Trane OA1D, OA2D, OA3D Installation and Maintenance Manual

Page 1

Installation, Operation, and Maintenance

Horizon™ Outdoor Air Unit

Indirect Gas-Fired/Electric Heat Models: OA1D, OA2D, OA3D

Important: Proper execution of the tasks outlined in this Installation, Operation, and Maintenance manual

require and assume the tec hnician has been certified as a start up technician for the Horiz on 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 airconditioning 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 pr ecautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

April 2014

OAU-SVX01E-EN

Page 2

Introduction

Read this manual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices

Safety advisories appear throughout this manual as required. Y our 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, y ou MUST f ollow r equir ements for field wiring installation and grounding as described in NEC and your local/state electrica l 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 af fect 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. T rane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs.

Important Responsible Refr iger ant Pr actices

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. 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.

WARNING

Personal Protective Equipment (PPE) Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards.

• Before installing/servi cin g th is un it, technicians MUST put on all PPE required for the work being undertaken (Examples; cut r esistant glo v es/sleeves, butyl gloves, saf ety 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 ar ound hazar dous chemi cals, 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 ener gized electr ical contac t, arc, or flash, technicians MUS T put on all PPE in accor dance 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.

Failure to follow instructions could result in death or serious injury.

Page 3

WARNING

Contains Refrigerant!

System contains oil and refrigerant under high pressure. Recover refriger ant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives.

Failure to follow proper procedures or the use of nonapproved refrigerants, refrigerant substitutes, or refrigerant additives could result in death or serious injury or equipment damage.

WARNING

Hazard of Explosion and Deadly Gases!

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 refr igerants 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. Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Introduction

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

OAU-SVX01E-EN (17 Apr 2014)

• Model number updates

OAU-SVX01E-EN 3

Page 4

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings, Cautions, and Notices . . . . . . . . 2

Important Environmental Concerns . . . . . 2

Important Responsible Refrigerant Practice s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Model Number Descriptions . . . . . . . . . . . . . . 6

Horizon Outdoor Air Unit . . . . . . . . . . . . . . . 6

General Information . . . . . . . . . . . . . . . . . . . . . 9

Overview of Manual . . . . . . . . . . . . . . . . . . 9

Model Number Description . . . . . . . . . . . . 9

Unit Nameplate . . . . . . . . . . . . . . . . . . . . . 9

Compressor Nameplate . . . . . . . . . . . . . . . 9

Unit Description . . . . . . . . . . . . . . . . . . . . . 9

Indoor Fan Failure Input . . . . . . . . . . . . . . 9

Low Pressure Control ReliaTel Control . . 9

Refrigerant Circuits . . . . . . . . . . . . . . . . . . 9

High Pressure Control ReliaTel Control . . 9 Space Temperature / RH Sensor (Optional)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

High Temperature Sensor . . . . . . . . . . . . 10

Outdoor Air Temperature and Relative Hu-

midity Sensor . . . . . . . . . . . . . . . . . . . . . . 10

Control Input (Occupied / Unoccupied) . 10

Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . 10

100 Percent Outdoor Air Hood with Damper

and Filters . . . . . . . . . . . . . . . . . . . . . . . . . 10

Modulating Indirect Gas-Fired Burner . . 10 Through the Base Electrical with Disconnect

Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Through the Base Gas Piping . . . . . . . . . 10

Hinged Access Doors . . . . . . . . . . . . . . . . 10

Modulating Electric Heat . . . . . . . . . . . . . 10

Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . 11

First Aid Measures . . . . . . . . . . . . . . . . . . 11

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Unit Clearances . . . . . . . . . . . . . . . . . . . . 11

Unit Clearances, Curb Dimensions, and Dimensional Data

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OA1 Units . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Unit Clearances . . . . . . . . . . . . . . . . . . . . 12

Curb Dimensions . . . . . . . . . . . . . . . . . . . .12

Dimensional Data . . . . . . . . . . . . . . . . . . . .13

OA2 Units . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Unit Clearances . . . . . . . . . . . . . . . . . . . . .14

Curb Dimensions . . . . . . . . . . . . . . . . . . . .15

Dimensional Data . . . . . . . . . . . . . . . . . . . .15

OA3 Units . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Unit Clearances . . . . . . . . . . . . . . . . . . . . .16

Curb Dimensions . . . . . . . . . . . . . . . . . . . .17

Dimensional Data . . . . . . . . . . . . . . . . . . . .17

Unit Weight and Rigging . . . . . . . . . . . . . . . . .18

Unit Weight . . . . . . . . . . . . . . . . . . . . . . . . .18

Corner Weight . . . . . . . . . . . . . . . . . . . . . .19

Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Sequence of Operation . . . . . . . . . . . . . . . . . . .21

Space Control with Indirect Gas-Fired or Electric Heat and Modulating HGRH, ERV, and Powered Ex.

Sequence of Operation—”Occupied” . . .21 Sequence of Operation—”Unoccupied” .22

. . . . . . . . . . . . . . . . . . . . . . . . . .21

Discharge Air Control with Indirect Gas-Fired or Electric Heat and Modulating HGRH, ERV, and Powered Ex.

Sequence of Operation—”Occupied” . . .23 Sequence of Operation—”Unoccupied” .24

. . . . . . . . . . . . . . . . . . . . . .23

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . .25

General Unit Requirements . . . . . . . . . . . .25

Main Electrical Power Requirements . . . .26

Condensate Drain Configuration . . . . . . .26

Filter Installation . . . . . . . . . . . . . . . . . . . . .26

Field Installed Power Wiring . . . . . . . . . . .26

Main Unit Power . . . . . . . . . . . . . . . . . . . . . .28

Standard Wiring . . . . . . . . . . . . . . . . . . . . .28

Voltage Imbalance . . . . . . . . . . . . . . . . . . .28

Electrical Phasing (Three-Phase Motors) .29

Compressor Crankcase Heaters . . . . . . . .29

Main Unit Display and Relia T el Controls .30

Field-Installed Control Wiring . . . . . . . . . .30

Control Power Transformer . . . . . . . . . . .30

4 OAU-SVX01E-EN

Page 5

Controls Using 24 Vac . . . . . . . . . . . . . . . 30

Controls Using DC Analog Input/Output (Standard Low Voltage Multiconductor Wire)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

DC Conductors . . . . . . . . . . . . . . . . . . . . . . . 31

System Configuration and Pre-Start . . . . . . 33

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Indirect Gas-Fired Heating Start-Up . . . . . 36

Start-Up Procedure . . . . . . . . . . . . . . . . . 36

Safety Controls . . . . . . . . . . . . . . . . . . . . . 39

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Monthly Maintenance . . . . . . . . . . . . . . . . . 40

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Supply/Return Air Smoke Detector Mainte-

nance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Cooling Season . . . . . . . . . . . . . . . . . . . . 40

Heating Season . . . . . . . . . . . . . . . . . . . . 40

Condenser Coil Cleaning . . . . . . . . . . . . . 40

Final Process . . . . . . . . . . . . . . . . . . . . . . . . . 41

Performance Data . . . . . . . . . . . . . . . . . . . . . . 42

Superheat and Refrigeration Circuit Data 48

Alarms and Troubleshooting . . . . . . . . . . . . 52

Microprocessor Control . . . . . . . . . . . . . . 52

System Alarms . . . . . . . . . . . . . . . . . . . . . 52

Sensor Failure Alarm Display . . . . . . . . . 52

RTRM Failure Modes . . . . . . . . . . . . . . . . 54

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

OAU Filter Guide . . . . . . . . . . . . . . . . . . . . . 55

OAU-SVX01E-EN 5

Page 6

Model Number Descriptions

OA2D300A4 -D1A1A0GM-G1KB0AC3CJ -A41B102A0

1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839

Horizon Outdoor Air Unit

Digit 1, 2 — Unit Type

OA = Outdoor Air

Digit 3 — Cabinet Size

1 = 625 cfm–4,000 cfm 2 = 1,500 cfm–9,000 cfm 3 = 3,750 cfm–13,500 cfm

Digit 4 — Major Design Sequence

C = Revision 4 D = Revision 5 E = Heat Pump

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 B

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)

Circuit)

Circuit Only)

and 2nd Circuit)

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

Circuit

and 2nd Circuit

Circuit

and 2nd Circuit

Circuit

and

Digit 16 — Indoor Fan Motor (IFM)

0 = Direct Drive w/VFD 1 = Direct Drive (VFD by Others) 2 = Belt Drive 3 = Belt Drive w/VFD 4 = Direct Drive w/Shaft Grounding

5 = Special Motor Option

Ring w/VFD

Digit 17 — Indoor Fan Wheel

A=122 B = 122.6 C=150 D = 150.6 E=165 F = 165.6 G=182 H = 182.6 J=200 K = 200.6 L = 182 X 2 M = 182.6 X 2

Digit 18 — Indoor Fan Motor Power (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) B = Direct-Fired (DF) C = Electric—4-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/SEC-ELEC) J= Hot Water K = Steam

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

6 OAU-SVX01E-EN

Page 7

Model Number Descriptions

Digit 22 — Heat Capacity (Primary Heat Source)

Digit IF ELEC

0 No Heat No Heat A50 MBh10 kW B75 MBh20 kW C100 MBh24 kW D125 MBh28 kW E150 MBh32 kW F200 MBh40 kW G250 MBh48 kW H300 MBh60 kW J350 MBh68 kW K400 MBh79 kW

L500 MBh99 kW M 600 MBh 111 kW N 700 MBh 119 kW

P 800 MBh 139 kW R 1000 MBh 159 kW S179 kW

T199 kW U215 kW X Special Heater Option

Digit 23 — Heat Capacity (Secondary Heat Source)

Digit

0 No Heat/No Secondary Heat A 50 MBh 10 kW 300 MBh B 75 MBh 20 kW 600 MBh C 100 MBh 24 kW 900 MBh D 125 MBh 28 kW 1200 MBh

E150 MBh32 kW

F200 MBh40 kW G250 MBh48 kW H300 MBh60 kW

J350 MBh68 kW K400 MBh79 kW

L500 MBh99 kW M 600 MBh 111 kW N 700 MBh 119 kW

P 800 MBh 139 kW R 1000 MBh 159 kW S179 kW

T199 kW U215 kW

IF ELEC DF

Digit 24 — Corrosive Environment Package

0 = No Corrosive Package 1 = S/S Cabinet, Basepan,

2 = S/S Cabinet, Basepan 3 = S/S Basepan, Eco-Coated Coils 4 = S/S Coil Casing 5 = S/S Interior Casing 6 = Eco-Coated Coils 7 = S/S Coil Casing with

8 = Copper/Copper Condenser,

Eco-Coated Coils

Eco-Coated Coils 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

AH = Trane—Discharge Air 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)

AK = Trane—Multi-Zone VAV Control

w/LON Read-Write w/Display

AL = Trane—Multi-Zone VAV Control

w/BACnet w/Display

AM= Trane—Multi-Zone VAV Control

w/LON Read-Write (No Display)

AN = Trane—Multi-Zone VAV Control

w/BACnet (No Display)

AO = Trane—Single-Zone VAV Control

w/LON Read-Write w/Display

AP = Trane—Single-Zone VAV Control

w/BACnet w/Display

AQ = Trane—Single-Zone VAV Control

w/LON Read-Write (No Display)

AR = Trane—Single-Zone VAV Control

w/BACnet (No Display)

Digit 27 — Pow ered Exhaust Fan Motor (PFM) and Exhaust Dampers

0 = No Powered Exhaust 1 = Direct Drive w/VFD and Gravity

Dampers 2 = Direct Drive (VFD by Others) 3 = Belt Drive 4 = Belt Drive w/VFD 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 — Pow ered Exhaust Fan Wheel

0 = No Powered Exhaust A= 122 B = 122.6 C= 150 D = 150.6 E= 165 F = 165.6 G= 182 H = 182.6 J= 200 K = 200.6 L = 182 X 2 M = 182.6 X 2

Digit 29 — Pow ered Exhaust Fan Motor Power

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= No ERV A = ERV-Composite Construction B = ERV—Composite Construction

with Frost Protection w/VFD

C = ERV—Composite Construction

with Bypass

D = ERV—Composite Construction

with Frost Protection and Bypass E = ERV—Aluminum Construction F = ERV—Aluminum Construction

with Frost Protection w/VFD G = ERV—Aluminum Construction

with Bypass H = ERV—Aluminum Construction

with Frost Protection and Bypass

Digit 32 — ERV Size

0= No ERV 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 Da mpers

w/Economizer

OAU-SVX01E-EN 7

Page 8

Model Number Descriptions

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 M = MERV-8 30%, ALM, and TCACS N = MERV-13 80%, ALM, and TCACS P = MERV-14 95%, ALM, and TCACS Q = MERV-8 30%, MERV-13 80%,

ALM, and TCACS R = MERV-8 30%, MERV-14 95%,

ALM, 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

Detector

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

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

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

Digit 38 — Accessories

0 = No Options A = Hailguards B = LED Service Light and C = Hailguards and LED Service

Light

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

8 OAU-SVX01E-EN

Page 9

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 dama ge 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 Descriptions,” p. 6). 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.

