Trane CeilAir CW Installation, Operation And Maintenance Manual
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Trane CeilAir CW Installation, Operation And Maintenance Manual

Trane CeilAir CW Installation, Operation And Maintenance Manual

Ceiling mounted precision air conditioners/ air handlers 3.5-35 kw / 60 hz
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Installation, Operation, and Maintenance
CeilAir® CW and DX
Ceiling Mounted Precision Air Conditioners/
Air Handlers
3.5-35 kW / 60 Hz
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 2020
SAFETY WARNING
AH-SVX008C-EN

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  • Page 1 Installation, Operation, and Maintenance CeilAir® CW and DX Ceiling Mounted Precision Air Conditioners/ Air Handlers 3.5-35 kW / 60 Hz 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. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
  • Page 2 (Global Harmonized System of Classification and compounds have the same potential impact to the Labeling of Chemicals) guidelines for information on environment. Trane advocates the responsible handling of allowable personal exposure levels, proper all refrigerants-including industry replacements for CFCs respiratory protection and handling instructions.
  • Page 3 Copyright This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.

  • Page 4: Table Of Contents

    Table of Contents Model Number Descriptions A-Tech 1.2 Programmable Thermostat . .22 ....6 Air-Cooled Split Systems ... . .22 Overview .
  • Page 5 Table of Contents spection ......46 Technical Support ....46 Obtaining Warranty Parts .

  • Page 6: Model Number Descriptions

    Model Number Descriptions CeilAir® Overhead System About Digits Digit 1, 2, 3, 4, 5 — System Model numbers are comprised of TR-OHS = CeilAir® Overhead System digits. Each digit, or set of digits,  defines the product model. Digit 6, 7, 8 — Capacity MBH Example using model ...

  • Page 7: Overview

    Overview General Figure 1. A-Tech digital thermostats Trane CeilAir overhead air conditioning systems (TR-OHS) are constructed using the finest available materials/ components, state-of-the-art technology and quality craftsmanship. The unit will provide years of trouble free service if installed and maintained in accordance with this manual.

  • Page 8: Coil(S)

    Overview Figure 3. All CeilAir TR-OHS-032-AR (access panels removed) Coil(s) Optional Equipment The cooling and optional hot water reheating coils are Humidistat/Dehumidistat aluminum finned/copper tube construction. The coils are leak tested and cleaned before installation at the factory. As an option for systems employing an A-Tech 1.1 or A- Tech 1.2 thermostat, a room mounted humidistat and/ or Blower dehumidistat can be shipped loose for field installation.

  • Page 9: Humidifier

    Electric resistance heating elements are factory installed in the supply airstream to As an option, Trane offers spot type or strip/cable type heat the supply air. The heating elements are protected water detectors. In units equipped with a microprocessor...

  • Page 10: Aws Operation

    Overview Figure 4. Free cooling The compressor activates, if the DX cooling stage enable- separate DX refrigeration circuit can be utilized to assist. temperature setpoint has been reached or if the control Similar to FC operation (see “Free-cooling Operation,” valve position reaches 100% open for 240 seconds (default 9), when return air temperature rises to the AWS cut-in compressor-on time delay).
  • Page 11 Overview Figure 5. Alternate water source If the return air temperature rises to the compressor cut-in setpoint or if the AWS control valve reaches 100% open for 240 seconds (default compressor-on time delay), the compressor turns on and operates in parallel with AWS cooling.

  • Page 12: Installation

    Trane ships all equipment Factory FOB. Trane can assist in conditioned space. The vapor barrier in the ceiling and the claim filing process with the freight carrier. Should any walls can be polyethylene film.

  • Page 13: Mounting

    Installation Mounting suspended ceiling for ducted systems. See the below figure. CeilAir TR-OHS systems are designed for ceiling mounting in a suspended ceiling grid (spot cooler) or above the Figure 6. Typical installation 2X4 CAB = TYPICAL for 2X4 H CAB or LARGE MODELS (BY OTHERS) Notes: Do not install the A/C system directly above recommended that the remote condenser/condensing...
  • Page 14 Installation Figure 7. A-Tech controller installation NOTICE Sensor Damage! Do not touch the temperature sensor on the bottom left corner of the thermostat. The sensor can be damaged if handled improperly. 3. If using the supplied anchors, drill two 3/16 in. holes and tap in the wall anchors.

