Carrier 38AUZ- Manuals

11 Matching 38AU Model To Evaporator Coil The Model 38AUZ is a single-circuit unit design, requiring one set of refrigeration piping. This model can be connected to an evaporator coil with one circuit or with two circuits (by manifolding the evaporator connections into a single piping system). The M...

12 Step 3 — Prepare Unit Mounting Support Slab Mount — Provide a level concrete slab that extends a minimum of 6 in. (150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow. Step 4 — Rig and Mount the Unit UNIT D...

13 Enter the appropriate table to select the recommended line sizes. Model: Line Sizes Table Quantity of Line Sets 38AUZ 5 1 38AUD 6 2 Liquid Lift — A liquid lift condition exists when the outdoor unit is located below the indoor (evaporator) unit and liquid flows vertically up in a portion of the l...

14 Table 6 – 38AUD 16-25 Piping Recommendations (Two-Circuit Unit) NOTE : 38AUD requires TWO sets of refrigeration piping R-410A Equivalent LengthFt 0-38 38-75 75-113 113-150 150-188 m 0-12 12-23 23-34 34-46 46-57 Model Linear LengthFt 0-25 25-50 50-75 75-100 100-125 m 0-8 8-15 15-23 23-30 30-38 38A...

15 Circuit 1 Connections Circuit 2 Connections CKT 1 CKT 1 CKT 2 CKT 2 C10355 Fig. 6 -- 38AUD Service Valve Locations Plan the Circuit 1 and Circuit 2 tubing segments carefully, mark each segment and check constantly as piping systems are assembled to avoid piping errors. 38AUD unit cannot be field-...

16 INDOOR COIL CKT 2 AIRFLOW INDOOR COIL CKT 1 AIRFLOW 15 DIAMS MIN 10 DIAMS 8 DIAMS MIN TXV SENSING BULB EQUALIZER LINE SIGHT GLASS A LOCATION SIGHT GLASSES B LOCATION TXV CKT 2 FILTER DRIER A LOCATION FILTER DRIERS B LOCATION FLOW TXV SENSING BULB TXV CKT 1 8 DIAMS MIN 15 DIAMS MIN 10 DIAMS Single...

17 The stub tube connections include 1 / 4 -in SAE service fittings with Schrader valve cores (see Fig. 10). Before making any brazed connections to the unit service valves, remove both Schrader valve caps and cores and save for re-installation. Connect a source for nitrogen to one of these service ...

18 Step 7 — Complete Electrical Connections ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death.Do not use gas piping as an electrical ground. Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injur...

19 11 13 L1 L2 L3 C TB1 208/230-3-60 460-3-60575-3-60 Units Without Disconnect Option Units With Disconnect Option 2 4 6 1 3 5 L1 L2 L3 Optional Disconnect Switch Disconnect factory test leads; discard. Factory Wiring Disconnect per NEC C10204 Fig. 12 -- Power Wiring Connections Affix the crankcase ...

20 B 50HJ542739 Maximum Continuous use : 8 Amps 24/7 Convenience Outlet Utilization NOTICE C10207 Fig. 15 -- Convenience Outlet Utilization Notice Label Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle. Check for proper grounding wire...

22 Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data UNIT SIZE 38AU NOMINAL POWER SUPPLY VOLTAGE RANGE COMPRESSOR NO C.O. or UNPWRD C.O. No. 1 No. 2 OFM POWER SUPPLY DISCONNECT SIZE V --- Ph --- Hz Min Max RLA LRA RLA LRA Qty FLA (ea) MCA FUSE or HACR BRKR FLA LRA D*16 Z*16 208/230 ---3 ---60 18...

23 PRE-START-UP IMPORTANT : Before beginning Pre-Start-Up or Start-Up, review Start-Up Checklist at the back of thisbook. The Checklist assures proper start-up of a unitand provides a record of unit condition, applicationrequirements, system information, and operation atinitial start-up. UNIT DAMAGE...

24 Compressor Overload — This overload interrupts power to the compressor when either the current or internal motor winding temperature becomes excessive, and automatically resets when the internal temperature drops to a safe level. This overload may require up to 60 minutes (or longer) to reset. If...

32 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. If the thermostat fan...

33 ROUTINE SYSTEM MAINTENANCE These items should be part of a routine maintenance program, to be checked every month or two, until a specific schedule for each can be identified for this installation: Quarterly Inspection (and 30 days after initial start) — Indoor section S Condenser coil cleanlines...

34 Liquid Line Filter Drier — The factory-provided filter drier is specifically designed to operate with Puron ® . Replace the filter drier with factory-authorized components only with a filter drier with desiccant made from 100% molecular sieve grade XH-11. Filter drier must be replaced whenever th...

35 Comfort Alert Diagnostic Module 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 m...

36 Table 11 – LED Status Codes Status LED Status LED Description Status LED Troubleshooting Information Green “POWER” Module has power Supply voltage is present at module terminals Red “TRIP” LED On Solid Thermostat demand signal Y is present, but the com- pressor is not running. 1. Compressor prote...

