Trane Horizon OABE/F Series Installation and operating instructions

Horizon™ Outdoor Air Unit
Water Source Heat Pump
Models: OABE/F, OAGE/F, OAKE/F, OANE/F
Installation, Operation, and Maintenance
June 2023 OAU-SVX004G-EN
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.

©2023 Trane OAU-SVX004G-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
chemicals 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 Carbon (CFCs) and those containing Hydrogen, Chlorine,
Fluorine and Carbon (HCFCs). Not all refrigerants containing
these compounds have the same potential impact to the
environment. Trane advocates the responsible handling of all
refrigerants.
Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle refrigerants
must be certified according to local rules. For the USA, the
Federal Clean AirAct (Section 608) sets forth the requirements
for handling, reclaiming, recovering and recycling of certain
refrigerants 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.
CAUTIONsIndicates 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
wiring 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.
AVERTISSEMENT
Câblage sur site et mise à la terre
corrects nécessaires !
Le non-respect de la réglementation peut entraîner des
blessures graves, voire mortelles. Il est IMPÉRATIF de
confier l’ensemble du câblage sur site à un électricien
qualifié. Un câblage sur site mal installé ou mal mis à la
terre constitue des risques D’INCENDIE et
D’ÉLECTROCUTION. Pour éviter ces risques, il est
IMPÉRATIF de respecter les obligations en matière de
pose de câblage sur site et de mise à la terre tel que
stipulé dans les règles du NEC et dans les
réglementations électriques locales/nationales.

Introduction
OAU-SVX004G-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
precautions 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
4OAU-SVX004G-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
refrigerant under high pressure. Recover refrigerant to
relieve pressure before opening the system. See unit
nameplate for refrigerant type. Do not use non-
approved refrigerants, refrigerant substitutes, or
refrigerant additives.
AVERTISSEMENT
Fluide frigorigène sous haute pression !
Tout manquement aux instructions indiquées ci-
dessous peut provoquer une explosion pouvant causer
des blessures graves voire mortelles ou des
dommages 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 constructeur de l’unité pour connaître le type de
fluide frigorigène 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
refrigerants 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 manipulation
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
frigorigène ou des composants de l’unité sous pression
ou pouvant contenir du fluide frigorigène. Récupérez
systématiquement 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-SVX004G-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 maintenance
instructions thoroughly before installing or servicing
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.

6OAU-SVX004G-EN
Table of Contents
Model Number Descriptions . . . . . . . . . . . . . . . . 9
Horizon Outdoor Air Unit Water Source Heat
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Model: OABE, OAGE . . . . . . . . . . . . . . . . . . 9
Models: OADE, OAKE, OANE . . . . . . . . . . 11
General Information . . . . . . . . . . . . . . . . . . . . . . 14
Overview of Manual . . . . . . . . . . . . . . . . . . 14
Model Number Description . . . . . . . . . . . . . 14
Unit Nameplate . . . . . . . . . . . . . . . . . . . . . 14
Compressor Nameplate . . . . . . . . . . . . . . . 14
Unit Description . . . . . . . . . . . . . . . . . . . . . 14
Indoor Fan Failure Input . . . . . . . . . . . . . . . 14
Low Pressure Control ReliaTel Control . . . 14
Refrigerant Circuits . . . . . . . . . . . . . . . . . . 14
High Pressure Control ReliaTel Control . . . 14
Space Temperature / RH Sensor (Optional) 14
High Temperature Sensor . . . . . . . . . . . . . 15
Outdoor Air Temperature and Relative Humidity
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . 15
100 Percent Outdoor Air Hood with Damper and
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Modulating Indirect Gas-Fired Burner . . . . 15
Through the Base Electrical with Disconnect
Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Through the Base Gas Piping . . . . . . . . . . 15
Hinged Access Doors . . . . . . . . . . . . . . . . . 15
Electric Heat . . . . . . . . . . . . . . . . . . . . . . . 15
Supply and Exhaust Piezo Fan Rings . . . . 15
ERV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Hot Water Coils . . . . . . . . . . . . . . . . . . . . . 15
Suction Pressure Monitoring . . . . . . . . . . . 15
Head Pressure Control . . . . . . . . . . . . . . . . 15
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . 16
First Aid Measures . . . . . . . . . . . . . . . . . . . 16
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Unit Clearances . . . . . . . . . . . . . . . . . . . . . 16
Unit Clearances, Curb Dimensions, and Dimen-
sional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Outdoor WSHP Units . . . . . . . . . . . . . . . . . . . 17
OABE Units . . . . . . . . . . . . . . . . . . . . . . . . .17
Indirect-Fired OAGE Units . . . . . . . . . . . . . .19
OAKE Units . . . . . . . . . . . . . . . . . . . . . . . . .22
OANE Units . . . . . . . . . . . . . . . . . . . . . . . . .24
Indoor WSHP Units . . . . . . . . . . . . . . . . . . . . .26
OABE Units . . . . . . . . . . . . . . . . . . . . . . . . .26
OAGE Units . . . . . . . . . . . . . . . . . . . . . . . . .27
OAKE Units . . . . . . . . . . . . . . . . . . . . . . . . .29
OANE Units . . . . . . . . . . . . . . . . . . . . . . . . .30
Unit Weight and Rigging . . . . . . . . . . . . . . . . . . .33
Unit Weight . . . . . . . . . . . . . . . . . . . . . . . . .33
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Units with Indirect Fired Gas Heat . . . . . . . .37
General Unit Requirements . . . . . . . . . . . . .38
Horizon Water Source Heat Pump Field Connec-
tion Instructions . . . . . . . . . . . . . . . . . . . . . .38
OAB IF Heater Air Inlet Hood and Flue Assembly
Instructions for Outdoor Installations . . . . . .39
Venting of Furnace for Indoor Installations .41
Main Electrical Power Requirements . . . . . .43
Condensate Drain Configuration . . . . . . . . .43
Chilled Water Connection Size and Location 44
Filter Installation . . . . . . . . . . . . . . . . . . . . . .44
Opening the Collapsed Exhaust Damper Hood
45
Field Installed Power Wiring . . . . . . . . . . . .46
Main Unit Power . . . . . . . . . . . . . . . . . . . . . . .48
Standard Wiring . . . . . . . . . . . . . . . . . . . . . .48
Voltage Imbalance . . . . . . . . . . . . . . . . . . . .49
Electrical Phasing (Three-Phase Motors) . .50
Compressor Crankcase Heaters . . . . . . . . .50
Main Unit Display and ReliaTel Controls . . .51
Field-Installed Control Wiring . . . . . . . . . . . .51
Control Power Transformer . . . . . . . . . . . . .51
Controls Using 24 Vac . . . . . . . . . . . . . . . . .51
Controls Using DC Analog Input/Output (Stan-
dard Low Voltage Multiconductor Wire) . . . .52

