Page 1: Table Of Contents
17- - 22 Routine Cleaning of Round-Tube Plate Fin 38AUD Units .......
Page 2: Safety Considerations
38AUD units. potential for personal injury. Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the INSTALLATION GUIDELINE safety-alert symbol.
Page 3 Corner Corner Unit UNIT Center of Gravity Weight Height lbs. lbs. lbs. lbs. lbs. 965.2 mm 495.3 mm 383.3 mm 279.2 mm 38AUD*16 61.5 65.5 38.00 in 19.50 in 15.10 in 50.36 in1 Fig. 1 - - 38AUD*16 Unit Dimensions...
Page 4 Corner Corner Corner Unit UNIT Center of Gravity Weight Height lbs. lbs. lbs. lbs. lbs. 946.1 mm 590.5 mm 383.3 mm 1279.2 mm 38AUD*25 26.5 37.25 in 23.25 in 15.10 in 50.36 in Fig. 2 - - 38AUD*25 Unit Dimensions...
Page 5 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 † Operating Charge A/B, Typical (kg) 6.4/6.4...
Page 6 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 † Operating Charge A/B, Typical (lb) 14.0/14.0...
Page 7: Installation
Fig. 4 - - Serial Number Nomenclature Matching 38AUD To Evaporator Coil – INSTALLATION The Model 38AUD is a dual-circuit unit design that Jobsite Survey requires two sets of refrigeration piping between the outdoor unit and the evaporator coil (or coils). This model Complete the following checks before installation.
Page 8: 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 9: Step 5 - Complete Refrigerant Piping Connections
Check Table 5 for maximum suction tube size for 38AUD units at minimum load conditions. Consider suction speed riser (reduced tube size for vertical segment only) or...
Page 10 Model 38AUD 38AUD units do not include a hot gas stub connection; a tee must be field-supplied and installed in the compressor INSULATE SUCTION LINES — Apply closed-cell discharge line.
Page 11 38AUD, the lower coil circuit expansion valve (TXV) inlets. should be connected to the 38AUD’s Circuit 1 so that the 38AUD units include two Puron-duty filter driers, shipped evaporator’s lower coil segment is first-on/last-off (to avoid in cartons attached to the unit basepan.
Page 12 Failure to follow this warning could cause personal MAKE PIPING CONNECTIONS — Piping connections injury, death and/or equipment damage. at the 38AUD unit are ball valves with stub tube Puron (R- - 410A) refrigerant systems operate at extensions. Do not open the unit service valves until all higher pressure than standard R- - 22 systems.
Page 13: Step 6 - Install Accessories
PRELIMINARY CHARGE — Before starting the unit, charge R-410A liquid refrigerant into the high side of WARNING each 38AUD circuit through the liquid service valve(s). The amount of refrigerant added must be at least 80% of the operating charge listed in Table 4 for LINEAR line...
Page 14 The 38AUD unit requires an external temperature control 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).
Page 15 Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat installation instructions. The 38AUD unit is a two-stage cooling unit. Select a two-stage cooling thermostat. C10079 Fig. 13 - - Control Transformer Wiring...
Page 16 Table 8 – 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...
Page 17: Pre-Start-Up
6. The electrical power source must agree with the unit’s nameplate rating. NOTE: The 38AUD units are factory charged with the required amount of oil. If recharging in required, use 7. The crankcase heater must be firmly attached to the Emkarate RL 32-3MAF for the 38AUD units.
Page 18 ADJUST REFRIGERANT CHARGE — Refer to Cooling Charging Charts, Fig. 16 and Fig. 17. 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.
Page 19 38AUD-16 Charging Chart Puron Circuit 2 All Condenser Fans Operating 150.00 130.00 110.00 90.00 70.00 50.00 30.00 140.00 190.00 240.00 290.00 340.00 390.00 440.00 490.00 540.00 590.00 640.00 Pressure at Liquid Valve (psig) C10082 Fig. 16 - - 38AUD*16 Charging Chart...
