How it Works
Trane
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OA B D 036
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Trane OA B D 000, OA G D 000, OA B E 000, OA G E 000, OA B D 036 Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance
Horizon™ Outdoor Air Unit
Direct Gas-Fired Model: OAB, OAG
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.
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
November 2019
OAU-SVX005C-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.
The three types of advisories are defined as follows:
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 electrical codes.
WARNING
CAUTIONs
NOTICE:
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
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.
Indicates a situation that could result in equipment or property-damage only accidents.
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 handli ng of all refrigerants-including industry replacements for CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs.
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.
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 Air Act (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.
© 2019 Ingersoll Rand OAU-SVX005C-EN
Introduction
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 Material Safety Data Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA guidelines for proper PPE.
• When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS/SDS and OSHA/GHS (Global Harmonized System of Classification and Labelling 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.
OAU-SVX005C-EN 3
Introduction
WARNING
Follow EHS Policies!
Failure to follow instructions below could result in death or serious injury.
• All Ingersoll Rand personnel must follow Ingersoll Rand Environmental, Health and Safety (EHS) policies when performing work such as hot work, electrical, fall protection, lockout/tagout, refrigerant handling, etc. All policies can be found on the BOS
site. Where local regulations are more stringent than
these policies, those regulations supersede these policies.
• Non-Ingersoll Rand personnel should always follow local regulations.
AVERTISSEMENT
Respecter les politiques EHS!
Le non-respect des consignes suivantes peut être à l’origine de blessures graves, voire mortelles.
• Tous les membres du personnel du groupe Ingersoll Rand sont tenus de respecter les règles établies par Ingersoll Rand 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, de procédures de verrouillage/mise hors service, de manipulation de fluide frigorigène, etc. Toutes les politiques sont disponibles sur le site BOS. Si les réglementations locales sont plus strictes que les règles imposées par le groupe, elles deviennent prioritaires.
• Le personnel extérieur au groupe Ingersoll Rand est, quant à lui, systématiquement tenu d’observer les réglementations en vigueur à l’échelle locale.
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 non­approved refrigerants, refrigerant substitutes, or refrigerant additives.
AVERTISSEMENT
Fluide frigorigène sous haute pression!
Tout manquement aux instructions indiquées ci­dessous 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.
4 OAU-SVX005C-EN
Introduction
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 ci­dessous 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.
AVERTISSEMENT
Risque d’explosion et gaz mortels!
Le non-respect de toutes les consignes de sécurité ci­dessous 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.
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.
Revision History
Added French language translations of warnings.
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.
OAU-SVX005C-EN 5
Table of Contents
Model Number Descriptions . . . . . . . . . . . . . . 8
Horizon Outdoor Air Unit . . . . . . . . . . . . . . . 8
General Information . . . . . . . . . . . . . . . . . . . . 11
Overview of Manual . . . . . . . . . . . . . . . . . 11
Model Number Description . . . . . . . . . . . 11
Unit Nameplate . . . . . . . . . . . . . . . . . . . . 11
Compressor Nameplate . . . . . . . . . . . . . . 11
Unit Description . . . . . . . . . . . . . . . . . . . . 11
Indoor Fan Failure Input . . . . . . . . . . . . . 11
Low Pressure Control ReliaTel Control . 11
Refrigerant Circuits . . . . . . . . . . . . . . . . . 11
High Pressure Control ReliaTel Control . 11
Space Temperature / RH Sensor (Optional) 12
High Temperature Sensor . . . . . . . . . . . . 12