Table of Contents
OAU-SVX004G-EN 7
DC Conductors . . . . . . . . . . . . . . . . . . . . . . . . 52
Factory-Provided Sensors . . . . . . . . . . . . . . . 53
Pre-Start Check List . . . . . . . . . . . . . . . . . . . . . . 54
System Configuration and Pre-Start . . . . . . . . 55
Pre-Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Cooling Start-up . . . . . . . . . . . . . . . . . . . . . 65
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Indirect Gas-Fired Heating Start-up . . . . . . . 67
Start-up Procedure . . . . . . . . . . . . . . . . . . . 68
Safety Controls . . . . . . . . . . . . . . . . . . . . . . 71
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Monthly Maintenance . . . . . . . . . . . . . . . . . . 72
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Supply/Return Air Smoke Detector Maintenance
72
Cooling/Heating Season . . . . . . . . . . . . . . 72
Evaporator Coil Cleaning . . . . . . . . . . . . . . 72
Final Process . . . . . . . . . . . . . . . . . . . . . . . . . 73
Performance Data . . . . . . . . . . . . . . . . . . . . . . . 74
Superheat and Refrigeration Circuit Data . . 81
Alarms and Troubleshooting . . . . . . . . . . . . . . . 85
Microprocessor Control . . . . . . . . . . . . . . . 85
System Alarms . . . . . . . . . . . . . . . . . . . . . . 85
Sensor Failure Alarm Display . . . . . . . . . . . 85
RTRM Failure Modes . . . . . . . . . . . . . . . . . 89
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
OAU Filter Guide . . . . . . . . . . . . . . . . . . . . . . 90
Field Installation of Factory-Provided Sensors 91
Attention Start-up or Service Technician . . . . 93
Horizon UC600 v11.0 Released . . . . . . . . . 93
Documents Included in this Packet: . . . . . . 93
Unchanged from Previous Versions: . . . . . 93
Summary of Improvements . . . . . . . . . . . . . . 93
Suction Pressure Monitoring . . . . . . . . . . . 93
Compressor Run Status and Diagnostics . 93
Updated Point Names to Match Tracer SC 93
Evaporator Leaving Temperature Setpoint Re-
set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Minimum Supply Airflow Setpoints . . . . . . . 93
Gas Heater Staging Off at Minimum Capacity .
93
Reduced Hot Gas Reheat Purge Mode . . . .93
Unit Shutdown Due to Condensate Overflow 93
Liquid Line Pressure Setpoint Reset . . . . . .93
Modulating ERV Exhaust and Outdoor Air By-
pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Space Control or Single Zone VAV and OA Set-
points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Discharge Air Temp. Reset for Single Zone VAV
94
Supply Fan Tracking for Exhaust Fan (Field En-
abled) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Hot Water Reheat . . . . . . . . . . . . . . . . . . . .94
Expanded Fallback Control . . . . . . . . . . . . .94
Sequence of Operation . . . . . . . . . . . . . . . . . . . .95
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Program-Controlled Setpoints . . . . . . . . . . . .95
Space Control and Single Zone VAV
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Discharge Air Control and Multi-Zone VAV Con-
trol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Occupied Control . . . . . . . . . . . . . . . . . . . . . . .95
Starting Sequence . . . . . . . . . . . . . . . . . . . .95
Supply Fan Sequence . . . . . . . . . . . . . . . . .95
Economizer Mode . . . . . . . . . . . . . . . . . . . . . .96
Ventilation Mode . . . . . . . . . . . . . . . . . . . . . . .96
Discharge Air Control . . . . . . . . . . . . . . . . . .96
Multi-Zone VAV Control . . . . . . . . . . . . . . . .96
Space Control . . . . . . . . . . . . . . . . . . . . . . .96
Single Zone VAV Control . . . . . . . . . . . . . . .96
Primary Heating Mode . . . . . . . . . . . . . . . . . . .96
Discharge Air Control . . . . . . . . . . . . . . . . . .96
Multi-Zone VAV Control . . . . . . . . . . . . . . . .96
Space Control or Single Zone VAV Control, with
Energy Recovery Wheel or has Mixed Air . .96
Space Control or Single Zone VAV Control with
No Energy Recovery Wheel and 100% Outdoor
Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Gas Heat Ignition Failure . . . . . . . . . . . . . . .97
Heat Pump Heating Mode . . . . . . . . . . . . . . . .97
Water Source Heat Pump . . . . . . . . . . . . . .97
Air Source Heat Pump – Demand Defrost Con-

