Trane YSC120ED User Manual

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. When working on the equipment, observe all precautions in the literature
and on the tags, stickers, and labels that are attached to the equipment.
Packaged Rooftop Air Conditioners
Precedent™ — Gas/Electric
5–10Tons–50Hz
September 2012 RT-SVX38B-EN
Installation, Operation,
and Maintenance
Model Numbers
YSC060ED - YSC120ED

Trane YSC120ED Specifications

General

Model	YSC120ED
Category	Air Conditioner
Energy Efficiency Ratio (EER)	11.0
Refrigerant Type	R-410A
Compressor Type	Scroll
Power Supply	60 Hz

Summary

General Information

Unit Inspection and Storage

Procedures for unit inspection upon arrival and safe storage practices.

Unit Features and Controls

Overview of unit nameplate, description, ReliaTel, and ECA.

System Input Devices and Sensors

Details on various input devices, sensors, and control modules.

Installation

Pre-Installation Procedures

Safety and preparatory steps before unit installation.

Rigging and Foundation

Guidelines for rigging, center of gravity, and foundation requirements.

Ductwork and Roof Curb

Instructions for ductwork attachment and roof curb installation.

General Unit Requirements

Checklist of essential steps for successful unit installation.

TCO-1 Instructions

Procedure for replacing the TCO1 limit switch for horizontal discharge.

Horizontal Discharge Conversion

Steps to convert the unit for horizontal discharge airflow.

Condensate Drain Configuration

How to convert the condensate drain for front or base exit.

Field Installed Power Wiring

Requirements for proper field-installed power wiring and grounding.

Standard Wiring and Controls

Connecting unit power, 24VAC, and DC analog controls.

Pre-Start

Voltage Imbalance and Electrical Phasing

Checks for voltage imbalance and correct electrical phasing.

Compressor Crankcase Heaters

Importance and operation of optional compressor crankcase heaters.

ReliaTel™ Controls and Test Modes

Initial checks of ReliaTel controls and methods for testing components.

Unit Start-Up

Verifying Proper Air Flow

Procedures to verify correct airflow and fan settings.

Economizer Start-Up

Steps to start and set the economizer for minimum ventilation.

Compressor Start-Up

Procedures for starting compressors and checking operating pressures.

Gas Heat Units Start-Up

Steps for starting gas heat units and checking ignition.

Final System Setup

Final checks and configurations after start-up procedures.

Maintenance

Fan Belt Adjustment

How to adjust and maintain belt tension for belt-drive units.

Monthly and Seasonal Checks

Routine checks for filters, condensate, and seasonal operations.

Coil Cleaning and Hail Guard

Procedures for cleaning coils and removing/reinstalling hail guards.

Annual Maintenance

General maintenance tasks performed annually.

Trouble Shooting

ReliaTel™ Control Diagnostics

Using ReliaTel controls for diagnostics and system status.

System Status Checkout

Methods to check system status and interpret LED indicators.

Failure Diagnosis

Diagnosing heating, cooling, and service failures.

Resetting Lockouts

Procedures to reset cooling and ignition lockouts.

Zone Sensor and ECA Troubleshooting

Testing zone sensors and troubleshooting economizer controls.

Unit Wiring Diagrams Numbers

Unit Wiring Diagram Reference

Table listing unit wiring diagram numbers for reference.

Limited Warranty

Residential Use Warranty

Warranty details for residential use of specific models.

Commercial Use Warranty

Warranty details for commercial use of specific models.