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 Fa ilure Switc h (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 pro ve 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 ReliaT el™ control will not allow the af fected 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

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 Main Unit Display and the RTRM are mounted in the Main Control Panel. The Main Unit Display and RTRM

OAU-SVX01E-EN 9

For 5–7 ton units, one refrigerant circuit shall incorporate a standard 6-row coil. For 8–54 ton units, two independent refrigerant circuits shall incorporate an interlaced coil. All circuits shall have thermal expansion valves (TXVs), service pressure ports and refrigerant line filter driers as standard. An area will be provided for replacement suction line driers. Refrigerant circuit one (1 with a factory installed and preset refrigerant capacity control (RCC) to prevent evaporator coil temperatures below approximately 38°F (1 14 lb suction). The refrigerant capacity device is not installed when the unit is equipped with a digital scroll.

Stage) is equipped

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 re spective RTRM senses a lack of current while calling for cooling and locks the compressor out.

Page 10

General Information

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. Refer to “Space Control with

Indirect Gas-Fired or Electric Heat and Modulating HGRH, ERV, and Powered Ex.,” p. 21 for specific details.

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 (MDTS) is 90°F (adj 70–100°F), the unit will be shut down, and require a manual restart if Disch arge 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, 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 sens e both outdoor air temperature and relative humidity for use by the microprocessor controller to make required ventilation, cooling, dehumidification and heating decisions. Refer to “Sequence of Operation,” p. 21 for detailed unit control and operational modes.

Control Input (Occupied / Unoccupied)

Terminals are provided on the terminal strip labeled OAUTS for a field installed dry contact or switc h 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. Refer to the

“Sequence of Operation,” p. 21 for detailed unit control

and operational modes.

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 tubu lar design capable of draining internal condensate. External flue to be constructed of type 430 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 electri cal 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 switc h 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.

Modulating Electric Heat

The unit may have fully modulating, SCR, or Verniercontrolled, 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. 25.

100 Percent Outdoor Air Hood with Damper and Filters

Factory-installed an d -in t eg rated 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 installed 100 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

10 OAU-SVX01E-EN

Page 11

General Information

Unit Inspection

WARNING

Fiberglass Wool!

Product may contain fiberglass wool. Disturbing the insulation in this product during installation, maintenance or rep air 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.

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 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 e vidence that the damage did not occur after delivery.

 Notify the appropriate sales representative before

installing or repairing a damaged uni t.

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. Isolat e al l side p anel servi ce 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 start-up.

Note: Do not use the unit’s heater for temporary heat

without first completing the start-up procedure detailed in “Start-Up,” p. 36.

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. 12 contains figures that illustrate the minimum

operating and service clearances for either a single or multiple unit installation: Figure 1, p. 12 and Figure 2, p. 12 for OA1 units,Figure 7, p. 14 through Figure 10, p. 15 for OA2 units, and Figure 15, p. 16 through Figure 18, p. 17 for OA3 units. These clearances are the minimum distances necessary to assure adequate serviceability, cataloged unit capacity, an d 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.

• Avoid breathing fibergl as s dust.

• Use a NIOSH approved dust/mist respirator.

• Avoid contact with the skin or eyes. W ear 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.

OAU-SVX01E-EN 11

Page 12

Unit Clearances, Curb Dimensions, and Dimensional

CLEARANCE 36"

TOP OF UNIT 72"

CLEARANCE 60"

CLEARANCE 36"

CLEARANCE FROM

CLEARANCE 48"

3'-0"

4'-0"

7'0"

6'0"

3'0"

4'0"

3'0"

2öļ

8õļ

7öļ

19ļ

õļ

1ôļ

4ôļ

49ļ

1õļ

öļ

1.00 TYP.

Data

WARNING

Combustible Materials!

Maintain proper clearance between the unit heat exchanger, vent surfaces and combustible materials. Refer to unit nameplate and installation instructions for proper clearances. Improper clearances could result in a fire hazard. Failure to maintain proper clearances could result in death or serious injury or property damage.

OA1 Units

Unit Clearances

Figure 1. Typical installation clearances for OA1 unit

Figure 2. Typical installation clearances for OA1 unit

with auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Curb Dimensions

Figure 3. Unit curb data for OA1 5–15 tons

12 OAU-SVX01E-EN

Page 13

Unit Clearances, Curb Dimensions, and Dimensional Data

GUTTER DETAIL

Ɍļ

ôļ

GUTTER

õļ

19"

8õļ

40"

12ɍļ

3ôļ

Ɍļ

1ôļ

7öļ

4ôļ

49"

1õļ

öļ

1.00 TYP.

28öļ

53.00

59.45

87.12

36.71

87.33

59.23

87.18

29.63

87.33

59.23

53.00

131.26

87.12

59.45

35.24

Figure 4. Unit curb data for OA1 5–15 tons with

auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Dimensional Data

Figure 5. Unit dimensional data for OA1 5–15 tons (in.)

Figure 6. Unit dimensional data for OA1 5–15 tons

with auxiliary cabinet (in.)

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

OAU-SVX01E-EN 13

Page 14

Unit Clearances, Curb Dimensions, and Dimensional Data

CLEARANCE 36"CLEARANCE 60"

TOP OF UNIT 72"

CLEARANCE 36"

CLEARANCE FROM

CLEARANCE 48"

3'0"

4'0"

3'0"

TOP OF UNIT 72"

"63 ECNARAELC"06 ECNARAELC

CLEARANCE 36"

CLEARANCE FROM

CLEARANCE 48"

3'0"

4'0"

3'0"

7'0"

6'0"

OA2 Units

Unit Clearances

Figure 7. Typical installation clearances for OA2 unit

Figure 8. Typical installation clearances for OA2 unit

with auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Figure 9. Typical installation clearances for OA2 unit

14 OAU-SVX01E-E N

Page 15

Unit Clearances, Curb Dimensions, and Dimensional Data

7'0"

6'0"

PPL

öļ

1ļ

TYP.

30ļ

29ļ

56ļ

2õļ

5ôļ

9ôļ

ļ

1õļ

GUTTER

1õļ

ļ

16Ɍļ

29ļ

9Ɏļ

56ļ

5ôļ

öļ

õļ

30ļ

58ļ

5ôļ

Ɍļ

1ļ

TYP.

GUTTER DETAIL

Ɍļ

ôļ

80.57

OF AIR INLET

106.45

66.83

106.00

135.52

94.21

43.02

BASE TO BOTTOM

60.00

80.57

106.00

94.21

62.11

66.83

60.00

106.10

200.99

OF AIR INLET

43.02

BASE TO BOTTOM

62.51

Figure 10. Typical installation clearances for OA2 unit

with auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Curb Dimensions

Figure 11. Unit curb data for OA2 12–30 tons (in.)

Dimensional Data

Figure 13. Unit dimensional data for OA2 12–30 tons

Figure 14. Unit dimensional data for OA2 12–30 tons

with auxiliary cabinet

Figure 12. Unit curb data for OA2 12–30 tons with

auxiliary cabinet (in.)

Note: Certain options require auxiliary cabinet. Refer to

OAU-SVX01E-EN 15

project-specific unit submittals.

Page 16

Unit Clearances, Curb Dimensions, and Dimensional Data

TOP OF UNIT 72"

"63 ECNARAELC"06 ECNARAELC

CLEARANCE 36"

CLEARANCE FROM

CLEARANCE 48"

3'0"

4'0"

3'0"

CLEARANCE 36"

TOP OF UNIT 72"

CLEARANCE 36"CLEARANCE 60"

CLEARANCE FROM

CLEARANCE 48"

3'0"

4'0"

3'0"

7'0"

6'0"

OA3 Units

Unit Clearances

Figure 15. Typical installation clearances for OA3 unit

Figure 16. Typical installation clearances for OA3 unit

with auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Figure 17. Typical installation clearances for OA3 unit

16 OAU-SVX01E-EN

Page 17

Unit Clearances, Curb Dimensions, and Dimensional Data

7'0"

6'0"

öļ

33ļ

63ļ

5ôļ

140ļ

13ôļ

1ļ

TYP.

5ɏļ

2õļ

2ɍļ

GUTTER

1ļ

TYP.

63ļ

202ļ

5ɏļ

5ôļ

140ļ

33ļ

öļ

5ɏļ

2õļ

13ôļ

Ɍļ

5ɍļ

2ɍļ

GUTTER DETAIL

Ɍļ

ôļ

144.00

67.00

74.63

144.17

42.00

92.07

98.49

48.62

62.00

67.00

74.63

98.49

144.00

92.07

144.17

35.84

Figure 18. Typical installation clearances for OA3 unit

with auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Curb Dimensions

Figure 19. Unit curb data for OA3 30–54 tons

Dimensional Data

Figure 21. Unit dimensional data for OA3 30–54 tons

Figure 22. Unit dimensional data for OA3 30–54 tons

with auxiliary cabinet

Figure 20. Unit curb data for OA3 30–54 tons with

auxiliary cabinet

Note: Certain options require auxiliary cabinet. Refer to

project-specific unit submittals.

Note: Certain options require auxiliary cabinet. Refer to

OAU-SVX01E-EN 17

project-specific unit submittals.

Page 18

Unit Weight and Rigging

WARNING

Heavy Objects!

Do not use cables (chains or slings) except as shown. Each of the cables (chains or slings) 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. Other lifting arrangements may cause equipment or property-only damage. F ailure to pr operly lift unit could result in death or serio us in jury. See details below.

WARNING

Improper Unit Lift!

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. Failure to properly lift unit could result in death or serious injury or possible equipment or property-only damage.

Unit Weight

Table 1. Typical unit weight and center-of-gravi ty

(CG)—units without auxiliary cabinet

Operating

Model Number

OA1D060* 1811 2275 1898 2362 40 30 OA1D072* 1811 2330 1898 2417 40 30 OA1D084* 1811 2330 1933 2452 40 30 OA1D096* 1901 2596 2059 2754 40 30 OA1D120* 1901 2596 2089 2784 40 30 OA1D144* 1901 2596 2112 2807 40 30 OA1D180* 1901 2734 2192 3025 40 30 OA2D144* 3125 3790 3335 4000 49 34 OA2D180* 3289 3954 3580 3871 49 34 OA2D210* 3344 4161 3687 4030 49 34 OA2D240* 3372 4189 3764 4156 49 34 OA2D264* 3372 4189 3764 4156 49 34 OA2D300* 3530 4390 4012 4494 49 34 OA2D360* 3338 4198 3820 4302 49 34 OA3D360* 4931 5914 5576 6221 67 38 OA3D420* 5246 6229 5892 6538 67 38 OA3D480* 5339 6351 6014 6689 67 38 OA3D540* 5406 6363 6026 6646 67 38 OA3D600* 5570 6652 6343 7116 67 38 OA3D648* 5582 6664 6355 7128 67 38

Note: Minimum and maximum weights vary widely due to the highly

configurable nature of the product.

Weight (lb)

Min Max Min Max Length Width

Shipping

Weight (lb)

Center-of-

gravity (in.)

18 OAU-SVX01E-EN

Page 19

Unit Weight and Rigging

OALCabinet

INTAKE HOOD

OA1,OA2,andOA3Cabinets

INTAKE HOOD

CONDENSERSECTION

Table 2. Typical unit weight and center-of-gravity

(CG)—units with auxiliary cabinet

Operating

Model Number

OA1D060* 2798 3262 2885 3349 56 29 OA1D072* 2743 3262 2830 3349 56 29 OA1D084* 2775 3294 2897 3416 56 29 OA1D096* 2927 3622 3085 3780 56 29 OA1D120* 2927 3622 3115 3810 56 29 OA1D144* 2927 3622 3138 3833 56 29 OA1D180* 2927 3760 3218 4051 56 29 OA2D144* 4508 5173 4718 5383 72 33 OA2D180* 4715 5380 4632 5297 72 33 OA2D210* 5028 5845 4897 5714 72 33 OA2D240* 5056 5873 5023 5840 72 33 OA2D264* 5056 5873 5023 5840 72 33 OA2D300* 5194 6054 5298 6158 72 33 OA2D360* 4936 5796 5040 5900 72 33 OA3D360* 6907 7890 7214 8197 81 37 OA3D420* 7222 8205 7531 8514 81 37 OA3D480* 7315 8327 7653 8665 81 37 OA3D540* 7382 8339 7665 8622 81 37 OA3D600* 7527 8609 7991 9073 81 37 OA3D648* 7539 8621 8003 9085 81 37

Note: Minimum and maximum weights vary widely due to the highly

configurable nature of the product.

Weight (lb)

Min Max Min Max Length Width

Shipping

Weight (lb)

Center-of-

gravity (in.)

