Check Voltage Imbalance | Carrier 38AU instruction

38AU

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 ASSISTANCE.

CHECK INDOOR UNIT FAN SPEED AND RECORD.

CHECK OUTDOOR UNIT FAN SPEED AND RECORD.

AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:

SUCTION PRESSURE

CIR 1:

CIR 2:

SUCTION LINE TEMP

CIR 1:

CIR 2:

LIQUID PRESSURE

CIR 1:

CIR 2:

LIQUID LINE TEMP

CIR 1:

CIR 2:

ENTERING OUTDOOR UNIT AIR TEMP

LEAVING OUTDOOR UNIT AIR TEMP

INDOOR UNIT ENTERING-AIR DB (dry bulb) TEMP

INDOOR UNIT ENTERING-AIR WB (wet bulb) TEMP

INDOOR UNIT LEAVING-AIR DB TEMP

INDOOR UNIT LEAVING-AIR WB TEMP

COMPRESSOR 1 AMPS (L1/L2/L3)

/

/

COMPRESSOR 2 AMPS (L1/L2/L3)

/

/

NOTES:

Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231	Printed in U.S.A.	Edition Date: 11/10	Catalog No: 38AU---09SI

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.			Replaces: 38AU--- 07SI

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Carrier 38AU appendix Check Voltage Imbalance

Contents

Installation, Start---Up Service Instructions Contents Replacement/Retrofit R-22 to PuronR Safety ConsiderationsInstallation Guideline Installation Unit Damage Hazard Rtpf UnitMchx 38AUZ*25 38AUD*25 Unit Size 38AU Refrigerant TYPE‡Compressor Condenser Fans Pressurestat Settings kPa High Cutout Nominal Capacity kWRtpf Shipping Charge kg Scroll Face 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 mm U 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 Lines Provide Safety Relief Slab MountEquivalent Lengths for Common Fittings ft Check 38AU Model with Evaporator Coil Connections 38AUZ 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 Bypass Install Filter Driers and Moisture Indicators Refrigerant Specialties Part Numbers Install Liquid Line Solenoid Valve Capacity Control Liquid Line Solenoid ValveSelecting an Accumulator Make Piping Connections Evacuation/Dehydration Preliminary Charge Field Power Supply Units with Factory-Installed DisconnectFire Hazard All Units Convenience Outlets Electrical Operation Hazard Field Control Wiring Convenience Outlet Utilization Notice Label Control Transformer Wiring Thermostat Unit Wire/Fuse or Hacr Breaker Sizing Data Unbalanced 3-Phase Supply Voltage PRE-START-UP START-UPSystem Check Preliminary Checks Advanced Scroll Temperature Protection Astp Adjust Refrigerant ChargeUsing plotted operating point Start Unit 38AUZ*25 Check Compressor Oil Level Final Checks 38AUD*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 Controls Routine System Maintenance ServiceRefrigeration System Equipment Damage Hazard Liquid Line Filter Drier Field Refrigerant Access PortsFactory High-Flow Access Ports Comfort Alert Diagnostic Module Input Terminal Voltage LED Status Codes Lockout Compressor 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 Type Unit 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 Values Problem Solution Compressor Cycles on LOW-PRESSURE Switch Compressor Running but Cooling InsufficientUnit Operates TOO Long or Continuously System is Noisy Appendix B Wiring Diagram ListAppendix a Low Ambient Option Factory Installed TroubleshootingAppendix C Operation Motormaster Sensor Location 38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 Rtpf Dimensions --- 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 Unit Check Voltage Imbalance