8OAU-SVX004G-EN
Table of Contents
trol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . . . . 97
Discharge Air Control . . . . . . . . . . . . . . . . . 97
Multi-Zone VAV Control . . . . . . . . . . . . . . . 97
Space Control or Single Zone VAV Control, with
Energy Recovery Wheel or has Mixed Air . 98
Space Control or Single Zone VAV Control with
No Energy Recovery Wheel and 100% Outdoor
Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Compressor Low Ambient Lockout . . . . . . 98
Evaporator Frost Protection . . . . . . . . . . . . 98
Dehumidification Mode . . . . . . . . . . . . . . . . . 98
Discharge Air Control . . . . . . . . . . . . . . . . . 98
Multi-Zone VAV Control . . . . . . . . . . . . . . . 98
Space Control with Energy Recovery Wheel or
has Mixed Air . . . . . . . . . . . . . . . . . . . . . . . 98
Space Control with No Energy Recovery Wheel
and 100% Outdoor Air . . . . . . . . . . . . . . . . 98
Hot Gas Reheat Purge . . . . . . . . . . . . . . . . 98
Supplemental Electric Reheat (Not Included in
Standard Operation) . . . . . . . . . . . . . . . . . . 98
Supplemental Hot Water Reheat . . . . . . . . 99
Hot Water Reheat (No Hot Gas Reheat Installed)
99
Exhaust Fan Operation . . . . . . . . . . . . . . . . . 99
With Isolation Exhaust Fan Damper(s) . . . 99
Without Isolation Exhaust Fan Dampers . . 99
With Modulating OA/RA Dampers . . . . . . . 99
ECM Exhaust with 2-Position OA Damper . 99
VFD Exhaust with 2-Position OA Damper . 99
Energy Recovery Wheel Operation (ERV) . . 99
Energy Wheel Without VFD . . . . . . . . . . . . 99
Energy Wheel With VFD . . . . . . . . . . . . . . 99
Additional Features . . . . . . . . . . . . . . . . . . . . 99
Electric Pre-Heat . . . . . . . . . . . . . . . . . . . . 99
Space Thumbwheel Input . . . . . . . . . . . . . 99
Split Exhaust and Return Air Path . . . . . . . 99
Outdoor Airflow Monitoring . . . . . . . . . . . . . 99
Optional Field Enabled Features . . . . . . . . 100
Demand Control CO2 Ventilation . . . . . . . 100
Exhaust Fan Tracking . . . . . . . . . . . . . . . 100
Static Pressure Control for Exhaust Fan . 100
Unoccupied Operation . . . . . . . . . . . . . . . . . .100
Starting Sequence . . . . . . . . . . . . . . . . . . .100
With Return Air Damper Installed . . . . . . .100
No Return Air Damper Installed . . . . . . . . .100
Unoccupied Heating Mode . . . . . . . . . . . . .100
Unoccupied Dehumid Mode . . . . . . . . . . . .100
Unoccupied Cooling Mode . . . . . . . . . . . . .100
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Sensor Source Failures . . . . . . . . . . . . . . .101
Economizer Fault Detection and
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . .102
Start-up Form . . . . . . . . . . . . . . . . . . . . . . . . . . .103
Trane® Horizon™ DOAS . . . . . . . . . . . . . . .103
Pre-Startup Checklist . . . . . . . . . . . . . . . . . .103
Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . .104
Motor Data . . . . . . . . . . . . . . . . . . . . . . . . .105
Compressor Data . . . . . . . . . . . . . . . . . . . .105
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . .105
Refrigeration Start-up . . . . . . . . . . . . . . . . . .106
Test Procedures . . . . . . . . . . . . . . . . . . . . .106
Indirect Fired Gas Heat Start-up . . . . . . . . . .107
Furnace Data . . . . . . . . . . . . . . . . . . . . . . .107
Gas Pressure Settings . . . . . . . . . . . . . . . . .107
Electric Heat Start-up . . . . . . . . . . . . . . . . . .107
Heater Data . . . . . . . . . . . . . . . . . . . . . . . .107
Programming and Commissioning . . . . . . . .108
Program Control Type (MV-13) . . . . . . . . .108
Description . . . . . . . . . . . . . . . . . . . . . . . . .108
Commissioning . . . . . . . . . . . . . . . . . . . . .108
Typical Setpoints . . . . . . . . . . . . . . . . . . . . . .109
Final Notes . . . . . . . . . . . . . . . . . . . . . . . . . . .110

