Trane Horizon OABD Series Installation and operating instructions

Horizon™ Outdoor Air Unit
Horizon UC600 Controls Program Version 12.0
Installation, Operation, and Maintenance
February 2023 OAU-SVX007A-EN
Important: Proper completion 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.
Models OABD, OABE, OABF, OADG, OAGD, OAGE, OAGF, OAKD, OAKE, OAKF, OAND, OANE, OANF,
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.

©2023 Trane OAU-SVX007A-EN
Introduction
Read this manual thoroughly before operating or servicing this
unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as required.
Your personal safety and the proper operation of this machine
depend upon the strict observance of these precautions.
Important Environmental Concerns
Scientific research has shown that certain man-made chemi-
cals can affect the earth’s naturally occurring stratospheric
ozone layer when released to the atmosphere. In particular,
several of the identified chemicals that may affect the ozone
layer are refrigerants that contain Chlorine, Fluorine and Car-
bon (CFCs) and those containing Hydrogen, Chlorine, Fluo-
rine and Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the environ-
ment. Trane advocates the responsible handling of all refrig-
erants-including industry replacements for CFCs and HCFCs
such as saturated or unsaturated HFCs and HCFCs.
Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air con-
ditioning industry. All technicians who handle refrigerants must
be certified according to local rules. For the USA, the Federal
Clean Air Act (Section 608) sets forth the requirements for han-
dling, reclaiming, recovering and recycling of certain refriger-
ants and the equipment 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. Know the applicable
laws and follow them.
The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTION Indicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It could
also be used to alert against unsafe
practices.
NOTICE Indicates a situation that could result in
equipment or property-damage only
accidents.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field wir-
ing poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state/national electrical codes.
ATTENTION
Câblage et Mise à la Terre Appropriés
Champs Obligatoires!
Le non-respect du code pourrait entraîner la mort ou
grave blessure. Tout le câblage sur le terrain DOIT être
effectué par des personnes qualifiées personnel. Ter-
rain mal installé et mis à la terre le câblage pose des ris-
ques de FIRE et d’ÉLECTROCUTION. À evitez ces
risques, vous devez suivre les exigences pour l’instal-
lation et la mise à la terre du câblage de terrain comme
décrit dans NEC et vos codes électriques locaux/éta-
tiques/nationaux.

Introduction
OAU-SVX007A-EN 3
WARNING
Personal Protective Equipment (PPE)
Required!
Failure to wear proper PPE for the job being undertaken
could result in death or serious injury. Technicians, in
order to protect themselves from potential electrical,
mechanical, and chemical hazards, MUST follow pre-
cautions in this manual and on the tags, stickers, and
labels, as well as the instructions below:
• Before installing/servicing this unit, technicians
MUST put on all PPE required for the work being
undertaken (Examples; cut resistant gloves/sleeves,
butyl gloves, safety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Safety Data Sheets
(SDS) and OSHA guidelines for proper PPE.
• When working with or around hazardous chemicals,
ALWAYS refer to the appropriate SDS and OSHA/GHS
(Global Harmonized System of Classification and
Labeling of Chemicals) guidelines for information on
allowable personal exposure levels, proper
respiratory protection and handling instructions.
• If there is a risk of energized electrical contact, arc, or
flash, technicians MUST put on all PPE in accordance
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.
AVERTISSEMENT
Équipements de protection individuelle
(EPI) obligatoires!
En cas d’équipement de protection individuelle
inadapté au travail entrepris, les techniciens s’exposent
à des risques de blessures graves voire mortelles. Afin
de se prémunir d’éventuels risques électriques,
mécaniques et chimiques, les techniciens DOIVENT
respecter les consignes préconisées dans le présent
manuel, sur les étiquettes et les autocollants, ainsi que
les instructions suivantes:
• Avant d’installer/réparer cette unité, les techniciens
doivent IMPÉRATIVEMENT porter tout l’équipement
de protection individuelle (EPI) recommandé pour le
travail entrepris (exemples: gants/manchons
résistants aux coupures, gants en caoutchouc butyl,
lunettes de protection, casque de chantier/antichoc,
protection contre les chutes, EPI pour travaux
électriques et vêtements de protection contre les
arcs électriques). Consulter SYSTÉMATIQUEMENT
les fiches de données de sécurité et les directives de
l’OSHA pour connaître la liste des EPI adaptés.