Figure 23. Cabinet corners

Corner Weight

Table 3. Corner weights (percent of total weight)

Percentage (%)

Cabinet Size

OA1* without auxiliary cabinet

OA1* with auxiliary cabinet

OA2* without auxiliary cabinet

OA2* with auxiliary cabinet

OA3* without auxiliary cabinet

OA3* with auxiliary cabinet

Note: Actual corner weights will vary depending on components selected.

Corner A Corner B Corner C Corner D

16.3 20.7 33.3 29.7

18.2 23.2 27.5 31.1

20.1 17.2 34.0 28.7

18.3 24.0 32.5 25.2

14.9 24.2 29.9 31.0

16.8 23.6 28.5 31.1

OAU-SVX01E-EN 19

Page 20

Unit Weight and Rigging

SPREADER BARS

LENGTH

WIDTH

LIFTING POINTS (4 LOCATIONS)

4-point lift

SPREADER BARS

LENGTH

WIDTH

LIFTING POINTS (6 LOCATIONS)

DETAIL A

SCALE 1 : 12

6-point lift

Rigging

Figure 24. Rigging and center-of-gravity data

sure that the gasket on the curb is not damaged while positioning the unit.

Refer to Table 1, p. 18, Table 2, p. 19, and Figure 24, p. 20 for typical unit operating weights rigging before proceeding.

1. Remove the shipping crate from around the unit.

2. Rig the unit as shown in Figure 24, p. 20. 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.

3. Install a lifting bar, as shown in Figure 24, p. 20, 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.

4. Test-lift the unit to ensure it is properly rigged and balanced, make any necessary rigging adjustments.

5. Lift the unit and position it into place. Remove fork pockets prior to setting on the curb.

6. Downflow units; align the base rail of the unit with the curb rail while lowering the unit onto the curb. Make

20 OAU-SVX01E-EN

Page 21

Sequence of Operation

Space Control with Indirect GasFired or Electric Heat and Modulating HGRH, ERV, and Powered Ex.

Sequence of Operation—”Occupied”

Optional space temperature and/or humidity sensor s must be installed and wired to unit and configured as “installed” at the main unit controller.

Emergency Stop. When the contacts at Terminal

OAUTS 9 and 10 are open, the unit’s operation will be in Alarm Status. The Alarm must be reset from either the BAS or the optional on-board unit display.

Alarms must be reset from the optional on-board unit display or remote BAS to restart the control sequence. If optional display is not installed; T racer TU must be used to diagnose and clear alarm. If Tracer TU is not available, cycle main power to unit to clear alarm.

Important: Cycling power to unit to clear alarm may not

resolve alarm condition.

Starting Sequence

When 3-phase is powered to unit the main unit controller and the RTRM will initializ e. Initialization process requires approximately 3 minutes.

The unit is placed in occupied operation via either the BAS or by closing connection between unit terminals OAUTS 7 and 8. The unit must not be in lockout.

Starting Sequence with No Retur n Air D amper Installed

The outdoor air damper will be commanded to open. The damper end switch will make causing the main unit controller to initialize the indoor fan star tin g sequence by sending a preset run signal (field adjustable betwe en 50 percent and 100 percent) to the indoor fan VFD. If after 30 seconds the indoor fan proving switch does not prove the indoor fan on, the main unit controller will co mmand the indoor fan off and signal an alarm.

Starting Sequence with Optional Return Air Damper Installed

Identical to sequence with no return air damper except the outdoor air and return air dampers will be commanded to move to their preset occupied positions. Outdoor air damper end switch is disabled when the return air damper is installed.

C. Dehumidification D. Cooling All modes are enabled by the main unit control module.

The control module calculates dewpoint based on sensed air temperature and humidity.

A. Economizer Mode. Economizer mode is enabled

based on outdoor air dewpoint. Operation in economizer mode is enabled when the outdoor air dewpoint remains below the outdoor air economizer enable dewpoint setpoint. Operation in economizer mode continues until outdoor air conditions call for either dehumidi fication, cooling or heating mode. Space call for h eating, dehumidification or cooling will cancel call for economiz er operation.

B. Heating Mode. Heating mode is enabled on space

heating setpoint. The main unit controller will modulate the heating output to maintain the space heating setpoint. Maximum discharge air heating temperature is adjustable—default maximum is 90ºF. Hot gas reheat is disabled when heating is enabled.

C. Dehumidification Mode. Dehumidification mode is

enabled on space dewpoint setpoint if no call for heat ing is enabled. The unit’s controller will activate the dehumidification mode when space dewpoint is higher than or equal to space dewpoint setpoint. Compressor control is based on evaporator leaving air tempera ture setpoint. With dehumidification enabled, if evaporator leaving air temperature is above setpoint first stage dehumidification (Compressor 1) will start. If after a 3-minute minimum delay the evapor a t o r le av ing air temperature is still above the setpoint, the second, third, and fourth stages of dehumidification (Compressor 2, 3, and 4) will be staged on sequentially following individual 3-minute minimum delays between each call.

Dehumidification mode will remain active if outdoor air is above outdoor air dehumidification setpoint. Space call for heating will cancel outdoor air dehumidification.

During operation in dehumidification mode, the main unit controller will enable hot gas reheat. Hot gas reheat will modulate to maintain the space cooling setpoint.

D. Cooling Mode . Cooling mode is enabled on space

cooling setpoint if no call for heating or dehumidification is present. Compressor staging is identical to dehumidification however control temperature is space cooling setpoint.

During operation in cooling mode hot gas reheat is enabled. Hot gas reheat is controlled to maintain space cooling setpoint.

Operating Modes

A. Economizer (Ventilation) B. Heating

OAU-SVX01E-EN 21

Page 22

Sequence of Operation

Optional Features

Digital Compressors

Main unit controller will modulate digital compressor to maintain either evaporator leaving or space temperature setpoints depending on mode of operation. Remaining compressors will be staged as described in mode.

ERV and Powered Exhaust

ERV and powered exhaust are interlocked with indoor fan operation in occupied heating, dehumidification or cooling modes. Outdoor air sensors sending temperature and Rh signals to the main unit controller to make mode calls are relocated downstream of the ERV. Outdoor air heating and dehumidification override setpoints will be based on ERV leaving conditions. Additional sensors will be installed in the non-ERV outdoor air position for information purposes and those outdoor air readings may be viewed at the main unit co ntroller or via the BAS. When operating in economizer mode the ERV is disabled and the ERV by-pass damper(s) open, powered exhaust remains on and is adjusted to 100 percent capacity by the main unit controller. The m ain unit controller will end ERV operation and open ERV bypass dampers if outdoor air/return air conditions could cause ERV frosting, powered exhaust remains on.

Note: For units with optional ERV defrost heater, the

control sequence will engage heater at frost condition rather than stop ERV.

The powered exhaust fan speed is factory set to run between 50 percent and 100 percent (field adjustable).

Hot Gas Reheat

Following continuous 30-minute hot gas reheat operation at less than 100 percent reheat capacity a purge cycle will be initiated. During the purge cycle the, hot gas reheat signal is set and held at 100 percent for a period of 3 minutes. Following the purge cycle, normal operation resumes.

Sequence of Operation—”Unoccupied”

Emergency Stop. When the contacts at Terminal

OAUTS 9 and 10 are open, the unit’s operation will be in Alarm Status. The Alarm must be reset from either the BAS or the optional on-board unit display.

Starting Sequence with No Return Air Damper Installed.

damper installed.

Identical to occupied sequence no return air

Operating Modes

A. Unoccupied Heating B. Unoccupied Dehumidification C. Unoccupied Cooling

A. Heating Mode. Unoccupied heating is enabled

based on unoccupied space heating setpoint. Unoccupied heating is enabled when space temperature reaches unoccupied space heating setpoint - 2°. The modulating gas heat or SCR electric heat will continue to raise the discharge air temperature to a maximum of 90°F and continue to supply heated 90° air to the space until the space temperature reaches setpoint + 2°. Unit operation is discontinued when unoccupied space heating is sati sfied.

B. Dehumidification Mode. When no call for

unoccupied heating exists, unoccupied dehu midification is enabled based on unoccupied space dewpoint set point. During unoccupied dehumidification operation dehumidification capacity is restricted to 50 percent (only half of the compressors are allowed to come on). Unoccupied dehumidification is enabled when space temperature reaches unoccupied space dehumidification setpoint + 1°. Dehumidification stops at setpoint - 1°. Unit operation is discontinued when unoccupied space dehumidification is satisfied.

C. Cooling Mode. When no call for unoccupied heating

or unoccupied dehumidification exists, unoccupied cooling is enabled based on unoccupied space cooling setpoint. During unoccupied space cooling operation cooling capacity is restricted to 50 percent (only half of the compressors are allowed to come on). Unoccupied cooling is enabled when space temperature reaches unoccupied space cooling setpoint + 2°. Cooling stops at setpoint - 2°. Unit operation is discontinued when unoccupied space cooling is satisfied.

Powered Exhaust/ERV Sequence of Operation

Powered Exhaust/ERV operation is disabled during unit “Unoccupied” operating modes.

Starting Sequence

Indoor fan proving sequence is identical to occupied operation.

Starting Sequence with Optional Return Air Damper Installed

The outdoor air damper will be commanded to close and the return air damper will open. Outdoor air damper end switch is disabled when the return air damper is installed.

22 OAU-SVX01E-EN

Page 23

Sequence of Operation

Dischar ge Air Control with Indirect Gas-Fired or Electric Heat and Modulating HGRH, ERV, and Powered Ex.

Sequence of Operation—”Occupied”

Emergency Stop. When the contacts at Terminal

OAUTS 9 and 10 are open, the unit’s operation will be in Alarm Status. The Alarm must be reset from either the BAS or the optional on-board unit display.

Important: Cycling power to unit to clear alarm may not

resolve alarm condition.

Starting Sequence

When 3-phase is powered to unit the main unit controller and the RTRM will initializ e. Initialization process requires approximately 3 minutes.

The unit is placed in occupied operation via either the BAS or by closing connection between unit terminals OAUTS 7 and 8. The unit must not be in lockout.

Starting Sequence with No Retur n Air D amper Installed

Operating Modes

A. Economizer (Ventilation) B. Heating C. Dehumidification D. Cooling All modes are enabled by the main unit control module.

The control module calculates dewpoint based on sensed outdoor air temperature and humidity.

A. Economizer Mode. Operation in economizer mode

is enabled when the outdoor air temperature is between the Outdoor Air Cooling Setpoint and the Outdoor Air Heating setpoint and no call for dehumidification exists. Operation in economizer mode continues until o utdoor air conditions call for either dehumidification, cooling or heating mode.

B. Heating Mode. Heating mode is enabled on outdoor

air heating setpoint. The main unit controller will modulate the heating capacity to maintain the discharge air heating setpoint. Hot gas reheat is disabled when heating is enabled. Heating will be disabled at outdoor air heating setpoint + 2°.

C. Dehumidification Mode. Dehumidification mode is

enabled on outdoor air dewpoint enable setpoi nt if no call for heating is enabled. The unit’s controller will activate the dehumidification mode when outdoor air dewpoint is higher than or equal to outdoor air dewpoint setpoint. Compressor control is based on evaporator leaving air temperature setpoint. With dehumidification enabled, if evaporator leaving air temperature is above setpoint first stage dehumidification (Compressor 1) will start. If after a 3-minute minimum delay the evapor a t o r le av ing air temperature is still above the evaporator leaving air temperature setpoint, the second, third, and four th stages of dehumidification (Compressor 2, 3, and 4) will be staged on sequentially following individual 3-minute minimum delays between eac h cal l. Deh um id ifi cati on mode will be disabled at outdoor air dewpoint setpoint

- 2°. During operation in dehumidification mode, the main unit

controller will enable hot gas reheat. Hot gas reheat will modulate to maintain the discharge air cooling setpoint.

C. Cooling Mode. Cooling mode is enabled on outdoor

air cooling setpoint if no call for heating or dehumidification is present. Compressor staging is identical to dehumidification; however, control temperature is discharge air cool ing setpoint. Cooling will be disabled at outdoor air cooling setpoint - 2°.

During operation in cooling mode hot gas reheat is enabled. Hot gas reheat is controlled to maintain discharge air cooling setpoint.

Optional Features

Digital Compressors

Main unit controller will modulate digital compressor to maintain either evaporator leaving or discharge air temperature setpoints depending on mode of operation. Remaining compressors will be staged as described in mode.

ERV and Powered Exhaust

OAU-SVX01E-EN 23

Page 24

Sequence of Operation

calls are relocated downstream of the ERV . Mode calls will be based on ERV leaving conditions. Additional sensors will be installed in the non-ERV outdoor air position for information purposes and those outdoor air readings may be viewed at the main unit co ntroller or via the BAS. When operating in economizer mode the ERV is disabled and the ERV by-pass damper(s) open, powered exhaust remains on and is adjusted to 100 percent capacity by the main unit controller. The m ain unit controller will end ERV operation and open ERV bypass dampers if outdoor air/return air conditions could cause ERV frosting, powered exhaust remains on.