Outdoor Air Temperature and Relative Hu-
midity Sensor . . . . . . . . . . . . . . . . . . . . . . 12
Control Input (Occupied / Unoccupied) . 12
Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . 12
100 Percent Outdoor Air Hood with Damper
and Filters . . . . . . . . . . . . . . . . . . . . . . . . . 12
Through the Base Electrical with Disconnect
Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hinged Access Doors . . . . . . . . . . . . . . . . 12
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . 12
First Aid Measures . . . . . . . . . . . . . . . . . . 13
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Unit Clearances . . . . . . . . . . . . . . . . . . . . 13
Filter Installation . . . . . . . . . . . . . . . . . . . . .19
Field Installed Power Wiring . . . . . . . . . . .20
Main Unit Power . . . . . . . . . . . . . . . . . . . . . .21
Standard Wiring . . . . . . . . . . . . . . . . . . . . .21
Voltage Imbalance . . . . . . . . . . . . . . . . . . .21
Electrical Phasing (Three-Phase Motors) .22
Compressor Crankcase Heaters . . . . . . . .23
Main Unit Display and ReliaTel Controls .23
Field-Installed Control Wiring . . . . . . . . . .23
Control Power Transformer . . . . . . . . . . .23
Controls Using 24 Vac . . . . . . . . . . . . . . . . 24
Controls Using DC Analog Input/Output (Standard Low Voltage Multiconductor Wire) 24
DC Conductors . . . . . . . . . . . . . . . . . . . . . . . .25
System Configuration and Pre-Start . . . . . . .26
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Direct Heating Startup . . . . . . . . . . . . . . . . .29
Direct Gas-Fired Heating Start-Up Procedure
30
Initiate . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Standby . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Normal Start-up Pre-purge . . . . . . . . . . . .33
Ignition Trials . . . . . . . . . . . . . . . . . . . . . . .33
Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Settings and Adjustments . . . . . . . . . . . . .34
Operation of the Direct Spark Ignition Control
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . .34
Unit Clearances, Curb Dimensions, and Dimen­sional Data
Direct-Fired OAB Units . . . . . . . . . . . . . . . 14
Direct-Fired OAG Units . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Unit Weight and Rigging . . . . . . . . . . . . . . . . 16
Unit Weight . . . . . . . . . . . . . . . . . . . . . . . . 16
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . 18
General Unit Requirements . . . . . . . . . . . 18
Main Electrical Power Requirements . . . 19
Condensate Drain Configuration . . . . . . 19
6 OAU-SVX005C-EN
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Monthly Maintenance . . . . . . . . . . . . . . . . . .36
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Supply/Return Air Smoke Detector Mainte-
nance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cooling Season . . . . . . . . . . . . . . . . . . . . .36
Heating Season . . . . . . . . . . . . . . . . . . . . .36
Condenser Coil Cleaning . . . . . . . . . . . . . .36
Direct-Fired Unit Maintenance Schedule . .38
Lubrication Requirements . . . . . . . . . . . . .39
Pillow Block Bearings . . . . . . . . . . . . . . . . 40
Frequency of Lubrication . . . . . . . . . . . . . .40
Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Belt Tensions and Adjustments . . . . . . . 41
Suggested Belt Tension Method . . . . . . . 41
Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Annual Maintenance . . . . . . . . . . . . . . . . 41
Heater Maintenance . . . . . . . . . . . . . . . . . 41
Inspection and Maintenance of Gas Ports 43
Final Process . . . . . . . . . . . . . . . . . . . . . . . . . 43
Performance Data . . . . . . . . . . . . . . . . . . . . . . 45
Superheat and Refrigeration Circuit Data 49
Alarms and Troubleshooting . . . . . . . . . . . . 51
Microprocessor Control . . . . . . . . . . . . . . 51
System Alarms . . . . . . . . . . . . . . . . . . . . . 51
Sensor Failure Alarm Display . . . . . . . . . 51
RTRM Failure Modes . . . . . . . . . . . . . . . . 53
Airflow Troubleshooting . . . . . . . . . . . . . 53
Direct-Fired OAB and OAG Unit Flame Relays
£ 400 MBh . . . . . . . . . . . . . . . . . . . . . . . . . 54
Direct-Fired OAG Unit Flame Relays >
400 MBh . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table of Contents
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
OAU Filter Guide . . . . . . . . . . . . . . . . . . . . . 59
OAU-SVX005C-EN 7

