Carrier 38AUZ Installation, Start-Up And Service Instructions Manual
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Carrier 38AUZ Installation, Start-Up And Service Instructions Manual

Air-cooled condensing units 60 hz with puron (r-410a) refrigerant
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38AUZ
Air-Cooled Condensing Units
60 Hz
®
with Puron
(R-410A) Refrigerant
Sizes 07, 08, 12, 14
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 7
Step 4 - Rig and Mount the Unit . . . . . . . . . . . . . . . . . 7
Step 6 - Install Accessories . . . . . . . . . . . . . . . . . . . . . 9
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . 14
Preliminary Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 -18
38AUZ Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATING SEQUENCE. . . . . . . . . . . . . . . . . . . . . . . . . . 18
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ROUTINE SYSTEM MAINTENANCE. . . . . . . . . . . . . . . 18
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 18
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 - 23
Comfort Alert Diagnostic Module. . . . . . . . . . . 19 - 21
Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Compressor Protection. . . . . . . . . . . . . . . . . . . . . . . . . . 21
Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . 21
High-Pressure Switches. . . . . . . . . . . . . . . . . . . . . . . . . 21
Outdoor Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Replacing NOVATION Condenser Coil . . . . . . . . . . 22
Field Refrigerant Access Ports . . . . . . . . . . . . . . . . . 22
Factory High-Flow Access Ports . . . . . . . . . . . . . . . . 22
Fastener Torque Values . . . . . . . . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 23, 24
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . 25
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . CL-1, CL-2
Installation, Start-Up and
Service Instructions

SAFETY CONSIDERATIONS

Improper
installation,
adjustment,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service agency,
or your distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the
individual instructions package
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and appropriate national electrical codes
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the
safety-alert symbol
. When you see this symbol on the unit
and in instructions or manuals, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the safety-
alert symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or
operation.
alteration,
service,

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Summary of Contents for Carrier 38AUZ

  • Page 1: Table Of Contents

    START-UP........14 -18 38AUZ Units........14 OPERATING SEQUENCE.

  • Page 2: Installation Guidelines

    ELECTRICAL SHOCK HAZARD Failure to follow this warning could cause personal injury or death. Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch. UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could cause personal injury, death and/or equipment damage.
  • Page 3 38AUZ*07 38AUZ*08 38AUZ*12 38AUZ*14 Corner Corner Corner lbs. lbs. [533.4] [482.6] [584.2] [482.6] Fig. 1 — 38AUZ*07-14 Unit Dimensions Center of Gravity Unit Height 21.00 19.00 13.00 42.36 [482.6] [330.2] [1076.0] 19.00 23.00 13.00 42.36 [584.2] [330.2] [1076.0]...
  • Page 4 Table 1A — Physical Data — 38AUZ*07-14 Units — 60 Hz English UNIT SIZE 38AU NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Aluminum-Fin Coils (Standard) REFRIGERANT TYPE* Operating Charge, Typical (lb)† Shipping Charge (lb) COMPRESSOR Qty...Model Oil Charge (oz) No. Cylinders...
  • Page 5 Table 1B — Physical Data — 38AUZ*07-14 Units — 60 Hz SI UNIT SIZE 38AU NOMINAL CAPACITY (kW) OPERATING WEIGHT (kg) Aluminum-Fin Coils (Standard) REFRIGERANT TYPE* Operating Charge, Typical (kg)† Shipping Charge (kg) COMPRESSOR Qty...Model Oil Charge (L) No. Cylinders...
  • Page 6 3 8 A U Z A 0 4 A 0 G 6 _____________ Model Type 38AU= Carrier Condensing Unit Puronr R--- 410A Refrigerant Type of Coil Z = Single Circuit, A/C Scroll Compressor Refrigerant Options A = None B = Low Ambient...

  • Page 7: Step 1 - Plan For Unit Location

    IMPORTANT: A refrigerant receiver is not provided with the unit. Do not install a receiver. PROVIDE SAFETY RELIEF — The 38AUZ unit is provided with a fusible joint in the suction line in accordance with applicable UL standards for pressure relief. If local codes dictate an additional safety relief device, purchase locally and install locally.
  • Page 8 Determine equivalent line length adjustments for path and components and add to linear line lengths. See Tables 2 and 3; also refer to Part 3 of the Carrier System Design Manual and E20-II® software for design details and line sizing.

  • Page 9: Step 6 - Install Accessories

    LIQUID LINE LIQUID LINE UNIT SIZE (in.) SOLENOID VALVE (LLSV) 38AUZ*07 200RB5T3M 200RB5T3M 38AUZ*08 200RB5T4M 38AUZ*12 200RB6T4M 38AUZ*14 200RB6T5M *Bushings required. LEGEND TXV — Thermostatic Expansion Valve Fig. 5 — Location of Sight Glass(es) and Filter Driers Factory High-Flow Access Port...