• Lors d’une intervention avec ou à proximité de
produits chimiques dangereux, consulter
SYSTÉMATIQUEMENT les fiches de données de
sécurité appropriées et les directives de l’OSHA/du
SGH (système général harmonisé de classification et
d’étiquetage des produits chimiques) afin d’obtenir
des renseignements sur les niveaux admissibles
d’exposition personnelle, la protection respiratoire
adaptée et les recommandations de manipulation.
• En cas de risque d’éclair, d’arc électrique ou de
contact électrique avec un équipement électrique
sous tension, et AVANT de réparer l’unité, les
techniciens doivent IMPÉRATIVEMENT porter tout
l’équipement de protection individuelle (EPI)
conformément à l’OSHA, à la norme NFPA 70E ou à
toute autre exigence propre au pays pour la
protection contre les arcs électriques. NE JAMAIS
COMMUTER, DÉBRANCHER ou EFFECTUER DE
TEST DE TENSION SANS PORTER UN EPI POUR
TRAVAUX ÉLECTRIQUES OU UN VÊTEMENT DE
PROTECTION APPROPRIÉ CONTRE LES ARCS
ÉLECTRIQUES. IL CONVIENT DE S’ASSURER QUE
LES COMPTEURS ET ÉQUIPEMENTS ÉLECTRIQUES
CORRESPONDENT À LA TENSION NOMINALE
PRÉVUE.

Introduction
4 OAU-SVX007A-EN
WARNING
Refrigerant under High Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury
or equipment damage. System contains oil and refriger-
ant under high pressure. Recover refrigerant to relieve
pressure before opening the system. See unit name-
plate for refrigerant type. Do not use non-approved
refrigerants, refrigerant substitutes, or refrigerant addi-
tives.
AVERTISSEMENT
Fluide frigorigène sous haute pression!
Tout manquement aux instructions indiquées ci-des-
sous peut provoquer une explosion pouvant causer
des blessures graves voire mortelles ou des dom-
mages matériels. Le système contient de l’huile et du
fluide frigorigène sous haute pression. Avant d’ouvrir le
circuit, récupérez le fluide frigorigène pour éliminer
toute pression dans le circuit. Consultez la plaque con-
structeur de l’unité pour connaître le type de fluide frig-
origène employé. Utilisez uniquement des fluides
frigorigènes, substituts et additifs agréés.
WARNING
Hazard of Explosion and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
Never solder, braze or weld on refrigerant lines or any
unit components that are above atmospheric pressure
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of refriger-
ants and air under pressure may become combustible
in the presence of an ignition source leading to an
explosion. Excessive heat from soldering, brazing or
welding with refrigerant vapors present can form highly
toxic gases and extremely corrosive acids.
AVERTISSEMENT
Risque d’explosion et gaz mortels!
Le non-respect de toutes les consignes de manipula-
tion des fluides frigorigènes peut entraîner la mort ou
des blessures graves.
N’effectuez en aucune circonstance des opérations de
brasage ou de soudage sur des conduites de fluide frig-
origène ou des composants de l’unité sous pression ou
pouvant contenir du fluide frigorigène. Récupérez sys-
tématiquement le fluide frigorigène en respectant les
directives de la loi américaine sur la propreté de l’air
(Agence fédérale pour l’environnement) ou toute autre
réglementation nationale ou locale en vigueur. Après la
récupération du fluide frigorigène, utilisez de l’azote
déshydraté pour ramener le système à la pression
atmosphérique avant de l’ouvrir pour procéder aux
réparations. Les mélanges de fluide frigorigène et d’air
sous pression peuvent devenir combustibles en
présence d’une source d’inflammation et provoquer
une explosion. La chaleur excessive découlant de
travaux de soudage ou de brasage associée à la
présence de vapeurs de fluide frigorigène peut
entraîner la formation de gaz hautement toxiques et
d’acides extrêmement corrosifs.
WARNING
Follow EHS Policies!
Failure to follow instructions below could result in
death or serious injury.