Model Number Descriptions

Horizon Outdoor Air Unit

Digit 1, 2 — Unit Type
OA = Outdoor Air
Digit 3 — Cabinet Size
B = 500 cfm–3,000 cfm G = 1,250 cfm–7,500 cfm
Digit 4 — Major Design Sequence
D = Revision 1 E = Heat Pump
Digit 5, 6, 7 — Normal Gross Cooling Capacity (MBh)
000 = No Cooling 036 = 3 Tons High Efficiency 048 = 4 Tons High Efficiency 060 = 5 Tons High Efficiency 072 = 6 Tons High Efficiency 084 = 7 Tons High Efficiency 096 = 8 Tons High Efficiency 108 = 9 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
Digit 8 — Minor Design Sequence
A = Vertical Discharge/Vertical Return B = Vertical Discharge/
C = Horizontal Discharge/
D = Horizontal Discharge/
Horizontal Return
Vertical Return
Horizontal Return
Digit 9 — Voltage Selection
1 = 115/60/1 2 = 208-230/60/1 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 A = DX 3-Row B = DX 4-Row C = DX 4-Row Interlaced D = DX 6-Row Interlaced E = DX 8-Row F = Glycol/Chilled Water Coil G = DX 4-Row with
MSP
®
Technology
Digit 12 — Hot Gas Reheat
0= No HGRH 1 = Fin and Tube Modulating 2 = Fin and Tube On/Off 3 = Microchannel Modulating 4 = Microchannel On/Off
Digit 13 — Compressor
0= No Compressors A = Scroll Compressors B = Digital Scroll (1 C = Digital Scroll (1 D = Variable Speed Scroll (1
E = Variable Speed Scroll (1
Circuit Only)
nd
Circuit)
2
st
Circuit Only)
st
and 2nd Circuit)
st
st
and
Digit 14 — Condenser
0 = No Condenser 1 = Air-Cooled Fin and Tube 2 = Air-Cooled Fin and Tube
3 = Water-Cooled DX Condenser
4 = Air-Cooled Fin and Tube
5 = Air-Cooled Microchannel 6 = Air-Cooled Microchannel
7 = Air-Cooled Microchannel
8 = Water-Cooled DX Condenser
w/Head Pressure On/Off Control
Copper/Steel
w/Head Pressure Variable Speed
w/Head Pressure On/Off Control
Variable Speed
Copper/Nickel
Digit 15 — Refrigerant Capacity Control
0 = No RCC Valve A = RCC Valve on 1 B = RCC Valve on 1 C = ERCC Valve on 1 D = ERCC Valve on 1 E = HGBP Valve on 1 F = HGBP Valve on 1
nd
2
Circuit
st
Circuit
st
and 2nd Circuit
st
Circuit
st
and 2nd Circuit
st
Circuit
st
and
Digit 16 — Indoor Fan Motor (IFM)
0 = ECM w/Backward Curved
1 = Direct Drive w/ VFD 2 = Belt Drive 3 = Belt Drive w/VFD 4 = Special Motor Option
Plenum Fan
Digit 17 — Indoor Fan Wheel
A = 355 B = 450 C = 450 X 2 D = 12/9 T2 (Single Fan—Belt Drive) E = 12/9 BT (Dual Fan—Belt Drive)
Digit 18 — Indoor Fan Motor Power (hp)
ECM Belt Drive
A = 1 kW 2 hp B = 2 kW 3 hp C = 3 kW 5 hp D = 4 kW 7.5 hp E = 10 hp F = 15 hp
Digit 19 — Reserved for Future Use
Digit 20 — Heat Type (PRI/SEC)
0 = No Heat A = Indirect-Fired (IF) B = No Primary Heat, Direct-Fired
(DF) Secondary C = Electric—Stage D = Electric—SCR Modulating E = Dual Fuel (PRI-IF/SEC-DF) F = Dual Fuel (PRI-ELEC/SEC-DF) G = Dual Fuel (PRI-IF/SEC-ELEC) H = Dual Fuel
(PRI-ELEC-SCR/SEC-ELEC) J = Hot Water K = Steam L = No Primary Heat,
Secondary ELEC M = Dual Fuel
(PRI-ELEC-STAGED/SEC-DF) 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 4 = Electric—Sheathed Coil 5 = Hot Water 6 = Steam
8 OAU-SVX005C-EN
Model Number Descriptions
Digit 22 — Heat Capacity (Primary Heat Source)
IF ELEC
0 = No Heat No Heat A = 50 MBh 5 kW B = 75 MBh 10 kW C = 100 MBh 15 kW D = 125 MBh 20 kW E = 150 MBh 24 kW F = 200 MBh 28 kW G = 250 MBh 32 kW H = 300 MBh 40 kW J = 350 MBh 48 kW K = 400 MBh 60 kW L = 500 MBh 68 kW M = 600 MBh 79 kW N = 99 kW O = 111 kW P = 119 kW X = Special Heater Option
