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Trane RTAA-170 User Manual

Trane RTAA-170
140 pages
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Library Service Literature
Product Section Refrigeration
Product Rotary liquid Chillers – Air-Cooled
Model RTAA
Literature Type Installation, Operation, Maintenance
Sequence 3
Date December 1991
File No. SV-RF-RLC-RTAA-IOM-3-1291
Supersedes
Installation RTAA-IOM-3
Operation
Maintenance
Since The Trane Company has a policy of continuous product improvement, it reserves the right to change
specifications and design without notice. The installation and servicing of the equipment referred in this booklet
should be done by qualified, experienced technicians.
Air-Cooled
Series R
®
Rotary Liquid
Chillers
“CO” and Later Design Sequence
Packaged Air-Cooled Chiller,
RTAA 130-400
Remote Evaporator Air-Cooled Chiller,
RTAA 130-200
Models
RTAA-130 RTAA-170 RTAA-240 RTAA-340
RTAA-140 RTAA-185 RTAA-270 RTAA-370
RTAA-155 RTAA-200 RTAA-300 RTAA-400
Part No. X39560468-01

Table of Contents

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Trane RTAA-170 Specifications

General IconGeneral
BrandTrane
ModelRTAA-170
CategoryChiller
LanguageEnglish

Summary

General Information

Unit Description

Refrigeration (Cooling) Cycle

Warnings and Cautions

Installation Responsibilities

Installation - Mechanical

Pre-installation

Instructions for reporting damage and providing an installation check sheet.

Location Requirements

Guidelines for selecting an appropriate installation location for the unit.

Foundation

Specifies requirements for mounting pads or concrete foundations supporting the unit.

Clearances

Details required clearances around the unit for installation and service access.

Rigging

Unit Isolation and Leveling

Water Treatment

Freeze Protection

Domestic Water Heater Piping

Freeze Protection

Steps to protect the domestic water heater system from freezing in subfreezing ambient temperatures.

Installation - Mechanical Remote Evaporator Interconnecting Refrigerant Piping

System Configuration

Explains system arrangements and elevation roles in determining line sizes.

Line Sizing

Liquid Line Sizing

Provides examples and tables for sizing liquid lines based on equivalent length.

Suction Line Sizing

Piping Installation Procedures

Leak Test and Evacuation

Refrigerant and Additional Oil Charge

Refrigerant Charge Determination

Explains how to determine the system's required refrigerant charge.

Oil Charge Determination

Describes how to calculate the amount of additional oil needed for field-installed piping.

Installation – Electrical

General Recommendations

Provides warnings and code compliance advice for electrical wiring.

Installer-Supplied Components

Interconnecting Wiring

Chilled Water Pump Interlock and External Auto/Stop for Model RTAA Air-Cooled Series R CenTraVac

Explains field-supplied inputs for pump interlock and external auto/stop functions.

Emergency Stop (Normal Trip)

External Chilled Water Setpoint (CWS): Remote Resistor/Potentiometer, Voltage Source 2-10 VDC, or Current Source 4-20 mA

1. Remote Resistor/Potentiometer Input (fixed or adjustable)

Details connecting a remote resistor/potentiometer for CWS, including calibration.

External Current Limit Setpoint (CLS): Remote Resistor/Potentiometer, Voltage Source 2-10 VDC or Current Source 4-20 mA

1. Remote Resistor/Potentiometer Input

Details connecting a remote resistor/potentiometer for CLS, including calibration.

Optional Bidirectional Communications Link (BCL)

Installation Check List

Operating Principles – Mechanical

Compressor Description

Details the motor and rotor components of the helical rotary compressor.

Compressor Loading Sequence

Explains how the UCM starts and balances compressor load based on demand.

Oil System Operation

Operating Principles – Adaptive Control™ Microprocessor Logic

Menus

Condition/Diagnostic Codes

Chiller Switch

Operational Features

Current Limit Setpoint

Explains how the UCM modulates slide valves to prevent exceeding the Current Limit Setpoint.

Low Ambient Lockout

Prevents unit start-up when outdoor air temperature is below the setpoint.

Electronic Expansion Valve (EXV) Test

Procedure to test the proper operation of the electronic expansion valve.

Current Overload Protection

Details how the UCM monitors compressor current to protect against overcurrent conditions.

Leaving Chilled Water Temperature Control

Explains how the UCM controls to the setpoint by staging compressors and modulating slide valves.

Chilled Water Reset (CWR)

Leaving Water Temperature Cutout

Low Refrigerant Temperature Cutout

Low Ambient Temperature Start

Low Refrigerant Temperature Cutout Retry

Auto Lead/Lag

Phase Imbalance Protection

Reverse Rotation Protection

2-10 VDC/4-20 made Input for External Chilled Water Setpoint (CWS) and Current Limit Setpoint (CLS)

Diagnostics and Troubleshooting

Table 18 Diagnostics and Troubleshooting Chart

Pre-Start Checkout

Unit Voltage Power Supply

Unit Voltage Imbalance

Unit Voltage Phasing

UCM Set-up

Start-Up Procedures

System Superheat

Explains how to measure and interpret normal superheat at full operating load.

System Subcooling

Details how to measure and interpret normal subcooling for each circuit.

Unit Shutdown Procedures

System Restart After Extended Shutdown

Periodic Maintenance

Refrigerant Emission Control

Weekly Maintenance

Monthly Maintenance

Annual Maintenance

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