1
38AU
Air Cooled Condensing Units
60 Hz
With Puron
R
(R---410A) Refrigerant
S i z e s 1 6 --- 2 5
Installation, Start---Up
and Service Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
INSTALLATION GUIDELINES 2..................
Replacement/Retrofit — R--22 to Puron 2...........
Matching 38AU Model to Evaporator Coil 11........
INSTALLATION 11 - 26.........................
Jobsite Survey 11...............................
Step 1 -- Plan for Unit Location 11.................
Step 2 -- Complete Pre--Installation Checks 11........
Step3–PrepareUnitMounting Support 12..........
Step4–RigandMount the Unit 12................
Step 5 -- Determine Refrigerant Pipe Sizes 12........
Step6–CompleteRefrigerantPipingConnections 17...
Step7–InstallAccessories 20....................
Step8–CompleteElectricalConnec tions 20.........
Step 9 -- Wind Baffles for Low Ambient Control 26...
PRE-START-UP 26...............................
System Check 26...............................
Turn On Crankcase Heater 26.....................
Preliminary Charge 26...........................
START--UP 26- 34...............................
Preliminary Checks 26...........................
Start Unit 27...................................
OPERATING SEQUENCE 35......................
Base Unit Controls 35...........................
Indoor (Supply) Fan 35..........................
Cooling, Unit Without Economize r 35..............
38AUDC, Unit with Hot Gas Bypass (HGBP) 35......
Cooling, Unit With Economizer 37.................
Heating 37....................................
ROUTINE SYSTEM MAINTENANCE 37............
Quar ter ly Insp ection (and 30 days after initial start) 37...
Seasonal Maintenance 37........................
SERVICE 37 - 48................................
Refrigeration Syste m 37.........................
Compressor Oil 38..............................
Servicing Systems on Roofs with
Synthetic Materials 38...........................
Liquid Line Filter Drier 38.......................
Field Refrigerant Access Ports 38..................
Factory High--Flow Access Ports 38................
Hot Gas Bypass Value Adjustments 39..............
Comfort Alert Diagnostic Module 39...............
Compressor Protection 41........................
Crankcase Heater 41............................
Low--Pressure Switch 41.........................
High--Pressure Switch 41.........................
Outdoor Fans 41................................
Lubrication 41.................................
Coil Type Identification 46
.......................
N OVAT I O N tCoil Cleaning and Maintenance 46.....
Repai ring NOVATION Condenser Tube Leaks 46.....
Repla cing NOVATION Condenser Coil 47...........
Routine Cleaning of Round-Tube Plate Fin
(RTPF) Coils 47................................
Fastener Torque Values 48........................
TROUBLESHOOTING 48 -- 49.....................
APPENDIX A
Air Conditioner & Heat Pump with Puron
R
—
Quick Reference Guide 50.........................
APPENDIX B
Wiring Diagram List 50...........................
APPENDIX C
Low Ambient Option — Factory Installed 50..........
START--UP CHECKLIST 59 -- 60...................
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