• All Trane personnel must follow the company’s
Environmental, Health and Safety (EHS) policies
when performing work such as hot work, electrical,
fall protection, lockout/tagout, refrigerant handling,
etc. Where local regulations are more stringent than
these policies, those regulations supersede these
policies.
• Non-Trane personnel should always follow local
regulations.

Introduction
OAU-SVX007A-EN 5
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.
Trademarks
All trademarks referenced in this document are the trademarks
of their respective owners.
AVERTISSEMENT
Respecter les politiques EHS!
Lenon-respect des consignes suivantes peut être à
l’origine de blessures graves,voire mortelles.
• Tous les membres du personnel du groupe Trane
sont tenus de respecter les règles établies par Trane
en matière d’environnement, d’hygiène et de sécurité
(EHS) lors d’une intervention, notamment en cas de
travaux à chaud, de risque d’électrocution et de
chute, deprocédures de verrouillage/mise hors
service, de manipulation de fluide frigorigène, etc. Si
les réglementations locales sont plus strictes que les
règles imposées par le groupe, elles deviennent
prioritaires.
• Le personnel extérieur au groupe Trane est, quant à
lui, systématiquement tenu d’observer les
réglementations en vigueur à l’échelle locale.
WARNING
Hazard of Explosion and Deadly Gases!
Failure to follow instructions could result in death or
serious injury.
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
AVERTISSEMENT
Risque d’explosion et gaz mortels!
Le non-respect de toutes les consignes de sécurité ci-
dessous peut entraîner la mort ou des blessures
graves.
Si vous sentez une odeur de gaz:
1. Ouvrez les fenêtres.
2. Ne touches à aucun interrupteur.
3. Éteignez toute flamme nue.
4. Avertissez immédiatement votre fournisseur de gaz.
WARNING
Hazardous Service Procedures!
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury or
death. Read the installation, operating and mainte-
nance instructions thoroughly before installing or ser-
vicing this equipment.
AVERTISSEMENT
Procédures d’entretien dangereuses!
Une installation, un réglage, une modification, une
réparation ou un entretien incorrect peut entraîner des
dommages matériels, des blessures ou la mort. Lisez
attentivement les instructions d’installation, de
fonctionnement et d’entretien avant de procéder à
l’installation ou à l’entretien de cet équipement.
WARNING
Hazard of Explosion and Deadly Gases
Failure to follow instructions could result in death or
serious injury.
The use and storage of gasoline or other flammable
vapors and liquids in open containers in the vicinity of
this appliance is hazardous.
AVERTISSEMENT
Risque d’explosion et gaz mortels!
Le non-respect de toutes les consignes de sécurité ci-
dessous peut entraîner la mort ou des blessures
graves.
Il est dangereux d’utiliser ou d’entreposer de l’essence
ou autres liquides ou vapeurs inflammables dans des
récipients ouverts à proximité de cet appareil.

6 OAU-SVX007A-EN
Table of Contents
Model Number Descriptions . . . . . . . . . . . . . . . . 9
Horizon Outdoor Air Unit . . . . . . . . . . . . . . . . . 9
Model: OAK Rev5 and OAN Rev5 . . . . . . . . 9
Horizon Outdoor Air Unit . . . . . . . . . . . . . . . . 12
Model: OADG Rev6 and OANG Rev6 . . . . 12
Horizon Outdoor Air Unit . . . . . . . . . . . . . . . . 15
