Trane TR-OHS RCU Series Page 30 Installation, Operation And Maintenance Manual Download

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Maintenance

SS-SVX004C-EN

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. Clean unit as necessary

Annual

7. Inspect refrigerant system for leaks and corrosion
8. Conduct a complete check of all services listed above

and clean unit’s interior.

Summary of Contents for TR-OHS RCU Series

Page 1: ...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 adjus...

Page 2: ...quipment that is used in these service procedures In addition some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants Kno...

Page 3: ...ede these policies Non Trane personnel should always follow local regulations Introduction SS SVX004C EN 3 Copyright This document and the information in it are the property of Trane and may not be us...

Page 4: ...Procedures 16 Refrigerant Characteristics 19 Settings and Adjustments 20 High Low Pressure Limit Switches 20 Head Pressure Controls 20 Hot Gas Bypass 20 Commissioning and Decommissioning 21 Operation...

Page 5: ...10 11 Unit RCU Remote Condensing Unit Digit 12 Outdoor Indoor O Outdoor Unit I Indoor Unit About Digits Model numbers are comprised of digits Each digit or set of digits defines the product model Exam...

Page 6: ...electric box on the RCU O is weatherproof There are several cabinet sizes based on the capacity of the unit Refer to the installation drawing supplied with the unit for the layout and dimensions of th...

Page 7: ...r located in the electric box The 012 040 model RCU I use a direct drive blower The 042 120 RCU I units have a belt driven blower with separate drive motor Electric Box RCU electrical components are p...

Page 8: ...provided as standard on RCU O units and as an option on RCU I units A service disconnect switch electrically isolates the unit during routine maintenance The handle of the switch may be locked in the...

Page 9: ...ly lift unit in a LEVEL position could result in unit dropping and possibly crushing operator technician which could result in death or serious injury and equipment or property only damage Test lift u...

Page 10: ...ing for ducted systems Refer to the below figure Notes Do not install the A C system directly above electronic equipment that may hinder serviceability Equipment must be level to operate properly Figu...

Page 11: ...ill be used if the volume of the piping is too large Note The size of the equipment pipe connections does not indicate the size of the refrigerant lines to be used In cases where the pipe size doesn t...

Page 12: ...of 30 equivalent ft for longer rises individual calculations must be made Sizes assume the use of single risers double risers may be necessary Table 2 Recommended liquid line sizes Recommended Liquid...

Page 13: ...se and frequency information specified on the system nameplate The supply voltage measured at the unit must be within 10 of the voltage specified on the nameplate refer to the below figure The namepla...

Page 14: ...the compressor To correct this problem exchange any two of the incoming main power wires at the main power circuit breaker Do not rewire the unit s individual components Electric Box Layout The elect...

Page 15: ...rform a dry nitrogen leak detection test on the system Using dry nitrogen only pressurize the system to 150 psig Ensure all service and solenoid valves are energized open and that no part of the syste...

Page 16: ...Failure to follow instructions below could result in death or serious injury Do not work in confined spaces where refrigerant or other hazardous toxic or flammable gas may be leaking Refrigerant or ot...

Page 17: ...e the cylinder is emptied Initial System Charge Introducing the Refrigerant Charge Follow the steps below to charge systems with R407C refrigerant The initial charge will be performed by introducing l...

Page 18: ...f refrigerant charge This can be done by using the system controller to enable a call for dehumidification lower the humidity setpoint This process may need to be repeated several times After cycling...

Page 19: ...Pressure psig R407C 70 55 85 Switch State Opens Closes Low Pressure Switch psig R407C 10 32 High Pressure Switch psig R407C 410 Manual Reset Saturated Refrigerant Pressure Table The refrigerant vapor...

Page 20: ...liquid flow from the condensing unit to the receiver When using this method of head pressure regulation there must be enough refrigerant in the system to ensure adequate charge at the lowest expected...

Page 21: ...pressure gas 3 The refrigerant then flows to the condensing unit coil The high temperature high pressure gas from the compressor is cooled and condensed by the flow of air through the condensing unit...

Page 22: ...he following recommended guidelines When transferring refrigerant into cylinders ensure that only appropriate refrigerant recovery cylinders are employed Ensure that the correct number of cylinders fo...

Page 23: ...care to avoid accidents and ensure proper operation General Maintenance access to the remote condensing unit is through the removable panel on top of the unit Examine the areas around the air inlet an...

Page 24: ...overload and re set circuit breaker s or motor starter protector s Condensing Unit Head Pressure Too High Non condensable gas or air in system Recover system evacuate per Preparing System for Charging...

Page 25: ...o the unit Check fan motor starter protector contactor fan cycling switch or fan speed controller Suction Pressure too Low Expansion valve not opening fully indicated by abnormally cold suction line O...

Page 26: ...ine whether it is an electrical or a mechanical failure An electrical failure will be indicated by the distinct pungent odor once the system has been opened If a burnout has occurred the oil will be b...

Page 27: ...Cleanup Procedure WARNING Hazardous Voltage Disconnect all electric power including remote disconnects before servicing Follow proper lockout tagout procedures to ensure the power can not be inadverte...

Page 28: ...r opening the sheave one half turn to decrease speed 7 Replace the sheave key and tighten set screw 8 Proper belt tension is achieved when the belt has a deflection of 1 2 inch per foot of span betwee...

Page 29: ...Model Number Sales Order Number Item Number Unit Serial Number Description of Problem Obtaining Warranty Parts A support technician will provide troubleshooting assistance over the telephone If it can...

Page 30: ...gerant 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 Clean unit as nece...

Page 31: ...tolerances Main power wiring connections to the equipment including earth ground have been properly installed Customer supplied main power circuit breaker HACR type or fuses have proper ratings for e...

Page 32: ...are committed to using environmentally conscious print practices Trane by Trane Technologies NYSE TT a global climate innovator creates comfortable energy efficient indoor environments for commercial...

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