Digit 23 — Heat Capacity (Secondary Heat Source)
ELEC DF
0 = No Heat/No Secondary Heat A = 5 kW 6-in. Burner—
Up to 300 MBh
B = 10 kW 12-in. Burner—
Up to 400 MBh
C = 15 kW 12-in. Burner—
Up to 600 MBh
D = 20 kW 18-in. Burner—
Up to 400 MBh
E = 24 kW 18-in. Burner—
Up to 900 MBh
F = 28 kW
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
AB = Trane—Space Control w/LON
AC = Trane—Discharge Air Control
AD = Trane—Space Control
AF = Trane—Discharge Air Control
AG = Trane—Space Control
AI = Trane—Discharge Air Control
AJ = Trane—Space Control
AK = Trane—Multi-Zone VAV Control
AL = Trane—Multi-Zone VAV Control
AM = Trane—Multi-Zone VAV Control
AN = Trane—Multi-Zone VAV Control
AO = Trane—Single-Zone VAV Control
AP = Trane—Single-Zone VAV Control
AQ = Trane—Single-Zone VAV Control
AR = Trane—Single-Zone VAV Control
XX = Control Special
w/LON Read-Write w/Display
Read-Write w/Display
®
w/BACnet
w/BACnet (No Display)
w/BACnet w/Display
w/BACnet w/Display
w/LON Read-Write (No Display)
w/LON Read-Write (No Display)
w/LON Read-Write w/Display
w/BACnet w/Display
w/LON Read-Write (No Display)
w/BACnet (No Display)
w/LON Read-Write w/Display
w/BACnet w/Display
w/LON Read-Write (No Display)
w/BACnet (No Display)
(No Display)
Digit 27 — Powered Exhaust Fan Motor (PFM) and Exhaust Dampers
0 = No Powered Exhaust 1 = Direct Drive w/VFD 2 = Direct Drive (VFD by Others) 3 = Belt Drive 4 = Belt Drive w/VFD 5 = Special Motor Option 6 = ECM w/Backward Curved
7 = ECM w/Backward Curved
8 = ECM w/Backward Curved
9 = Barometric Relief Dampers
Plenum Fan
Plenum Fan and Barometric Relief Damper
Plenum Fan and Isolation Dampers w/End Switch
(NO PFM)
Digit 28 — Powered Exhaust Fan Wheel
0 = No Powered Exhaust A = 355 B = 450 C = 450 X 2 D = 12/9 T2 (Single Fan—Belt Drive) E = 12/9 BT (Dual Fan—Belt Drive)
Digit 29 — Powered Exhaust Fan Motor Power
ECM Belt Drive
0 = No Powered Exhaust A = 1 kW 2 hp B = 2 kW 3 hp C = 3 kW 5 hp D = 4 kW 7.5 hp E = 10 hp F = 15 hp
Digit 30 — Reserved for Future Use
Digit 31 — ERV (Requires Powered Exhaust)
0= No ERV 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= No ERV 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
OAU-SVX005C-EN 9
Model Number Descriptions
Digit 34 — Filtration Options
A = No Filters 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 M = MERV-8 30% and TCACS N = MERV-13 80% and TCACS P = MERV-14 95% and TCACS Q = MERV-8 30%, MERV-13 80%,
and TCACS R = MERV-8 30%, MERV-14 95%,
and TCACS 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 A = Hailguards B = Hailguards and LED Service
Light in Supply Fan Section
C = LED Service Light in Supply
Fan Section
D = Hailguards and LED Service
Light in Exhaust Fan Section
E = Hailguards and LED Service
Light in Supply and Exhaust 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
10 OAU-SVX005C-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 techn icians 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 the 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.
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 60 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 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 will be locked out, and a manual reset will be required to restart the compressor.