Model: OAB Rev5 and OAG Rev5 . . . . . . . 15
General Information . . . . . . . . . . . . . . . . . . . . . . 18
Overview of Manual . . . . . . . . . . . . . . . . . . 18
Model Number Description . . . . . . . . . . . . . 18
Unit Nameplate . . . . . . . . . . . . . . . . . . . . . 18
Compressor Nameplate . . . . . . . . . . . . . . . 18
Unit Description . . . . . . . . . . . . . . . . . . . . . 18
Indoor Fan Failure Input . . . . . . . . . . . . . . . 18
Low Pressure Control ReliaTel Control . . . 18
High Pressure Control ReliaTel Control . . . 18
Space Temperature/RH Sensor (Optional) 18
High Temperature Sensor . . . . . . . . . . . . . 18
Outdoor Air Temperature and Relative Humidity
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . 19
100 Percent Outdoor Air Hood with Damper and
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Modulating Indirect Fired Gas Burner . . . . 19
Through the Base Electrical with Disconnect
Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Through the Base Gas Piping . . . . . . . . . . 19
Hinged Access Doors . . . . . . . . . . . . . . . . . 19
Modulating Electric Heat . . . . . . . . . . . . . . 19
Supply and Exhaust Piezo Fan Rings . . . . 19
ERV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Hot Water Coils . . . . . . . . . . . . . . . . . . . . . 19
Suction Pressure Monitoring . . . . . . . . . . . 19
Outdoor and Return Air Dampers . . . . . . . 19
Exhaust Dampers . . . . . . . . . . . . . . . . . . . . 20
Primary Heaters . . . . . . . . . . . . . . . . . . . . . 20
Space Temperature/Humidity Sensor . . . . 21
Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Filter Status Switches . . . . . . . . . . . . . . . . . 22
Airflow Monitoring . . . . . . . . . . . . . . . . . . . .22
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . .23
First Aid Measures . . . . . . . . . . . . . . . . . . . .23
Unit Clearances . . . . . . . . . . . . . . . . . . . . . .23
Unit Clearances, Curb Dimensions, and Dimen-
sional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
OAK Units . . . . . . . . . . . . . . . . . . . . . . . . . .24
OAN Units . . . . . . . . . . . . . . . . . . . . . . . . . .27
Curb Dimensions . . . . . . . . . . . . . . . . . . . . .28
Dimensional Data . . . . . . . . . . . . . . . . . . . . .29
OAB Units . . . . . . . . . . . . . . . . . . . . . . . . . .31
Indirect-Fired OAG Units . . . . . . . . . . . . . . .33
Outdoor WSHP Units . . . . . . . . . . . . . . . . . . .36
OABE Units . . . . . . . . . . . . . . . . . . . . . . . . .36
Indirect-Fired OAGE Units . . . . . . . . . . . . . .38
OAKE Units . . . . . . . . . . . . . . . . . . . . . . . . .41
OANE Units . . . . . . . . . . . . . . . . . . . . . . . . .43
Curb Dimensions . . . . . . . . . . . . . . . . . . . . .44
Dimensional Data . . . . . . . . . . . . . . . . . . . . .45
Indoor WSHP Units . . . . . . . . . . . . . . . . . . . . .46
OABE Units . . . . . . . . . . . . . . . . . . . . . . . . .46
OAGE Units . . . . . . . . . . . . . . . . . . . . . . . . .47
OAKE Units . . . . . . . . . . . . . . . . . . . . . . . . .49
OANE Units . . . . . . . . . . . . . . . . . . . . . . . . .50
OAD Units . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Unit Clearances . . . . . . . . . . . . . . . . . . . . . .52
Curb Dimensions . . . . . . . . . . . . . . . . . . . . .53
Dimensional Data . . . . . . . . . . . . . . . . . . . . .54
