Carrier 38AU Routine System Maintenance, Service, Refrigeration System, Equipment Damage Hazard

Carrier 38AU appendix Thermostat, Control Transformer Wiring Carrier 38AU appendix Unit Wire/Fuse or Hacr Breaker Sizing Data, Unbalanced 3-Phase Supply Voltage Carrier 38AU appendix Pre-Start-Up, System Check, Preliminary Checks Carrier 38AU Start Unit, Compressor Overload, Advanced Scroll Temperature Protection Astp, Adjust Refrigerant Charge Carrier appendix 38AUZ*25 Check Compressor Oil Level, Final Checks Carrier appendix 38AUD*16 Charging Chart Novation Carrier appendix 38AUZ*16 Charging Chart Rtpf Carrier appendix 38AUD*16 Charging Chart Rtpf Carrier appendix 38AUD*25 Charging Chart Rtpf 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
Page 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 cleanliness checked. S Return air filter replacement

S Outdoor hood inlet filters cleaned S Belt tension checked

S Belt condition checked S Pulley alignment checked

S Fan shaft bearing locking collar tightness checked S Condensate drain checked

Seasonal Maintenance —

These items should be checked at the beginning of each season (or more often if local conditions and usage patterns dictate):

Air Conditioning

S Condenser fan motor mounting bolts tightness S Compressor mounting bolts

S Condenser fan blade positioning

S Control box cleanliness and wiring condition S Wire terminal tightness

S Refrigerant charge level S Evaporator coil cleaning

S Evaporator blower motor amperage

Heating

S Power wire connections

S Fuses ready

SManual-reset limit switch is closed

Economizer or Outside Air Damper

S Inlet filters condition

S Check damper travel (economizer)

S Check gear and dampers for debris and dirt

SERVICE

Refrigeration System

!CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage to equipment.

This system uses PuronR refrigerant which has higher pressures than R-22 and other refrigerants. No other refrigerant may be used in this system. Gage set, hoses, and recovery system must be designed to handle Puron. If you are unsure consult the equipment manufacturer.

Compressor Oil —

!CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage to equipment.

The compressor in a Puron system uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Take all necessary precautions to avoid exposure of the oil to the atmosphere.

Servicing Systems on Roofs With Synthetic Materials —

POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials. Exposure, even if immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more. When performing any service which may risk exposure of compressor oil to the roof, take appropriate precautions to protect roofing. Procedures which risk oil leakage include but are not limited to compressor replacement, repairing refrigerants leaks, replacing refrigerant components such as filter drier, pressure switch, metering device, coil, accumulator, or reversing valve.

Synthetic Roof Precautionary Procedure:

1.Cover extended roof working area with an imper- meable polyethylene (plastic) drop cloth or tarp. Cover an approximate 10 x 10 ft (3.3 x 3.3 m) area.

2.Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and prevent run-offs, and protect drop cloth from tears caused by tools or components.

3.Place terry cloth shop towel inside unit immediately un- der component(s) to be serviced and prevent lubricant run-offs through the louvered openings in the base pan.

4.Perform required service.

5.Remove and dispose of any oil contaminated material per local codes.

38AU

33

Page 32 Page 34
Image 33
Page 32 Page 34
Contents Contents Installation, Start---Up Service InstructionsSafety Considerations Installation GuidelineReplacement/Retrofit R-22 to PuronR Unit Damage Hazard InstallationUnit MchxRtpf 38AUD*25 38AUZ*25Refrigerant TYPE‡ Unit Size 38AUCompressor Condenser FansNominal Capacity kW Pressurestat Settings kPa High CutoutRtpf Shipping Charge kg ScrollRtpf Shipping Charge A/B lb Oil Charge A/B ozFace Area sq ft total Rows/Fins per inch FPI Rtpf Shipping Charge A/B kg Operating Weight kg Novation Coil Al TubeOil Charge A/B L Qty...r/s Motor Hp Nema Diameter mmU Z a 2 5 a 0 G 6 a 0 a 0 a Matching 38AU Model To Evaporator Coil InstallationJobsite Survey Do not Bury Refrigeration LinesSlab Mount Provide Safety ReliefEquivalent Lengths for Common Fittings ft Check 38AU Model with Evaporator Coil ConnectionsLiquid Lift Suction Riser38AUZ 16-25 Piping Recommendations Single-Circuit Unit Vertical Separation outdoor unit above indoor unit 38AUD 16-25 Piping Recommendations Two-Circuit UnitInsulate Suction Lines Hot Gas BypassRefrigerant Specialties Part Numbers Install Filter Driers and Moisture IndicatorsCapacity Control Liquid Line Solenoid Valve Install Liquid Line Solenoid ValveSelecting an Accumulator Make Piping ConnectionsPreliminary Charge Evacuation/DehydrationUnits with Factory-Installed Disconnect Field Power SupplyFire Hazard All UnitsElectrical Operation Hazard Convenience OutletsConvenience Outlet Utilization Notice Label Field Control WiringThermostat Control Transformer WiringUnbalanced 3-Phase Supply Voltage Unit Wire/Fuse or Hacr Breaker Sizing DataSTART-UP PRE-START-UPSystem Check Preliminary ChecksAdjust Refrigerant Charge Advanced Scroll Temperature Protection AstpUsing plotted operating point Start UnitFinal Checks 38AUZ*25 Check Compressor Oil Level38AUD*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 Base Unit Controls Operating SequenceService Routine System MaintenanceRefrigeration System Equipment Damage HazardField Refrigerant Access Ports Factory High-Flow Access PortsLiquid Line Filter Drier Input Terminal Voltage Comfort Alert Diagnostic ModuleLockout LED Status CodesCompressor Protection 38AUD Size 16 Cabinet LPS 38AUZ,D Size 25 Cabinet 38AUZ*25 Compressor Assembly Rear View Repairing Novation Condenser Tube Leaks Novation Coil Cleaning and MaintenanceCoil Type Identification NOVATIONt TypeRoutine Cleaning of Round-Tube Plate Fin Rtpf Coils Replacing NOVATIONt Condenser CoilUnit Reliability Hazard Problem Solution Compressor does not RUN TroubleshootingCompressor Stops on HIGH-PRESSURE Switch Fastener Torque ValuesCompressor Running but Cooling Insufficient Problem Solution Compressor Cycles on LOW-PRESSURE SwitchUnit Operates TOO Long or Continuously System is NoisyWiring Diagram List Appendix aAppendix B Troubleshooting Low Ambient Option Factory InstalledAppendix C Operation38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 Rtpf Motormaster Sensor LocationWind 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 II. PRE-START-UP Outdoor Unit START-UP ChecklistCheck Voltage Imbalance
Top Page Image Contents