Note: For units with optional ERV defrost heater, the

control sequence will engage heater at frost condition rather than stop ERV.

The powered exhaust fan speed is factory set to run between 50 percent and 100 percent (field adjustable).

Hot Gas Reheat

Sequence of Operation—”Unoccupied”

Optional space temperature and/or humidity sensor s must be installed and wired to unit and configured as “installed” at the main unit controller to enable unoccupied sequences.

Emergency Stop. When the contacts at Terminal

OAUTS 9 and 10 are open, the unit’s operation will be in Alarm Status. The Alarm must be reset from either the BAS or the optional on-board unit display.

A. Heating Mode. Unoccupied heating is enabled

B. Dehumidification Mode. When no call for

C. Cooling Mode. When no call for unoccupied heating

Powered Exhaust/ERV Sequence of Operation

Powered Exhaust/ERV operation is disabled during unit “Unoccupied” operating modes.

Starting Sequence

Indoor fan proving sequence is identical to occupied operation.

Starting Sequence with Optional Return Air Damper Installed

The outdoor air damper will be commanded to close and the return air damper will open. Outdoor air damper end switch is disabled when th e return air damper is installed.

Starting Sequence with No Retur n Air D amper Installed

Identical to occupied sequence no return air damper installed.

Operating Modes

A. Unoccupied Heating B. Unoccupied Dehumidification C. Unoccupied Cooling

24 OAU-SVX01E-EN

Page 25

Installation

48" Minimum

Airflow

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electr ical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, 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 pow er can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licen sed el ectrician or other individual who has been trained in handling live electrical components perf o rm these tasks. Failure to follow all of the safety warnings provided could result in death or serious injury.

Ductwork

Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence and to reduce static pressure.

When attac hing the ductwork to the unit, provide a w atertight 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 25.

Figure 25.

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.

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 sho rtage 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. 18).

 Set the unit onto the curb; check for level.  Ensure unit-to-curb seal is tight and without buckles

or cracks.

 Install and connect proper condensate drain line to

the evaporator condensate pan drain connection (see

Figure 26, p. 26).

OAU-SVX01E-EN 25

Page 26

Installation

PANEL ENCLOSURE

D" NPT FEMALE CONNECTOR

CLEANOUT PLUG

Main Electrical Power Requirements

 Verify that the power supply complies with the unit

nameplate specifications.

 Inspect all control panel components; tighten any

loose connections.

 Connect properly sized and protected power supply

wiring to a field-supplied/-installed disconnect switc h and to the main power terminal block (HTB1) in the unit control panel.

 Connect properly-sized earth ground.

Note: All field-installed wiring must comply with NEC

and applicable local codes.

Condensate Drain Configuration

OAU un its are selected based on dehum id ification capability. As such, condensate can form at a high rate. Therefore, the OAU drain pan and condensate line are sized and designed accordingly. However, an oftenoverlooked element of proper condensate drainage is proper P-Trap and drain line sizing and installation. An incorrectly-designed and -installed P-Trap can restrict condensate flow or cause water in the condensate drain pan to “spit” or “geyser” which may cause condensate overflow. Carefully instal l and trap the drain pan to ensure adequate condensate removal under all conditions.

An evaporator condensate drain connection is provided on each unit. Refer to Figure 28, p. 27, Figure 29, p. 27, and

Figure 30, p. 27 for the appropriate drain location.

A condensate trap must be installed at the unit due to the drain connection being on the “negative pressure” side of the fan. Install the P -Trap using the guidelines in Figure 26.

Pitch drain lines connect ed to P-Trap at least 1/2 inch for every 10 feet of horizontal run to assure proper condensate flow. Do not allow the horizontal run to sag causing a possible double-trap condition which could result in condensate backup due to “air lock”.

Figure 26. Condensate trap installation

D = Pipe diameter; see Figure 28, p. 27, Figure 29, p. 27, and Figure 30, p. 27 for correct pipe diameter H = Internal static pressure (in wg) +1 in. J = H + 0.5 L = H + J +D

Notes:

1. Pitch drain at least 1/2 in. per 10 ft horizontal run.

2. Condensate drain pan will not drain properly if P-trap is not primed

and of adequate height to allow for cabinet operating negative pressure.

Filter Installation

Each unit ships with 2-inch permanent filters (mist eliminators) installed in the air inlet hood. The quantity of filters is determined by unit size. Access to the filters is through the hinged filter access panel on the air intak e hood. In addition to the filters in the intake hood, there is a separate bank of filters accessible through the evaporator coil compartment door. Filter type, size, and quantity are determined by selected filter option and unit size.

Note: Do not operate the unit without filters.

Field Installed Power Wiring

WARNING

26 OAU-SVX01E-EN

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, y ou MUST f ollow r equir ements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

An overall dimensional layout for the standard field installed wiring entrance into the unit is illustrated in

Figure 28, p. 27, Figure 29, p. 27, and Figure 30, p. 27. To

Page 27

Installation

MAIN POWER ENTRANCE FOR UNIT

3/4" NPT

CONDENSATE DRAINELECTRICAL

DISCONNECT

THROUGH BASE ELECTRIC

18.13

54.26

23.37

8.74

3.21

46.58

GAS INLET NPT SIZE VARIES

ELECTRIC

THROUGH BASE

DISCONNECT

ELECTRICAL

1" NPT

CONDENSATE DRAIN

GAS INLET NPT SIZE VARIES

74.04

13.33

54.49

9.09

2.50

18.95

THROUGH THE BASE ELECTRIC

GAS INLET NPT SIZE VARIES

1-1/4" NPT

CONDENSATE DRAIN

ELECTRICAL DISCONNECT

9.76

21.56

104.33

144.00

67.00

17.74

11.78

ensure that the unit’s supply power wiring is properly sized and installed, refer to the following guidelines.

Figure 27. Main power entrance

Figure 28. OA1D utility connections

Figure 29. OA2 utility connections

Table 5. OA2D Unit

MBh Pipe Connection (in.)

150 3/4 200 3/4 250 3/4 300 3/4 350 1 400 1 500 1 600 1-1/4 700 1-1/4 800 1-1/4

Figure 30. OA3 utility connections

Table 4. OA1D Unit

MBh Pipe Connection (in.)

50 1/2 75 1/2 100 1/2 125 1/2 150 3/4 200 3/4 250 3/4 300 3/4 350 1

OAU-SVX01E-EN 27

Page 28

Installation

Table 6. OA3D Unit

MBh Pipe Connection (in.)

300 3/4 350 1 400 1 500 1 600 1-1/4 700 1-1/4 800 1-1/4 1000 1-1/4

Note: All field installed wiring must conform to NEC

guidelines as well as State and Local codes.

V erify that the power supply available is compatible with the unit’s nameplate ratings. The available supply power must be within 10 percent of the rated voltage stamped on the nameplate. Use only copper conductors to connect the power supply to the unit.

Main Unit Power

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing . Follow proper lock out/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Standard Wiring

1 . Location of the applicable electrical service entrance is

illustrated in Figure 28, p. 27, Figure 29, p. 27, and

Figure 30, p. 27. Complete the unit’s power wiring

connections onto either; the main terminal block HTB1 inside the unit control panel, the factory mounted nonfused disconnect switch (UCD) or circuit breaker (UCB), or the electric heat non-fused disconnect switc h. Refer to the customer connection diagram that shipped with the unit for specific termination points.

2. Provide proper grounding for the unit in accordance with local and national codes.

Use the following checklist in conjunction with the checklist in “General Unit Requirements,” p. 25 to ensure that the unit is properly installed and ready for operation.

 Verify that the correct siz e and number of filters are in

place.

 Inspect the interior of the unit for tools and debris and

install all panels in preparation for starting the unit.

 Check all electrical connections for tightness and

“point of termination” accuracy.

 Verify condenser airflow is unobstructed.  Verify that the condenser and indoor fans turn freely

without rubbing and are properly tightened on the shafts.

 Check motor mounting bolts and inlet cone for

tightness. Free spin wheel by hand to c heck for proper alignment of motor, wheel, and inlet cone. Record motor nameplate amps at unit-rated voltage.

 Check proper indoor fan wheel rotation. Wheel

housing will be marked to indicate direction of proper rotation.

 With access door s closed and se cured, operate

blower at 100 percent speed. Check amp readout of amps output to indoor fan at VFD display to confirm operation within motor amp capacity.

Voltage Imbalance

WARNING

Proper Field Wiring and Grounding Required!

The electrical service must be protected from over current and short circuit conditions in accordance with NEC requirements. Protection devices must be siz ed according to the electrical data on the nameplate.

28 OAU-SVX01E-EN

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this p roduct, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

Three phase electrical power to the unit must meet stringent requirements for the unit to operate properly. Measure each leg (phase-to-phase) of the power supply. Each reading must fal l within the utilization range stamped on the unit nameplate. If any of the readings do not fall

Page 29

Installation

within the proper tolerances, notify the power company to correct this situation before operating the unit.

Excessive three phase voltage imbalance between phases will cause motors to overheat and eventually fail. The maximum allowable voltage imbalance is 2.0 percent. Measure and record the volta ge between phases 1, 2, and 3 and calculate the amount of imbalance as follows:

% Voltage Imbalance = 100 X

AV (Average Voltage) =

V1, V2, V3 = Line Voltage Readings VD = Line Voltage reading that deviates the far thest f rom

the average voltage. Example: If the voltage readings of the supply power

measured 221, 230, and 227, the average volts would be:

221 + 230 + 227

VD (reading farthest from average) = 221 The percentage of Imbalance equals:

= 226 Avg.

AV - VD

Vo lt 1 + Volt 2 + Volt 3

where;

Proper electrical supply phasing can be quickly determined and corrected before star ting the unit by using an instrument such as an Associated Research Model 45 Phase Sequence Indicator and following these steps:

 Turn off the main source feeding power to the unit

field-supplied or factory-installed main disconnect device (switch or circuit breaker).

 Close the unit disconnect device cover, leaving

disconnect switch in the off position, and turn main source power on.

 Observe the ABC and CBA phase indicator lights on

the face of the sequencer. The ABC indicator light will glow if the phase is ABC. If the CBA indicator light glows, turn main source power off and then open the unit main disconnect device cover and reverse any two power wires.

 Restore the main source power and recheck the

phasing. If the phasing is correct, turn main source power off then open the unit main disconnect device cover, remove the phase sequence indicator , reinstall disconnect device cover and, leaving disconnect device in the off position, turn main power source to unit on.

Compressor Crankcase Heaters

100 X

The 2.2 percent imbalance in this example exceeds the maximum allowable imbalance of 2.0 percent. This muc h imbalance between phases can equal as much as a 20 percent current imbalance with a resulting increase in motor winding temperatures that will decrease motor life. If the voltage imbalance is over 2.0 percent, notify the proper agencies to correct the voltage problem before operating this equipment.

226 - 221

226

= 2.2%

Electrical Phasing (Three-Phase Motors)

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this pr odu ct, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

The compressor motor(s) and the supply fan motor are internally connected for the proper rotation when the incoming power supply is phased as A to L1, B to L2, and C to L3.

WARNING

Live Electrical Components!

To prevent injury or death from electrocution, it is the responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

Each compressor shall be equipped with a crankcase heater. The proper operation of the crankcase heater is important to maintain an elevated compressor oil temperature during the “Off ” cycle to reduce o il foamin g during compressor starts. Oil foaming occurs when refrigerant condenses in the compressor and mixes with the oil. In lower ambient conditions, refrigerant migration to the compressor could increase.

When the compressor starts, the sudden reduction in crankcase pressure causes the liquid refrigerant to boil rapidly causing the oil to foam. This condition could damage compressor bearings due to reduced lubrication and could cause compressor mechanical failures.

OAU-SVX01E-EN 29

Page 30

Installation

Before initial start up, or if main power has been off for an extended period of time, compressor crankcase heater(s) should be operated for a minimum of 8 hours prior to compressor operation. With main power OFF, remove jumper between OAUTS terminals 9 and 1 0 (E-Stop). T urn main power to energize crankcase heater(s). At end of warm up period turn main power off, install 9-10 jumper, turn main power on, and resume normal operation.

Following crankcase heater warm-up, turn main power disconnect off, and install jumper on E-Stop terminals 9 and 10.

Turn Main disconnect “On”.

Main Unit Display and ReliaTel Controls

When first powered “On”, the controls perform selfdiagnostic initialization to check that all internal controls are functional. The Status LED located on the Main Unit Display and the Liteport LED located on the RTRM module is turned “On” within one second of power-up if in tern al operation is okay.

Field-Installed Control Wiring

WARNING

Proper Field Wiring and Grounding Required!

An overall layout of the var ious c ont rol opti ons avai lable with the required number of conductors for each cont ro l device is illustrated in Figure 31, p. 31 and Figure 32, p. 32.