OAN Units . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Unit Clearances . . . . . . . . . . . . . . . . . . . . . .57
Curb Dimensions . . . . . . . . . . . . . . . . . . . . .57
Dimensional Data . . . . . . . . . . . . . . . . . . . . .59
Unit Weight and Rigging . . . . . . . . . . . . . . . . . . .62
Unit Weight . . . . . . . . . . . . . . . . . . . . . . . . .62
Corner Weight . . . . . . . . . . . . . . . . . . . . . . .64
Corner Weight . . . . . . . . . . . . . . . . . . . . . . .66
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

Table of Contents
OAU-SVX007A-EN 7
Unit Weight . . . . . . . . . . . . . . . . . . . . . . . . . 68
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Units with Indirect Fired Gas Heat . . . . . . . 74
General Unit Requirements . . . . . . . . . . . . 75
Condensate Drain Configuration . . . . . . . . 75
Main Electrical Power Requirements . . . . . 76
Hot Water Control Valve Wiring . . . . . . . . . 76
Chilled Water Connection Size and Location 76
Filter Installation . . . . . . . . . . . . . . . . . . . . . 77
Opening the Collapsed Exhaust Damper Hood
77
Field Installed Power Wiring . . . . . . . . . . . . 78
Horizon Water Source Heat Pump Field Connec-
tion Instructions . . . . . . . . . . . . . . . . . . . . . 79
OAB IF Heater Air Inlet Hood and Flue Assembly
Instructions for Outdoor Installations . . . . . 80
Venting of Furnace for Indoor Installations 82
Hot Water Connection Size and Location . 84
Main Unit Power . . . . . . . . . . . . . . . . . . . . . . . 85
Standard Wiring . . . . . . . . . . . . . . . . . . . . . 85
Voltage Imbalance . . . . . . . . . . . . . . . . . . . 85
Electrical Phasing (Three-Phase Motors) . 86
Compressor Crankcase Heaters . . . . . . . . 87
Main Unit Display and ReliaTel Controls . . 87
Field-Installed Control Wiring . . . . . . . . . . . 87
Control Power Transformer . . . . . . . . . . . . 87
Controls Using 24 Vac . . . . . . . . . . . . . . . . 88
Controls Using DC Analog Input/Output (Stan-
dard Low Voltage Multiconductor Wire) . . . 88
DC Conductors . . . . . . . . . . . . . . . . . . . . . . . . 89
Factory-Provided Sensors . . . . . . . . . . . . . . . 89
Pre-Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Cooling Start-Up . . . . . . . . . . . . . . . . . . . . . . 90
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Indirect Fired Gas Heating Start-Up . . . . . . . 92
Start-Up Procedure . . . . . . . . . . . . . . . . . . 93
Safety Controls . . . . . . . . . . . . . . . . . . . . . . 95
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Monthly Maintenance . . . . . . . . . . . . . . . . . . .96
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Filter Installation . . . . . . . . . . . . . . . . . . . . . .96
Supply/Return Air Smoke Detector Maintenance
96
Cooling Season . . . . . . . . . . . . . . . . . . . . . .96
Heating Season . . . . . . . . . . . . . . . . . . . . . .96
Condenser Coil Cleaning . . . . . . . . . . . . . . .97
Final Process . . . . . . . . . . . . . . . . . . . . . . . . . .98
Alarms and Troubleshooting . . . . . . . . . . . . . . .99
Microprocessor Control . . . . . . . . . . . . . . . .99
System Alarms . . . . . . . . . . . . . . . . . . . . . . .99
Sensor Failure Alarm Display . . . . . . . . . . .99
RTRM Failure Modes . . . . . . . . . . . . . . . . .100