  • Page 15: Optional Equipment

    As an option, (T/H) sensor must be located so that it will properly sense a 30 ft, 75 ft or 150 ft long cable may be provided by Trane. the temperature and/or humidity conditions to be con- trolled.
  • Page 16 Installation Remote Temperature/Humidity Sensor (E²) Controls may be installed either on a flush switch box or on a surface switch box. Follow the steps below for mounting. Instructions for wiring the unit are provided in Section Figure 11. Temperature/humidity sensor for E² controller “Humidistat/Dehumidistat,”...

  • Page 17: Piping Connections

    Installation Cable Type Water Detector Piping Connections Important: Do not allow the cable water detector to Refrigerant contact metal (frame or condensate pan). It must be mounted on the plastic stand-offs Self-Contained Systems provided with the water detector. No refrigeration connections are required for self- Figure 13.
  • Page 18 Installation Table 2. Pipe equivalent lengths Equivalent Length (ft) of Straight Pipe O.D. (in.) Line Globe Angle Size Valve Valve 90º Elbow 45º Elbow Tee Line Tee Branch 12.0 15.0 1 1/8 22.0 12.0 1 3/8 28.0 15.0 Oil traps must be included every 20 ft in the vertical risers Table 4.

  • Page 19: Condensate Drain Line

    Installation Table 5. Recommended suction line sizes for R407C Note: Do not exceed 15 ft of vertical distance when refrigerant (continued) installing the condensing unit below the evaporator. Line O.D. (in.) All suction lines must be insulated to prevent Model No./ or less or less 50 ft...

  • Page 20: Condensate Pump

    Installation drain line must be located so it will not be exposed to freezing temperatures. The drain line should be the full NOTICE size of the connection. See the installation drawing Humidifier Damage provided with your unit for the size and location of the Do not use demineralized water in the humidifier.
  • Page 21 Installation the equipment; verify all wiring terminations are Figure 15. Sample nameplate secure. A manual fused disconnect switch must be provided per the National Electrical Code and local codes for servicing the equipment. Do not mount a shipped-loose, non-fused service switch or customer supplied disconnect switch to the surface of the unit.

  • Page 22: Controls

    Installation Controls Figure 16. A-Tech 1.1 (top) and 1.2 (bottom) controller wiring contacts If the unit is equipped with an A-Tech controller, see the Robertshaw 9701i/9725i2 User's Manual shipped with the A-Tech 1.1 Single-Stage Controller unit for programming instructions. Wiring contacts on the single and dual-stage versions of the A-Tech controller are TERMINAL DESIGNATORS shown in...
  • Page 23 Installation Figure 17. A-Tech 1.1 control wiring Figure 18. A-Tech 1.2 control wiring AH-SVX008C-EN...
  • Page 24 Installation Figure 19. Interconnection field wiring remote condenser CONTROL CONFIGURATION (OPTIONAL) E² 6 CNDCT. PHONE TYPE 3 CONDUCTOR NON-SHIELDED CABLE SHIELDED CABLE SEE NOTE 3 REMOTE TEMPERATURE/ E² CONTROLLER DISPLAY HUMIDITY SENSOR E² DISPLAY PLUGS DIRECTLY INTO THE (OPTIONAL) CONTROLLER INSIDE THE ELECTRIC BOX CONTROL THERMOSTAT CONFIGURATION (OPTIONAL)
  • Page 25 Installation Figure 21. Interconnection field wiring remote condensing unit with dual compressors E² CONTROL CONFIGURATION (OPTIONAL) 6 CNDCT. PHONE TYPE 3 CONDUCTOR NON-SHIELDED CABLE SHIELDED CABLE SEE NOTE 3 REMOTE TEMPERATURE/ E² CONTROLLER DISPLAY HUMIDITY SENSOR E² DISPLAY PLUGS DIRECTLY INTO THE (OPTIONAL) CONTROLLER INSIDE THE ELECTRIC BOX THERMOSTAT...