OAU-SVX004G-EN 9
Model Number Descriptions
Horizon Outdoor Air Unit Water Source Heat Pump
Model: OABE, OAGE
Digit 1, 2 — Unit Type
OA = Outdoor Air
Digit 3 — Cabinet Size
B = 500 cfm–3,000 cfm
G = 1,250 cfm–7,500 cfmDigit 4 —
Major Design Sequence
D = Revision 1
E = Heat Pump
F = Indoor WSHP
Digit 5, 6, 7 — Normal Gross
Cooling Capacity (MBh)
000 = No Cooling036=3 Tons High
Efficiency
048 = 4 Tons High Efficiency
108 = 9 Tons High Efficiency
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
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
C = DX 4-Row Interlaced
Digit 12 — Hot Gas Reheat
0 = No HGRH
1 = Fin and Tube Modulating
2 = Fin and Tube On/Off
Digit 13 — Compressor
B = Digital Scroll (1st Circuit Only)
C = Digital Scroll (1st and 2nd Circuit)
Digit 14 — Condenser
3 = Water-Cooled DX Condenser
Copper/Steel
8 = Water-Cooled DX Condenser
Copper/Nickel
Digit 15 — Refrigerant Capacity
Control
0 = No RCC Valve
Digit 16 — Indoor Fan Motor (IFM)
0 = ECM w/Backward Curved
Plenum Fan
4 = Special Motor Option
Digit 17 — Indoor Fan Wheel
A = 355
B = 450
C = 450 X 2
Digit 18 — Indoor Fan Motor Power
(hp)
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-SCR/SEC-ELEC)
J=HotWater
L = No Primary Heat,
Secondary ELEC
N = Dual Fuel
(PRI-ELEC-STAGED/SEC-ELEC)
P = Dual Fuel (PRI-HW/SEC-DF)
Q = Dual Fuel (PRI-HW/
SEC-ELEC-STAGED)R= Dual Fuel
(PRI-STEAM/SEC-DF)
S = Dual Fuel (PRI-STEAM/
SEC-ELEC-STAGED)
T = Dual Fuel (PRI-IF/SEC-ELEC-
SCR)
U = Dual Fuel (PRI-ELEC-SCR/
SEC-ELEC-SCR)
V = No Primary Heat,
Secondary ELEC-SCR
W = Dual Fuel (PRI-ELEC-STAGED/
SEC-ELEC-SCR)
Y = Dual Fuel (PRI-HW/
SEC-ELEC-SCR)
Z = Dual Fuel (PRI-STEAM/
SEC-ELEC-SCR)
X = Special Heat Option
Digit 21 — Primary Fuel Type
0 = No Heat
1=NaturalGas
2 = Propane
3 = Electric—Open Coil
5=HotWater
6 = Steam
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/SCoilCasing
5 = S/S Interior
6 = Eco-Coated Coils
7 = S/S Coil Casing with
Eco-Coated Coils
8 = Copper/Copper Evap,
HGRH Coils
ECM
A=1kW
B=2kW
C= 3kW
IF ELEC HOT WATER
0 = No Heat No Heat No Heat
A = 50 MBh 5 kW 1 Row/10 FPI
B = 75 MBh 10 kW 1 Row/12 FPI
C = 100 MBh 15 kW 1 Row/14 FPI
D = 125 MBh 20 kW 2 Row/10 FPI
E = 150 MBh 24 kW 2 Row/12 FPI
F = 200 MBh 28 kW 2 Row/14 FPI
G = 250 MBh 32 kW 3 Row/10 FPI
H = 300 MBh 40 kW 3 Row/12 FPI
J = 350 MBh 48 kW 3 Row/14 FPI
K = 400 MBh 60 kW
L = 500 MBh 68 kW
M = 600 MBh 79 kW
N = 99 kW
P = 119 kW
X = Special Heater Option
ELEC
0 = No Heat/No Secondary Heat
A=5kW
B = 10 kW
C = 15 kW
D = 20 kW
E = 24 kW
F = 28 kW
G = 32 kW

Model Number Descriptions
10 OAU-SVX004G-EN
Digit 25, 26 — Unit Controls
00 = Non-DDC—Electromechanical
AA = Trane—Discharge Air Control
w/LON Read-Write w/Display
AB = Trane—Space Control w/LON
Read-Write w/Display
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
AI = Trane—Discharge Air Control
w/LON Read-Write (No Display)
AJ = Trane—Space Control
w/LON Read-Write (No Display)
XX = Control Special
Digit 27 — Powered Exhaust Fan
Motor (PFM) and Exhaust Dampers
0 = No Powered Exhaust
5 = Special Motor Option
6 = ECM w/Backward Curved
Plenum Fan
7 = ECM w/Backward Curved
Plenum Fan and Barometric
Relief Damper
8 = ECM w/Backward Curved
Plenum Fan and Isolation
Dampers w/End Switch
9 = Barometric Relief Dampers
(NO PFM)
Digit 28 — Powered Exhaust Fan
Wheel
0 = No Powered Exhaust
A = 355
B = 450
C = 450 X 2
Digit 29 — Powered Exhaust Fan
Motor Power
Digit 30 — Reserved for Future Use
Digit 31 — ERV (Requires Powered
Exhaust)
0=NoERV
A = ERV-Composite Construction
w/Bypass
B = ERV—Composite Construction
with Frost Protection w/VFD
C = ERV—Aluminum Construction
w/Bypass
D = ERV—Aluminum Construction
with Frost Protection w/VFD
Digit 32 — ERV Size
0=NoERV
1 = 3014
2 = 3622
3 = 4136
4 = 4634
5 = 5856
Digit 33 — Damper Options
0 = 100% OA 2-Position Damper
1 = 100% OA 2-Position Damper
w/RA 2-Position Damper
2 = Modulating OA and RA Dampers
w/Economizer
Digit 34 — Filtration Options
A=NoFilters
B = MERV-8,30%
C = MERV-13, 80%
D = MERV-14, 95%
E = MERV-8 30%, MERV-13 80%
F = MERV-8 30%, MERV-14 95%
G = MERV-8, 30% with UVC
H = MERV-13, 80% with UVC
J = MERV-14, 95% with UVC
K = MERV-8 30%, MERV-13 80%,
and UVC
L = MERV-8 30%, MERV-14 95%,
and UVC
X = Special Filter Options
Digit 35 — Smoke Detector (Factory-
Installed)
0 = No Smoke Detector
1 = Supply Smoke Detector
2 = Return Smoke Detector
3 = Supply and Return Smoke
Detectors
Digit 36 — Electrical Options
0 = Terminal Block
A = Non-Fused Disconnect Switch
B = Fused Disconnect Switch
C = Non-Fused Disconnect Switch
w/Convenience Outlet
D = Fused Disconnect Switch
w/Convenience Outlet
E = Dual Point Power
F = Dual Point Power
w/Convenience Outlet
G = 65 SCCR Electrical Rating
w/Non-Fused Disconnect
H = 65 SCCR Electrical Rating
w/Fused Disconnect
J = 65 KAIC Electrical Rating
w/Non-Fused Disconnect
K = 65 KAIC Electrical Rating
w/Fused Disconnect
L = 65 KAIC Non-Fused
w/Convenience Outlet
M = 65 KAIC Fused
w/Convenience Outlet
N = 65 SCCR Non-Fused
w/Convenience Outlet
Digit 37 — Air Flow Monitoring
0 = No Airflow Monitoring
1 = Airflow Monitoring—IFM
Piezo Ring
2 = Airflow Monitoring—PE
Piezo Ring
3 = Airflow Monitoring—Outdoor Air
with Display and IFM
w/Piezo Ring
4 = Airflow Monitoring—IFM
Piezo Ring and PE Piezo Ring
5 = Airflow Monitoring—Outdoor Air
Monitoring w/Display Supply Air
and Exhaust Air w/Piezo Rings
6 = Airflow Monitoring—Outdoor Air
Monitoring for Direct-Fired
Heat Units
Digit 38 — Accessories
0 = No Options
C = LED Service Light in Supply
Fan Section
F = LED Service Light in Exhaust
Fan Section
G = LED Service Light in Supply and
Exhaust Fan Section
Digit 39 — Altitude
0 = Sea Level to 1,000 Feet
1 = 1,001 to 2,000 Feet
2 = 2,001 to 3,000 Feet
3 = 3,001 to 4,000 Feet
4 = 4,001 to 5,000 Feet
5 = 5,001 to 6,000 Feet
6 = 6,001 to 7,000 Feet
7 = Above 7,000 Feet
ECM
0 = No Powered Exhaust
A=1kW
B=2kW
C= 3kW
D= 4kW
E=
F=