Note: All field wiring must conform to NEC guidelines as

well as state and local codes.

Control Power Transformer

WARNING

Hazardous Voltage!

The transformers are located in the control panel. The circuit breaker is located on the left side of the transformers and can be reset by pressing in on the blac k reset button.

Controls Using 24 Vac

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the pow er can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Before installing any connecting wiring, refer to Figure 28,

p. 27, Figure 29, p. 27, and Figure 30, p. 27 for the electrical

access locations provided on the unit and Table 7 for AC conductor sizing guidelines, and:

1. Use copper conductors unless otherwise specified.

2. Ensure that the AC control wiring between the controls and the unit’ s termination point does not exceed three (3) ohms/ conductor for the length of the run.

Note: Resistance in excess of 3 ohms per conductor

may cause component failure due to insufficient AC voltage supply.

3. Be sure to check all loads an d conductors for grounds, shorts, and mis-wiring.

4. Do not run the AC low-voltage wiring in the same conduit with the high-voltage power wiring.

Table 7. 24 Vac conductors

Distance from Unit to Control Recommended Wire Size

000–460 feet

000–140 m

461–732 feet

104–223 m

18 gauge

0.75 mm 16 gauge

1 mm

The 24-volt control power transformers are to be used only with the accessories called out in this manual. T ransformers rated greater than 50 VA are equipped with internal circuit breakers. If a circuit breaker trips, turn “Off” all power to the unit before attempting to reset it.

30 OAU-SVX01E-EN

Page 31

Installation

Controls Using DC Analog Input/Output (Standard Low Voltage Multiconductor Wire)

WARNING

Hazardous Voltage!

Before installing any connecting wiring between the unit and components utilizing a DC an alog input\output signal, refer to Figure 28, p. 27, Figure 29, p. 27, and Figure 30,

p. 27 for the electrical access locations provided on the

unit.

1. Table 8, p. 31 lists the conductor sizing guidelines that must be followed when interconnecting the DC binary output devices and the system components utilizing a DC analog input\output signal to the unit.

Note: Resistance in excess of 2.5 ohms per conductor

can cause deviations in the accuracy of the controls.

Figure 31. OAUTS Connection B

2. Ensure that the wiring between controls and the unit’ s termination point does not exceed 2.5 ohms/ conductor for the length of the run.

3. Do not run the electrical wires transporting DC signals in or around conduit housing high voltage wires.

DC Conductors

Table 8. Zone sensor module wiring

Distance from Unit to Control Recommended Wire Size

000–150 feet

0–45.7 m

151–240 feet

46–73.1 m

241–385 feet

73.5–117.3 m 386–610 feet

117.7–185.9 m 611–970 feet

186.2–295.7 m

22 gauge

0.33 mm 20 gauge

0.50 mm 18 gauge

0.75 mm 16 gauge

1.3 mm

14 gauge

2.0 mm

OAU-SVX01E-EN 31

Page 32

Installation

Figure 32. OAUTS Connection C

32 OAU-SVX01E-EN

Page 33

System Configuration and Pre-Start

The following procedure must be completed prior to performing the start-up procedure in the system Start-Up section in this document. This section describes procedures to navigate the various displays on the Unit Display and configure the Outdoor Air Unit Main Unit Display system setpoints and operating parameters.

Important: This section is intended to provide

guidelines for navigation through the remote operator display screens. For additional control system information, refer

to Integration Guide: Tracer™ UC600

Programmable Controller for Packaged Outdoor Air Unit (BAS-SVP18A-EN, or the

most recent revision). The unit is configured at the factory with the default settings as described in “Sequence of Operation—

”Unoccupied”,” p . 2 4; also refer to “Sequence of Operation,” p. 21 for details

concerning setup and operating setpoints.

OAU-SVX01E-EN 33

Page 34

System Configuration and Pre-Start

Table 9. Menu descriptions

Screen Menu Point List Min/Inactive Default Max/Active

Alarms

Reports (continued on next page)

Active Alarms List of all active alarms All Alarms List of all previous alarms Custom Graphics *NOT USED*

Program Control Discharge Air Control Space ControlSpace ControlY Heat Cool Mode Active Heat --- Cool N Occupancy Status Occupied|Unoccupied|Occupied Bypass|Occupied Standby|Unknown Y Compressor 1 Command Off --- On N Compressor 2 Command Off --- On N Compressor 3 Command Off --- On N Compressor 4 Command Off --- On N Digital Scroll Command 0% --- 100% N Dehumidification Command Disabled Enabled N Discharge Air Temperature Local Analog Input Economizer Mode Disabled Enabled N Evap Leaving Temp Local Analog Input Heat Capacity 0% --- 100% N Heating Output Command 0% --- 100% N Heat 1 Command Off --- On N Heat 2 Command Off --- On N Heat 3 Command Off --- On N Inducer Command Off --- On N Gas Valve Status Binary Input HGRH Command 0% --- 100% N OA Damper End Switch Binary Input

System Status

Outdoor Air Damper Command Closed --- Open N OAD Position Local Binary Input Outdoor Air Relative Humidity Local Analog Input Outdoor Air Temperature Local Analog Input Space Dewpoint Active Analog Input Space Temperature Local Analog Input Supply Fan Start Stop Command Off --- Off N Filter Status Clean --- Dirty N System Lockout Normal Normal Lockout N UNOCC Cooling Mode Off --- On N UNOCC Dehumid Mode Off --- On N UNOCC Heating Mode Off --- On N ERV Command Disable --- Enable N ERV Leaving Air Temperature Local Analog Input PEVFD Command 0% 80% 100% Y Discharge Airflow Local Analog Input ERV Leaving Air Humidity Local Analog Input

BAS Point?

34 OAU-SVX01E-EN

Page 35

System Configuration and Pre-Start

Table 9. Menu descriptions (continued)

Screen Menu Point List Min/Inactive Default Max/Active

DAT High Temp Cutout 100°F 125°F 150°F Y DAT Low Temp Cutout 35°F 35°F 50°F Y DAT Temp Cutout Time 10 min. 10 min. 25 min. Y Discharge Air Cooling Setpoint 55°F 55°F 75°F Y Discharge Air Heating Setpoint 65°F 85°F 90°F Y ERV Wheel Frost Cutout Setpoint 32°F 34°F 40°F Y EVAP Leaving Temp Setpoint 45°F 53°F 70°F Y IVFD Signal 50% 100% 100% Y Maximum Discharge Air Temperature 70°F 90°F 100°F Y Minimum Discharge Air Cooling Setpoint 40°F 50°F 65°F Y Minimum Discharge Air Heating Setpoint 50°F 55°F 60°F Y

System Setpoints

Reports (continued from previous page)

System Setup

Override Summary List of active overrides - same as selecting Override button at top of screen All Point Report List of all points (AO/AI/BO/BI/MS/etc …) in the configuration file About Controller Name listed is the version of the program installed in the UC600 Expansion Modules Provides status of expansion modules TGP2 Programs List of all TGP2 programs loaded on the UC600

Data Graphs *NOT USED*

Schedules - Refer to UC600 IOM for scheduling functions Display Preferences

Settings

Language Date and Time Clean Touchscreen

Maximum OA Damper Position 0% 100% 100% Y Minimum OA Damper Position 0% 100% 100% Y Occupied Space Cooling Setpoint 65°F 74°F 90°F Y Occupied Space Heating Setpoint 60°F 70°F 75°F Y Outdoor Air Cooling Setpoint (OACS) 70°F 75°F 85°F Y Outdoor Air Dewpoint Setpoint (OADS) 49°F 58°F 65°F Y Outdoor Air Heating Setpoint (OAHS) 40°F 70°F 70°F Y PEVFD Setpoint 0% 80% 100% Y Space Dewpoint Setpoint (SPDS) 50°F 59°F 68°F Y UNOCC Space Cooling Setpoint 60°F 80°F 90°F Y UNOCC Space Dewpoint Setpoint 49°F 65°F 68°F Y UNOCC Space Heating Setpoint 50°F 60°F 70°F Y Program Control Discharge Air Control Space ControlSpace ControlY Compressor Count 004N Heater Count 002N Split Manifold Burner Not Installed Installed Installed N ERV Option Not Installed Installed Installed N Powered Exhaust Option Not Installed Installed Installed N Return Air Damper Option Not Installed Installed Installed N Space Temp/Humidity Sensor Installed Not Installed Installed Installed N Heat Type No Heat|Gas Heat|Electric Heat|Other N Alarm Reset Off Off On Y Supply Fan Failure Reset Off Off On Y

BAS Point?

OAU-SVX01E-EN 35

Page 36

Start-Up

Indirect Gas-Fired Heating Start-Up

WARNING

Hazardous Service Procedures!

Do not attempt the following procedures until all electrical and gas connections to the unit have been completed and the outdoor air damper and evaporator fan operation have been verified and are operating correctly.

Failure to follow all of the safety warnings provided could result in death or serious injury.

Notes:

1. This furnace module does not have a pilot. It is equipped with a direct spark ignition device that automatically lights the gas burner . DO NOT try to light burners by hand.

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. It could result in an explosion. Use a leak test solution for leak testing. Failure to follow recommended safe leak test procedures could result in death or serious injury or equipment or property-only-damage.

2. BEFORE OPERATING, leak test all gas piping up to heater gas valve. Smell around the unit area for gas. If gas is smelled, do NOT attempt to place heater in operation until source of gas leak is identified and corrected.

3. Use only hand force to operate the gas control lever to the “ON” position. NEVER use tool s. If l ever do es not operate by hand, replace gas valve prior to staring the unit. Forcing or attempting to repair the gas valve may result in fire or explosion.

4. Do not attempt to operate unit, if there is indication that any part or control has been under water. Any control

or component that has been under water must be replaced prior to trying to start the unit.

Refer to “Sequence of Operation,” p. 21 for additional information.

Tools Required

• Voltage Meter (μA)

•Amp Meter

• Gas Manometer (2)

• Temperature Probe

• Small Refrigeration Screwdriver

• 5/16-in. Nut Driver

• 3/16-in. Allen Wrench

• 3/32-in. Allen Wrench

• 1/8-in. NPT barbed pressure taps (3)

• 1/2-in. Open End Wrench

Start-Up Procedure

1. Check Inlet Gas Pressure

Check to insure the g as pressure supplied to the unit is within the pressure requirement listed on the nameplate. DO NOT expose gas controls to pressures above 1/2 psi (14 in. wc). The gas supply line should be installed with an external manual shutoff and pressure tap.

2. Verify Indoor Fan Failure Switch Operation

Indoor Fan Failure Switch (IFFS) is located in the unit electrical control compartment above the heater. Indoor fan failure switch will fail if not proven within 30 seconds of call for indoor fan—ON.

All unit air filters must be clean before proceeding to properly complete this verification.

Important: If the unit air filters are not clean, unit

performance could be affected. Remove and clean or replace air filters as required prior to proceeding with the burner pressure testing.

In the event that the pressure switch fails to operate, chec k the pic k-up tubes to be certain that the tubes are not obstructed and confirm that the tube connections to IFFS are tight and secure.

36 OAU-SVX01E-EN

Page 37

Start-Up

3. Confirm Gas Flow at Unit

WARNING

Hazardous Voltage and Gas!

Turn off the gas supply and disconnect all electric power, including remote disconnects before servicing unit. Follow proper lockout/tagout procedures to ensure the pow er can not be inadvertently energized and the gas can not be inadvertently turned on. Failure to turn of f gas or disconnect power before servicing could result in death or serious injury.

Open door to unit vestibule housing the gas heater. Move gas control lever to “OFF” position. Remove 1/8-in. pressure taps (see Figure 34, p. 39) from both modulating and on-off sections of the split heater manifold. Install a barbed fittin g in both 1/8-in. tapped holes for connection to individual gas manometers.

Note: There is a third 1/8-in. gas pressure tap located in

the pipe connecting the main valve/regulator and modulating valve. Maximum pressure into modulating valve is 5-in. The On-Off gas valve includes a regulator adjustment device that is located on the top of the valve. Use this device to regulate valve output to modulating valve as required.

Wait 5 minutes for any gas to clear. If you smell gas, see

Step 2 and correct leak. If you don’t smell gas or have

corrected any leaks, go to Step 4.

4. Burner Starting Sequence and Burner Ignition

Figure 34, p. 39 illustrates indirect gas-fired furnace

components.

5. Main Gas Supply

Turn manual gas cock “ON”.

6. Split Manifold High Fire and Burner Test

Open all manual gas valves. Turn power on at unit’s main disconnect switc h. Open gas supply manual shutoff valve. Using unit display (or computer with Trane Tracer TU), proceed to System Status Display and Override all Compressor stages OFF, Disable Dehumidification, Disable Economizer Mode, Disable ERV . If two heaters are installed, test heating with split manifold first by overriding burner 2 OFF. Override heating Output Command to 100.0 percent if one heater is installed and to 49 percent if two heaters are installed. Override Heat Cool Mode Active to Heat. This will enable call for heat to split manifold heater. Depending on outdoor air temperature, at time of startup, heater high limit temperature may be exceeded causing limit switch to trip. Limit switch is auto-reset. Limit switch must be jumpered out of the circuit if OA temperature dictates.

