Table of Contents
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38AUD
Air Cooled Condensing Units
50 Hz
With Puron
(R---410A) Refrigerant
R
Sizes 07 --- 14
and Service Instructions
CONTENTS
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Installation, Start---Up
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APPENDIX A
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APPENDIX B
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APPENDIX C
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Table of Contents
Related Manuals for Carrier 38AUD
Summary of Contents for Carrier 38AUD
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Page 1: Table Of Contents
38AUD Air Cooled Condensing Units 50 Hz With Puron (R---410A) Refrigerant Sizes 07 --- 14 Installation, Start---Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS .... -
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 19 in 13 in 38AUZ*08 482.6 mm 584.2 mm 330.2 mm 1076.0 mm (MCHX) 19 in 23 in 13 in 38AUD*12 508.0 mm 584.2 mm 381.0 mm 1279.2 mm (MCHX) 20 in 23 in 15 in 38AUD*14 508.0 mm 609.6 mm 381.0 mm...
- Page 5 Table 1A — Physical Data — 38AUZ*07-08 Units — 50 Hz SI UNIT SIZE 38AU Z*07 Z*08 NOMINAL CAPACITY (kW) OPERATING WEIGHTS (kg) NOVATION Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † NOVATION Operating Charge, Typical (kg) NOVATION Shipping Charge (kg) †...
- Page 6 Table 1B — Physical Data — 38AUZ*07-08 Units — 50 Hz English UNIT SIZE 38AU Z*07 Z*08 NOMINAL CAPACITY (tons) OPERATING WEIGHTS (lb) NOVATION Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † NOVATION Operating Charge, Typical (lb) 10.2 NOVATION Shipping Charge (lb) †...
- Page 7 Table 2A — Physical Data — 38AUD*12-14 Units — 50 Hz SI UNIT SIZE 38AU D*12 D*14 NOMINAL CAPACITY (kW) OPERATING WEIGHTS (kg) NOVATION Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † NOVATION Operating Charge A/B, Typical (kg) 3.4 / 3.3...
- Page 8 Table 2B — Physical Data — 38AUD*12-14 Units — 50 Hz English UNIT SIZE 38AU D*12 D*14 NOMINAL CAPACITY (tons) 12.5 OPERATING WEIGHTS (lb) NOVATION Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † NOVATION Operating Charge A/B, Typical (lb) 7.4 / 7.3...
- Page 9 38AUZ circuits into single into a single piping system). piping system Two Circuits The Model 38AUD is a dual-circuit unit design that Use two separate requires two sets of refrigeration piping between the 38AUD piping systems outdoor unit and the evaporator coil (or coils). This model...
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Page 10: Installation
INSTALLATION Step 2 — Complete Pre-Installation Checks Check Unit Electrical Characteristics: Confirm before Jobsite Survey installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with Complete the following checks before installation. power supply provided. 1. -
Page 11: Step 5 - Complete Refrigerant Piping Connections
Longer linear tube lengths components and add to linear line lengths. See Table 4, will also reduce the amount of liquid lift possible. Equivalent Lengths for Common Fittings, for usual fitting Check Tables 5 (38AUZ) and 6 (38AUD) for maximum types. Also identify... - Page 12 Not Recommended (use smaller liquid tube size) Metric units of measure 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.
- Page 13 Table 6 – 38AUD 12-14 50Hz Piping Recommendations (Two-Circuit Unit) NOTE: 38AUD requires TWO sets of refrigeration piping R ---410A Equivalent Length meter 0--- 12 12--- 23 23--- 34 34--- 46 46--- 57 feet 0--- 38 38--- 75 75--- 113...
- Page 14 38AUD, the lower coil circuit units at minimum load conditions. Consider suction speed should be connected to the 38AUD’s Circuit 1 so that the evaporator’s lower coil segment is first-on/last-off (to riser (reduced tube size for vertical segment only) or...
- Page 15 SENSING COIL CKT 2 BULB Every unit MUST have a filter drier in the liquid line. SIGHT GLASS A LOCATION 38AUD models require two filter driers (one in each FILTER DRIER AIRFLOW 15 DIAMS CKT 2 A LOCATION liquid line). Locate the filter drier(s) at the indoor unit, DIAMS close to the evaporator coil’s thermal expansion valve...
- Page 16 Mount the SVR (and transformer TRAN3 when used) in Evacuation/Dehydration — unit control box. Connect per wiring schematic label on Evacuate and dehydrate the connected refrigeration unit or per Fig. 24 (38AUZ) or Fig. 25 (38AUD). system(s) (excluding the 38AU unit) to 500 microns using Capacity Control...
- Page 17 This unit is designed for use with Puron (R- - 410A) Example (using Tables 5 and 6): refrigerant. Do not use any other refrigerant in this Unit 38AUZA08 with Novation coil system. Linear line length 25 m Estimated equivalent line length 37 m (add 50% to linear Puron (R- - 410A) refrigerant is provided in pink (rose) length) colored cylinders.
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Page 18: Step 6 - Install Accessories
Operation on improper line voltage or Do not connect aluminum wire between disconnect excessive phase imbalance constitutes abuse and may switch and condensing unit. Use only copper wire. cause damage to electrical components. Such operation (See Fig. 10.) would invalidate any applicable Carrier warranty. - Page 19 The 38AU unit requires an external temperature control Units Without Disconnect Option device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as a field-installed accessory, for use on a Carrier Comfort Network or as a stand alone control). Disconnect Units With Disconnect Option...
