Carrier 38AU Fastener Torque Values, Troubleshooting, Problem Solution Compressor does not RUN

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

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 thoroughly cleaned.

10.Finned surfaces should remain wet with cleaning solution for 10 minutes.

11.Ensure surfaces are not allowed to dry before rinsing. Reapply cleaner as needed to ensure 10-minute satur- ation is achieved.

12.Thoroughly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray nozzle. Protect fins from damage from the spray nozzle.

13.Replace top cover and rear corner posts.

FASTENER TORQUE VALUES

Table 13 – Torque Values

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

96 ±10 in–lbs

 

(1085 ±23 N–cm)

 

 

Schrader-type service check valve

2–3 in–lbs

 

(23–34 N–cm)

 

 

Compressor oil sightglass thread

330 ±31 in–lbs

 

(23–34 N–cm)

 

 

Compressor to Compressor rail torque

120–168 in–lbs

 

(1356–1898 N–cm)

 

 

Compressor rail to base pan torque

70 ±5 in–lbs

 

(791 ±57 N–cm)

 

 

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.

Thermostat circuit open.

4.

Check thermostat setting.

5.

Safety device lockout circuit active.

5.

Reset lockout circuit.

6.

Low-pressure switch open.

6.

Check for refrigerant undercharge, obstruction of indoor airflow. Make

 

 

 

sure liquid line solenoid valve(s) is open.

7.

High-pressure switch open.

7.

Check for refrigerant overcharge, obstruction of outdoor airflow, air in system.

 

 

 

Be sure outdoor fans are operating correctly.

8.

Compressor overtemperature switch open.

8. Check for open condition. Allow for reset. Replace compressor if necessary

9.

Loose electrical connections.

9.

Tighten all connections.

10. Compressor stuck.

10. See compressor service literature.

Contactor Closed

 

 

1.

Compressor leads loose.

1.

Check connections.

2.

Motor windings open.

2.

See compressor service literature.

3.

Single phasing.

3.

Check for blown fuse. Check for loose connection at compressor terminal.

 

 

 

COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH

 

 

Outdoor Fan On

 

 

1.

High-pressure switch faulty.

1.

Replace switch.

2.

Reversed fan rotation.

2.

Confirm rotation, correct if necessary.

3.

Airflow restricted.

3.

Remove obstruction.

4.

Air recirculating.

4.

Clear airflow area.

5.

Noncondensables in system.

5.

Recover refrigerant and recharge as required.

6.

Refrigerant overcharge.

6.

Recover refrigerant as required.

7.

Line voltage incorrect.

7.

Consult power company.

8.

Refrigerant system restrictions.

8.

Check or replace filter drier, expansion valve, etc.

Outdoor Fan Off

 

 

1.

Fan slips on shaft.

1.

Tighten fan hub setscrews.

2.

Motor not running.

2.

Check power and capacitor.

3.

Motor bearings stuck.

3.

Replace bearings.

4.

Motor overload open.

4.

Check overload rating. Check for fan blade obstruction.

5.

Motor burned out.

5.

Replace motor.

 

 

 

 

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Contents Installation, Start---Up Service Instructions ContentsReplacement/Retrofit R-22 to PuronR Safety ConsiderationsInstallation Guideline Installation Unit Damage HazardRtpf UnitMchx 38AUZ*25 38AUD*25Unit Size 38AU Refrigerant TYPE‡Compressor Condenser FansPressurestat Settings kPa High Cutout Nominal Capacity kWRtpf Shipping Charge kg ScrollFace Area sq ft total Rows/Fins per inch FPI Rtpf Shipping Charge A/B lbOil Charge A/B oz Operating Weight kg Novation Coil Al Tube Rtpf Shipping Charge A/B kgOil 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 Installation Matching 38AU Model To Evaporator CoilJobsite Survey Do not Bury Refrigeration LinesProvide Safety Relief Slab MountEquivalent Lengths for Common Fittings ft Check 38AU Model with Evaporator Coil Connections38AUZ 16-25 Piping Recommendations Single-Circuit Unit Liquid LiftSuction Riser 38AUD 16-25 Piping Recommendations Two-Circuit Unit Vertical Separation outdoor unit above indoor unitInsulate Suction Lines Hot Gas BypassInstall Filter Driers and Moisture Indicators Refrigerant Specialties Part NumbersInstall Liquid Line Solenoid Valve Capacity Control Liquid Line Solenoid ValveSelecting an Accumulator Make Piping ConnectionsEvacuation/Dehydration Preliminary ChargeField Power Supply Units with Factory-Installed DisconnectFire Hazard 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 VoltagePRE-START-UP START-UPSystem Check Preliminary ChecksAdvanced Scroll Temperature Protection Astp Adjust Refrigerant ChargeUsing plotted operating point 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 ControlsRoutine System Maintenance ServiceRefrigeration System Equipment Damage HazardLiquid Line Filter Drier Field Refrigerant Access PortsFactory High-Flow Access Ports 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 Novation Coil Cleaning and Maintenance Repairing Novation Condenser Tube LeaksCoil Type Identification NOVATIONt TypeUnit Reliability Hazard Routine Cleaning of Round-Tube Plate Fin Rtpf CoilsReplacing NOVATIONt Condenser Coil Troubleshooting Problem Solution Compressor does not RUNCompressor Stops on HIGH-PRESSURE Switch Fastener Torque ValuesProblem Solution Compressor Cycles on LOW-PRESSURE Switch Compressor Running but Cooling InsufficientUnit Operates TOO Long or Continuously System is NoisyAppendix B Wiring Diagram ListAppendix a Low Ambient Option Factory Installed TroubleshootingAppendix C OperationMotormaster Sensor Location 38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 RtpfDimensions --- MM Unit Baffle Wind Baffle DimensionDimensions --- Inches 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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