With limit switch closed, the draft inducer will run on high speed for 10 seconds for proof of high and low airflow switch closure, then begin a 30-second prepurge period. At the end of the pre-purge the direct

spark will be energized and On-Off gas valve will open for a 5-second ignition trial. Following successful ignition, the inducer remains on high for 10-second flame stabilization, followed by 30-second warm up. Should the flame go out or the burner fail to light, an ignition retry will initiate following a 15-second interpurge period.

Following successful ignition, manifold pressure should be 1.2 in. wc during the warm-up period. T he manifold pressure will rise to 3.5 in. wc at 100 percent firing rate. Following these sequences to chec k low fire gas pressure for modulating section, reduce Heating Output Command to 0 percent. Inducer speed will reduce to low speed. Correct gas pressure for modulating manifold section of heater at 0 percent output signal or low fire will be 0.17 in. For modulating sections, the outlet gas pressure from main/regulator valve into the modulating valve is 5-in. wc.

Main On-Off valves in 1/2-in. gas line require 3/32-in. Allen wrench to adjust outlet gas pressure. Valves in 3/4-in. gas line requ ire flat blade screwdriver to adjust outlet gas pressure. Following these sequences, inducer speed will reduce to low speed and will now be speed-controlled by the heater controller based on gas input to burners.

With heating command at 100 percent and with a single split manifold heater installed, the On-Off section of the heater will require the modulating section to prove ON before the On-Off section will enable. Inducer speed high at all times the On-Off section is in ignition sequence or firing. On-Of f section sequence includes a 1-second ignition pre-purge followed by 4-second ignition trial. Ignition or flame failure will be followed by 30-second inter-purge for two ignition retry then 5-minute lockout period if both retry attempts fail. Correct manifold gas pressure for On-Off heater section is 3.5 in. wc.

For units including an additional separate On-Off heater, set heat command output to 49 percent to run modulating heater star t-up. When complete with modulating heater star t-up, increase heat output command to 100 percent to start up the second heater.

Failure to Ignite

• On the initial start-up, or after unit has been off l ong

periods of time, the first ignition trial may be unsuccessful due to need to purge air from manifold at start-up.

• If ignition does not occur on the first trial, the gas and spark are shut-off by the ignition control and the control enters an inter-purge period of 15 seconds, during which the draft inducer continues to run.

• At the end of the inter-pu rge period, another trial for ignition will be initiated.

• Control will initiate up to three ignition trials on a call for heat before lockout of control occurs.

OAU-SVX01E-EN 37

Page 38

Start-Up

Burner flame at start-up: 1.2 in. wc manifold pressure draft inducer—high speed

Burner flame at high fire: 3.5 in. wc manifold pressure draft inducer—high speed

• Control can be brought out of lockout by cycling call for heat at the Main Unit Display.

Prior to completing the start-up, c hec k the appearance of the main burner flame. Refer to Figure 33, p. 38 for flame characteristics of properly adjusted natural gas systems.

Figure 33. Flame characteristics of properly-adjusted

natural gas systems

• Poor air supply can be caused by obstructions or blockage in heat exc hanger tubes or vent disc harge pipe. Inspect and clean as necessary to eliminate blockage. Vacuum any dirt or loose debris. Clean heat exchanger tubes with stiff brush. Poor flame characteristics can also be caused by flue gas recirculation into combustion air supply. If surrounding buildings or prevailing winds cause recirculation, a flue extension may be required to prevent recirculation. Contact manufacturer prior to making any flue adjustments.

• Reduced air delivery can also be the result of inducer fan blade slippage, dirt accumulation in the fan blade or low voltage to draft inducer motor. Inspect draft fan assembly and be sure fan blade is secure to motor shaft. Check line v o ltage to heater.

7. Flame Sensor Current Check

NOTICE:

Meter Damage!

Do NOT measure voltage with meter connected to a circuit. Failure to follow these instructions could result in meter damage.

Flame current is the curren t whic h passes through the flame from the sensor to ground. A flame signal of 0.5 to 1.0 microamp (μA) is marginal. For dependable operation, a flame signal of greater than 1.0 μA is required. To measure flame current, connect a meter capable of reading micro-amp current so the flame signal will be read thru the meter’s COM and μA connections. The meter should read greater than

1.0 μA.

Note: If the meter reads below “0” on scale, meter

leads are reversed; disconnect power and reconnect meter leads for proper polarity.

Main burner flame

• The burner flame should be predominately blue in

color and well defined and centered at the tube entry as shown in Figure 33 above. Distorted flame or yellow tipping of natural gas flame, or a long yellow flame on propane, may be caused by lint and dirt accumulation inside burner or at burner por ts, at air inlet between burner and manifold pip e, or debris in the main burner orifice. Soft brush or vacuum clean affected areas.

• Poorly defined, substantially yellow flames, or flames that appear lazy, indicate poor air supply to burners or excessive burner input. Verify gas supply type and manifold pressure with rating plate.

38 OAU-SVX01E-EN

Page 39

Figure 34. OA1/OA2/OA3 indire ct gas-fired furnace components

INDUCER MOTOR

INLET PRESSURE TAP

IGNITION

ON/OFF GAS VALVE

MANIFOLD GAS

PRESSURE = 14" W.C.

AIR-PROVING

PRESSURE TAP

SWITCH

MAXIMUM INLET

PRESSURE TAP

MANIFOLD GAS

ROLLOUT SWITCH

CONTROLLERS

MAXIMUM INLET PRESSURE = 14" W.C.

CONDENSATE DRAIN (TYP. 2)

INDUCER BLOWER

MODULATING VALVE

FLAME SENSOR

HIGH LIMIT SWITCH

ROLLOUT SWITCH

MODULATING GAS VALVE

Start-Up

Safety Controls

Air Pressure Switch. An air pressure switch is provided

as part of the control system to verify airflow through draft inducer by monitoring the difference in pressure between the draft inducer and the atmosphere. If sufficient negative pressure is not present, indicating lack of proper air movement through heat exchanger, the switch opens shutting off gas supply though the ignition control module. On units with two speed draft inducer operation, a dual air pressure switch is used, m onitoring high and low speed pressures. The air pressure switches have fixed settings and are not adjustable.

Rollout Switch (Manual Reset). The furnace module

is equipped with manual reset rollout switch(es) in the event of burner flame rollout. The switch will open on temperature rise and shut-off gas supply through the ignition control module. Flame rollout can be caused by insufficient airflow for the burner firing rate (high gas pressure), blockage of the vent system or in the heat exchanger . The furnace module should not be placed back in operation until the cause of rollout condition is identified and corrected. The rollout switch can be reset by pressing the button on top of the switch.

High Limit Switch. The furnace module is equipped

with a fixed temperature high limit switch mounted on the vestibule panel that shuts off gas to the heater through the ignition control module in the event of reduced airflow over the heat exchanger tubes. Reduced airflow can be caused by indoor fan failure, dirty or blocked filters, or restriction of the air inlet or outlet to the unit. The high lim it switch will automatically reset when the air temperature drops to approximately 30°F below the limit setpoint. Determine the cause of the reduced air flow and correct.

OAU-SVX01E-EN 39

Page 40

Maintenance

Make sure all personnel are standing clear of the unit before proceeding. The system components will star t when the power is applied.

Monthly Maintenance

Before completing the following chec ks, turn the unit OFF and lock the main power disconnect switch open.

WARNING

Hazardous Voltage!

Filters

• Inspect the return air filters. Clean or replace them if necessary. Refer to the unit Service Facts for filter information and refer to “OAU Filter Guide” in

“Appendix,” p. 55 for exact replacement dimensions.

Supply/Return Air Smoke Detector Maintenance

Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters.

To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter c hanges, and coil cleaning is required.

Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly.

For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature pac kage for this unit.

Cooling Season

• Check the unit’s drain pans and condensate piping to ensure that there are no blockages.

• Inspect the evaporator and condense r coils for dirt, bent fins, etc. If the coils appear dirty, clean them according to the instructions described in “Condenser

Coil Cleaning,” p. 40.

• Manually rotate the condenser fan(s) to ensure free movement and check motor bearings for wear. Verify that all of the fan mounting hardware is tight.

• Inspect the F/A-R/A damper hinges and pins to ensure that all moving parts are securely mounted. Keep the blades clean as necessary.

• Verify that all damper linkages move freely; lubricate with white grease, if necessary.

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Check the fan shaft bearings for wear. Replace the bearings as necessary.

• Verify that all wire terminal connections are tight.

• Remove any corrosion present on the exterior surfaces of the unit and repaint these areas.

• Generally inspect the unit for unusual conditions (e.g., loose access panels, leaking piping connections, etc.).

• Make sure that all retaining screws are reinstalled in the unit access panels once these chec ks are complete.

• With the unit running, c h eck and record the: ambient temperature; compressor suction and discharge pressures (each circuit); superheat (each circuit); Record this data on an “operator’s maintenance log” like the one shown in Table 10, p. 41. If the operating pressures indicate a refrigerant shortage, measure the system superheat.

Note: Do NOT release refrigerant to the atmosphere! If

adding or removing refrigerant is required, the service technician must comply with all federal, state and local laws.

Heating Season

• Inspect the unit’s air filters. If necessary, clean or replace them.

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Inspect both the main unit control panel and hea t section control box for loose electrical components and terminal connections, as well as damaged wire insulation. Make any necessary repairs.

• Verify that the electric heat system operates properly.

Condenser Coil Cleaning

Regular coil maintenance, including annual cleaning, enhances the unit’s operating efficiency by minimizing: compressor head pressure and amperage draw; evaporator water carryover; fan brake horsepower, due to increase static pressure losses; airflow reduction.

At least once each year , or more often if the unit is located in a “dirty” environment, clean the condenser coils using the instructions outlined below. Be sure to follow these instructions as closely as possible to avoid damaging the coils.

40 OAU-SVX01E-EN

Page 41

Maintenance

Microchannel (MCHE) Coils

NOTICE:

Coil Damage!

DO NOT use any detergents with microchannel condenser coils. Use pressurized water or air ONLY, with pressure no greater than 600psi. Failure to do so could result in coil damage.

For additional information regarding the proper microchannel coil cleaning procedure, refer to RT-SVB83*-EN.

Due to the soft material and thin wall s of the MC HE coils, the traditional field maintenance method recommended for Round Tube Plate Fin (RTPF) coils does not apply to microchannel coils.

Moreover, c hemical cleaners are a risk factor to MCHE due to the material of the coil. The manufacturer does not recommend the use of chemical cleaners to clean microchannel coils. Using c hemical cleaners could lead to warranty claims being further evaluated for validity and failure analysis.

The recommended cleaning method for microcha nn el condenser coils is pressurized water or air with a nonpinpoint nozzle and an ECU of at least 180 with pressure no greater than 600 psi. To minimize the risk of coil damage, approach the cleaning of the coil with the pressure washer aimed perpendicular to the face of the coil during cleaning. Optimum clearance between the sprayer nozzle and the microchannel coil is 1 in.–3 in.

Table 10. Sample maintenance log

Refrigerant Circuit #1 Refrigerant Circuit #2

Suct.

Press.

Psig/kPa

Disch. Press

Psig/kPa

Liquid

Press

Psig/kPa

Super-

heat F/C

Date

Current

Ambient

Temp F/C

Compr.

Oil Level

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

Final Process

For future reference, you may find it helpful to record the unit data requested below in the blanks provided.

(1) Complete Unit Model Number: _____________________________________________________ _____________________________________________________ _____________________________________________________ (2) Unit Serial Number: _____________________________________________________ _____________________________________________________ _____________________________________________________ (3) Wiring Diagram Numbers (from unit control panel) — schematic(s) _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ — connection(s) _____________________________________________________ _____________________________________________________ _____________________________________________________

Sub-cool

F/C

Compr.

Oil Level

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

Suct.

Press.

Psig/kPa

Disch.