Page 20 38AUD-25 Charging Chart Puron Circuit 2 4 Condenser Fans Operating 120.00 110.00 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 140.00 190.00 240.00 290.00 340.00 390.00 440.00 490.00 Pressure at Liquid Valve (psig) C10083 Fig. 17 - - 38AUD*25 Charging Chart...
Page 21 C10084 Fig. 18 - - Typical 38AUD*16 Wiring Diagram...
Page 22 C10085 Fig. 19 - - Typical 38AUD*25 Wiring Diagram...
Page 23: 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.
Page 24: 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 EQUIPMENT DAMAGE HAZARD and 30 days after initial start) Failure to follow this caution may result in damage to equipment.
Page 25: Liquid Line Filter Drier
Manual reset requires that main power to the The Comfort Alert Diagnostic Module (CADM) monitors 38AUD unit be recycled after the cause for the Alert ® and analyzes data from the Copeland Scroll three-phase condition has been detected and corrected.
Page 26 The TRIP LED indicates either a time-delay period is POWER (GRN) currently active (RED LED is blinking) or the module has locked out the compressor (RED LED is on steady). A lockout condition will occur when the CADM detects a thermostat demand at input Y but there is no power at the compressor line terminals T1 or T2 or T3.
Page 27 Table 9 – 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 28: Crankcase Heater
R and C wiring. TRIP LED is on but system Verify Y terminal is wired properly per the 38AUD wiring dia- and compressor check OK gram (see Fig. 18 and Fig. 19). Verify voltage at contactor coil falls below 0.5VAC when off.
Page 29 Condenser Fans/Motors Access Panel - Control Box & Compressors Service Valves C10087 Fig. 22 - - 38AUD Size 16 Cabinet C10095 Fig. 23 - - 38AUD*16 Piping...
Page 30 Condenser Fans/Motors Access Panel - Control Box & Compressors Service Valves C10089 Fig. 24 - - 38AUD Size 25 Cabinet C10090 Fig. 25 - - 38AUD*25 Piping...
Page 31 C10088 Fig. 26 - - 38AUD*16 Compressor Assembly (Rear View) C10091 Fig. 27 - - 38AUD*25 Compressor Assembly (Rear View)
Page 32: Novationtcoil Cleaning And Maintenance
RTPF coils. This cleaner is available from Carrier Replacement parts division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container. It is...
Page 33: Fastener Torque Values
Totaline Environmentally Sound Coil Cleaner soft non-metallic bristle brush may be used. In either Application Equipment case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges gallon garden sprayer can be easily bent over and damage to the coating of S water rinse with low velocity spray nozzle a protected coil) if the tool is applied across the fins.
Page 34 TROUBLESHOOTING PROBLEM SOLUTION COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 1. Restore power. 2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse. 3. No control power. 3. Check control transformer primary connections and circuit breaker. 4.
Page 35: Troubleshooting
TROUBLESHOOTING (cont) PROBLEM SOLUTION COMPRESSOR RUNNING BUT COOLING INSUFFICIENT Suction Pressure Low 1. Refrigerant charge low. 1. Add refrigerant. 2. Head pressure low. 2. Check refrigerant charge. Check outdoor-air fan thermostat settings. 3. Air filters dirty. 3. Clean or replace filters. 4.
Page 36: 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 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 37: Motormaster Sensor Locations
APPENDIX C MOTORMASTER SENSOR LOCATIONS Motormaster Sensor Must be positioned on Vapor Stub Motormaster Sensor 254 mm (10 in) C10093 C10094 Fig. 29 - - Motormaster Sensor Location: Fig. 30 - - Motormaster Sensor Location: 38AUD*16 38AUD*25...
Page 38 Catalog No: 38AU ---C02SI Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Page 39: 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 40 CIRCUIT 2 NOTES: Catalog No: 38AU ---C02SI Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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

Quick Links

Related Manuals for Carrier 38AUD

Summary of Contents for Carrier 38AUD

Table of Contents