With PuronR R---410ARefrigerant Sizes
CONTENTS
Installation, Start---Upand Service Instructions
38AU Air Cooled Condensing Units 60 Hz
UNIT OPERATION AND SAFETY HAZARD
SAFETY CONSIDERATIONS
INSTALLATION GUIDELINE
Replacement/Retrofit - R-22to PuronR
UNIT DAMAGE HAZARD
Installation
38AU
38AU
Fig. 1 - 38AU**16 Unit Dimensions
38AUZ*25
Fig. 2 - 38AU**25 Unit Dimensions
38AU
UNIT
UNIT SIZE 38AU
38AU
UNIT SIZE 38AU
38AU
UNIT SIZE 38AU
38AU
UNIT SIZE 38AU
38AU
38AU
3 8 A U Z A 2 5 A 0 G 6 A 0 A 0 A
Fig. 3 - Model Number Nomenclature
Fig. 4 - Serial Number Nomenclature
Matching 38AU Model To Evaporator Coil
INSTALLATION
Step 2 - Complete Pre-InstallationChecks
Fig. 5 - Service Clearance Dimensional Drawing
Step 5 - Complete Refrigerant Piping Connections
Provide Safety Relief
Step 3 - Prepare Unit Mounting Support
Step 4 - Rig and Mount the Unit
Model
Liquid Lift
Suction Riser
38AU
38AU
Insulate Suction Lines
Hot Gas Bypass
38AUD Piping Connections
Puron-dutyFilter Driers
Fig. 6 - 38AUD Service Valve Locations
Install Filter Driers and Moisture Indicators
Fig. 7 - Typical Evaporator Coil Connections 40RU
Capacity Control Liquid Line Solenoid Valve
Install Liquid Line Solenoid Valve
Typical 38AUZ Systems
Typical 38AUD Systems
Preliminary Charge
Step 6 - Install Accessories
Fig. 10 - Typical Piping Connection Assembly
Evacuation/Dehydration
Units with Factory-InstalledDisconnect
Field Power Supply
Fig. 11 - Disconnect Switch and Unit
Units Without Factory-InstalledDisconnect
ELECTRICAL OPERATION HAZARD
Fig. 12 - Power Wiring Connections
Fig. 14 - Powered Convenience Outlet Wiring
Convenience Outlets
38AU
Fig. 16 - Weatherproof Cover Installation
Field Control Wiring
Convenience Outlet Utilization
Thermostat
38AUD Control Circuit Wiring
Control Transformer Wiring
Fig. 19 - Control Transformer Wiring
38AU
5.Unbalanced 3-PhaseSupply Voltage
Legend and Notes for Table
System Check
To correct phase order
PRE-START-UP
START-UP
Start Unit
Advanced Scroll Temperature Protection ASTP
Adjust Refrigerant Charge
Using plotted operating point
Final Checks
Fig. 23 - 38AUZ*16 Charging Chart Novation
38AUZ*25 Check Compressor Oil Level
Fig. 22 - Recommended Oil Level - 38AUZ*25
CIRCUIT
Fig. 24 - 38AUD*16 Charging Chart Novation
38AU
CIRCUIT
C10947
Fig. 25 - 38AUZ*16 Charging Chart RTPF
Fig. 26 - 38AUZ*25 Charging Chart RTPF
38AU
38AU
Fig. 27 - 38AUD*16 Charging Chart RTPF
C10949
38AU
Fig. 28 - 38AUD*25 Charging Chart RTPF
C10950
C10212A
38AU
C10213A
38AU
Cooling, Unit Without Economizer
OPERATING SEQUENCE
Base Unit Controls
Indoor Supply Fan
Synthetic Roof Precautionary Procedure
ROUTINE SYSTEM MAINTENANCE
SERVICE
Seasonal Maintenance
SEAT
Field Refrigerant Access Ports
Factory High-FlowAccess Ports
Fig. 31 - CoreMax Access Port Assembly
Fig. 32 - CADM Housing/LED Locations
Comfort Alert Diagnostic Module
38AU
Status LED
Table 11 - LED Status Codes
Status LED Troubleshooting Information
38AU
High-PressureSwitch
Table 12 - CADM Troubleshooting
Compressor Overtemperature Protection IP
Low-PressureSwitch
Fig. 35 - 38AUD*16 Piping
Condenser Fans/Motors Access Panel Control Box
Compressors Service Valves
Fig. 34 - 38AUD Size 16 Cabinet
Oil Equalizer Line
Fig. 36 - 38AUZ*16 Compressor Assembly Rear View
Fig. 37 - 38AUD*16 Compressor Assembly Rear View
Equalization LPS
Compressors Service Valves
Fig. 38 - 38AUZ,D Size 25 Cabinet
Fig. 39 - 38AUD*25 Piping
Condenser Fans/Motors Access Panel Control Box
C10215
Fig. 40 - 38AUZ*25 Compressor Assembly Rear View
Fig. 41 - 38AUD*25 Compressor Assembly Rear View
38AU
NOVATIONt Type
NOVATION Coil Cleaning and Maintenance
Repairing NOVATION Condenser Tube Leaks
Coil Type Identification
38AU
Replacing NOVATIONt Condenser Coil
UNIT RELIABILITY HAZARD
UNIT DAMAGE HAZARD
38AU
TROUBLESHOOTING
FASTENER TORQUE VALUES
Table 13 - Torque Values
38AU
TROUBLESHOOTING cont
Air Conditioner & Heat Pump with PURON→
Wiring Diagram List
APPENDIX A
APPENDIX B
Operation
Low Ambient Option - Factory Installed
Troubleshooting
APPENDIX C
38AUZ*16/25 & 38AUD*16/25 RTPF
Fig. 44 - Motormaster Sensor Location
Fig. 45 - Motormaster Sensor Location
38AUZ*16 & 38AUD*16 Novation
38AU
Table 14 - Wind Baffle Dimension
38AU
Fig. 46 - Wind Baffles - Fabrication
C10363A
C10366
38AU
BACK
Fig. 48 - Wind Baffle Installation - 15 Ton Units
FRONT
LEFT
LEFT
Fig. 49 - Wind Baffle Installation - 20 Ton Units
FRONT
BACK
Replaces 38AU---07SI
38AU
Catalog No 38AU---09SI
Edition Date 11/10
OUTDOOR UNIT
START-UPCHECKLIST
I. PRELIMINARY INFORMATION
II. PRE-START-UP
38AU
CHECK VOLTAGE IMBALANCE