Carrier 38AU appendix Coil Type Identification, NOVATIONt Type, Round-Tube Plate-Fin Rtpf Type

Carrier appendix Typical 38AUZ Wiring Diagram 15 Ton 230V Tandem Unit Shown Carrier appendix Typical 38AUD Wiring Diagram 15 Ton 230V Dual Unit Shown Carrier 38AU appendix Operating Sequence, Base Unit Controls Carrier 38AU appendix Routine System Maintenance, Service, Refrigeration System, Equipment Damage Hazard Carrier 38AU appendix Liquid Line Filter Drier, Field Refrigerant Access Ports, Factory High-Flow Access Ports Carrier 38AU appendix Comfort Alert Diagnostic Module, Input Terminal Voltage Carrier 38AU appendix LED Status Codes, Lockout Carrier 38AU appendix Compressor Protection Carrier appendix 38AUD Size 16 Cabinet Carrier 38AU appendix Lps Carrier appendix 38AUZ,D Size 25 Cabinet Carrier appendix 38AUZ*25 Compressor Assembly Rear View Carrier 38AU appendix Coil Type Identification, NOVATIONt Type, Round-Tube Plate-Fin Rtpf Type Carrier 38AU appendix Replacing NOVATIONt Condenser Coil, Routine Cleaning of Round-Tube Plate Fin Rtpf Coils Carrier 38AU appendix Fastener Torque Values, Troubleshooting, Problem Solution Compressor does not RUN Carrier 38AU Problem Solution Compressor Cycles on LOW-PRESSURE Switch, Compressor Running but Cooling Insufficient Carrier 38AU appendix Appendix a, Appendix B, Wiring Diagram List Carrier 38AU Appendix C, Low Ambient Option Factory Installed, Operation, Troubleshooting, Speed Control Sensor Resistance Carrier appendix Motormaster Sensor Location, 38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 Rtpf Carrier 38AU appendix Wind Baffle Dimension, Dimensions --- Inches Unit Baffle, Dimensions --- MM Unit Baffle Carrier 38AU appendix Wind Baffles Fabrication Carrier 38AU appendix Ton Wind Baffle Brackets Fabrication Carrier 38AU appendix Front Carrier 38AU appendix Front Back Left Right Carrier appendix Catalog No 38AU---09SI Carrier 38AU appendix START-UP Checklist, II. PRE-START-UP Outdoor Unit Carrier 38AU appendix Check Voltage Imbalance
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38AU

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. The horizontal crosstubes have large diameter aluminum headers on each end. Various optional coatings are also available.

38AU units use two-row segmented coils.

TUBES

FINS

MANIFOLD

MICROCHANNELS

C07273

Fig. 42 - NOVATION Heat Exchanger Coil

Model number designation: See Fig. 3 for general unit model number format. Position 11 indicates the coil type and coating. Position 11 values of G, K, T and W indicate NOVATION coil type is on this unit.

Round-Tube Plate-Fin (RTPF) Type —

This construction uses a series of small diameter copper hairpin tubes running horizontally with vertical plate fins. The plate fins may be aluminum (standard) or copper (optional). Various optional coatings are also available. These coils may be one-row or two-row.

Model number designation: See Fig. 3 for general unit model number format. Position 11 indicates the coil type and coating. Position 11 values of A, B, C, M, N and P indicate RTPF coil type is on this unit.

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 screws holding rear corner posts and top cover in place. Pivot top cover up 12 to 18 in. (305 to 457 mm) and support with a rigid support. See Fig. 43.

C10216

Fig. 43 - Pivot and Support Top Cover

3.Carefully remove any foreign objects or debris at- tached to the coil face or trapped within the mounting frame and brackets.

4.Using a high pressure water sprayer, purge any soap or industrial cleaners from hose and/or dilution tank prior to wetting the coil. Clean condenser face by spraying the coil core steadily and uniformly from top to bottom, directing the spray straight into or toward the coil face. Do not exceed 900 psig or a 45 degree angle; nozzle must be at least 12 in. (30 cm) from the coil face. Reduce pressure and use caution to prevent damage to air centers (fins). Do not fracture the braze between air centers and refrigerant tubes. Allow water to drain from the coil core and check for refrigerant leaks prior to start?up.

5.Replace top cover and rear corner posts.

!CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

Chemical cleaning should NOT be used on the aluminum microchannel (NOVATION) condenser. Damage to the coil may occur. Only approved cleaning is recommended.