Refrigerant Circuits

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 condenser coils are aluminum fin, mechanically bonded to copper tubing.
Direct-drive, vertical discharge condenser fans are provided with built-in thermal overload protection.
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 optional Main Unit Display and the RTRM are mounted in the Main Control Panel. The Main Unit Display
OAU-SVX005C-EN 11
Units shall incorporate a 4- or 6-row evaporator coil. All circuits shall have thermal expansion valves (TXVs), service pressure ports, sight glass, and refrigerant line filter drier as standard. An area will be provided for replacement suction line driers. Each refrigerant circuit is equipped with a factory installed and preset refrigerant capacity control (RCC) to prevent evaporator coil temperatures below approximately 38°F (114 lb suction). The refrigerant capacity device is not installed when the unit is equipped with a digital scroll.

High Pressure Control ReliaTel Control

The compressor high pressure controls (CHP 1/2) are wired in series between the compressor outputs on RTRM1 (CHP 1/2) and the compressor contactor coils. If one of the high pressure control switches opens, the RTRM senses a lack of current while calling for cooling and locks the compressor out.
General Information

Space Temperature / RH Sensor (Optional)

Field installed, wall mounted temperature sensor (BAYSENS036A) and humidity to control space cooling, heating and dew point.

High Temperature Sensor

The Discharge Air Temperature Sensor (DTC) supplies a continuous signal to the MCM. If the MCM does not sense a signal from the DTC, the unit will go into LOCKOUT and require a manual restart once the proper operation of the DTC has been confirmed. If DAT exceeds Discharge Air High Temperature Cutoff (DHCS) of 125°F for 10 minutes, 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.

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.

Hinged Access Doors

Hinged access doors with hold open brackets will be factory-installed.

Unit Inspection

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.
As soon as the unit arrives at the job site:
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 conce aled 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.
• 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.
12 OAU-SVX005C-EN
• 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 “Startup,” p. 29.
The manufacturer will not assume any responsibility for equipment damage resulting from condensate accumulation on the unit’s electrical and/or mechanical components.
General Information

Unit Clearances

Unit Clearances, Curb Dimensions, and Dimensional Data chapter 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 condenser coil starvation, “short-circuiting” of exhaust or recirculation of hot condenser air.
OAU-SVX005C-EN 13
Unit Clearances, Curb Dimensions, and Dimensional
84
72
36
36
48
36
48.500
25.500
25.000
3.750
93.500
9.250
27.500
9.250
12.750
13.750
1.250
3.438
122.688
RETURN
SUPPLY
55.143
55.489
52.554
52.000
22.000
3.180
15.676
ELECTRIC DISCONNECT
FRONT VIEW
12.979
18.149
144.349
126.200
97.000 29.200
RIGHT SIDE VIEW
3.250
12.000
SUPPLY
24.000 SUPPLY
16.000
26.500
RETURN
12.750
12.750
14.500
RETURN
32.450
22.000
4.498
THROUGH BASE
ELECTRIC
BOTTOM VIEW
Data
Curb Dimensions
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 2. Unit curb data for direct-fired OAB tons (in.)
Dimensional Data
Figure 3. Unit dimensional data for direct-fired OAB
(in.)

