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Installation, Operation, and Maintenance
Remote Condensing Units
Air-Cooled Indoor and Outdoor Remote
Condensing Units
3-35 kW DX Air-Cooled
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
SS-SVX004C-EN
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Table of Contents
Related Manuals for Trane TR-OHS RCU Series
Summary of Contents for Trane TR-OHS RCU Series
- Page 1 Installation, Operation, and Maintenance Remote Condensing Units Air-Cooled Indoor and Outdoor Remote Condensing Units 3-35 kW DX Air-Cooled 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 PRIOR to Practices servicing the unit. NEVER PERFORM ANY Trane believes that responsible refrigerant practices are SWITCHING, DISCONNECTING, OR VOLTAGE TESTING WITHOUT PROPER ELECTRICAL PPE AND important to the environment, our customers, and the air conditioning industry.
- 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.
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Page 4: Table Of Contents
Table of Contents Model Number Descriptions Compressor ......23 ....5 Troubleshooting Introduction . -
Page 5: Model Number Descriptions
Model Number Descriptions Digit 1, 2, 3, 4, 5 — System About Digits TR-OHS = Overhead System Model numbers are comprised of Digit 6, 7, 8 — Capacity (MBH) digits. Each digit, or set of digits, defines the product model. Example using model ... -
Page 6: Introduction
RCU systems are designed to reject heat from refrigerant based cooling equipment. Any use beyond this is deemed RCU systems are designed for operation within the to be not intended. Trane is not liable for any damage following ranges: resulting from improper use. The RCU-O system is... -
Page 7: General Design
Introduction General Design Fan Assembly The RCU-O uses a propeller type aluminum, multi-blade Figure 1 depicts a typical layout of the RCU-I and RCU-O fan with a direct drive motor. The motor is equipped with and identifies their major components. internal overload protection and is protected from over Compressor current by a motor starter protector located in the electric... -
Page 8: Safety Features
Introduction Circuit Breakers/Motor Starter Protectors Individual overload protection is provided by circuit breaker(s), and motor starter protectors. These switches open to de-energize a failed component if an electrical overload condition is encountered. They must be manually reset once the overload condition is cleared. Receiver An optional receiver is provided for storage of excess refrigerant in the refrigeration cycle. -
Page 9: Installation
Trane ships all equipment FOB factory the unit. Lifting cables (chains or slings) may not be of and is not liable for any equipment damage while in the same length. -
Page 10: Mounting/Placing The Rcu-I
Installation Condensing units must not be located in the vicinity of Mounting/Placing the RCU-I steam, hot air or fume exhausts. The clearance around the unit should be at least 1 times (1×) the unit’s width to ensure adequate airflow to the coil. Space multiple units WARNING so that hot condensing exhaust air is not directed toward Proper Structural Support Required! -
Page 11: Refrigerant Pipe Sizing
Installation grade refrigerant copper piping. Dry nitrogen should be Note: The size of the equipment pipe connections does flowing through the tubing while soldering at a rate of not not indicate the size of the refrigerant lines to be less than 1-2 CFM. Be careful not to allow solder/piping used. - Page 12 Installation Suction piping is typically sized for a total friction pressure (a) Equivalent ft accounts for the linear pipe length as well as equivalent drop equivalent to 2°F evaporator temperature. length of Valves, Elbows & Tee’s as shown in the previous chart. If the RCU is installed below the evaporator, the suction line should include an inverted trap the height of the Recommended suction line sizes...
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Page 13: Utility Connections
Installation Utility Connections will draw under full design load, the minimum circuit ampacity (MCA) for wire sizing, and the maximum fuse or HACR (Heating, Air Conditioning, Refrigeration) breaker size (MAX FUSE/CKT BKR) for circuit protection. The unit's WARNING nameplate is located inside the cabinet within the Proper Field Wiring and Grounding electrical box. -
Page 14: Electric Box Layout
Installation Figure 6. Sample nameplate WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury. Note: All wiring must conform to local and national electrical code requirements. -
Page 15: System Charging
Installation System Charging Preparing System for Charging Note: Refrigerant charging must be performed by a DX Charging Requirements journeyman, refrigerant mechanic or an air conditioning technician. When performing the specific DX charging procedures in this section, follow these best practices: 1. -
Page 16: Refrigerant Charging Procedures
Warranty Registration and Start-up Checklist and the system, this time with a goal of achieving a 500 ensure it is filed with Trane for the warranty protection. micron vacuum or less. Close the vacuum pump Estimating Refrigerant Charge isolation valve. - Page 17 Installation When charging a system using a blended refrigerant, Table 5. Weight of refrigerant (lb/100 ft, Type L) maintaining the composition of the refrigerant is essential. To ensure correct composition, introduce the refrigerant Liquid Line 105°F Suction Line 40°F Line Size O.D. (R407C) into the system in liquid rather than vapor form.
