Trane Horizon OANG Series - Refrigeration Circuit Diagrams

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General Data

66 OAU-SVX006E-EN

Superheat and Refrigeration

Circuit Data

Figure 43. Refrigeration diagram: Tandem compressor

without reheat

Figure 44. Refrigeration diagram: Tandem compressor

with reheat

Main Page

Table of Contents6
Model Number Descriptions9
Horizon Outdoor Air Unit9
Model: OADG and OANG9
General Information12
Overview of Manual12
Model Number Description12
Unit Nameplate12
Compressor Nameplate12
Unit Description12
Indoor Fan Failure Input12
Low Pressure Control Reliatel Control12
Refrigerant Circuits12
High Pressure Control Reliatel Control12
Space Temperature / RH Sensor (Optional)13
High Temperature Sensor13
Outdoor Air Temperature and Relative Humidity Sensor13
Control Input (Occupied / Unoccupied)13
Hot Gas Reheat13
Percent Outdoor Air Hood with Damper and Filters13
Modulating Indirect Fired Gas Burner13
Through the Base Electrical with Disconnect Switch13
Hinged Access Doors13
Electric Heat13
Hot Water Coils14
Suction Pressure Monitoring14
Head Pressure Control14
First Aid Measures14
Storage14
Unit Clearances15
Unit Clearances, Curb Dimensions, and Dimensional Data16
OAD Units16
Unit Clearances16
Curb Dimensions17
Dimensional Data18
OAN Units21
Unit Clearances21
Curb Dimensions21
Unit Weight and Rigging25
Unit Weight25
Installation29
Ductwork29
General Unit Requirements30
Main Electrical Power Requirements30
Condensate Drain Configuration30
Hot Water Connection Size and Location31
Chilled Water Connection Size and Location31
Filter Installation32
Field Installed Power Wiring32
Main Unit Power34
Standard Wiring34
Electrical Phasing (Three-Phase Motors)35
Compressor Crankcase Heaters36
Main Unit Display and Reliatel Controls36
Field-Installed Control Wiring36
Control Power Transformer37
Controls Using 24 Vac37
Controls Using DC Analog Input/Output (Standard Low Voltage Multiconductor Wire)37
DC Conductors38
Factory-Provided Sensors38
Pre-Start Check List39
System Configuration and Pre-Start40
Pre-Start up50
Start up50
Cooling Start up50
Startup52
Indirect Fired Gas Heating Startup52
Startup Procedure53
Multi-Zone VAV Control83
Space Control with Energy Recovery Wheel or Has Mixed Air83
Space Control with no Energy Recovery Wheel and 100% Outdoor Air83
Hot Gas Reheat Purge83
Supplemental Electric Reheat (Not Included in Standard Operation)83
Supplemental Hot Water Reheat84
Hot Water Reheat (no Hot Gas Reheat Installed)84
Exhaust Fan Operation with Isolation Exhaust Fan Damper(S)84
Without Isolation Exhaust Fan Dampers84
With Modulating OA/RA Dampers84
ECM Exhaust with 2-Position OA Damper84
VFD Exhaust with 2-Position OA Damper84
Energy Recovery Wheel Operation (ERV)84
Energy Wheel Without VFD84
Energy Wheel with VFD84
Outdoor Airflow Monitoring85
Optional Field Enabled Features Demand Control CO2 Ventilation85
Exhaust Fan Tracking85
Static Pressure Control for Exhaust Fan85
Unoccupied Operation85
Starting Sequence85
With Return Air Damper Installed85
No Return Air Damper Installed85
Unoccupied Heating Mode85
Unoccupied Dehumid Mode85
Sensor Source Failures87
Economizer Fault Detection and Diagnostics87
Trane ® Horizon™ DOAS88
Pre-Startup Checklist88
Voltages89
Motor Data90
Compressor Data90
Actuators90
Test Procedures91
Furnace Data92
Gas Pressure Settings92
Electric Heat Startup92
Heater Data92
Program Control Type (MV-13)93
Description93
Commissioning93

Trane Horizon OANG Series - Refrigeration Circuit Diagrams

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