Model Number Descriptions
OAU-SVX004G-EN 11
Models: OADE, OAKE, OANE
Digit 1, 2 — Unit Type
OA = Outdoor Air
Digit 3 — Cabinet Size
D = 625 cfm–4,000 cfm
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
060 = 5 Tons High Efficiency
072 = 6 Tons High Efficiency
084 = 7 Tons High Efficiency
096 = 8 Tons High Efficiency
120 = 10 Tons High Efficiency
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
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
C = DX 4-Row Interlaced
Digit 12 — Hot Gas Reheat
0 = No HGRH
1 = Fin and Tube Modulating
2 = Fin and Tube On/Off
Digit 13 — Compressor
B = Digital Scroll—1st Circuit Only
C = Digital Scroll—1st and 2nd Circuit
Digit 14 — Condenser
3 = Water-Cooled DX Condenser
Copper/Steel
8 = Water-Cooled DX Condenser
Copper/Nickel
Digit 15 — Refrigerant Capacity
Control
0 = No RCC Valve
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 HP
A = 1/2 hp—1800 rpm
B = 1/2 hp—3600 rpm
C = 3/4 hp—1800 rpm
D = 3/4 hp—3600 rpm
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—Staged
D = Electric—SCR Modulating
G = Dual Fuel (PRI-IF/SEC-ELEC)
H = Dual Fuel
(PRI-ELEC/-SCRSEC-ELEC)
J = Hot Water
K=Steam
L = No Primary Heat,
Secondary ELEC
N = Dual Fuel
(PRI-ELEC-STAGED/SEC-ELEC)
P = Dual Fuel (PRI-HW/SEC-DF)
Q = Dual Fuel (PRI-HW/SEC-ELEC-
STAGED)
R = Dual Fuel (PRI-STEAM/SEC-DF)
S = Dual Fuel (PRI-STEAM/SEC-
ELEC-STAGED)
T = Dual Fuel (PRI-IF/SEC-ELEC-
SCR)
U = Dual Fuel (PRI-ELEC-SCR/SEC-
ELEC-SCR)
V = No Primary Heat, Secondary
ELEC-SCR
W = Dual Fuel (PRI-ELEC-STAGED/
SEC-ELEC-SCR)
Y = Dual Fuel (PRI-HW/SEC-ELEC-
SCR)
Z = Dual Fuel (PRI-STEAM/SEC-
ELEC-SCR)
X = Special Heat Option
Digit 21 — Primary Fuel Type
0 = No Heat
1=NaturalGas
2 = Propane
3 = Electric—Open Coil
5 = Hot Water
6=Steam

Model Number Descriptions
12 OAU-SVX004G-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
6 = Eco-Coated Coils
7 = S/S Coil Casing with
Eco-Coated Coils
8 = Copper/Copper Evap,
HGRH Coils
Digit 25, 26 — Unit Controls
00 = Non DDC—Electromechanical
AA = Trane—Discharge Air Control
w/LON Read-Write w/Display
AB = Trane—Space Control
w/LON Read-Write w/Display
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
AI = Trane—Discharge Air Control
w/LON Read-Write (No Display)
AJ = Trane—Space Control
w/LON Read-Write (No 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
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 (hp)
0 = No Powered Exhaust
A = 1/2 hp—1800 rpm
B = 1/2 hp—3600 rpm
C = 3/4 hp—1800 rpm
D = 3/4 hp—3600 rpm
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 — Reserved for Future Use
Digit 31 — ERV (Requires Powered
Exhaust)
0=NoERV
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
G = ERV—Aluminum Construction
with Bypass
H = ERV—Aluminum Construction
with Frost Protection and Bypass
Digit 32 — ERV Size
0=NoERV
1 = 3014
2 = 3622
3 = 4136
4 = 4634
5 = 5856
6 = 6488
7 = 6876
8 = 74122
Digit 33 — Damper Options
0 = 100% OA 2-Position Damper
1 = 100% OA 2-Position Damper
w/RA 2-Position Damper
2 = Modulating OA and RA Dampers
w/Economizer
Digit 34 — Filtration Options
A = Aluminum Mesh Intake Filters
(ALM)
B = MERV-8,30%, and ALM
C = MERV-13, 80%, and ALM
D = MERV-14, 95%, and ALM
E = MERV-8 30%, MERV-13 80%, and
ALM
F = MERV-8 30%, MERV-14 95%, and
ALM
G = MERV-8, 30%, and ALM, with
UVC
H = MERV-13, 80%, and ALM, with
UVC
J = MERV-14, 95%, and ALM, with
UVC
K = MERV-8 30%, MERV-13 80%,
ALM, and UVC
L = MERV-8 30%, MERV-14 95%,
ALM, and UVC
X = Special Filter Options
Digit 35 — Smoke Detector—
Factory Installed
0 = No Smoke Detector
1 = Supply Smoke Detector
2 = Return Smoke Detector
3 = Supply and Return Smoke
Detector
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
ELEC
0 = No Heat/No Secondary Heat
A = 10 kW
B = 20 kW
C = 24 kW
D = 28 kW
E = 32 kW
F = 40 kW

