FIAHTST001*) ..... . . 11 General Information .

  • Page 5: Table Of Contents

    Table of Contents Drain Pan Removal (Units with Condensate Monthly Maintenance ..... 40 Overflow Switch Option) ....29 Filters .
  • Page 6 Model Number Description Digit 1 — Unit Function Digit 12, 13 — Service Sequence Digit 18 — Through-the-Base Provisions 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 4 = Clogged Filter Switch and Condensate Overflow Switch Digit 26— Not Used Digit 27— Unit Hardware Enhancements 0 = No Enhancements 1 = Stainless Steel Drain Pan Digit 28—...
  • 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 Clogged Filter Switch (Optional) The unit mounted clogged filter switch monitors the The nameplate for the compressors are located on the side pressure differential across the return air filters. It is of the compressor. mounted in the filter section and is connected to the Fresh Air Options Module.
  • Page 10 This sensor features remote zone sensing and timed When the LPC is opened for 1 continuous second, the override with override cancellation. It is used with a Trane compressor for that circuit is turned off immediately. The Integrated Comfort™ building management system.
  • Page 11 General Information Smoke Detector Sensor High Temperature Sensor (FIAHTST001*) (Optional) This sensor connects to the Symbio™ 700 Emergency Stop Input and provides high limit “shutdown” of the unit. This sensor provides high limit “shutdown” of the unit and The sensor is used to detect high temperatures due to a requires a manual reset.
  • Page 12 General Information – The line to line voltage is not between 180 volts and 633 volts. RT-SVX077A-EN...
  • Page 13 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 14 Dimensions and Weights Dimensional Data Figure 2. 12.5 to 25 tons ultra high efficiency INDOOR TOP PANEL CONTROL BOX SECTION ACCESS PANEL OUTDOOR TOP PANEL COMPRESSOR SECTION ACCESS PANEL EVAPORATOR SECTION ACCESS PANEL 3/4" NPT GAS CONNECTION 2" ELECTRICAL CONNECTION 66'' HORIZONTAL ACCESS [1676]...
  • Page 15 Dimensions and Weights Figure 4. 12.5 to 25 tons ultra 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 YZJ (150 – 300)A 1 3/6 Figure 5.
  • Page 16 Dimensions and Weights Figure 6. 12.5 to 25 tons ultra high efficiency – power exhaust 22.7 21.4 Figure 7. 12.5 to 25 tons ultra high efficiency – unit clearance and roof opening CLEARANCE 36” 914 MM UNIT OUTLINE CLEARANCE 68” 1727 MM CLEARANCE FORM TOP OF UNIT 72”...
  • Page 17 Dimensions and Weights Figure 8. 12.5 to 25 tons ultra 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”...
  • Page 18 Dimensions and Weights Clearances capacity, and peak operating efficiency. Providing less than the recommended clearances may result in condenser coil Figure 10, p. 18 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 19 Dimensions and Weights Figure 11. Corner weights Center of Gravity Length Center of Gravity Width Center of Gravity Table 2. Factory installed options (FIOPS)/accessory net weights (lb) YZJ150-300 Accessory 12.5, 15, 17.5, 20, 25 Tons Barometric Relief Economizer Low Leak Economizer - Downflow Low Leak Economizer - Horizontal Oversized Motor Powered Convenience Outlet...
  • Page 20 Dimensions and Weights Lifting and Rigging Figure 12. Rigging and center of gravity — 12.5 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 21 Installation Horizontal Units Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence and to reduce static If the unit is installed at ground level, elevate it above the pressure. snow line. Provide concrete footings at each support When attaching the ductwork to the unit, provide a water location with a “full perimeter”...
  • Page 22 Installation Verify that appropriate materials were used in the Note: For unit protection, the top crate should remain in construction of roof and ductwork. Combustible materials place during lifting. If it must be removed prior to should not be used in the construction of ductwork or roof lifting, protect unit from damage.
  • Page 23 Installation • Check the unit for shipping damage and material Figure 16. Discard cover plate shortage; file a freight claim and notify appropriate sales representative. • Verify correct model, options and voltage from unit nameplate. • Verify that the installation location of the unit will provide the required clearance for proper operation.
  • Page 24 Installation Figure 18. Vent hood installation Table 3. TCO1 tripping values (continued) TCO1 Tripping Values Unit Model Tons (3" Switch) Number Downflow/Horizontal YZJ210A**(0,A)L 140°F/150°F YZJ210A**(0,A)M 17.5 130°F/160°F YZJ210A**(0,A)H 120°F/155°F YZJ240A**(0,A)L 140°F/150°F YZJ240A**(0,A)M 125°F/160°F YZJ240A**(0,A)H 115°F/155°F YZJ300A**(0,A)L 140°F/150°F YZJ300A**(0,A)M 125°F/160°F YZJ300A**(0,A)H 115°F/155°F TCO1 Instructions Temperature Limit Switch Usage for Gas...
  • Page 25 Installation Figure 19. TCO1 instructions Additional TCO1 limit switch to be used for horizontal discharge field conversion Location of TCO1 limit to be installed YZJ(150-300)A (12.5 to 25 Ton Units) Note: The TCO1 switch is attached by two screws in the Figure 20.
  • Page 26 Installation Air-Fi® Wireless Communication Note: Refer to horizontal views below of the 12.5 to 25 ton units. Interface Figure 21. 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 27 Trane or others, refer to the appropriate 2. The gas piping assembly ships inside this section and manufacturer’s literature for allowable waiting periods includes the shut-off valve, a pressure tap for testing, for discharge of capacitors.
  • Page 28 Installation Figure 26. Through-the-base gas pipe assembly for YZJ(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 29: Drain Pan Removal (Units With Condensate Overflow Switch Option)

    Installation Figure 27. Condensate trap installation Figure 28. Location of outdoor motor controllers Controller 1 linked to Motor 1 Controller 2 linked to Motor 2 (front motor closest to control panel) (rear motor) 38.1 Field Installed Power Wiring Note: Minimum if unit static is higher trap must be taller to drain appropriately.

