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Carrier 38AUD 16 Series - User Manual

Carrier 38AUD 16 Series
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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...................

Table of Contents

Questions and Answers

  • C
    Christian DelgadoAug 14, 2025
    Why is my Carrier Air Conditioner compressor running but cooling insufficient?
    • K
      Kaylee WalkerAug 14, 2025
      If your Carrier Air Conditioner's compressor is running, but the cooling is insufficient, it could be due to: * Low suction pressure because of low refrigerant charge: Add refrigerant. * Low suction pressure because of low head pressure: Check refrigerant charge and outdoor-air fan thermostat settings. * Low suction pressure because of dirty air filters: Clean or replace the filters. * Low suction pressure because of a defective expansion valve power head: Replace the power head. * Low suction pressure because of a partially iced indoor coil: Check the low-pressure setting. * Low suction pressure because of restricted indoor airflow: Remove the obstruction. * High suction pressure because of excessive heat load: Check for open doors or windows near the fan coil.
  • Y
    Yvonne JohnsAug 20, 2025
    What to do if Carrier Air Conditioner unit operates too long?
    • S
      Steven WatsonAug 21, 2025
      If your Carrier Air Conditioner operates too long or continuously, it could be due to several reasons: * Low refrigerant charge: Add refrigerant. * Control contacts fused: Replace the control. * Air in the system: Purge and evacuate the system. * Partially plugged expansion valve or filter drier: Clean or replace them.
  • L
    Laura MillerAug 27, 2025
    Why is my Carrier 38AUD 16 Air Conditioner system noisy?
    • J
      johnmcknightAug 27, 2025
      If your Carrier Air Conditioner system is noisy, it may be due to: Piping vibration, which can be resolved by supporting the piping as required; or a noisy compressor, which may need replacing if the bearings are worn.
  • T
    thomas69Sep 3, 2025
    What causes a hot liquid line in Carrier 38AUD 16 Air Conditioner?
    • A
      Amy GarciaSep 3, 2025
      A hot liquid line in your Carrier Air Conditioner can be caused by: * A shortage of refrigerant due to a leak: Repair the leak and recharge the system. * An expansion valve that opens too wide: Adjust the expansion valve.
  • R
    Robert LowerySep 6, 2025
    What causes a frosted liquid line on Carrier 38AUD 16 Air Conditioner?
    • C
      Cynthia GreerSep 6, 2025
      A frosted liquid line on your Carrier Air Conditioner may be due to: * A restricted filter drier: Remove the restriction or replace the drier. * A liquid line solenoid valve that is partially closed: Replace the valve.
  • H
    heather24Sep 9, 2025
    Why is my Carrier Air Conditioner compressor losing oil?
    • M
      Michelle ChandlerSep 9, 2025
      Your Carrier Air Conditioner compressor might be losing oil due to: * A leak in the system: Repair the leak. * Crankcase heaters not energized during shutdown: Check wiring and relays, and replace the heater if defective. * Improper interconnecting piping design: Check the piping for oil return and replace if necessary.
  • W
    William BrownNov 16, 2025
    Why is my Carrier Air Conditioner compressor not running?
    • B
      Brittany ChapmanNov 16, 2025
      If the compressor of your Carrier Air Conditioner isn't running, it might be due to an open contactor. To resolve this: * Restore power. * Replace the fuse with the correct size after identifying and fixing the cause. * Check the control transformer primary connections and circuit breaker. * Verify the thermostat setting. * Reset the lockout circuit. * Check for refrigerant undercharge or obstructions in indoor airflow. Ensure the liquid line solenoid valve(s) is open. * Check for refrigerant overcharge, obstructions in outdoor airflow, or air in the system. Ensure outdoor fans are operating correctly. * Check for an open condition and allow for reset. Replace if defective. * Tighten all connections. If the contactor is closed, check the connections, look for a blown fu...
  • J
    Jesus Johnson MDNov 23, 2025
    What to do if Carrier 38AUD 16 Air Conditioner compressor stops on high-pressure switch?
    • T
      Tammy GarnerNov 23, 2025
      If the compressor on your Carrier Air Conditioner stops due to the high-pressure switch, consider these potential causes and solutions: * **Outdoor Fan On:** * Faulty high-pressure switch: Replace the switch. * Reversed fan rotation: Confirm and correct the rotation if necessary. * Restricted airflow: Remove any obstructions. * Air recirculating: Clear the airflow area. * Noncondensables in the system: Recover refrigerant and recharge as required. * Refrigerant overcharge: Recover refrigerant as needed. * Incorrect line voltage: Consult the power company. * Refrigerant system restrictions: Check or replace the filter drier, expansion valve, etc. * **Outdoor Fan Off:** * Fan slips on shaft: Tighten the fan hub setscrews. * Mot...
  • K
    kingalexanderDec 1, 2025
    Why does my Carrier Air Conditioner compressor cycle on low-pressure switch?
    • E
      erin65Dec 1, 2025
      If your Carrier Air Conditioner compressor cycles on the low-pressure switch, here are some potential causes and solutions: * **Indoor-Air Fan Running:** * Liquid line solenoid valve(s) fails to open: Check the liquid line solenoid valve(s) for proper operation and replace if necessary. * Filter drier plugged: Replace the filter drier. * Expansion valve power head defective: Replace the power head. * Low refrigerant charge: Add charge and check the low-pressure switch setting. * **Indoor-Air Fan Stopped:** * Electrical connections loose: Tighten all connections. * Fan relay defective: Replace the relay. * Motor overload open: Power supply. * Motor defective: Replace the motor. * Fan belt broken or slipping: Replace or tighten the b...

Carrier 38AUD 16 Series Specifications

General IconGeneral
TypeDuctless Mini-Split
RefrigerantR-410A
Seasonal Energy Efficiency Ratio (SEER)Up to 16
Heating Seasonal Performance Factor (HSPF)Up to 9.0
Voltage208/230V
Phase1

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