Model Number Descriptions
OAU-SVX004G-EN 13
Digit 36 — Electrical Options
0 = Non-Fused Disconnect
A = Fused Disconnect Switch
B = Non-Fused Disconnect
w/Convenience Outlet
C = Fused Disconnect Switch
w/Convenience Outlet
D = Dual Point Power
E = Dual Point Power
w/Convenience Outlet
F = 65 SCCR Electrical Rating
w/Non-Fused Disconnect
G = 65 SCCR Electrical Rating
w/Fused Disconnect
H = 65 KAIC Electrical Rating
w/Non-Fused Disconnect
J = 65 KAIC Electrical Rating
w/Fused Disconnect
L = 65 KAIC Fused
w/Convenience Outlet
M = 65 SCCR Non-Fused
w/Convenience Outlet
Digit 37 — Air Flow Monitoring
0 = No Airflow Monitoring
1 = Airflow Monitoring—IFM
Piezo Ring
2 = Airflow Monitoring—PE
Piezo Ring
3 = Airflow Monitoring—Outdoor Air
with Display and IFM
w/Piezo Ring
4 = Airflow Monitoring—IFM
Piezo Ring and PE Piezo Ring
5 = Airflow Monitoring—Outdoor Air
Monitoring w/ Display Supply
Air and Exhaust Air
w/Piezo Rings
6 = Airflow Monitoring—Outdoor Air
Monitoring for Direct Fired Heat
Units
Digit 38 — Accessories
0 = No Options
B = LED Service Light in Supply
Fan Section
D = LED Service Light in Exhaust
Fan Section
E = LED Service Light in Supply and
Exhaust Fan Section
Digit 39 — Altitude
0 = Sea Level to 1,000 feet
1 = 1,001 to 2,000 feet
2 = 2,001 to 3,000 feet
3 = 3,001 to 4,000 feet
4 = 4,001 to 5,000 feet
5 = 5,001 to 6,000 feet
6 = 6,001 to 7,000 feet
7 = Above 7,000 feet

14 OAU-SVX004G-EN
General Information
Overview of Manual
Note: One copy of this document ships inside the control
panel of each unit and is customer property. It must be
retained by the unit’s maintenance personnel.
This booklet describes proper installation, operation, and
maintenance procedures for air cooled systems. By carefully
reviewing the information within this manual and following the
instructions, the risk of improper operation and/or component
damage will be minimized.
It is important that periodic maintenance be performed to help
assure trouble free operation. A maintenance schedule is
provided at the end of this manual. Should equipment failure
occur, contact a qualified service organization with qualified,
experienced HVAC technicians to properly diagnose and
repair this equipment.
Model Number Description
All products are identified by a multiple-character model
number that precisely identifies a particular type of unit. An
explanation of the alphanumeric identification code is provided
(see Model Number chapter). Its use will enable the owner/
operator, installing contractors, and service engineers to
define the operation, specific components, and other options
for any specific unit.
When ordering replacement parts or requesting service, be
sure to refer to the specific model number and serial number
printed on the unit nameplate.
Unit Nameplate
A Mylar®unit nameplate is located on the unit’s corner support
next to the control box. It includes the unit model number, serial
number, electrical characteristics, refrigerant charge, as well
as other pertinent unit data.
Compressor Nameplate
The nameplate for the compressors are located on the side of
the compressor.
Unit Description
Before shipment, each unit is leak tested, dehydrated, charged
with refrigerant and compressor oil, and run tested for proper
control operation.
The Outdoor Air Unit Main Unit Display and ReliaTel™ Control
Module (RTRM) are microelectronic control systems. The
acronym RTRM is extensively throughout this document when
referring to the control system network.
The Main Unit Display and the RTRM are mounted in the Main
Control Panel. The Main Unit Display and RTRM receive
information from sensors and customer binary contacts to
satisfy the applicable request for ventilation, cooling,
dehumidification and heating.
Indoor Fan Failure Input
The Indoor Fan Failure Switch (IFFS) is connected to verify
indoor fan operation.
When there is a call for the indoor fan to be energized, the
differential pressure switch, connected to the Main Unit
Display, must prove airflow within 30 seconds or the Main Unit
Display will shut off all mechanical operations, lock the system
out and send a diagnostic alarm to the Unit Display. The
system will remain locked out until a reset is initiated through
the MCM via the Alarm Reset Function on the Unit Display.
Low Pressure Control ReliaTel Control
This input incorporates the compressor low pressure control
(CLP 1/2) of each refrigeration circuit and can be activated by
opening a field supplied contact installed on the OAUTS.
If this circuit is open before the compressor is started, the
ReliaTel™ control will not allow the affected compressor to
operate. Anytime this circuit is opened for 1 continuous second
during compressor operation, the compressor for that circuit is
immediately turned “Off.” The compressor will not be allowed
to restart for a minimum of 3 minutes should the contacts close.
If four consecutive open conditions occur during the first three
minutes of operation, the compressor for that circuit will be
locked out, and a manual reset will be required to restart the
compressor.
Refrigerant Circuits
For OAB units (3 to 9 ton) and OAD units (5–7 tons), one
refrigerant circuit shall incorporate a standard 4- -row coil. For
OAD, OAG, OAK, and OAN units (8–54 tons), two independent
refrigerant circuits shall incorporate an interlaced 4-row coil. All
circuits shall have thermal expansion valves (TXVs), service
pressure ports, and refrigerant line filter driers, suction line
accumulators, and revering valve as standard. An area will be
provided for replacement liquid line driers. The first refrigerant
circuit is equipped with a digital scroll.
High Pressure Control ReliaTel Control
The compressor high pressure controls (CHP 1/2/3/4) are
wired in series between the compressor outputs on RTRM1
(CHP 1/2) and RTRM2 (CHP 3/4) and the compressor
contactor coils. If one of the high pressure control switches
opens, the respective RTRM senses a lack of current while
calling for cooling and locks the compressor out.
On dual circuit units, if the high pressure control opens, the
compressor on the affected circuit is locked out. A manual
reset for the affected circuit is required.
Space Temperature / RH Sensor (Optional)
Field installed, wall mounted temperature sensor
(BAYSENS036A) and humidity to control space cooling,
heating and dew point.