Direct-Fired OAB Units

Unit Clearances
Figure 1. Typical installation clearances for direct-fired
OAB unit (in.)
14 OAU-SVX005C-EN
Unit Clearances, Curb Dimensions, and Dimensional Data
72
84
36
36
48
36
70.500
22.625
21.000
8.750
15.000
25.000
RETURN
SUPPLY
53.000
8.750
117.500
23.375
35.375
11.875
121.371
66.096
ELECTRIC
DISCONNECT
SWITCH
THROUGH BASE
ELECTRIC
74.000
17.323
33.751 121
3.078
GAS INLET
5.5852

Direct-Fired OAG Units

Unit Clearances
Figure 4. Typical installation clearances for direct-fired
OAG unit (in.)
Dimensional Data
Figure 6. Unit dimensional data for direct-fired OAG
(in.)
Curb Dimensions
Figure 5. Unit curb data for direct-fired OAG tons (in.)
OAU-SVX005C-EN 15

Unit Weight and Rigging

WARNING
Heavy Objects!
Failure to follow instructions below or properly lift unit could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury, and equipment or property-only damage. Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted. Each of the cables (chains or slings), hooks, and shackles used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as necessary for even unit lift.
AVERTISSEMENT
Objets lourds!
Le non-respect des instructions ci-dessous ou un levage inapproprié de l’unité peut provoquer sa chute voire écraser l’opérateur/le technicien, ce qui peut occasionner des blessures graves voire mortelles, et éventuellement endommager l’équipement ou provoquer des dégâts matériels. Assurez-vous que l’équipement de levage utilisé est adapté au poids de l’unité à soulever. Chaque câble (chaîne ou élingue), crochet ou manille utilisé pour le levage de l’unité doit être assez robuste pour supporter le poids total de l’unité. Les câbles, chaînes ou élingues de levage ne doivent pas être de longueur identique. Procédez au réglage afin de soulever l’unité de manière équilibrée.

Unit Weight

Table 1. Typical unit weight
Operating Weight (lb)
Model Number
OABD036* 1655 1839 OABD048* 1655 1839 OABD060* 1655 1839 OABD072* 1695 1879 OABD084* 1695 1879 OABD096* 1695 1879 OABD108* 1736 1920 OAGD120* 2912 3198 OAGD144* 2912 3198 OAGD180* 2913 3199 OAGD210* 3062 3348 OAGD240* 3134 3439 OAGD264* 3135 3439 OAGD300* 3175 3489 OAGD360* 3186 3500
Note: Minimum and maximum weights vary widely due to the highly
configurable nature of the product.
Min Max
WARNING
Improper Unit Lift!
Failure to properly lift unit could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury, and equipment or property-only damage. Test lift unit approximately 24 inches to verify proper center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level.
AVERTISSEMENT
Levage inapproprié de l’unité!
Le non-respect des instructions ci-dessous ou un levage inapproprié de l’unité peut provoquer sa chute voire écraser l’opérateur/le technicien, ce qui peut occasionner des blessures graves voire mortelles, et éventuellement endommager l’équipement ou provoquer des dégâts matériels. Faites un test de levage de l’unité d’environ 60 cm (24 po) afin de vérifier que le point de levage correspond au centre de gravité de l’appareil. Pour éviter une chute de celle-ci, ajustez son point de levage si elle n’est pas à l’horizontale.
16 OAU-SVX005C-EN
Unit Weight and Rigging
A
DETAIL A
SCALE 1 : 12
SCREW PIN SHACKLE
4 LOCATIONS
SPREADER BARS
6-point lift
(Model: Direct-fired OAB)
SPREADER
BARS
A
SCALE 1 : 12
DETAIL A
SCREW PIN SHACKLE
4 LOCATIONS
4-point lift
(Model: Direct-fired OAG)