Press

Psig/kPa

Liquid

Press

Psig/kPa

Super-

heat F/C

Sub-cool

F/C

OAU-SVX01E-EN 41

Page 42

Performance Data

Table 11. OA1 General Data—Cooling 5–8 Tons High Efficiency

5 Tons Downflow 6 Tons Downflow 7 Tons Downflow 8 Tons Downflow

OA1D060A OA1D072A OA1D084 OA1D096

Cooling Performance

Gross Cooling Capacity, Btu (kW) 61,464 (18.01) 73,757 (21.62) 86,050 (25.22) 98,342 (28.82) Nominal cfm (m

Compressor

Number 1112 Type Scroll Scroll Scroll Scroll

Outdoor Coil

Type High Performance High Performance High Performance High Performance Tube Size—OD, in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) Face Area, ft Rows 2222 FPI 12121212

Indoor Coil

Type High Performance High Performance High Performance High Performance Tube Size—OD, in. (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) Face Area, ft Rows 6666 FPI 12121212 Refrigerant Control TXV TXV TXV TXV Drain Connection Size, in. (mm) 3/4 (20) 3/4 (20) 3/4 (20) 3/4 (20)

Outdoor Fan

Type Propeller Propeller Propeller Propeller Number Used 1112 Diameter, in. (mm) 24 (609.6) 24 (609.6) 24 (609.6) 24 (609.6) Drive Type Direct Direct Direct Direct No. Speeds 1111

CFM (m Number Motors 1112 Motor HP (kW), per motor 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) Motor RPM 1140 1140 1140 1140

Indoor Fan

Type Backward Inclined Backward Inclined Backward Inclined Backward Inclined Number Used 1111 Diameter Varies Varies Varies Varies Drive Type Direct Drive Direct Drive Direct Drive Direct Drive Number Motors 1111 Motor HP (kW), Standard–Oversized 1.0–3.0 (0.75–2.24) 1.0–3.0 (0.75–2.24) 1.0–3.0 (0.75–2.24) 1.0–5.0 (0.75–3.73) Motor RPM, Standard–Oversized 1750–3500 1750–3500 1750–3500 1750–3500 Motor Frame Size, Standard–Oversized Varies Varies Varies Varies

Filters

Type Furnished Refer to “OAU Filter Number Size Recommended

Refrigerant Charge, lb of R-410A

Downflow See Nameplate See Nameplate See Nameplate See Nam eplate

/h) 625–1250 (1062–2124) 750–1500 (1274–2549) 875–1750 (1487–2973) 1000–2000 (1699–3398)

(m2) 13 (1.21) 13 (1.21) 13 (1.21) 24 (2.23)

(m2) 6 (0.56) 6 (0.56) 6 (0.56) 9 (0.84)

/h) 6,500 (11,044) 6,500 (11,044) 6,500 (11,044) 13,000 (22,087)

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

42 OAU-SVX01E-EN

Page 43

Performance Data

Table 12. OA1 General Data—Cooling 10–15 Tons High Efficiency

10 Tons Downflow 12 Tons Downflow 15 Tons Downflow

OA1D120A OA1D144A OA1D144A

Cooling Performance

Gross Cooling Capacity, Btu (kW) 121,904 (35.73) 147,514 (43.23) 184,392 (54.04) Nominal cfm (m

Compressor

Number 2 2 2 Type Scroll Scroll Scroll

Outdoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) Face Area, ft Rows 2 2 2 FPI 121212

Indoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) Face Area, ft Rows 6 6 6 FPI 121212 Refrigerant Control TXV TXV TXV Drain Connection Size, in. (mm) 3/4 (20) 3/4 (20) 3/4 (20)

Outdoor Fan

Type Propeller Propeller Propeller Number Used 2 2 2 Diameter, in. (mm) 24 24 24 Drive Type Direct Direct Direct No. Speeds 1 1 1

CFM (m Number Motors 2 2 2 Motor HP (kW), per motor 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) Motor RPM 1140 1140 1140

Indoor Fan

Type Backward Inclined Backward Inclined Backward Inclined Number Used 1 1 1 Diameter Varies Varies Varies Drive Type Direct Drive Direct Drive Direct Drive Number Motors 1 1 1 Motor HP (kW), Standard–Oversized 1.0–5.0 (0.75–3.73) 1.0–5.0 (0.75–3.73) 1.0–5.0 (0.75–3.73) Motor RPM, Standard–Oversized 1750–3500 1750–3500 1750–3500 Motor Frame Size, Standard–Oversized Varies Varies Varies

Filters

Type Furnished Refer to “OAU Filter Number Size Recommended

Refrigerant Charge, lb of R-410A

Downflow See Nameplate See Nameplate See N a meplate

/h) 1250–2500 (2124–4248) 1500–3000 (2549–5097) 1875–3750 (3186–6371)

(m2) 24 (2.23) 24 (2.23) 24 (2.23)

(m2) 9 (0.84) 9 (0.84) 9 (0.84)

/h) 13,500 (22,937) 13,500 (22,937) 13,500 (22,937)

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

OAU-SVX01E-EN 43

Page 44

Performance Data

Table 13. OA2 General Data—Cooling 12–20 Tons High Efficiency

12 Tons Downflow 15 Tons Downflow 17 Tons Downflow 20 Tons Downflow

OA2D144A OA2D180A OA2D210A OA2D240A

Cooling Performance

Gross Cooling Capacity, Btu (kW) 147,514 (43.23) 184,392 (54.04) 208,973 (61.24) 245,856 (72.05) Nominal cfm (m

Compressor

Number 2222 Type Scroll Scroll Scroll Scroll

Outdoor Coil

Type High Performance High Performance High Performance High Performance Tube Size—OD, in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) Face Area, ft Rows 2333 FPI 12121212

Indoor Coil

Outdoor Fan

Type Propeller Propeller Propeller Propeller Number Used 2333 Diameter, in. (mm) 24 (609.6) 24 (609.6) 24 (609.6) 24 (609.6) Drive Type Direct Direct Direct Direct No. Speeds 1111

CFM (m Number Motors 3333 Motor HP (kW), per motor 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) Motor RPM 1140 1140 1140 1140

Indoor Fan

Type Backward Inclined Backward Inclined Backward Inclined Backward Inclined Number Used 1111 Diameter Varies Varies Varies Varies Drive Type Direct Drive Direct Drive Direct Drive Direct Drive Number Motors 1111 Motor HP (kW), Standard–Oversized 1.0–5.0 (0.75–3.73) 1.0–5.0 (0.75–3.73) 1.0–7.5 (0.75–5.6) 1.0–7.5 (0.75–5.6) Motor RPM, Standard–Oversized 1750–3500 1750–3500 1750–3500 1750–3500 Motor Frame Size, Standard–Oversized Varies Varies Varies Varies

Filters

Type Furnished Refer to “OAU Filter Number Size Recommended

Refrigerant Charge, lb of R-410A

Downflow See Nameplate See Nameplate See Nameplate See Nameplate

/h) 1500–3000 (2549–5097) 1875–3750 (3186–6371) 2125–4250 (3610–7221) 2500–5000 (4248–8495)

(m2) 24 (2.23) 30 (2.79) 38 (3.53) 38 (3.53)

(m2) 9 (0.84) 10 (0.93) 15 (1.39) 15 (1.39)

/h) 19,500 (33,131) 19,500 (33,131) 19,500 (33,131) 19,500 (33,131)

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

Refer to “OAU Filter

Guide” in “Appendix,”

p. 55

44 OAU-SVX01E-EN

Page 45

Table 14. OA2 General Data—Cooling 22–30 Tons High Efficiency

22 Tons Downflow 25 Tons Downflow 30 Tons Downflow

OA2D264A OA2D300A OA2D360A

Cooling Performance

Gross Cooling Capacity, Btu (kW) 270,442 (79.26) 307,320 (90.07) 368,784 (108.08) Nominal cfm (m

/h)

2750–5500

(4692–9345)

Compressor

Number 2 2 2 Type Scroll Scroll Scroll

Outdoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) Face Area, ft Rows 3 3 3 FPI 12 12 12

(m2) 38 (3.53) 38 (3.53) 38 (3.53)

Indoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) Face Area, ft Rows 6 6 6 FPI 12 12 12 Refrigerant Control TXV TXV TXV Drain Connection Size, in. (mm) 1 (25) 1 (25) 1 (25)

(m2) 15 (1.39) 20 (1.86) 20 (1.86)

Outdoor Fan

Type Propeller Propeller Propeller Number Used 3 3 3 Diameter, in. (mm) 24 (609.6) 24 (609.6) 24 (609.6) Drive Type Direct Direct Direct No. Speeds 1 1 1

CFM (m Number Motors 3 Motor HP (kW), per motor 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) Motor RPM 1140 1140 1140

/h) 19,500 (33,131) 19,500 (33,131) 19,500 (33,131)

Indoor Fan

Type Backward Inclined Backward Inclined Backward Inclined Number Used 1 1 1 Diameter Varies Varies Varies Drive Type Direct Drive Direct Drive Direct Drive Number Motors 1 1 1 Motor HP (kW), Standard–Oversized 1.0–7.5 (0.75–5.6) 1.0–15.0 (0.75–11.19) 1.0–15.0 (0.75–11.19) Motor RPM, Standard–Oversized 1750–3500 1750–3500 1750–3500 Motor Frame Size, Standard–Oversized Varies Varies Varies

Filters

Type Furnished Number Size Recommended

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

Refrigerant Charge, lb of R-410A

Downflow See Nameplate See Nameplate See Nameplate

3125–6250

(5309–10619)

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

3750–7500

(6371–12743)

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

Performance Data

OAU-SVX01E-EN 45

Page 46

Performance Data

Table 15. OA3 General Data—Cooling 30–40 Tons High Efficiency

30 Tons Downflow 35 Tons Downflow 40 Tons Downflow

OA3D360A OA3D420A OA3D480A

Cooling Performance

Gross Cooling Capacity, Btu (kW) 368,784 (108.08) 430,248 (126.09) 491,712 (144.11) Nominal cfm (m

/h)

3750–7500

(6371–12743)

Compressor

Number 233 Type Scroll Scroll Scroll

Outdoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) Face Area, ft Rows 233 FPI 121212

(m2) 48 (4.46) 53 (4.92) 63 (5.85)

Indoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) Face Area, ft Rows 666 FPI 121212 Refrigerant Control TXV TXV TXV Drain Connection Size, in. (mm) 1-1/4 (32) 1-1/4 (32) 1-1/4 (32)

(m2) 23 (2.14) 23 (2.14) 29 (2.69)

Outdoor Fan

Type Propeller Propeller Propeller Number Used 4 4 4 Diameter, in. (mm) 24 24 24 Drive Type Direct Drive Direct Drive Direct Drive No. Speeds 111

CFM (m Number Motors 444 Motor HP (kW), per motor 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) Motor RPM 1140 1140 1140

/h) 26,000 (44,174) 26,000 (44,174) 26,000 (44,174)

Indoor Fan

Type Backward Inclined Backward Inclined Backward Inclined Number Used 1 1 1 or 2 Diameter Varies Varies Varies Drive Type Direct Drive Direct Drive Direct Drive Number Motors 1 1 1 or 2 Motor HP (kW), Standard–Oversized 1.5–15 (1.12–11.19) 1.5–15 (1.12–11.19) 2.0–15 (1.49–11.19) Motor RPM, Standard–Oversized 1750–3500 1750–3500 1750–3500 Motor Frame Size, Standard–Oversized Varies Varies Varies

Filters

Type Furnished Number Size Recommended

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

Refrigerant Charge, lb of R-410A

Downflow See Nameplate See Nameplate See Nameplate

4375–8750

(7433–14866)

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

5000–10000

(8495–16990)

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

46 OAU-SVX01E-EN

Page 47

Performance Data

Table 16. OA3 General Data—Cooling 45–54 Tons High Efficiency

45 Tons Downflow 50 Tons Downflow 54 Tons Downflow

OA3D540A OA3D600A OA3D648A

Cooling Performance

Gross Cooling Capacity, Btu (kW) 553,176 (162.12) 614,640 (180.13) 663,811 (194.54) Nominal cfm (m

/h)

5625–11250

(9557–19114)

Compressor

Number 344 Type Scroll Scroll Scroll

Outdoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) Face Area, ft Rows 444 FPI 121212

(m2) 63 (5.85 63 (5.85 63 (5.85

Indoor Coil

Type High Performance High Performance High Performance Tube Size—OD, in. (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) Face Area, ft Rows 666 FPI 121212 Refrigerant Control TXV TXV TXV Drain Connection Size, in. (mm) 1-1/4 (32) 1-1/4 (32) 1-1/4 (32)

(m2) 29 (2.69) 29 (2.69) 29 (2.69)

Outdoor Fan

Type Propeller Propeller Propeller Number Used 4 4 4 Diameter, in. (mm) 24 (609.6) 24 (609.6) 24 (609.6) Drive Type Direct Direct Direct No. Speeds 111

CFM (m Number Motors 444 Motor HP (kW), per motor 1.0 (0.75) 1.0 (0.75) 1.0 (0.75) Motor RPM 1140 1140 1140

/h) 26,000 (44,174) 26,000 (44,174) 26,000 (44,174)

Indoor Fan

Type Backward Inclined Backward Inclined Backward Inclined Number Used 1 or 2 1 or 2 1 or 2 Diameter Varies Varies Varies Drive Type Direct Drive Direct Drive Direct Drive Number Motors 1 or 2 1 or 2 1 or 2 Motor HP (kW), Standard–Oversized 2.0–15 (1.49–11.19) 3.0–15 (2.24–11.19) 3.0–15 (2.24–11.19) Motor RPM, Standard–Oversized 1750–3500 1750–3500 1750–3500 Motor Frame Size, Standard–Oversized Varies Varies Varies

Filters

Type Furnished Number Size Recommended

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

Refrigerant Charge, lb of R-410A

Downflow See Nameplate See Nameplate See Nameplate

6250–12500

(10619–21238)

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

6750–13500

(11468–22937)

Refer to “OAU Filter Guide”

in “Appendix,” p. 55

OAU-SVX01E-EN 47

Page 48

Performance Data

Superheat and Refrigeration Circuit Data

Figure 35. Refrigeration diagram: Single compressor

without reheat

Figure 36. Refrigeration diagram: Single compressor

with reheat

48 OAU-SVX01E-EN

Page 49

Performance Data

Figure 37. Refrigeration diagram: dual compressor no

reheat

Figure 38. Refrigeration diagr am: dual compressor with

reheat

OAU-SVX01E-EN 49

Page 50

Performance Data

Figure 39. Refrigeration diagram: triple compressor

with no reheat

Figure 40. Refrigeration diagram: triple compressor

with reheat

50 OAU-SVX01E-EN

Page 51

Figure 41. Refrigeration diagram: quad compressor

with no reheat

Performance Data

Figure 42. Refrigeration diagram: quad compressor

with reheat

OAU-SVX01E-EN 51

Page 52

Alarms and Troubleshooting

Microprocessor Control

The Main Unit Display and RTRM have the ability to provide the service personnel with some unit diagnostics and system status information.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electr ical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electr ical components, hav e a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks. Failure to follow all of the safety warnings provided could result in death or serious injury.