- Page 18 Installation superheat and sub-cooling temperatures with the Important: An adequate heat load must be supplied to system only in the cooling mode. ensure a proper charge. 3. Disconnect the refrigerant cylinder from the discharge Important: Remove the blockage to the air intake of the side of the compressor and connect it to the suction condenser.
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Page 19: Refrigerant Characteristics
Installation Refrigerant Characteristics Table 8. Refrigerant vapor tables Pressure/Temperature Settings R407C Refrigerant Tables below are provided to assist with the normal Temp. (°F) Pressure (psig) settings of the system for R407C refrigerant. Where Saturated Evaporating Temperature applicable, minimum and maximum settings are given 37.9 along with normal operating pressures. -
Page 20: Settings And Adjustments
Installation A receiver is used to store the refrigerant during the time Settings and Adjustments the condensing unit is not using the extra refrigerant charge. The head pressure control valve does not begin to High/Low Pressure Limit Switches allow refrigerant to pass to the receiver until the discharge RCU units are equipped with hermetically sealed high pressure is at least 225 psig for R407C. -
Page 21: Commissioning And Decommissioning
Note: A Warranty Registration and Start-Up Checklist is not in circulation. provided with the unit data package. It should be completed during start-up and sent to Trane. This 5. The liquid refrigerant flows through a sight glass. This checklist should be used as a guideline for items device indicates the presence of air and moisture and that need to be confirmed during start-up. -
Page 22: Recovering Refrigerant
Commissioning and Decommissioning Personnel performing the decommissioning must be Recovering Refrigerant completely familiar with the unit before starting. Best When removing refrigerant from a system, either for practice requires all refrigerants be recovered safely; refer servicing or decommissioning, best practice is to remove “Recovering Refrigerant,”... -
Page 23: Maintenance
Maintenance necessary. On outdoor units do not permit snow to Periodic General Maintenance accumulate on or around the RCU in the winter. Check all refrigerant lines and capillaries for vibration isolation and support as necessary. Check all refrigerant and lines for WARNING signs of leaks. -
Page 24: Troubleshooting
Maintenance Troubleshooting WARNING Hazardous Service Procedures! Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless specified otherwise, disconnect all electrical power including remote... - Page 25 Maintenance Symptom Probable Cause Recommendation Expansion valve stuck in open position Check operation of the expansion valve and Noisy Compressor (abnormally cold suction line). superheat. Worn or scarred compressor bearings. Replace compressor. Broken compressor valve (compressor knocking, suction pressure rises faster than 2 lb/ Replace compressor.
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Page 26: Field Service
Maintenance Symptom Probable Cause Recommendation Low line voltage causing compressor to Check power source for cause of low line Compressor Short Cycles overheat. voltage. Dirty or iced over evaporator coil. Defrost and clean evaporator/heat exchanger. Reduced airflow (when applicable). Check filter and belt tension. Lack of refrigerant. - Page 27 Maintenance Important: Damage to a replacement compressor Burn-Out/Acidic Cleanup Procedure caused by improper system cleaning constitutes abuse under the terms of the WARNING warranty. This will void the compressor warranty. Always consult the factory prior Hazardous Voltage! to replacing the compressor. Disconnect all electric power, including remote If there is no acid in the oil, there has been a mechanical disconnects before servicing.
- Page 28 Maintenance Blower Belt Tensioning and Speed Adjustment NOTICE Belt Tension! WARNING Do not over-tension belts as it could reduce fan and Hazardous Voltage! motor bearing life, accelerate belt wear and possibly Disconnect all electric power, including remote cause shaft failure. disconnects before servicing.
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Page 29: Product Support
Maintenance Product Support Obtaining Warranty Parts A support technician will provide troubleshooting Product Support provides aftermarket technical and field assistance over the telephone. support, warranty authorization and part sales to If it can be determined that a part may be defective, a contractors and end users. -
Page 30: Recommended Maintenance
Maintenance Recommended Maintenance Monthly Check Remote condensing unit clean and clear of obstructions. Semi-Annual 1. Check refrigerant charge (bubbles in sight-glass) 2. Check suction and discharge pressure 3. Ensure refrigerant lines are secured 4. Tighten electrical connections 5. Ensure motor mount is secured 6. - Page 31 Appendix A Forms Checklist for Completed Installation Proper clearances for service access have been maintained around equipment. Equipment is level and mounting fasteners are tight. Piping completed to refrigeration equipment. All field installed piping leak tested. ...
- Page 32 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.