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
OAU Filter Guide . . . . . . . . . . . . . . . . . . . . . .106
Field Installation of Factory-Provided Sensors .
108
Sequence of Operation v12.0 . . . . . . . . . . . . .114
Occupied Control . . . . . . . . . . . . . . . . . . . .114
Supply Fan Operation . . . . . . . . . . . . . . . .114
Economizer Operation . . . . . . . . . . . . . . . .114
Ventilation Mode . . . . . . . . . . . . . . . . . . . .115
Dehumidification Mode . . . . . . . . . . . . . . .115
Heating and Cooling Mode . . . . . . . . . . . .117
Heating Mode . . . . . . . . . . . . . . . . . . . . . . .117
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . .117
Exhaust Fan Starting Sequence . . . . . . . .117
Exhaust Fan Operation . . . . . . . . . . . . . . .117
Energy Recovery Wheel (ERV) . . . . . . . . .118
Additional Details on Operation . . . . . . . . .118
Evaporator Coil Frost Protection . . . . . . . .118
Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . .118
Heat Pump Operation . . . . . . . . . . . . . . . .119
Air Source Heat Pumps . . . . . . . . . . . . . . .119
Split/Dual Exhaust and Return Air Paths . .120
Start-Up Form . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Trane® Horizon™ DOAS . . . . . . . . . . . . . . .121
Pre-Startup Checklist . . . . . . . . . . . . . . . . . .121

8 OAU-SVX007A-EN
Table of Contents
Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Motor Data . . . . . . . . . . . . . . . . . . . . . . . . 122
Compressor Data . . . . . . . . . . . . . . . . . . . 122
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . 122
Refrigeration Startup . . . . . . . . . . . . . . . . . . 123
Test Procedures . . . . . . . . . . . . . . . . . . . . 123
Indirect Fired Gas Heat Start-Up . . . . . . . . 124
Furnace Data . . . . . . . . . . . . . . . . . . . . . . 124
Gas Pressure Settings . . . . . . . . . . . . . . . 124
Electric Heat Start-Up . . . . . . . . . . . . . . . . . 124
Heater Data . . . . . . . . . . . . . . . . . . . . . . . 124
Direct Fired Gas heat Start-up . . . . . . . . . . 125
Final Notes . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . 127
1-year Manufacturer Parts Warranty . . . . . 127
Horizon Models . . . . . . . . . . . . . . . . . . . . 127

OAU-SVX007A-EN 9
Model Number Descriptions
Horizon Outdoor Air Unit
Model: OAK Rev5 and OAN
Rev5
Digit 1, 2 — Unit Type
OA = Outdoor Air
Digit 3 — Cabinet Size
K = 1,500 CFM–9,000 CFM
N = 3,750 CFM–13,500 CFM
Digit 4 — Major Design Sequence
C = Revision 4
D = Revision 5
E = Heat Pump
F = Indoor WSHP
Digit 5, 6, 7 — Normal Gross
Cooling Capacity (MBh)
000 = No Cooling
144 = 12 Tons High Efficiency
180 = 15 Tons High Efficiency
210 = 17 Tons High Efficiency
240 = 20 Tons High Efficiency
264 = 22 Tons High Efficiency
300 = 25 Tons High Efficiency
360 = 30 Tons High Efficiency
420 = 35 Tons High Efficiency
480 = 40 Tons High Efficiency
540 = 45 Tons High Efficiency
600 = 50 Tons High Efficiency
648 = 54 Tons High Efficiency
720 = 60 Tons High Efficiency
Digit 8 — Minor Design Sequence
A = Vertical Discharge/Vertical Return
B = Vertical Discharge/
Horizontal Return
C = Horizontal Discharge/
Vertical Return
D = Horizontal Discharge/
Horizontal Return
E = Vertical Discharge/No Return
F = Horizontal Discharge/No Return
G = Vertical Discharge/
Split Vertical Return-Exhaust
H = Horizontal Discharge/