General Information
OAU-SVX004G-EN 15
High Temperature Sensor
The Discharge Air Temperature Sensor (DTC) supplies a
continuous signal to the MCM. Factory setting for Discharge
Air Temperature (DTC) Discharge Air Temperature Setpoint
Maximum (MDTS) is 120°F, the unit will be shut down, and
require a manual restart if Discharge Air Temperature exceeds
MDTS for 10 minutes (adj 10–25 minutes). If DAT exceeds
Discharge Air High Temperature Cutoff (DHCS) of 125°F for
10 minutes for gas heat or 90°F for electric heat, the unit will
shut down and require manual restart.
Outdoor Air Temperature and Relative
Humidity Sensor
This factory installed combination outdoor air sensor located in
the outdoor air hood is designed to sense both outdoor air
temperature and relative humidity for use by the
microprocessor controller to make required ventilation,
cooling, dehumidification and heating decisions. Control Input
(Occupied / Unoccupied)
Terminals are provided on the terminal strip labeled OAUTS for
a field installed dry contact or switch closure to put the unit in
the Occupied or Unoccupied modes.
Hot Gas Reheat
This option shall consist of a hot-gas reheat coil located on the
leaving air side of the evaporator.
100 Percent Outdoor Air Hood with
Damper and Filters
Factory-installed and -integrated 100 percent outdoor air hood
with damper controlled by a direct coupled actuator and 2 in.
(50.80 mm) permanent and washable aluminum mesh filters
(mist eliminators) removable through a hinged access panel.
The unit is factory equipped with provisions to accept an
optional field installed100 percent return air damper controlled
by a direct coupled actuator that is electrically interlocked with
the outdoor air damper.
Modulating Indirect Gas-Fired Burner
The unit will have fully modulating, high turndown, indirect gas-
fired heat. The heating section will include high turn-down
burners and a stainless steel tubular heat exchanger. The heat
exchanger will be constructed of type 439 stainless steel and
be a tubular design capable of draining internal condensate.
External flue to be constructed of type 304 stainless steel.
Units will be suitable for use with natural gas or Liquid Propane
(LP) gas.
Through the Base Electrical with
Disconnect Switch
Factory installed 3-pole, molded case disconnect switch with
provisions for through the base electrical connections will be
included. The disconnect switch, with integral overcurrent
circuit breaker, will be installed in the unit in a water tight
enclosure with access through a hinged door. Factory wiring
will be provided from the switch to the unit high voltage terminal
block. The switch will be UL/CSA agency recognized.
Through the Base Gas Piping
The unit will include provisions for installing through the base
gas piping. The factory installed option will have all piping
necessary including an external shutoff piping yoke with pre-
assembled, manual gas shut-off valve, elbows, and union. The
manual shut-off valve will include an 1/8 in. (3.17 mm) NPT
pressure tap. This assembly will require minor field labor to
install.
Hinged Access Doors
Hinged access doors with hold open brackets will be factory-
installed.
Electric Heat
The unit may have fully modulating, SCR electric heat. The
primary heating section will include open coil heating
elements, automatic and manual cut-outs, low voltage
controls, air proving switch, maximum 48 amps per circuit and
fusing for heaters over 48 amps. For ductwork installation,
refer to “Ductwork,” p. 37.
Supply and Exhaust Piezo Fan Rings
Airflow monitoring measuring fan suction and cone pressure
differential to calculate fan airflow.
ERV
Energy Recovery Wheels rotate between the incoming
outdoor air stream and the building exhaust air stream. As the
wheel rotates, it transfers a percentage of the heat and
moisture differential from one air stream to the other. Instead
of wasting energy in the exhaust airstream, it is temporarily
captured by the energy transfer media and then released to
preheat, pre-cool, humidify, or dehumdify the incoming air.
Hot Water Coils
This option consist of a hot water coil located in the primary
heat position. Hot water valve is field provided.
Suction Pressure Monitoring
All units with compressors will come standard with a
refrigeration suction pressure transducer on Circuit 1, and on
Circuit 2 when the unit has a digital scroll on the second circuit.
Head Pressure Control
Condenser fans to be controlled via VFD to maintain
adjustable pressure to increase reheat capacity where
applicable and low ambient control.

