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Trane Horizon OANG Series User Manual

Trane Horizon OANG Series
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Horizon™ Outdoor Air Unit
Indirect Fired Gas/Electric Heat/Air Source
Heat Pump
Installation, Operation, and Maintenance
June 2021
OAU-SVX006E-EN
Model :
OADG and OANG
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.
AVERTISSEMENT DE SÉCURITÉ
L’installation et l’entretien de cet équipement doivent être assurés exclusivement par du personnel qualifié.
L’installation, la mise en service et l’entretien d’équipements de chauffage, de ventilation et de climatisation (CVC)
présentent un danger et requièrent des connaissances et une formation spécifiques. Une installation, un réglage ou
une modification inappropriés d’un équipement par une personne non qualifiée peut provoquer des blessures graves,
voire la mort. Lors de toute intervention sur l’équipement, respectez les consignes de sécurité figurant dans la
documentation, ainsi que sur les pictogrammes, autocollants et étiquettes apposés sur l’équipement..
Important: Proper execution of the tasks outlined in this Installation, Operation, and Maintenance manual require and
assume the technician has been certified as a start up technician for the Horizon Outdoor Air unit. This
includes working knowledge of the Tracer TU program.

Table of Contents

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Trane Horizon OANG Series Specifications

General IconGeneral
BrandTrane
ModelHorizon OANG Series
CategoryHeat Pump
LanguageEnglish

Summary

Installation, Operation, and Maintenance

Safety Warnings and Precautions

Covers general safety warnings for installation, operation, and maintenance.

Introduction

Warnings, Cautions, and Notices

Explains safety advisories and their definitions.

Personal Protective Equipment (PPE)

PPE Requirements

Stresses the importance of wearing appropriate PPE to prevent injury.

EHS Policies and Refrigerant Handling

Environmental, Health, and Safety (EHS) Policies

Mandates adherence to company's EHS policies.

High Pressure Refrigerant Hazards

Warns about hazards of high-pressure refrigerant and proper handling.

Refrigerant Handling and Explosion Hazards

Highlights risks associated with refrigerant handling and potential explosions.

Hazardous Condition Warnings

Gas Leak and Flammability Hazards

Warns about gas leaks and immediate actions to take.

Improper Service Procedures Warning

Warns that improper service can cause damage, injury, or death.

Flammability Hazards

Warns about flammability of gasoline and vapors.

Model Number Descriptions

Unit Identification

Explains the structure of the unit's model number.

General Information

Model Number Description Reference

Directs users to the section explaining model number identification.

Unit Description

Details the unit's pre-shipment testing and general construction.

Indoor Fan Failure Input Function

Explains the function of the indoor fan failure input and system response.

Low Pressure Control Operation

Describes the low-pressure control input and its operation.

Refrigerant Circuit Features

Outlines standard features and capacity control for refrigerant circuits.

High Pressure Control Operation

Explains the high-pressure control and its interaction with RTRM.

Unit Components and Features

Modulating Indirect Fired Gas Burner

Describes the modulating gas heat system.

Through-Base Electrical with Disconnect

Explains the factory-installed disconnect switch.

Electric Heat Options

Describes the SCR-controlled electric heat options.

ERV Operation

Describes the operation of Energy Recovery Wheels.

Unit Specifications and Handling

Suction Pressure Monitoring

Details the standard suction pressure monitoring feature.

Head Pressure Control

Describes head pressure control via VFD.

Fiberglass Wool Hazard Warning

Warns about potential hazards of fiberglass wool insulation.

First Aid Measures

Provides first aid instructions for eye and skin contact.

Unit Clearances

Clearance Requirements

Explains the importance of maintaining proper clearances for operation and service.

Clearances, Dimensions, and Curb Data

Combustible Materials Warning

Warns about combustible materials and maintaining clearance.

OAD Unit Clearances

Refers to figures for installation clearances for OAD units.

OAN Unit Clearances

Refers to figures for installation clearances for OAN units.

Dimensional Data

Unit Weight and Rigging

Heavy Object Lifting Hazards

Warns about hazards associated with lifting heavy units.

Improper Lifting Technique Hazards

Highlights dangers of improper lifting techniques.

Rigging Procedures

Provides instructions for rigging the unit.

Installation Procedures

Ductwork Installation Guidance

Provides guidance on ductwork installation, including connectors.

Mandatory Elbow Requirement

Mandatory installation requirement for bottom discharge units with electric heat.

General Unit Installation Requirements

General Unit Installation Checklist

Lists essential checks and requirements for successful unit installation.

Main Electrical Power Requirements

Outlines requirements for connecting the unit's main electrical power supply.

Condensate Drain Configuration

Details the importance and installation of condensate traps and drain lines.

Utility Connections

Hot Water Connection Details

Specifies size and location for hot water connections.

Chilled Water Connection Details

Specifies size and location for chilled water connections.

Electrical Connections

Field Installed Power Wiring Warning

Warns about hazards and requirements for field wiring and grounding.

Main Unit Power

Hazardous Voltage Warning

Warns about the danger of live electrical components.

Copper Conductor Requirement

Specifies the exclusive use of copper conductors for connections.

