Page 1: Table Of Contents
38AUD Air Cooled Condensing Units 50 Hz With Puron (R---410A) Refrigerant Sizes 16---25 Installation, Start---Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS ....SERVICE .
Page 2: Safety Considerations
SAFETY CONSIDERATIONS WARNING Improper installation, adjustment, alteration, service, PERSONAL INJURY AND ENVIRONMENTAL maintenance, or use can cause explosion, fire, electrical HAZARD shock or other conditions which may cause personal Failure to follow this warning could cause in personal injury or property damage. Consult a qualified installer, injury or death.
Page 3 Same tube sizes are capable of handling higher flowrates 5. Install a new field-supplied liquid-line filter drier at (expressed as tons of cooling capacity) with Puron the indoor coil just upstream of the TXV or fix orifice refrigerant compared to R- - 22 at constant pressure drops. metering device.
Page 4 C10990 Standard Corner Corner Corner Corner Unit UNIT Center of Gravity Weight Height lbs. lbs. lbs. lbs. lbs. 38AUD*16 965.2 mm 482.6 mm 381 mm 1279.2 mm 65.5 (MCHX) 38 in 19 in 15 in 38AUD*16 965.2 mm 482.6 mm 431.8 mm 1279.2 mm (RTPF)
Page 5 C10991 Standard Corner Corner Corner Corner Unit UNIT Center of Gravity Weight Height lbs. lbs. lbs. lbs. lbs. 965.2 mm 584.2 mm 431.8 mm 1279.2 mm 38AUD*25 38 in 23 in 17 in 50.36 in Fig. 2 - - 38AUD*25 Unit Dimensions...
Page 6 Table 1A — Physical Data — 38AUD*16-25 Units — 50 Hz SI UNIT SIZE 38AU D*16 D*25 NOMINAL CAPACITY (kW) 52.7 70.3 OPERATING WEIGHT (kg) NOVATION Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A R-410A † NOVATION Operating Charge A/B, Typical (kg) 6.4 / 6.4 NOVATION Shipping Charge A/B (kg)
Page 7 Table 1B — Physical Data — 38AUD*16-25 Units — 50 Hz English UNIT SIZE 38AU D*16 D*25 NOMINAL CAPACITY (tons) OPERATING WEIGHTS (lb) NOVATION Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † NOVATION Operating Charge A/B, 50Hz Typical (lb) 14.0 / 14.0 NOVATION Shipping Charge A/B (lb) 6.1 / 6.1...
Page 8: Installation
10 11 12 13 14 15 16 17 18 3 8 A U Z A 2 5 A 0 G 9 A 0 A 0 A 0 Model Type Packaging 38AU = Carrier Condensing Unit 0 = Standard Puron ®...
Page 9: Step 1 - Plan For Unit Location
Step 1 — Plan for Unit Location S Allow sufficient space for airflow clearance, wiring, refrigerant piping, and servicing unit. See Fig. 1 and Select a location for the unit and its support system (pad, Fig. 2 for unit dimensions and weight distribution data. rails or other) that provides for the minimum clearances required for safety.
Page 10: Step 5 - Complete Refrigerant Piping Connections
The 38AUD has two separate refrigeration systems. If specialties. Refer to Part 3 of the Carrier System Design required, each circuit will require a field-supplied/installed Manual for additional data and information on equivalent supplemental relief device.
Page 11 English units of measure (I---P) NOTE: For applications with equivalent length greater than 57 m (188 ft) and/or linear length greater than 38 m (125 ft), contact your local Carrier representative. Table 5 – Insulate Suction Lines — 38AUD Maximum Suction Pipe Size...
Page 12 Hot Gas Bypass — When a single piece evaporator coil with two separate circuits is connected to a 38AUD, the lower coil circuit Hot gas bypass, if used, should be introduced before the should be connected to the 38AUD’s Circuit 1 so that the evaporator.
Page 13 Install Filter Drier(s) and Moisture Indicator(s) — EQUALIZER LINE SENSING Every unit MUST have a filter drier in the liquid line. BULB 38AUD models require two filter driers (one in each liquid AIRFLOW line). Locate the filter driers at the indoor unit, close to the 15 DIAMS CKT 2 evaporator coil’s thermal expansion valve (TXV) inlets.
Page 14 For linear line lengths longer than 38 m (125 ft), contact your local Carrier representative for system charge value. This unit is designed for use with Puron (R- - 410A) refrigerant. Do not use any other refrigerant in this...