  • Page 10: Convenience Outlets

    Locate its disconnect switch, if appropriate, and open it. Tag-out this switch, if necessary. Two types of convenience outlets are offered on 38AUZ models: Non-powered and unit-powered. Both types provide a 125-volt GFCI (ground-fault circuit-interrupter) duplex receptacle rated at 15-A behind a hinged waterproof access cover, located on the end panel of the unit.
  • Page 11 Convenience Outlet GFCI Pwd-CO Fuse Switch Control Box Access Panel Fig. 9 — Convenience Outlet Location Non-powered type: This type requires the field installation of a general-purpose 125-volt 15-A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size, fuse or breaker requirements and disconnect switch size and location.
  • Page 12 Route control wires through the opening in unit’s end panel to the connections terminal board in the unit’s control box. The 38AUZ unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as factory-installed option or as field-installed accessory, for use on a Carrier Comfort Network or as a stand alone control).
  • Page 13 Table 5 — Electrical Data — 38AUZ*07-14 60 Hz Units UNIT FACTORY- SIZE INSTALLED 38AU OPTION NONE OR DISCONNECT CONVENIENCE OUTLET NONE OR DISCONNECT Z*07 CONVENIENCE OUTLET NONE OR DISCONNECT CONVENIENCE OUTLET NONE OR DISCONNECT CONVENIENCE OUTLET NONE OR DISCONNECT...

  • Page 14: Pre-Start-Up

    6. All internal wiring connections must be tight, and all barriers and covers must be in place. NOTE: The 38AUZ units are factory charged with the required amount of oil. If recharging in required, use Emka- rate RL 32-3MAF for the 38AUZ units.
  • Page 15 (ASTP) — Advanced Scroll Temperature Protection (ASTP) is a form of internal discharge temperature protection, used in 38AUZ*12 and 38AUZ*14 units, that unloads the scroll com- pressor when the internal temperature reaches approximately 300°F. At this temperature, an internal bi-metal disk valve opens and causes the scroll elements to separate, which stops compression.
  • Page 16 Fig. 16 — 38AUZ*07 Charging Chart Fig. 17 — 38AUZ*08 Charging Chart Fig. 18 — 38AUZ*12 Charging Chart...
  • Page 17 Fig. 19 — 38AUZ*14 Charging Chart Fig. 20 — 38AU Wiring Diagram...

  • Page 18: Operating Sequence

    OPERATING SEQUENCE Base Unit Controls Indoor (Supply) Fan The indoor fan contactor (IFC) is remotely located at the fan coil or fan section. If the thermostat fan operation is selected as Continuous, the IFC is energized and the indoor (supply) fan motor runs continuously.

  • Page 19: Service

    SERVICE Comfort Alert Diagnostic Module The Comfort Alert Diagnostic Module (CADM) monitors and ® analyzes data from the Copeland Scroll sor 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 20 Table 6 — LED Status Codes Status LED Status LED Description Green “POWER” Module has power Red “TRIP” Thermostat demand signal Y LED On Solid is present, but the compressor is not running. Red “TRIP” LED The anti-short cycle timer (3 minutes), in module is preventing compressor Flashing restart.

  • Page 21: Crankcase Heater

    COMPRESSOR has its own oil supply. Loss of oil due to a leak in the system should be the only reason for adding oil after the system has been in operation. The 38AUZ low-pressure The 38AUZ high-pres- Each fan is supported by a formed-wire...

  • Page 22: Novation™ Coil Cleaning And Maintenance

    NOVATION™ Coil Cleaning and Maintenance — To clean the NOVATION condenser coil, chemicals are NOT to be used; only water is approved as the cleaning solution. Only clean potable water is authorized for cleaning NOVATION condensers. Clean the coil as follows: 1.

  • Page 23: Fastener Torque Values

    SEAT 5/8” HEX FASTENER TORQUE VALUES Compressor mounting bolts Condenser fan motor mounting bolts Condenser fan hub setscrew High-flow service port Schrader-type service check valve PROBLEM COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 2. Fuses blown in field power circuit. 3.
  • Page 24 PROBLEM COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH Indoor-Air Fan Running 1. Liquid line solenoid valve(s) fails to open. 2. Filter drier plugged. 3. Expansion valve power head defective. 4. Low refrigerant charge. Airflow Restricted 1. Coil iced up. 2. Coil dirty. 3.

  • Page 25: Appendix

    APPENDIX AIR CONDITIONER AND HEAT PUMP WITH — ® PURON QUICK REFERENCE GUIDE ® • Puron (R-410A) refrigerant operates at 50 percent to 70 percent higher pressures than R-22. Be sure that servicing equipment and replacement components are ® designed to operate with Puron ®...
  • Page 26 Catalog No: 38AU-01SI Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 03/09 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Replaces: NEW...

  • Page 27: Start-Up Checklist

    I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. INDOOR: AIR HANDLER MANUFACTURER MODEL NO. ADDITIONAL ACCESSORIES II. PRE-START-UP OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT? HAS THE GROUND WIRE BEEN CONNECTED? HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY? ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY?
  • Page 28 INDOOR UNIT LEAVING-AIR WB TEMP COMPRESSOR AMPS (L1/L2/L3) NOTES: Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Printed in U.S.A.

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