37 Table 12 – CADM Troubleshooting Miswired Module Indication Recommended Troubleshooting Action Green LED is not on, module does not power up Determine if both R and C module terminals are connected. Verify voltage in present at module’s R and C terminals. NOTE: The CADM requires a constant nominal...

38 Condenser Fans/Motors ServiceValves Access Panel -Control Box &Compressors C10087 Fig. 34 -- 38AUD Size 16 Cabinet C10095 Fig. 35 -- 38AUD*16 Piping 38A U

42 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. NOVATION t Type — The new NOVATION Heat Exchanger Technology is an all--alumin...

44 7. Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid spraying in horizontal pattern to minimize po- tential for fin damage. 8. Ensure cleaner thoroughly penetrates deep into finned areas. 9. Interior and exterior finned areas must be tho...

46 APPENDIX A Air Conditioner & Heat Pump with PURON ® — Quick Reference Guide S Puron ® (R-410A) refrigerant operates at 50 percent to 70 percent higher pressures than R-22. Be sure thatservicing equipment and replacement components aredesigned to operate with Puron ® . S Puron ® refrigerant cy...

47 APPENDIX C Low Ambient Option — Factory Installed Units with the factory installed low ambient option are equipped with a Motormaster R solid--state head pressure control which regulates fan speed. A temperature sensor, mounted on circuit 1 of the outdoor coil (see Figs. 44 and 45) controls the s...

49 Table 14 – Wind Baffle Dimension DIMENSIONS --- INCHES UNIT BAFFLE A B C D E F G H J 38AUZ*16 38AUD*16 (MCHX) LEFT SIDE 19 3 / 4 20 1 / 2 21 1 / 4 43 1 / 8 8 3 / 8 18 27 1 / 4 40 --- BACK 80 1 / 4 81 81 3 / 4 43 1 / 8 8 3 / 8 18 27 1 / 4 40 --- RIGHT SIDE 38 3 / 4 39 1 / 2 40 1 / 4 43 1 / 8 8 3 /...

52 RIGHT BACK LEFT FRONT BOTT OM BRACKET T O P BRACKETS C 10367 Fig. 48 -- W ind Baf fl e Inst allat ion — 15 Ton Unit s 38A U

56 CHECK VOLTAGE IMBALANCE LINE-TO-LINE VOLTS: AB V AC V BC V (AB + AC + BC)/3 = AVERAGE VOLTAGE = V MAXIMUM DEVIATION FROM AVERAGE VOLTAGE = V VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) = IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM! CALL LOCAL POWER COMPANY FOR ASS...

9 Table 4 — Refrigerant Specialities Part Numbers. Fig. 5 — Location of Sight Glass(es) and Filter Driers Fig. 6 — Typical Piping Connection Assembly Pressure-test all joints from outdoor unit connections over to the evaporator coil, using nitrogen as pressure and with soap- and-bubbles.When pressur...

10 leads according to required operation of the convenience outlet. If an always-energized convenience outlet operation is desired, connect the source leads to the line side of the unit-mounted disconnect. (Check with local codes to ensure this method is acceptable in your area.) If a de-energize vi...

11 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 switc...

12 Fig. 11 — Weatherproof Cover Installation All Units — Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. See Table 5. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in t...

17 Fig. 19 — 38AUZ*14 Charging Chart Fig. 20 — 38AU Wiring Diagram

18 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. If the thermostat fan o...

19 SERVICE Comfort Alert Diagnostic Module The Comfort Alert Diagnostic Module (CADM) monitors and analyzes data from the Copeland Scroll ® three-phase compres- sor and the thermostat demand. The CADM also provides a 3-minute anti-recycle time delay to compressor cycling.The CADM detects causes for ...

20 Table 6 — LED Status Codes Status LED Status LED Description Status LED Troubleshooting Information Green “POWER” Module has power Supply voltage is present at module terminals Red “TRIP” LED On Solid Thermostat demand signal Y is present, but the compressor is not running. 1. Compressor protecto...

21 Table 7 — CADM Troubleshooting Crankcase Heater — The heater prevents refrigerant migration and compressor oil dilution during shutdown when- ever compressor is not operating. The heater is wired to cycle with the compressor; the heater is off when compressor is run- ning, and on when compressor ...

22 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. Turn off unit power.2. Remove screw...

23 Fig. 22 — CoreMax Access Port Assembly FASTENER TORQUE VALUES Table 8 — Torque Values TROUBLESHOOTING Compressor mounting bolts 65–75 in–lbs (734–847 N–cm) Condenser fan motor mounting bolts 20 ±2 in–lbs (226 ±23 N–cm) Condenser fan hub setscrew 84 ±2 in–lbs (949 ±136 N–cm) High-flow service port...

25 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 ® . • Puron ® refrigerant cyli...

CL-1 III. START UP START-UP CHECKLIST I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIR HANDLER 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) CH...