Split Vertical Return-Exhaust
Digit 9 — Voltage Selection
3 = 208-230/60/3
4 = 460/60/3
5 = 575/60/3
Digit 10 — Reserved for Future Use
Digit 11 — Evaporator Type
0 = No Cooling
B = DX 4-Row
C = DX 4-Row Interlaced
D = DX 6-Row Interlaced
F = Glycol/Chilled Water Coil
Digit 12 — Hot Gas Reheat
0 = No HGRH
1 = Fin and Tube Modulating
2 = Fin and Tube On/Off
Digit 13 — Compressor
0 = No Compressors
A = Scroll Compressors
B = Digital Scroll (1st Circuit Only)
C = Digital Scroll (1st and 2nd Circuit)
D = Variable Speed Scroll (1st
Circuit Only)
E = Variable Speed Scroll (1st and
2nd Circuit)
F = Scroll Compressors w/Sound
Attenuation Package
G = Digital Scroll (1st Circuit Only)
w/Sound Attenuation Package
H = Digital Scroll (1st Circuit and
2nd Circuit) w/Sound Attenuation
Package
J = Variable Speed Scroll (1st Circuit
Only) w/Sound Attenuation
Package
K = Variable Speed Scroll (1st Circuit
and 2nd Circuit) w/Sound
Attenuation Package
L = Variable Speed Scroll (1st
Circuit), Digital Scroll (2nd
Circuit)
M = Variable Speed Scroll (1st
Circuit), Digital Scroll (2nd
Circuit) w/Sound Attenuation
Package
Digit 14 — Condenser
0 = No Condenser
1 = Air-Cooled Fin and Tube
2 = Air-Cooled Fin and Tube
w/Head Pressure On/Off Control
3 = Water Cooled DX Condenser
Copper/Steel
4 = Air-Cooled Fin and Tube
w/Head Pressure Variable Speed
8 = Water Cooled DX Condenser
Copper/Nickel
Digit 15 — Refrigerant Capacity
Control
0 = No RCC Valve
A = RCC Valve on 1st Circuit
Digit 16 — Indoor Fan Motor (IFM)
0 = Direct Drive w/VFD
1 = Direct Drive (VFD by Others)
4 = Direct Drive w/Shaft Grounding
Ring w/VFD
5 = Special Motor Option
Digit 17 — Indoor Fan Wheel
A = 120
B = 120.6
C = 140
D = 140.6
E = 160
F = 160.6
G = 180
H = 180.6
J = 200
K = 200.6
L = 180 X 2
M = 180.6 X 2
Digit 18 — Indoor Fan Motor Power
(hp)
E = 1 hp –1800 rpm
F = 1 hp – 3600 rpm
G = 1.5 hp – 1800 rpm
H = 1.5 hp – 3600 rpm
J = 2 hp – 1800 rpm
K = 2 hp – 3600 rpm
L = 3 hp – 1800 rpm
M = 3 hp – 3600 rpm
N = 5 hp – 1800 rpm
P = 5 hp – 3600 rpm
R = 7.5 hp – 1800 rpm
S = 7.5 hp – 3600 rpm
T = 10 hp – 1800 rpm
U = 10 hp – 3600 rpm
V = 15 hp – 1800 rpm
W = 15 hp – 3600 rpm
Digit 19 — Reserved for Future Use
Digit 20 — Heat Type (PRI/SEC)
0 = No Heat
A = Indirect-Fired (IF)
C = Electric – Stage
D = Electric – SCR Modulating
G = Dual Fuel (PRI-IF/SEC-ELEC)
H = Dual Fuel (PRI-ELEC/SEC-ELEC)
J = Hot Water
L = No Primary Heat, Secondary ELEC
N = Dual Fuel (PRI-ELEC-STAGED/
SEC-ELEC)
Digit 21 — Primary Fuel Type
0 = No Heat
1 = Natural Gas
2 = Propane
3 = Electric – Open Coil
5 = Hot Water
7 = Natural Gas - 81% Eff.
8 = Propane - 81% Eff.

Model Number Descriptions
10 OAU-SVX007A-EN
Digit 22 — Heat Capacity (Primary
Heat Source)
Digit 23 — Heat Capacity
(Secondary Heat Source)
Digit 24 — Corrosive Environment
Package
0 = No Corrosive Package
1 = S/S Interior, S/S Evap Coil Casing
2 = S/S Interior, Eco Coated Coils
3 = S/S Interior,
Copper/Copper Evap Coil
4 = S/S Coil Casing
5 = S/S Interior Casing
6 = Eco-Coated Coils
7 = S/S Coil Casing with
Eco-Coated Coils
8 = Copper/Copper Evap,
HGRH Coils
9 = Corrosion Resistant Package
Digit 25, 26 — Unit Controls
00 = Non-DDC – Electromechanical
AC = Trane – Discharge Air Control
w/BACnet® (No Display)
AD = Trane – Space Control
w/BACnet (No Display)
AF = Trane – Discharge Air Control
w/BACnet w/Display
AG = Trane – Space Control
w/BACnet w/Display