General Information
16 OAU-SVX004G-EN
Unit Inspection
As soon as the unit arrives at the job site:
• Avoid breathing fiberglass dust.
• Use a NIOSH approved dust/mist respirator.
• Avoid contact with the skin or eyes. Wear long-sleeved,
loose-fitting clothing, gloves, and eye protection.
• Wash clothes separately from other clothing: rinse washer
thoroughly.
• Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respiration in these situations.
First Aid Measures
Eye Contact
Flush eyes with water to remove dust. If symptoms persist,
seek medical attention.
Skin Contact
Wash affected areas gently with soap and warm water after
handling.
Storage
Take precautions to prevent condensate from forming inside
the unit’s electrical compartments and motors if:
• the unit is stored before it is installed; or,
• the unit is set on the roof curb, and temporary heat is
provided in the building. Isolate all side panel service
entrances and base pan openings (e.g., conduit holes, S/
A and R/A openings, and flue openings) from the ambient
air until the unit is ready for startup.
Note: Do not use the unit’s heater for temporary heat without
first completing the startup procedure detailed in “Start-
Up,” p. 67.
The manufacturer will not assume any responsibility for
equipment damage resulting from condensate accumulation
on the unit’s electrical and/or mechanical components.
Unit Clearances
“Unit Clearances, Curb Dimensions, and Dimensional Data,”
p. 17 contains figures that illustrate the minimum operating
and service clearances for either a single or multiple unit
installation. These clearances are the minimum distances
necessary to assure adequate serviceability, cataloged unit
capacity, and peak operating efficiency.
Providing less than the recommended clearances may result
in “short-circuiting” of exhaust.
WARNING
Fiberglass Wool!
Product may contain fiberglass wool. Disturbing the
insulation in this product during installation,
maintenance or repair will expose you to airborne
particles of glass wool fibers and ceramic fibers known
to the state of California to cause cancer through
inhalation. Glass wool fibers may also cause
respiratory, skin or eye irritation.
AVERTISSEMENT
Laine de verre !
Le produit peut contenir de la laine de verre. Des
interventions inappropriées sur l’isolation de ce produit
pendant les opérations d’installation, d’entretien ou de
réparation vous exposent à des particules aériennes de
fibres de verre ou de fibres céramiques, responsables
selon la législation américaine (état de Californie) de
risques de cancers par inhalation. Les fibres de verre
peuvent aussi provoquer des phénomènes d’irritation
au niveau du système respiratoire, de la peau ou des
yeux.
Verify that the nameplate data matches the data on the
sales order and bill of lading (including electrical data).
Verify that the power supply complies with the unit
nameplate specifications.
Visually inspect the exterior of the unit, including the roof,
for signs of shipping damage.
Visually inspect the internal components for shipping
damage as soon as possible after delivery and before it
is stored. Do not walk on the sheet metal base pans.
If concealed damage is discovered, notify the carrier’s
terminal of damage immediately by phone and by mail.
Concealed damage must be reported within 15 days.
Request an immediate joint inspection of the damage by
the carrier and the consignee. Do not remove damaged
material from the receiving location. Take photos of the
damage, if possible. The owner must provide reasonable
evidence that the damage did not occur after delivery.
Notify the appropriate sales representative before
installing or repairing a damaged unit.

OAU-SVX004G-EN 17
Unit Clearances, Curb Dimensions, and Dimensional
Data
Outdoor WSHP Units
OABE Units
Unit Clearances
Note: Certain options require auxiliary cabinet. Refer to
project-specific unit submittals.
WARNING
Combustible Materials!
Failure to maintain proper clearance between the unit
heat exchanger, vent surfaces and combustible
materials could cause a fire which could result in death
or serious injury or property damage. Refer to unit
nameplate and installation instructions for proper
clearances.
AVERTISSEMENT
Matériaux combustibles !
Tout manquement à l’obligation de maintenir une
distance appropriée entre l’échangeur de chaleur de
l’unité, les surfaces de ventilation et les matériaux
combustibles peut provoquer un incendie pouvant
résulter en des blessures corporelles graves, voire
mortelles, ou des dommages matériels. Reportez-vous
à la plaque signalétique de l’unité et aux instructions
d’installation pour connaître les distances appropriées.
Figure 1. Typical installation clearances for OABE unit
7'-0"
9'-6 13
16 "
END TO END
6'-0"
Figure 2. Typical installation clearances for OABE unit
with auxiliary cabinet
Figure 1. Typical installation clearances for OABE unit
3'-0"
4'-0"
4'-0"
3'-0"
7'-0" 6'-0"
3'-0"
4'-0"
3'-0"
3'-0"

Unit Clearances, Curb Dimensions, and Dimensional Data
18 OAU-SVX004G-EN
Curb Dimensions
Note: Certain options require auxiliary cabinet. Refer to
project-specific unit submittals.
Dimensional Data
Figure 3. Unit curb data for OABE 3 to 9 tons
Figure 4. Unit curb data for OABE 3 to 9 tons with
auxiliary cabinet
3"2 8
3 1
2"
GUTTER B DETAIL
"
5
27 8
3
4
42"
14
8
8
3
10 "
"
2
48 1
1
11
8
4"
"
2
93 1
1
25 "
8
39
3
2 "
"
3"
4
13 8
"
5
1
46 "
"10 3
8
12 7
8"
GUTTER B
DETAIL A - GUTTER
SCALE 1 : 14
3 3/4"3 1/2"
93 1/2"
48 1/2"
46 1/8"
12 7/8"
13 5/8"
25 1/8"
42"
14 3/4"
11 1/4"
27 5/8"
10 1/2"
10 1/2" 38 1/2"
38 3/4"
135 3/4"
DETAIL B - PIPE CHASE GUTTER
SCALE 1 : 12
2 3/8"
3 1/2"
Figure 5. Unit dimensional data for OABE 3 to 9 tons
(in.)
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Unit Clearances, Curb Dimensions, and Dimensional Data
OAU-SVX004G-EN 19
Note: Certain options require auxiliary cabinet. Refer to
project-specific unit submittals.
Indirect-Fired OAGE Units
Unit Clearances
Figure 6. Unit dimensional data for OABE 3 to 9 tons
with auxiliary cabinet (in.)
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Figure 8. Typical installation clearances for indirect-
fired OAGE unit (in.)
72
84
36
36
48
48

Unit Clearances, Curb Dimensions, and Dimensional Data
20 OAU-SVX004G-EN
Note: Certain options require auxiliary cabinet. Refer to
project-specific unit submittals.
Curb Dimensions
Note: Certain options require auxiliary cabinet. Refer to
project-specific unit submittals.
Figure 9. Typical installation clearances for indirect-
fired OAGE unit with auxiliary cabinet (in.)
72
84
72
48
36
48
36
Figure 10. Unit curb data for indirect-fired OAGE (in.)
Figure 11. Unit curb data for indirect-fired OAGE with
auxiliary cabinet (in.)
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