Trane Horizon OANG Series User Manual

Table of Contents
OAU-SVX006E-EN 7
Safety Controls . . . . . . . . . . . . . . . . . . . . . 57
. . . . . . . . . . . . . . . . . . . . . . . . . Maintenance 58
Monthly Maintenance . . . . . . . . . . . . . . . . . 58
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Supply/Return Air Smoke Detector Mainte-
nance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Cooling Season . . . . . . . . . . . . . . . . . . . . 58
Heating Season . . . . . . . . . . . . . . . . . . . . 58
Condenser Coil Cleaning . . . . . . . . . . . . . 58
General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Alarms and Troubleshooting . . . . . . . . . . . . 68
Microprocessor Control . . . . . . . . . . . . . . 68
System Alarms . . . . . . . . . . . . . . . . . . . . . 68
Sensor Failure Alarm Display . . . . . . . . . 68
RTRM Failure Modes . . . . . . . . . . . . . . . . 72
Condenser Fan VFD Troubleshooting . . 72
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
OAU Filter Guide . . . . . . . . . . . . . . . . . . . . . 73
Attention Startup or Service Technician . . 78
Horizon UC600 v11.0 Released . . . . . . . . 78
Documents Included in This Packet: . . . . 78
Unchanged from Previous Versions: . . . 78
Summary of Improvements . . . . . . . . . . . . 78
Suction Pressure Monitoring . . . . . . . . . 78
Compressor Run Status and Diagnostics 78
Updated Point Names to Match Tracer SC 78
Evaporator Leaving Temperature Setpoint
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Minimum Supply Air Flow Setpoints . . . 78
Single Zone VAV Mod. Air Flow - Heating
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Gas Heater Staging Off at Minimum Capacity
78
Reduced Hot Gas Reheat Purge Mode . . 78
Unit Shutdown Due to Condensate Overflow
78
Liquid Line Pressure Setpoint Reset . . . . 78
Modulating ERV Exhaust and Outdoor Air By-
pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Space Control or Single Zone VAV and OA
Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Discharge Air Temp. Reset for Single Zone
VAV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Supply Fan Tracking for Exhaust Fan (Field
Enabled) . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Hot Water Reheat . . . . . . . . . . . . . . . . . . . .79
Expanded Fallback Control . . . . . . . . . . . .79
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Program-Controlled Setpoints . . . . . . . . . . .80
Space Control and Single Zone VAV Control
80
Discharge Air Control and Multi-Zone VAV
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Occupied Control . . . . . . . . . . . . . . . . . . . . . .80
Starting Sequence . . . . . . . . . . . . . . . . . . .80
Supply Fan Sequence . . . . . . . . . . . . . . . .80
Economizer Mode . . . . . . . . . . . . . . . . . . . . .81
Ventilation Mode . . . . . . . . . . . . . . . . . . . . . .81
Discharge Air Control . . . . . . . . . . . . . . . .81
Space Control . . . . . . . . . . . . . . . . . . . . . . .81
Single Zone VAV Control . . . . . . . . . . . . . .81
Primary Heating Mode . . . . . . . . . . . . . . . . .81
Discharge Air Control . . . . . . . . . . . . . . . .81
Multi-Zone VAV Control . . . . . . . . . . . . . .81
Space Control or Single Zone VAV Control,
with Energy Recovery Wheel or has Mixed
Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Space Control or Single Zone VAV Control
with No Energy Recovery Wheel and 100%
Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . .82
Gas Heat Ignition Failure . . . . . . . . . . . . . .82
Heat Pump Heating Mode . . . . . . . . . . . . . .82
Water Source Heat Pump . . . . . . . . . . . . .82
Air Source Heat Pump – Demand Defrost
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . . . .82
Discharge Air Control . . . . . . . . . . . . . . . .82
Multi-Zone VAV Control . . . . . . . . . . . . . .82
Space Control or Single Zone VAV Control
with No Energy Recovery Wheel and 100%
Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . .83
Compressor Low Ambient Lockout . . . . .83
Evaporator Frost Protection . . . . . . . . . . .83
Dehumidification Mode . . . . . . . . . . . . . . . .83
Discharge Air Control . . . . . . . . . . . . . . . .83

Trane Horizon OANG Series Specifications

General

Brand	Trane
Model	Horizon OANG Series
Category	Heat Pump
Language	English