Field Wiring and Grounding Requirements

Reiterates the importance of proper wiring and grounding.

Voltage Imbalance and Electrical Phasing

Live Electrical Components Warning

Warns about working with live electrical components.

Unit Power and Component Checks

Crankcase Heater Startup Procedure

Procedure for operating crankcase heaters before startup.

Main Unit Display and Control Module

Describes the function of the main display and control module.

Field-Installed Control Wiring Warning

Reiteration of proper wiring and grounding requirements.

Control Power Transformers and Wiring

24 Vac Control Wiring

Information on controls using 24 Vac signals.

DC Analog Input/Output Wiring

Information on controls using DC analog input/output signals.

DC Conductor Sizing and Wiring

Factory-Provided Sensor Installation

Information on factory-provided sensors and their installation.

Pre-Start Checklist

System Configuration and Pre-Start

Pre-Start Up Procedures

Startup Procedure Overview

Step-by-step guide for starting up the unit.

Cooling Start Up Steps

Step-by-step guide for cooling startup.

Startup Procedures

Indirect Fired Gas Heating Startup

Guidance for starting up the indirect fired gas heating system.

Hazardous Service Procedures Warning

Warns about hazards of service procedures.

Explosion Hazard Warning

Warns about explosion hazards during leak testing.

Gas Flow and Burner Operation

Confirm Gas Flow at Unit

Step to confirm gas flow at the unit.

Voltage and Gas Hazard Warning

Warns about hazards of voltage and gas during servicing.

Burner Starting Sequence

Describes the burner starting and ignition sequence.

Split Manifold High Fire Test

Procedure for testing split manifold high fire and burner.

Burner Flame Adjustment and Troubleshooting

High and Low Fire Adjustment

Instructions for adjusting high and low fire settings.

Ignition Failure Causes

Discusses potential causes and troubleshooting for ignition failures.

Flame Sensor Current Check

Meter Damage Warning

Warning about potential meter damage from incorrect voltage measurement.

Safety Controls

Air Pressure Switch Function

Explains the function of the air pressure switch.

Rollout Switch Operation

Describes the manual reset rollout switch for burner flame rollout.

High Limit Switch Function

Explains the high limit switch operation and its causes.

Maintenance Procedures

Monthly Maintenance Schedule

Covers monthly maintenance tasks.

Smoke Detector Maintenance

Details maintenance procedures for smoke detectors.

Condenser Coil Cleaning

Explains regular coil maintenance for unit efficiency.

Coil Cleaning Procedures

Round Tube Plate Fin (RTPF) Coil Cleaning

Specific instructions for cleaning RTPF coils.

Hazardous Chemicals Warning

Warns about hazardous chemicals used in coil cleaning.

Hazardous Pressures Warning

Warns about hazardous pressures within coils during cleaning.

General Data Tables

Refrigeration Circuit Diagrams

Alarms and Troubleshooting

Microprocessor Control Diagnostics

Explains how the microprocessor control provides diagnostics.

System Alarms Overview

Explains system alarms and how they are accessed.

Sensor Failure Alarm Display

How to display system sensor status.

RTRM Failure Modes

Lists causes for RTRM failure indications.

Condenser Fan VFD Troubleshooting

Troubleshooting guide for Condenser Fan Variable Frequency Drives.

System Failure Voltage Check

Procedure to check for system failure via voltage measurement.

Cooling Failure Voltage Check

Procedure to check for cooling failure via voltage measurement.

Appendix

OAU Filter Guide

Provides filter specifications for OAU units.

Factory-Provided Sensor Installation

Instructions for installing factory-provided sensors.

Sensor Specifications

Details specifications for the BAYSENS036A sensor.

Sensor Mounting Best Practices

Information on sensor dimensions and optimal placement.

Startup and Service Technician Information

Horizon UC600 v11.0 Release Notes

Information on the Horizon UC600 v11.0 software release.

Summary of Improvements

Summarizes improvements in the new version.

Suction Pressure Monitoring Improvements

Details improvements in suction pressure monitoring.

Compressor Status and Diagnostics Improvements

Explains improvements in compressor run status and diagnostics.

Point Name Updates for Tracer SC

Notes on updating point names for Tracer SC compatibility.

Evaporator Setpoint Reset Changes

Describes changes to evaporator setpoint reset during dehumidification.

Control Strategies and Diagnostics

Expanded Fallback Control

Explains fallback control methods when sensors fail.

Expanded Diagnostics List

Lists diagnostics for sensor failures and operational issues.

Sequence of Operation

Occupied Control Modes

Details occupied control modes and starting sequences.

Supply Fan Sequence

Describes the supply fan starting sequence.

Startup Form

Pre-Startup Checklist

Checklist of items to verify before unit startup.

Startup Verification Procedures

Indoor Fan Failure Switch Verification

Verifies the indoor fan failure switch operation.

Refrigeration Startup Test Procedures

Test Procedures for Refrigeration Circuits

Step-by-step test procedures for refrigeration circuits.

Programming and Commissioning

Program Control Type Selection

Selects the sequence of operation and system integration type.

Commissioning Procedure

Guidance on commissioning the unit using overrides.

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