Trane Horizon OADG Series User Manual

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

Trane Horizon OADG Series Specifications

General

Brand	Trane
Model	Horizon OADG Series
Category	Heat Pump
Language	English