Page 15: Step 6 - Install Accessories
Step 6 — Install Accessories WARNING Accessories requiring modifications to unit wiring should be completed now. These accessories may include Winter FIRE HAZARD Start controls, Low Ambient controls. Refer to the Failure to follow this warning could cause in personal instructions shipped with the accessory.
Page 16 Factory Disconnect a PremierLink controller (available as a field-installed Wiring Switch accessory, for use on a Carrier Comfort Network or as a stand alone control). Disconnect factory test leads; discard. C10074 Fig. 11 - - Power Wiring Connections Table 8 – American/European Wire Conversions...
Page 17 Thermostat — Control Circuit Wiring — Install a Carrier-approved accessory thermostat according Control voltage is 24 v. See Fig. 19 and Fig. 20 and the to installation instructions included with the accessory. unit’s label diagram for field- - supplied wiring details.
Page 18 Table 9 – Electrical Data — 38AUD*16- - 25 50 Hz Units VOLTAGE COMPRESSOR 1 COMPRESSOR 2 OFM (ea) FUSE RANGE‡ UNIT V-Ph-Hz SIZE SIZE WATTS 38AUD*16 400--- 3--- 50 12.2 12.2 29.6 38AUD*25 400--- 3--- 50 16.7 16.7 40.4 Legend and Notes for Table 9 LEGEND: Example: Supply voltage is 400-3-50...
Page 19: Pre-Start-Up
PRE-START-UP CAUTION IMPORTANT: Before beginning Pre-Start-Up or UNIT DAMAGE HAZARD Start-Up, review Start-Up Checklist at the back of this Failure to follow this caution may result in equipment book. The Checklist assures proper start-up of a unit damage. and provides a record of unit condition, application Prior to starting compressor, a preliminary charge of requirements, system information, and operation at refrigerant...
Page 20: Start Unit
Refer to Cooling Charging Charts, Fig. 16 through Fig. 18. For applications with line lengths greater than 38m (125 ft), contact Carrier representative. Vary refrigerant until the conditions of the chart are met. Note that the charging charts are different from the type normally used. The charts are based on charging the units to the correct subcooling for the various operating conditions.
Page 21 (CIRCUIT 1) (CIRCUIT 2) C10946 Fig. 16 - - 38AUD*16 Charging Chart (Novation)
Page 22 C10949 Fig. 17 - - 38AUD*16 Charging Chart (RTPF)
Page 23 (CIRCUIT 1) (CIRCUIT 2) C10950 Fig. 18 - - 38AUD*25 Charging Chart (RTPF)
Page 24 C10084A Fig. 19 - - Typical 38AUD*16 Wiring Diagram...
Page 25 C10085A Fig. 20 - - Typical 38AUD*25 Wiring Diagram...
Page 26: Operating Sequence
OPERATING SEQUENCE As space cooling load is satisfied, thermostat outputs Y2 and Y1 are de- - energized, removing 24-v at 38AUD Base Unit Controls terminals Y2 and Y1. Circuit 2 compressor stops on Y2 opening; SVR2 is de-energized and LLSV2 closes. Indoor (Supply) Fan —...
Page 27: Routine System Maintenance
ROUTINE SYSTEM MAINTENANCE SERVICE Refrigeration System These items should be part of a routine maintenance program, to be checked every month or two, until a CAUTION specific schedule for each can be identified for this installation: Quarterly Inspection (and 30 days after initial start) — EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in damage to Indoor section...
Page 28: Liquid Line Filter Drier
Liquid Line Filter Drier — Factory High-Flow Access Ports — The factory-provided filter drier is specifically designed to There are two additional access ports in the system - on operate with Puron. Replace the filter drier with the suction tube between the compressor and the suction factory-authorized components only with a filter drier with service valve and on the liquid tube near the liquid service desiccant made from 100% molecular sieve grade XH-11.
Page 29: Comfort Alert Diagnostic Module
Comfort Alert Diagnostic Module POWER (GRN) The Comfort Alert Diagnostic Module (CADM) monitors  and analyzes data from the Copeland Scroll three-phase compressor and the thermostat demand. The CADM also provides a 3-minute anti-recycle time delay to compressor cycling. The CADM detects causes for electrical and system related failures without any sensors.
Page 30 Table 10 – LED Status Codes Status LED Status LED Description Status LED Troubleshooting Information Green “POWER” Module has power Supply voltage is present at module terminals Compressor protector is open Red “TRIP” Thermostat demand signal LED On Solid Y is present, but the com- Condensing unit power disconnect is open pressor is not running.