Repairing NOVATION Condenser Tube Leaks —

RCD offers service repair kit Part Number 50TJ660007 for repairing tube leaks in the NOVATION coil crosstubes. This kit includes approved braze materials (aluminum fluxcore braze rods), a heat shield, a stainless steel brush, replacement fin segments, adhesive for replacing fin segments, and instructions specific to the NOVATION aluminum coil. See EPIC for instruction sheet 99TA526379.

The repair procedure requires the use of MAPP gas and torch (must be supplied by servicer) instead of conventional

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Contents Installation, Start---Up Service Instructions ContentsSafety Considerations Installation GuidelineReplacement/Retrofit R-22 to PuronR Installation Unit Damage HazardUnit MchxRtpf 38AUZ*25 38AUD*25Compressor Unit Size 38AURefrigerant TYPE‡ Condenser FansRtpf Shipping Charge kg Pressurestat Settings kPa High CutoutNominal Capacity kW ScrollRtpf Shipping Charge A/B lb Oil Charge A/B ozFace Area sq ft total Rows/Fins per inch FPI Oil Charge A/B L Operating Weight kg Novation Coil Al TubeRtpf Shipping Charge A/B kg Qty...r/s Motor Hp Nema Diameter mmU Z a 2 5 a 0 G 6 a 0 a 0 a Jobsite Survey InstallationMatching 38AU Model To Evaporator Coil Do not Bury Refrigeration LinesEquivalent Lengths for Common Fittings ft Provide Safety ReliefSlab Mount Check 38AU Model with Evaporator Coil ConnectionsLiquid Lift Suction Riser38AUZ 16-25 Piping Recommendations Single-Circuit Unit Insulate Suction Lines 38AUD 16-25 Piping Recommendations Two-Circuit UnitVertical Separation outdoor unit above indoor unit Hot Gas BypassInstall Filter Driers and Moisture Indicators Refrigerant Specialties Part NumbersSelecting an Accumulator Install Liquid Line Solenoid ValveCapacity Control Liquid Line Solenoid Valve Make Piping ConnectionsEvacuation/Dehydration Preliminary ChargeFire Hazard Field Power SupplyUnits with Factory-Installed Disconnect All UnitsConvenience Outlets Electrical Operation HazardField Control Wiring Convenience Outlet Utilization Notice LabelControl Transformer Wiring ThermostatUnit Wire/Fuse or Hacr Breaker Sizing Data Unbalanced 3-Phase Supply VoltageSystem Check PRE-START-UPSTART-UP Preliminary ChecksUsing plotted operating point Advanced Scroll Temperature Protection AstpAdjust Refrigerant Charge Start Unit38AUZ*25 Check Compressor Oil Level Final Checks38AUD*16 Charging Chart Novation 38AUZ*16 Charging Chart Rtpf 38AUD*16 Charging Chart Rtpf 38AUD*25 Charging Chart Rtpf Typical 38AUZ Wiring Diagram 15 Ton 230V Tandem Unit Shown Typical 38AUD Wiring Diagram 15 Ton 230V Dual Unit Shown Operating Sequence Base Unit ControlsRefrigeration System Routine System MaintenanceService Equipment Damage HazardField Refrigerant Access Ports Factory High-Flow Access PortsLiquid Line Filter Drier Comfort Alert Diagnostic Module Input Terminal VoltageLED Status Codes LockoutCompressor Protection 38AUD Size 16 Cabinet LPS 38AUZ,D Size 25 Cabinet 38AUZ*25 Compressor Assembly Rear View Coil Type Identification Novation Coil Cleaning and MaintenanceRepairing Novation Condenser Tube Leaks NOVATIONt TypeRoutine Cleaning of Round-Tube Plate Fin Rtpf Coils Replacing NOVATIONt Condenser CoilUnit Reliability Hazard Compressor Stops on HIGH-PRESSURE Switch TroubleshootingProblem Solution Compressor does not RUN Fastener Torque ValuesUnit Operates TOO Long or Continuously Problem Solution Compressor Cycles on LOW-PRESSURE SwitchCompressor Running but Cooling Insufficient System is NoisyWiring Diagram List Appendix aAppendix B Appendix C Low Ambient Option Factory InstalledTroubleshooting OperationMotormaster Sensor Location 38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 RtpfWind Baffle Dimension Dimensions --- Inches Unit BaffleDimensions --- MM Unit Baffle Wind Baffles Fabrication 15 Ton Wind Baffle Brackets Fabrication Front Front Back Left Right Catalog No 38AU---09SI START-UP Checklist II. PRE-START-UP Outdoor UnitCheck Voltage Imbalance
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