Carrier 38AU User Manual Page 1

Installation, Start-Up andService InstructionsCONTENTSSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1INSTALLATION GUIDELINES. .

10faces, plywood sheets may be placed against the sides of theunit, behind cables. Run cables to a central suspension point sothat the angle from the

11Table 5 — 38AUZ 07-08 Piping Recommendations (Single-Circuit Unit)Table 6 — 38AUD 12-14 Piping Recommendations (Two-Circuit Unit)Table 7 — 38AU Maxi

12INSULATE SUCTION LINES — Apply closed-cell tubularinsulation to all suction lines between evaporator coilconnection and 38AU unit’s suction service

13Table 9 — Refrigerant Specialities Part Numbers.Refer to Table 9 for recommendations on refrigerationspecialties.In some applications, depending on

14 Fig. 8 — Location of Sight Glass(es) and Filter Driers Typical 38AUD SystemsFig. 9 — Typical Piping Connection AssemblyEVACUATION/DEHYDRATION — Eva

15NOTE: TEST LEADS - Unit may be equipped with shortleads (pigtails) on the field line connection points on con-tactor C or optional disconnect switch

16Fig. 12 — Convenience Outlet LocationNon-powered type: This type requires the field installation ofa general-purpose 125-volt 15-A circuit powered f

17Fig. 14 — Weatherproof Cover InstallationAll Units —Voltage to compressor terminals during operation must bewithin voltage range indicated on unit n

18External Devices – The 38AU control transformers provide 24-v NEC Class 2 power sources to energize external control de-vices. These devices will in

19PRE-START-UPSystem Check1. Check all air handler(s) and other equipment auxiliarycomponents. Consult the manufacturer’s instructionsregarding any ot

2INSTALLATION GUIDELINEReplacement /Retrofit – R22 to Puron®Replacement/retrofit installations require change-out ofoutdoor unit, metering device, and

20Advanced Scroll Temperature Protection (ASTP)A label located above the terminal box identifies CopelandScroll compressor models that contain this te

21Fig. 19 — 38AUZ*07 Charging ChartFig. 20 — 38AUZ*08 Charging Chart

22Fig. 21 — 38AUD*12 Charging Chart

23Fig. 22 — 38AUD*14 Charging Chart

24Fig. 23 — Typical 38AUZ Wiring Diagram (50Hz Single Circuit Unit Shown)

25Fig. 24 — Typical 38AUD Wiring Diagram (50Hz Dual Circuit Unit Shown)

26OPERATING SEQUENCEBase Unit ControlsIndoor (Supply) FanThe indoor fan contactor (IFC) is remotely located at the fancoil or fan section. If the ther

27SERVICERefrigeration SystemCompressor Oil —Servicing Systems on Roofs With SyntheticMaterials — POE (polyolester) compressor lubricants areknown to

28Comfort Alert Diagnostic ModuleThe Comfort Alert Diagnostic Module (CADM) monitors andanalyzes data from the Copeland Scroll® three-phase compres-so

29Table 13 — LED Status CodesStatus LED Status LED Description Status LED Troubleshooting InformationGreen “POWER” Module has power Supply voltage is

3Fig. 1 — 38AU*07-14 Unit DimensionsUNITStandardWeightCornerACornerBCornerCCornerDCenter of Gravity Unit Heightlbs. kg. lbs. kg. lbs. kg. lbs. kg. lbs

30Table 14 — CADM TroubleshootingCrankcase Heater — The heater prevents refrigerantmigration and compressor oil dilution during shutdown when-ever com

31Fig. 27 — Typical Exterior, Single-Circuit Unit (38AUZ*08 shown)Fig. 28 — Typical Interior, Single-Circuit Unit (38AUZ*08 shown)Condenser FansServic

32Fig. 29 — Typical Exterior, Two-Circuit Unit (38AUD*14 shown)Fig. 30 — Typical Interior, Two-Circuit Unit (38AUD*14 shown)Condenser FansServiceValve

33NOVATION™ Coil Cleaning and Maintenance — To clean the NOVATION condenser coil, chemicals are NOTto be used; only water is approved as the cleaning

34TROUBLESHOOTINGPROBLEM SOLUTIONCOMPRESSOR DOES NOT RUNContactor Open1. Power off. 1. Restore power.2. Fuses blown in field power circuit. 2. After f

35TROUBLESHOOTING (cont)PROBLEM SOLUTIONCOMPRESSOR RUNNING BUT COOLING INSUFFICIENTSuction Pressure Low1. Refrigerant charge low. 1. Add refrigerant.2

36APPENDIX AAIR CONDITIONER AND HEAT PUMP WITHPURON® — QUICK REFERENCE GUIDE•Puron® (R-410A) refrigerant operates at 50 percent to70 percent higher pr

37APPENDIX CMOTORMASTER SENSOR LOCATIONSFig. 32 — 38AUZ*07-08 Motormaster Sensor Locations Fig. 33 — 38AUD*12-14 Motormaster Sensor Locations508 mm(20

Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. Edition Date:12/09 Catalog No: 38AU-C01SIManufacturer

CL-1III. START UPSTART-UP CHECKLISTI. PRELIMINARY INFORMATIONOUTDOOR: MODEL NO. SERIAL NO.INDOOR: AIR HANDLER MANUFACTURERMODEL NO. SERIAL NO. ADDITIO

4Table 1A — Physical Data — 38AUZ*07-08 Units — 50 Hz EnglishUNIT SIZE 38AU Z*07 Z*08NOMINAL CAPACITY (tons)67.5OPERATING WEIGHTS (lb)Aluminum-Fin Coi

Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 12/09 Catalog No: 38AU-C01SIManufacture

5Table 1B — Physical Data — 38AUZ*07-08 Units — 50 Hz SIUNIT SIZE 38AU Z*07 Z*08NOMINAL CAPACITY (kW)21.1 26.4OPERATING WEIGHT (kg)Aluminum-Fin Coils

6Table 2A — Physical Data — 38AUD*12-14 Units — 50 Hz EnglishUNIT SIZE 38AU D*12 D*14NOMINAL CAPACITY (tons)10 12.5OPERATING WEIGHTS (lb)Aluminum-Fin

7Table 2B — Physical Data — 38AUD*12-14 Units — 50 Hz SIUNIT SIZE 38AU D*12 D*14NOMINAL CAPACITY (kW)35.1 44OPERATING WEIGHT (kg)Aluminum-Fin Coils 19

8Fig. 2 — Model Number NomenclatureFig. 3 — Serial Number Nomenclature1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 1838AUZA07A0G9–0A0A0Model Type Packagi

9Matching 38AU Model To Evaporator Coil –The Model 38AUZ is a single-circuit unit design, requiring oneset of refrigeration piping. This model can be