Page 31: Compressor Protection
Table 11 – CADM Troubleshooting Miswired Module Indication Recommended Troubleshooting Action Green LED is not on, Determine if both R and C module terminals are connected. Verify voltage in present at module’s R module does not power up and C terminals. NOTE: The CADM requires a constant nominal 24VAC power supply.
Page 32 Condenser Fans/Motors Access Panel - Control Box & Compressors Service Valves C10087 Fig. 24 - - 38AUD Size 16 Cabinet C10095 Fig. 25 - - 38AUD*16 Piping...
Page 33 Condenser Fans/Motors Access Panel - Control Box & Compressors Service Valves C10089 Fig. 26 - - 38AUD Size 25 Cabinet C10090 Fig. 27 - - 38AUD*25 Piping...
Page 34 C10088 Fig. 28 - - 38AUD*16 Compressor Assembly (Rear View) C10091 Fig. 29 - - 38AUD*25 Compressor Assembly (Rear View)
Page 35: Coil Type Identification
Coil Type Identification 38AU units are available with different coil types. Cleaning methods differ for each type so identifying the coil type is important. Unit model number and appearance can identify the coil type. NOVATIONt Type — The new NOVATION Heat Exchanger Technology is an all- - aluminum construction with louvered serpentine fins over single- - depth crosstubes.
Page 36: Replacing Novation Condenser Coil
RTPF coils. This UNIT RELIABILITY HAZARD cleaner is available from Carrier Replacement parts division Failure to follow this caution may result in reduced as part number P902-0301 for a 3.8 liter (1 gallon) container, unit performance.
Page 37: Fastener Torque Values
FASTENER TORQUE VALUES 7. Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Table 12 – Torque Values Avoid spraying in horizontal pattern to minimize po- Compressor mounting bolts 734–847 N–cm tential for fin damage. (65--- 75 in–lbs) 8.
Page 38: Troubleshooting
TROUBLESHOOTING (cont) PROBLEM SOLUTION COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH Indoor-Air Fan Running 1. Liquid line solenoid valve(s) fails to open. 1. Check liquid line solenoid valve(s) for proper operation. Replace if necessary. 2. Filter drier plugged. 2. Replace filter drier. 3.
Page 39: Air Conditioner & Heat Pump With Puron Quick Reference Guide
APPENDIX A S POE oils absorb moisture rapidly. Do not expose oil to AIR CONDITIONER & HEAT PUMP WITH atmosphere.  PURON — QUICK REFERENCE GUIDE S POE oils may cause damage to certain plastics and  S Puron (R-410A) refrigerant operates at 50 percent to roofing materials.
Page 40: Low Ambient Option - Factory Installed
APPENDIX C Low Ambient Option — Factory Installed Troubleshooting — OBSERVATION POSSIBLE REMEDY Units with the factory installed low ambient option are Fans won’t start All fans: equipped with a Motormaster solid- - state head pressure Check power & wiring control which regulates fan speed.
Page 41 Motormaster Sensor - Must be positioned on Vapor Stub of Circuit 1 coil only. Motormaster Sensor 254 mm (10 in) C10094 C10093 Fig. 33 - - Motormaster Sensor Location: Fig. 32 - - Motormaster Sensor Location: 38AUD*16/25 (RTPF) 38AUD*16 (Novation)
Page 42 Table 13 – Wind Baffle Dimension DIMENSIONS --- MM UNIT BAFFLE LEFT SIDE 1095 1015 BACK 2037 2056 2075 1095 1015 38AUD*16 (MCHX) RIGHT SIDE 1002 1021 1095 1015 FRONT 1095 LEFT SIDE 1095 1022 BACK 2037 2056 2075 1095 1015 38AUD*16 (RTPF)
Page 46 C10368 Fig. 37 - - Wind Baffle Installation — 70.3 kW Units E 2019 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04 ---53380036 ---01 Printed in U.S.A.
Page 47: Start-Up Checklist
START-UP CHECKLIST I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIRHANDLER MANUFACTURER MODEL NO. SERIAL NO. ADDITIONAL ACCESSORIES II. PRE-START-UP OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? (Y/N) IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT? (Y/N) HAS THE GROUND WIRE BEEN CONNECTED? (Y/N)
Page 48 COMPRESSOR 1 AMPS (L1/L2/L3) COMPRESSOR 2 AMPS (L1/L2/L3) NOTES: E 2019 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04 ---53380036 ---01 Printed in U.S.A.

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