  • Page 26: Optional Equipment

    Installation Remote Shut Down NOTICE The unit provides an interface that allows for remote shut Transformer Damage! down. A normally-closed switch rated at 5 amperes at 24VAC is required for this purpose. Two conductors from Connecting additional load to a factory supplied control the normally closed switch must be connected to the transformer may result in overloading the transformer.

  • Page 27: System Charging Procedures

    Installation electric box. Refer to the electrical drawing supplied with your unit for proper wire terminations. NOTICE Important: Do not allow the cable water detector to Pump Damage! contact metal (frame or condensate pan). It Do not run the pump when dry. must be mounted on the plastic stand-offs provided with the water detector.
  • Page 28 Installation R407C Refrigerant Table 6. Weight (lb) of refrigerant per 100 of type L tubing (continued) CeilAir TR-OHS systems use either R407C refrigerant. Line Size Refrigerant charging pressures vary depending on the (in.) Liquid Line Discharge Line type of refrigerant used in the unit. Before charging, check the unit nameplate to confirm the type of refrigerant to O.D.
  • Page 29 Installation Evacuate the System nitrogen molecules to disperse in the system absorbing moisture. 6. After two hours, release the pressure. Then turn on the NOTICE vacuum pump and evacuate the system a second time Compressor Damage! down to 150 microns or less. Close the vacuum pump isolation valve and pressurize the system again with A proper vacuum must be drawn on the refrigerant dry nitrogen and allow the system to stand for two...

  • Page 30: Refrigerant Characteristics

    Installation Fine Tuning The System Charge enable a call for dehumidification (lower the humidity setpoint). This process may need to be repeated Once the initial charge is completed, additional refrigerant several times. After cycling the system through the hot will need to be added with the unit running. gas reheat cycle, recheck the system charge with the Important: An adequate heat load must be supplied to...

  • Page 31: Saturated Refrigerant Pressure Tables

    Installation Saturated Refrigerant Pressure Tables Table 8. Refrigerant pressure/temperature settings The following table shows the refrigerant pressures are Refrigerant Pressure/Temperature Settings provided for reference for R407C refrigerant. Normal Min. Max. Table 9. Refrigerant vapor tables Sub-cooling°F R407C Refrigerant Superheat°F Temp. Pressure Design Condensing Temp.

  • Page 32: System Settings And Adjustments

    Installation System Settings and The fan speed controller will automatically control the head pressure at a level to maintain design refrigerant Adjustments discharge pressures. On systems with more than one fan on the condenser, the remaining motors cycle on and off Low/High Pressure Limit Switch based on pressure.

  • Page 33: Blower Adjustment

    Installation Note: Systems utilizing air cooled condensers must not potentiometer may need to be field adjusted if the have a refrigerant line pressure drop greater than humidifier does not supply enough capacity for the current 14 psig across the condenser and the room conditions.
  • Page 34 (to tighten) or lowering (to Hot Gas Bypass (Optional) loosen) the nuts on the adjustment rods of the motor base. The two most common systems provided by Trane for hot gas bypass are snap acting and full floating, described below. NOTICE...
  • Page 35 Installation remove the adjustment cap from end of the valve. Using a 5/16 in. Allen wrench, turn clockwise to increase pressure or counterclockwise to lower the pressure. NOTICE Compressor Failure! Do not exceed 20°F superheat. Exceeding this temperature may cause failure of the compressor. The normal control setting for the quench valve is 20°F superheat (when there is no call for cooling).

  • Page 36: Commissioning, Operation And Decommissioning

    It should be requirements. An Operation and Maintenance manual completed during start-up and sent to Trane. This for the humidifier is provided with your unit under checklist should be used as a guideline for items separate cover.

  • Page 37: Programming The Thermostat

    Commissioning, Operation and Decommissioning Programming the Thermostat 5. If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system. A-Tech Controller 6. Place the cylinder receiving the refrigerant on the scale The A-Tech controller is a programmable thermostat that before starting recovery.