Rigging

Figure 7. Rigging
3. Test-lift the unit to ensure it is properly rigged and balanced, make any necessary rigging adjustments.
4. Lift the unit and position it into place. Remove fork pockets prior to setting on the curb.
5. Downflow units; align the base rail of the unit with the curb rail while lowering the unit onto the curb. Make sure that the gasket on the curb is not damaged while positioning the unit.
Before proceeding, refer to Table 1, p. 16 for typical unit operating weights and Figure 7, p. 17 for rigging drawing.
1. Rig the unit as shown in Figure 7, p. 17. Attach adequate strength lifting slings to all four lifting brackets in the unit base rail. Do not use cables, chains, or slings except as shown.
2. Install a lifting bar, as shown in Figure 7, p. 17, to protect the unit and to facilitate a uniform lift. The minimum distance between the lifting hook and the top of the unit should be 7 feet.
OAU-SVX005C-EN 17

Installation

48" Minimum
Airflow
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on the tags, stickers, and labels 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 following instructions: Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.
AVERTISSEMENT
Procédures d’entretien dangereuses!
Le non-respect de toutes les précautions contenues dans ce manuel ainsi que sur les étiquettes et les autocollants peut entraîner des blessures graves voire mortelles. Les techniciens, afin d’être protégés des éventuels risques électriques, mécaniques et chimiques, DOIVENT suivre les précautions contenues dans ce manuel, sur les étiquettes et les autocollants, ainsi que les instructions suivantes : Sauf indication contraire, coupez toute l’alimentation électrique y compris les disjoncteurs à distance et déchargez tous les dispositifs de stockage d’énergie comme les condensateurs avant l’entretien. Respectez les procédures de verrouillage et d’étiquetage appropriées pour éviter tout risque de remise sous tension accidentelle. S’il est nécessaire de travailler avec des composants électriques sous tension, demandez à un électricien qualifié et agréé ou à une autre personne ayant la formation nécessaire pour manipuler des composants électriques sous tension d’exécuter ces tâches.

Ductwork

Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence and to reduce static pressure.
When attaching the ductwork to the unit, provide a water­tight flexible connector at the unit to prevent operating sounds from transmitting through the ductwork.
All outdoor ductwork between the unit and the structure should be weather proofed after installation is completed.
Note: For sound consideration, cut holes in the roof deck
only for the ductwork penetrations. Do not cut out the roof deck within the entire curb perimeter. All
duct work must be installed and connected to top of roof curb before the unit is set on curb.
If a Curb Accessory Kit is not used:
1. Be sure to use flexible duct connections at the unit.
2. Gaskets must be installed around the curb perimeter flange and the supply and return air opening flanges.
Note: For units will electric heat in the primary heating
position, refer to Figure 8.
Figure 8.
Important: Bottom discharge units with open coil
electric heater in primary heat location require discharge duct with 90° elbow. This is a MANDATORY installation requirement.
Note: A minimum 48" of straight duct is required before
an elbow. This is a requirement for both vertical and horizontal discharge regardless of heat type.

General Unit Requirements

The checklist listed below is a summary of the steps required to successfully install a commercial unit. This checklist is intended to acquaint the installing personnel with what is required in the installation process. It does
not replace the detailed instructions called out in the applicable sections of this manual.
Check the unit for shipping damage and material
shortage. File a freight claim and notify appropriate sales representative if damage or shortage is discovered.
Verify that the unit nameplate model, options, and
voltage are correct.
Verify that the installation location of the unit will
provide the required clearance for proper operation.
Assemble and install the roof curb (if applicable).
Refer to the latest edition of the curb installers guide that ships with each curb kit. Check curb for level installation; if not level, shim as required.
Rigging unit (refer to “Unit Weight and Rigging,”
p. 16).
18 OAU-SVX005C-EN
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