- Page 20 If an integrated economizer function is diagram. required, select a two- - stage cooling thermostat. The 38AUD is a dual- - circuit, two-stage cooling unit. Select a two—stage cooling thermostat. Select a thermostat cable or equivalent single leads of different colors with minimum of four leads for 38AUZ or five leads for 38AUD unit.
- Page 21 400--- 3--- 50 13.5 38AUZ*08 400--- 3--- 50 12.2 16.7 NOTE: See “Legend and Notes for Tables 11 & 12” Table 12 – Electrical Data — 38AUD*12- - 14 50 Hz Units VOLTAGE COMPRESSOR COMPRESSOR POWER DISCONNECT OFM (ea) RANGE...
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Page 22: 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 23: Start Unit
Refer to Cooling Charging Charts, Fig. 17 through Fig. 23. For applications with line lengths greater than 125 ft (38 m), 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 24 C101050 Fig. 17 - - 38AUZ*07 Charging Chart (Novation) C101051 Fig. 18 - - 38AUZ*08 Charging Chart (Novation)
- Page 25 C101052 Fig. 19 - - 38AUD*12 Charging Chart (Novation)
- Page 26 C101053 Fig. 20 - - 38AUD*14 Charging Chart (Novation)
- Page 27 C101054 Fig. 21 - - 38AUZ*07 Charging Chart (RTPF) 7.5 TON CHARGING CHART PURON ALL CONDENSER FANS OPERATING 7.5 TONNE TABLEAU DE CHARGE PURON TOUTES LES SOUFFLERIES DE CONDENSATION EN FONCTIONNEMENT PRESSURE AT LIQUID VALVE (PSIG) PRESSION À LA VANNE DE LIQUIDE (PSIG) C101055 Fig.
- Page 28 C101056 Fig. 23 - - 38AUD*12 Charging Chart (RTPF)
- Page 29 C101013 Fig. 24 - - Typical 38AUZ Wiring Diagram...
- Page 30 C101014 Fig. 25 - - Typical 38AUD Wiring Diagram...
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Page 31: Operating Sequence
As space cooling load is satisfied, thermostat outputs Y2 de-energized and indoor (supply) fan motor stops. and Y1 are de- - energized, removing 24-v at 38AUD terminals Y2 and Y1. Circuit 2 compressor stops on Y2 Cooling, Unit Without Economizer —... -
Page 32: 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 specific CAUTION schedule for each can be identified for this installation: Quarterly Inspection (and 30 days after initial start) — EQUIPMENT DAMAGE HAZARD Indoor section Failure to follow this caution may result in damage to... -
Page 33: 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 service valve and on the liquid tube near the liquid service with desiccant made from 100% molecular sieve grade... -
Page 34: 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. Each compressor has a separate CADM module. The CADM detects causes for electrical and system related failures without any sensors. - Page 35 Table 13 – 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.
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Page 36: Compressor Protection
Table 14 – 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 37 Condenser Fans Service Valves C10927 Fig. 29 - - Typical Exterior, Single- - Circuit Unit (38AUZ*08 shown) Outdoor Coil 32LT Sensor Typical Location High Flow Access Port C10928 Fig. 30 - - Typical Interior, Single- - Circuit Unit (38AUZ*08 shown)
- Page 38 Condenser Fans Service Valves C10929 Fig. 31 - - Typical Exterior, Two- - Circuit Unit (38AUD*14 shown) Outdoor Coil Motormaster Sensor Location High Flow Access Ports C10930 Fig. 32 - - Typical Interior, Two- - Circuit Unit (38AUD*14 shown)
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Page 39: 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 40: Routine Cleaning Of Round-Tube Plate Fin (Rtpf) Coils
RTPF coils. This unit performance. cleaner is available from Carrier Replacement parts division High velocity water from a pressure washer, garden as part number P902-0301 for a 3.8 liter (1 gallon) container,... -
Page 41: 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 15 – 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 42: 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 43: Air Conditioner & Heat Pump With Puron R
APPENDIX A S POE oils absorb moisture rapidly. Do not expose oil to Air Conditioner & Heat Pump with PURON atmosphere. — 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 44: Low Ambient Option - Factory Installed
Fan on/off control in cooling- - only units (38AUZ, for outer fans (OFM1, OFM3) at start or during 38AUD) is provided by an outdoor fan relay (OFR). low outdoor ambient In cooling mode, fan motor speed of outdoor motors Cooling --- Slow fan speed... - Page 45 Sensor Sensor 20 in (508 mm) 10 in (254 mm) C10931 C10932 Fig. 35 - - 38AUZ Motormaster Sensor Location Fig. 36 - - 38AUD*12- - 14 Motormaster Sensor Location (All Sizes - - Novation) (Novation)
- Page 46 C10986 C109XX Fig. 37 - - 38AUZ*07- - 08 Motormaster Sensor Location Fig. 38 - - 38AUZ*12 Motormaster Sensor Location (RTPF) (RTPF)
- Page 47 C101017 Fig. 39 - - Wind Baffles...
- Page 48 1067 LEFT SIDE 1130 1149 1168 38AUZ 08 (MCHX) BACK 1029 1048 1067 LEFT SIDE 1130 1149 1168 1095 1015 38AUD 12 (MCHX) BACK 1029 1048 1067 1095 LEFT SIDE 1130 1149 1168 1095 1015 BACK 1016 1035 1054 1095...
- Page 50 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 ---53380037 ---01 Printed in U.S.A. Form 38AU ---7 ---14 ---C01SI 9 ---19 Replaces 38AU ---C05SI...
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Page 51: 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 52 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 ---53380037 ---01 Printed in U.S.A.