  • Page 38: Labeling Decommissioned Equipment

    Commissioning, Operation and Decommissioning • If compressors or compressor oils are to be removed, ensure they have been evacuated to an acceptable level to make certain flammable refrigerant does not remain within the lubricant. The evacuation process must be carried out prior to returning the compressor to the suppliers.

  • Page 39: Maintenance

    Inspection Checklist" in Appendix A to record periodic Verify the following: general maintenance inspections. For assistance, contact • Controller operation Trane Product Support. Follow all safety instructions while performing any type of maintenance. • Customer setpoints Trane recommends a general schedule of quarterly •...
  • Page 40 Maintenance Air Filters repeatedly flashes four times to indicate the cylinder should be replaced. Air filters are usually the most neglected item in an air Note: The yellow LED may illuminate during initial start- conditioning system. To maintain efficient operation, the up but it doesn't necessarily mean the cylinder filters may require inspection monthly.

  • Page 41: Troubleshooting

    Maintenance Troubleshooting specifically requires the system to operate. Keep hands, clothing and tools clear of the electrical terminals and rotating components. Equipment located in the ceiling can Troubleshooting steps are listed in the following table. pose unusual difficulties. Ensure that your footing is stable Turn off all power to the unit before conducting any at all times.
  • Page 42 Maintenance Table 10. Troubleshooting methods (continued) Symptom Probable Cause Recommendation a. Expansion valve stuck in open position Ensure feeder bulb is tight on suction line.Check (abnormally cold suction line). operation and superheat. b. Worn or scarred compressor bearings. Replace compressor. Noisy Compressor c.
  • Page 43 Maintenance Table 10. Troubleshooting methods (continued) Symptom Probable Cause Recommendation a. Water supply has been turned off or not Connect and/or turn on water supply. connected. b. Humidifier switch is in “Off” position. Turn switch to “Auto/On” position. c. Electrical connections are loose. Tighten electrical connections.

  • Page 44: Field Service

    Maintenance Field Service dirt and oily film. Use a wire brush, sand cloth or sandpaper and wipe the area with clean, dry cloths. Protect nearby parts from heat damage by wrapping with water- Note: Do not attempt to make repairs without the proper soaked cloths.
  • Page 45 Maintenance warranty. Always consult the factory prior Note: Cleaning operations must be performed by a to replacing the compressor. journeyman refrigeration mechanic or air conditioning technician. Standard Cleanout Procedure 1. These systems should be cleaned using the suction line filter-drier method. WARNING 2.

  • Page 46: Product Support

    Maintenance Product Support replacement cylinder must be installed. The cylinder is disposable and cylinder life is dependent on water supply conditions and humidifier usage. Refer to the humidifier Product Support provides aftermarket technical and field operator's manual supplied under separate cover for support, warranty authorization and part sales to detailed instructions on changing the cylinder.

  • Page 47: Obtaining Spare/Replacement Parts

    Maintenance • Date of Order • Stated Part Price • Customer Billing Address • Shipping Address • Customer’s Telephone and Fax Numbers • Contact Name • Unit Model No., Serial No. and Item No. The customer is responsible for the shipping cost incurred for returning the defective part(s).

  • Page 48: Appendix A Tr-Ohs Preventive Maintenance Inspection Checklist

    Appendix A TR-OHS Preventive Maintenance Inspection Checklist Complete a copy of this document for each TR-OHS unit. Site Name Site Contact Site Address Site Phone City, State Service Date Technical Name Unit Model Unit Serial Table 11. Current room conditions Room Temperature: Room Humidity: Table 12.
  • Page 49 Appendix A TR-OHS Preventive Maintenance Inspection Checklist Table 17. Record fan motor amp draw (Fan 1)L1: (Fan 2)L1: (Fan 3)L1: Table 18. Check compressor operation   No  N/A Check electrical connections:   No  N/A Visual inspect for oil leaks: ...
  • Page 50 Appendix A TR-OHS Preventive Maintenance Inspection Checklist Table 23. Check heater operation   No  N/A Check electrical connections:   No  N/A Check heater elements for any damage:   No  N/A Inspect heater overloads for damage: Table 24.
  • Page 52 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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