AL = Trane – Multi-Zone VAV Control
w/BACnet w/Display
AN = Trane – Multi-Zone VAV Control
w/BACnet (No Display)
AP = Trane – Single-Zone VAV Control
w/BACnet w/Display
AR = Trane – Single-Zone VAV Control
w/BACnet (No Display)
BB = Trane – Space Control w/BACnet
(No Display) w/Thumbwheel
BC = Trane – Space Control w/BACnet
w/Display w/Thumbwheel
BG = Trane – Single-Zone VAV Control
w/BACnet w/Display w/
Thumbwheel
BJ = Trane – Single-Zone VAV Control
w/BACnet (No Display) w/
Thumbwheel
CA = Trane – Lab Space Control w/
BACnet (No Display)
CB = Trane – Lab Space Control w/
BACnet w/Display
CC = Trane – Lab Discharge Air Control
w/BACnet (No Display)
CD = Trane – Lab Discharge Air Control
w/BACnet w/Display
CE = Trane – Lab Multi-Zone VAV
Control w/BACnet (No Display)
CF = Trane – Lab Multi-Zone VAV
Control w/BACnet w/Display
CG = Trane – Lab Space Control w/
BACnet (No Display) w/
Thumbwheel
CH = Trane – Lab Space Control w/
BACnet w/Display w/Thumbwheel
DA = Trane – Horizon Thrive Control w/
BACnet (No Display)
DB = Trane – Horizon Thrive Control w/
BACnet w/Display
XX = Control Special
Digit 27 — Powered Exhaust Fan
Motor (PFM) and Exhaust Dampers
0 = No Powered Exhaust
1 = Direct Drive w/VFD and Gravity
Dampers
2 = Direct Drive (VFD by Others)
5 = Special Motor Option
6 = Direct Drive w/VFD and
Barometric Relief Damper
7 = Direct Drive w/VFD and Isolation
Dampers w/End Switch
8 = Barometric Relief Dampers
(NO PFM)
Digit 28 — Powered Exhaust Fan
Wheel
0 = No Powered Exhaust
A = 120
B = 120.6
C = 140
D = 140.6
E = 160
F = 160.6
G = 180
H = 180.6
J = 200
K = 200.6
L = 180 X 2
M = 180.6 X 2
Digit 29 — Powered Exhaust Fan
Motor Power
0 = No Powered Exhaust
E = 1 hp – 1800 rpm
F = 1 hp – 3600 rpm
G = 1.5 hp – 1800 rpm
H = 1.5 hp – 3600 rpm
J = 2 hp – 1800 rpm
K = 2 hp – 3600 rpm
L = 3 hp – 1800 rpm
M = 3 hp – 3600 rpm
N = 5 hp – 1800 rpm
P = 5 hp – 3600 rpm
R = 7.5 hp – 1800 rpm
S = 7.5 hp – 3600 rpm
T = 10 hp – 1800 rpm
U = 10 hp – 3600 rpm
V = 15 hp – 1800 rpm
W = 15 hp – 3600 rpm
Digit 30 — UC600 Hardware
Template
- = Prior to v8.0
1 = v8.X, v9.X, or v10.X
2 = v11.0 / Thrive v2.1
3 = v11.1 - v11.3 / Thrive v2.1
4 = v12.0 / Thrive v2.2
Digit 31 — ERV (Requires Powered
Exhaust)
0 = No ERV
A = ERV – Composite Construction
B = ERV – Composite Construction
with Frost Protection w/VFD
C = ERV – Composite Construction
with Bypass
D = ERV – Composite Construction
with Frost Protection and Bypass
E = ERV – Aluminum Construction
F = ERV – Aluminum Construction
with Frost Protection w/VFD
IF ELEC Hot Water
0 = No Heat No Heat No Heat
A = 50 MBh 10 kW 1 Row/10 FPI
B = 75 MBh 20 kW 1 Row/12 FPI
C = 100 MBh 24 kW 1 Row/14 FPI
D = 125 MBh 28 kW 2 Row/10 FPI
E = 150 MBh 32 kW 2 Row/12 FPI
F = 200 MBh 40 kW 2 Row/14 FPI
G = 250 MBh 48 kW 3 Row/10 FPI
H = 300 MBh 60 kW 3 Row/12 FPI
J = 350 MBh 68 kW 3 Row/14 FPI
K = 400 MBh 79 kW
L = 500 MBh 99 kW
M = 600 MBh 111 kW
N = 700 MBh 119 kW
P = 800 MBh 139 kW
R = 1000 MBh 159 kW
S = 179 kW
T = 199 kW
U = 215 kW
X = Special Heater Option
IF ELEC
0 = No Secondary
Heat
No Secondary Heat
A = 50 MBh 10 kW
B = 75 MBh 20 kW
C = 100 MBh 24 kW
D = 125 MBh 28 kW
E = 150 MBh 32 kW
F = 200 MBh 40 kW
G = 250 MBh 48 kW
H = 300 MBh 60 kW
J = 350 MBh 68 kW
K = 400 MBh 79 kW
L = 500 MBh 99 kW
M = 600 MBh 111 kW
N = 700 MBh 119 kW
P = 800 MBh 139 kW
R = 1000 MBh 159 kW
S = 179 kW
T = 199 kW
U = 215 kW