1. Verify that the Liteport LED on the RTRM is burning continuously. If the LED is lit, go to Step 3.

2. If the LED is not lit, verify that 24 Vac is presence between J1-1 and J1-2. If 24 Vac is present, proceed to

Step 3. If 24 Vac is not present, check the unit main

power supply, check transformer (TNS1). Proceed to

Step 3 if necessary.

3. Utilizing “Method 1” in the RTRM “System Status Checkout Procedure”, check the following:

• System status

• Cooling status

If a System failure is indicated, proceed to Step 4. If no failures are indicated, proceed to Step 5.

4. If a System failure is indicated, recheck Step 1 and Step

2. If the LED is not lit in Step 1, and 24 Vac is present in Step 2, the RTRM has failed. Replace the RTRM.

5. If no failures are indicated, use one of the override options to start the unit. Following the Override procedure will allow you to check all of the operating modes, and all of the external controls (relays, contactors, etc.) for each respective mode.

6. Refer to the sequence of operations for each mode, to assist in verifying proper operation. Make the necessary repairs and proceed to Step 7.

7. If no abnormal operating conditions appear in the Override mode, release the override and turn the power “Off” at the main power disconnect switch.

System Alarms

The Main Unit Display has built in alarms to help the operator troubleshoot system failures. This section will describe these alarms and provide a guide to troubleshooting the all unit operating modes.

Comprehensive system alarms and diagnostics are accessed through the Alarms icon at the unit display discussed later in the section, or through Tracer TU programming on connected computer. Sensor failures may be viewed through the Alarms icon.

If an alarm is present, the main indicator light on the UC600 will blink red. If the optional unit display is installed, the Alarm icon on the display will register ALARM, illuminate red and flash.

Important: The space temperature sensor (SPTC) and

space relative humidity sensor (SPHC) will read failed if they are not connected; they will Alarm as “In Fault.”

Sensor Failure Alarm Display

Press the Alarm button on the Home display of the Unit Display to display system sensor status as described in

Table 17 and Table 18, p. 53.

Table 17. TOAU UC600 alarms

Point D iagnostic Possible Cause

VFD not operating Outdoor and/or Return Air Dampers not

Operating Properly

Indoor Fan

Failure

OAD Proving

Switch

Discharge Air

Temp Source Failure

8 Fire Shutdown BAS ONLY

Low Temp

Lockout

Indoor Fan Motor Failure Indoor Fan F ailure Swit ch IFFS (pressure)

Failure IFFS Tubing damaged or not properly

connected Refer to startup procedure No voltage at actuator Failed OAD power transformer No co ntinuity thru e nd switch (che ck at UC) Note: If unit optional RA damper is

installed, send switch on OAD is always proven

BAS communication down Failed sensor or improper sensor

installation

Heat Overridden OFF Compressor(s) Overridden ON Setpoint Failures Incorre ct DAT sensor malfunction Reference Table 18, p. 53 for heat failure

issues

52 OAU-SVX01E-EN

Page 53

Alarms and Troubleshooting

Table 17. TO AU UC600 alarms (continued)

Point Diagnostic Possible Cause

Space Temp

Source Failure

OA Temp Source

Failure

OA Humidity

Source Failure

High Temp

Lockout

17 System Lockout

Space RH Source

Failure

ERV Leaving Air

Condition Failure

42 Heat Failure

BAS communication down Failed sensor or improper sensor

installation BAS communication down Failed sensor or improper sensor

installation Humidity Wiring is polarity sensitive Heat Overridden ON Low discharge air volume Dirty air filters High gas heater manifold pressure OA/RA damper position incorrect High temp limit not properly installed or

wired DAT sensor malfunction Check all Alarms External safety device failed open BAS communication down Failed sensor or improper sensor

installation Humidity Wiring is polarity sensitive Failed RH or temperature sensor Incorrectly installed or connect RH or T emp

sensor Applies to 5:1 and 10:1 Gas Heaters Only Tri ps after heat command “ON” and no GV

status offer 1 minute Refer to unit “Service Facts” heat control

LED status legend No gas, low gas pressure or high gas

pressure to unit Unit Manual shutoffs closed Heater inducer failure Heat relay failure Loose or incorrect wiring

Table 18. TOAU UC60 troubleshooting (continued)

Trouble Possible Cause

No gas supply to unit Unit manual gas valve(s) closed Heater high limit tripped Heat relay not energized

No Heat

No Compressor

Wide Discharge Temp Swings

Space too Hot, Cold or Humid

IFM or PEX VFD OC Trip

EX VFD only run to Min HZ Setting

ERV Will Not Run

Unit Trips Heater High Limit

Protonode Not Communicating

Conditions do not warrant call for heat Heater control module malfunction Roll out switch trip Main gas on-off switch OFF Inducer fan failure Heater air proving switch not making or failed Compressor limit switch(es) open Compressor relay not energized or failed Conditions do not warrant call for cooling or

dehumidification Discharge air sensor position must be at least

4 ft.-0 in. away from unit outlet Min and Max gas heater manifold pressures not set

correctly Setpoints no adjusted properly Space sensors not correctly located or wired Malfunctioning space sensor Overcurrent alarm requires max Hz set ting on VFD

be checked and set to not exceed motor nameplate amps

If supplied with RA pressure transducer and modulating damper setup is not installed or properly wired.

ERV leaving air temp below 34°F low temp cutout Interlocked with Exhaust fan if exhaust is not

running ERV will be OFF High fire gas manifold pressure too high Supply fan speed too low Dirty or clogged filters Restricted discharge air duct Temperature of air entering heater too high Defective high limit

Change Baud rate on UC600 to 38,400

Table 18. TOAU UC60 troublesh oo t ing

Trouble Possible Cause

No power supply to unit disconnect switch Power disconnect tripped Lockout alarm mode

Unit Not Running

OAU-SVX01E-EN 53

Emergency Stop condition exists Unit in Unoccupied mode Discharge air sensor failed or not installed and

connected to unit

Page 54

Alarms and Troubleshooting

RTRM Failure Modes

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this pr odu ct, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

Following is the listing of RTRM failure indication causes.

System Failure

Check the v oltage between R TRM terminals 6 and 9 on J6, it should read approximately 32 Vdc. If no voltage is present, a System failure has occurred. Refer to Step 4 in

“Microprocessor Control,” p. 52 for the recommended

troubleshooting procedure.

Cooling Failure

• CLP1 has opened during the 3 minute minimum “on time” during four consecutive compressor starts, check CLP1 or CLP2 by testing voltage between the J1-8 and J3-2 terminals on the RTRM and ground. If 24 Vac is present, the CLPs have not tripped. If no voltage is present, CLPs have tripped.

System Failure

Measure the voltage between terminals J6-9 & J6-6. Normal Operation = approximately 32 Vdc System Failure = less than 1 Vdc, approximately 0.75 Vdc

Cool Failure

Measure the voltage between terminals J6-8 and J6-6. Cool Operating = approximately 32 Vdc Cool Off = less than 1 Vdc, approximately 0.75 Vdc Cooling Failure = voltage alte rnates between 32 Vdc and

0.75 Vdc

54 OAU-SVX01E-EN

Page 55

Appendix

OAU Filter Guide

Table 19. OA1D Units

Evaporator

Thickness MERV Qty Height Width

2 in. 8, 13

4 in. 14

Auxiliary Module

Return Air

Thickness MERV Qty Height Width

2 in. 8 2 20 24

Outside Air

Thickness MERV Qty Height Width

2 in. 8 2 20 24

Inlet

Thickness Material Qty Height Width

2 in. Aluminum Mesh 3 16 25

Table 20. OA2 D Units

Evaporator

Thickness MERV Qty Height Width

2 in. 8, 13 9 20 18 4 in. 14 6 20 25

Auxiliary Module (46XX ERV)

Return Air

Thickness MERV Qty Height Width

2 in. 8

Outside Air

Thickness MERV Qty Height Width

2 in. 8

Auxiliary Module (58XX/ 64XX ERV)

Return Air

Thickness MERV Qty Height Width

2 in. 8 8 20 18

Outside Air

Thickness MERV Qty Height Width

2 in. 8 8 20 18

Inlet

Thickness Material Qty Height Width

2 in. Aluminum Mesh 6 20 20

216 20 216 25 216 20 216 25

225 20 125 16

Table 21. OA3D Units

Evaporator

Thickness MERV Qty Height Width

2 in. 8, 13 9 24 20 4 in. 14 9 24 20

Auxiliary Module (58XX ERV)

Return Air

Thickness MERV Qty Height Width

2 in. 8 6 18 20

Outside Air

Thickness MERV Qty Height Width

2 in. 8 6 18 20

Auxiliary Module (68XX / 74XX ERV)

Return Air

Thickness MERV Qty Height Width

2 in. 8 8 25 20

Outside Air

Thickness MERV Qty Height Width

2 in. 8 8 25 20

Inlet

Thickness Material Qty Height Width

2 in. Aluminum Mesh 10 16 25

OAU-SVX01E-EN 55

Page 56

Trane optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments, Trane of fers a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For more information, visit www.Trane.com.

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

We are committed to using environmentally conscious print practices that reduce waste.

Trane OA1D, OA2D, OA3D Installation and Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Warnings, Cautions, and Notices

Important Environmental Concerns

Important Responsible Refr iger ant Pr actices

Model Number Descriptions

Horizon Outdoor Air Unit

General Information

Overview of Manual

Model Number Description

Unit Nameplate

Indoor Fan Failure Input

Low Pressure Control ReliaTel Control

Refrigerant Circuits

Compressor Nameplate

Unit Description

High Pressure Control ReliaTel Control

Space Temperature / RH Sensor (Optional)

High Temperature Sensor

Outdoor Air Temperature and Relative Humidity Sensor

Control Input (Occupied / Unoccupied)

Hot Gas Reheat

Through the Base Electrical with Disconnect Switch

Through the Base Gas Piping

Hinged Access Doors

Modulating Electric Heat

100 Percent Outdoor Air Hood with Damper and Filters

Modulating Indirect Gas-Fired Burner

Unit Inspection

Storage

Unit Clearances

First Aid Measures

OA1 Units

Unit Clearances

Curb Dimensions

Dimensional Data

OA2 Units

Unit Clearances

Curb Dimensions

Dimensional Data

OA3 Units

Unit Clearances

Curb Dimensions

Dimensional Data

Unit Weight and Rigging

Unit Weight

Corner Weight

Rigging

Sequence of Operation

Sequence of Operation—”Occupied”

Sequence of Operation—”Unoccupied”

Dischar ge Air Control with Indirect Gas-Fired or Electric Heat and Modulating HGRH, ERV, and Powered Ex.

Sequence of Operation—”Occupied”

Sequence of Operation—”Unoccupied”

Installation

Ductwork

General Unit Requirements

Main Electrical Power Requirements

Condensate Drain Configuration

Filter Installation

Field Installed Power Wiring

Main Unit Power

Standard Wiring

Voltage Imbalance

Compressor Crankcase Heaters

Electrical Phasing (Three-Phase Motors)

Main Unit Display and ReliaTel Controls

Field-Installed Control Wiring

Control Power Transformer

Controls Using 24 Vac

Controls Using DC Analog Input/Output (Standard Low Voltage Multiconductor Wire)

DC Conductors

System Configuration and Pre-Start

Start-Up

Indirect Gas-Fired Heating Start-Up

Start-Up Procedure

Safety Controls