  • Page 30: Main Unit Power

    Installation Main Unit Power Notes: • Black gasket is shipped from the factory and is WARNING located in the literature Ship With bag in the Proper Field Wiring and Grounding control box. Apply black gasket around conduit Required! plate on all four sides after installation to prevent air leakage from the building entering Failure to follow code could result in death or serious the electrical enclosures.

  • Page 31: Controls Using 24 Vac

    Installation WARNING 1. Use copper conductors unless otherwise specified. 2. Ensure that the AC control wiring between the controls Hazardous Voltage! and the unit’s termination point does not exceed 2.5 Failure to disconnect power before servicing could ohms/conductor for the length of the run result in death or serious injury.

  • Page 32: Controls Using Dc Analog Input/Outputs (Standard Low Voltage Multi Conductor Wire)

    Installation Figure 30. Main control panel low voltage wiring Table 6. 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 33: 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 34 Installation Table 8. Temperature vs. resistance Table 9. 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 35: 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 36: 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 37 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 38: Unit Start-Up

    Unit Start-Up Sequence of Operation Table 11. Ignition module diagnostics (continued) See ACC-APG002*-EN, Application Guide, Symbio™ 700 System Lockout: Failed to detect or Controller with Precedent™ Packaged Rooftop Air- sustain flame. (failure to ignite, no 2 Flashes spark, low/no gas pressure, etc.) Conditioners.

  • Page 39: Hot Gas Reheat

    Unit Start-Up and operated for approximately 30 minutes, observe Follow the Test Guide in Figure 33, p. 37 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 40: 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 41: 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 42: 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 12. Unit data log Complete Unit Model Number Unit Serial Number Wiring Diagram Numbers (from unit control panel)

  • Page 43: Troubleshooting

    Troubleshooting • Refer to the Symbio™ 700 Controller with Precedent™ • Refer to the Packaged Rooftop Air Conditioners Packaged Rooftop Air-Conditioners Application Guide Precedent™ eFlex™ Variable Speed Compressor (ACC-APG002*-EN). Inverter Troubleshooting Guide (RT-SVD008*-EN). RT-SVX077A-EN...

  • Page 44: 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 14. Wiring diagrams Schematic Type Voltage Drawing Number Description Controls SCHEMATIC; SHEET 1, POWER, DUAL COMPRESSOR, SINGLE Symbio 700 Main Unit 12134333...
  • Page 45 Wiring Diagrams Table 14. Wiring diagrams (continued) Schematic Type Voltage Drawing Number Description Controls Symbio 700 Main Unit 12134447 SCHEMATIC; SHEET 8, CONTROLS,STEPPER MOTOR CONTROLLER Symbio 700 SCHEMATIC; SHEET 9, CONTROLS, XM30/XM32 EXPANSION MODULES Main Unit 12134448 Symbio 700 LABEL; FUSE TABLE Main Unit X39004322 Main Unit...
  • Page 46 Wiring Diagrams Table 14. Wiring diagrams (continued) Schematic Type Voltage Drawing Number Description Controls Component Location Symbio 700 12134450 DIAGRAM; COMPONENT LOCATION, GAS, B CABINET Component Location Symbio 700 DIAGRAM; COMPONENT LOCATION, COOLING/ELECTRIC, C CABINET 12134451 Component Location Symbio 700 DIAGRAM;...

  • Page 47: Piping Diagrams

    Piping Diagrams Figure 34. Piping diagram – 12.5 to 15 tons ultra high efficiency (YZJ150–180) RT-SVX077A-EN...
  • Page 48 Piping Diagrams Figure 35. Piping diagram – 12.5 to 15 tons ultra high efficiency - hot gas reheat (YZJ150–180) RT-SVX077A-EN...
  • Page 49 Piping Diagrams Figure 36. Piping diagram – 17.5 to 25 tons ultra high efficiency (YZJ210–300) RT-SVX077A-EN...
  • Page 50 Piping Diagrams Figure 37. Piping diagram – 17.5 to 25 tons ultra high efficiency - hot gas reheat (YZJ210–300) RT-SVX077A-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 15. Recommended standard filters • Single zone VAV is designed to be used with a Filter Size Tons Unit Model Number zone sensor. If a unit is configured for Single (L x W x D) zone VAV operation but is connected to a 20 x 24 x 2 thermostat, the control will revert to multi-speed...

  • Page 53: Heating System Start-Up

    For variable frequency drives your gas supplier, call the fire department. or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods 7. Wait (five) minutes to clear out any gas. If you then 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. RT-SVX077A-EN...

  • Page 56: Limited Warranty

    This warranty is extended by Trane to the original be defective. purchaser and to any succeeding owner of the real...
  • Page 57 Notes RT-SVX077A-EN...
  • Page 58 Notes RT-SVX077A-EN...
  • Page 59 Notes RT-SVX077A-EN...
  • Page 60 For more information, please visit trane. com or tranetechnologies.com. Trane has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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