Carrier 48EZ(N)-A installation instructions Table of Contents, Safety Considerations

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48EZ(N)---A

Comfort t 13 SEER Single---Packaged HYBRID HEATr Dual Fuel System with Puron® (R---410A) Refrigerant Single and Three Phase

2---5 Nominal Tons (Sizes 24---60)

Installation Instructions

NOTE: Read the entire instruction manual before starting the installation.

NOTE: Installer: Make sure the Owner’s Manual and Service Instructions are left with the unit after installation.

TABLE OF CONTENTS

 

 

PAGE

SAFETY CONSIDERATIONS

. 1-2

INTRODUCTION

. . . 2

RECEIVING AND INSTALLATION

2-13

Check Equipment

. . . 2

Identify Unit

. . . 2

Inspect Shipment

. . . 2

Provide Unit Support

. . . 2

Roof Curb

. . . 2

Slab Mount

. . . 2

Field Fabricate Ductwork

. . . 6

Provide Clearances

. . . 6

Rig and Place Unit

. . . 6

Connect Condensate Drain

. . . 7

Install Flue Hood

. . . 7

Install Gas Piping

. . . 7

Install Duct Connections

. . . 9

Configuring Units for Downflow (Vertical)

 

Discharge

. . . 9

Install Electrical Connections

. . 12

High-Voltage Connections

. . 12

Special Procedures for 208-V Operation

. . 12

Control Voltage Connections

. . 13

Balance Point Setting Thermidistat or Hybrid Heat

 

Thermostat

. . 13

Transformer Protection

. . 13

PRE-START-UP

13-14

START-UP

14-17

Check for Refrigerant Leaks

. . 14

Unit Sequence of Operation

. . 14

Start-Up Heating and Make Adjustments

. . 14

Checking Heating Control

. . 14

Check Gas Input

. . 15

Adjust Gas Input

. . 15

Check Burner Flame

. . 16

Start-Up Cooling and Make Adjustments

. . 16

Checking Cooling Control Operation

. . 16

Checking and Adjusting Refrigerant

. . 17

Indoor Airflow and Airflow Adjustments

. . 17

MAINTENANCE

32-38

Air Filter

. . 32

Indoor Blower and Motor

. . 32

Flue Gas Passageways

. . 33

Limit Switch

. . 33

Burner Ignition

. . 33

Main Burners

. . 33

Outdoor Coil, Indoor Coil, & Condensate Drain Pan . . . .

. . 33

Outdoor Fan

. . 34

Electrical Controls and Wiring

. . 34

Refrigerant Circuit

. . 34

A09034

Fig. 1 - Unit 48EZ-A

Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

PuronR Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

SAFETY CONSIDERATIONS

Installation and servicing of this equipment can be hazardous due to mechanical and electrical components. Only trained and qualified personnel should install, repair, or service this equipment.

Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on this equipment, observe precautions in the literature, on tags, and on labels attached to or shipped with the unit and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70.

In Canada refer to the current editions of the National Standards of Canada CAN/CSA-B149.1 and .2 Natural Gas and Propane Installation codes, and Canadian Electrical Code CSA C22.1.

Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manu- als, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in per- sonal injury or death. CAUTION is used to identify unsafe practic-

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Contents Safety Considerations Table of ContentsIntroduction Receiving and InstallationCheck Equipment Provide Unit Support48EZ-A24-36 Unit Dimensions 48EZ-A42-60 Unit Dimensions Number Roof Curb DimensionsProvide Clearances Field Fabricate DuctworkRig and Place Unit InspectionInstall Gas Piping Install Flue HoodConnect Condensate Drain Rigging/Lifting of Unit See FigSediment Trap Fire or Explosion HazardConfiguring Units for Downflow Vertical Discharge Install Duct ConnectionsPhysical Data Unit 48EZ-A Maximum Gas Flow Capacity Physical Data Unit 48EZ-A Cont’dHeating Inputs Special Procedures for 208-V Operation Install Electrical ConnectionsHigh-Voltage Connections Unit Component Damage HazardPRE-START-UP Balance Point Setting-Thermidistat or Hybrid ThermostatControl Voltage Connections Transformer ProtectionSTART-UP Start-up Heating and Make Adjust- mentsCheck for Refrigerant Leaks Unit Sequence of OperationCheck Gas Input Adjust Gas InputUnit Damage Hazard Start-up Cooling and Make Adjust- ments Indoor Airflow and Airflow Adjustments Checking and Adjusting Refrigerant ChargeGas Heating Fan Speed Set-up Unit Operation HazardContinuous Fan Operation Two Cooling Fan Speeds Set-up Dehumidification feature usedColor Coding for Indoor Fan Motor Leads Unit Heating Rise Motor Dry Coil Air Delivery* Horizontal Unit 48EZ-A24-60Range Speed Color Dry Coil Air Delivery* Horizontal Discharge Unit 48EZ-A24-60 1354 1290 1226 1158 1102 1046 981 918 843 55oF Heating Rise Medium1 48EZ ---,NA48090 48EZ ---,NA48130 Unit Heating Rise Motor Wire Unit Standard CFM Scfm Size Horizontal and Downflow Filter Pressure Drop Table IN. W.CDownflow Cooling Standard CFM Scfm Economizer + Tons Cooling Standard CFM Scfm48EZ a 208/230-1-60 Ladder Wiring Diagram, Unit 48EZ-A 208/230-3-60 Connection Wiring Diagram, Unit 48EZ-A Cont. 208/230-3-60 Ladder Wiring Diagram, Unit 48EZ-A Cooling Charging Table-Subcooling Cleaning the Blower Motor and Wheel MaintenanceAir Filter Indoor Blower and MotorInduced Draft combustion air Blower Assembly Limit SwitchBurner Ignition Main BurnersOutdoor Fan Electrical Controls and WiringRefrigerant Circuit Loss of Charge Switch Pressure SwitchesGas Input Indoor AirflowCopeland Scroll Compressor Puron Refrigerant High-Pressure SwitchExplosion Hazard Refrigerant System Unit Operation and Safety HazardCompressor Oil START-UP Checklist TroubleshootingPuronr R-410A Quick Reference Guide Symptom Cause Remedy Troubleshooting Guide Cooling or Heat Pump Heating ModeTroubleshooting Guide-LED Error Codes Troubleshooting Guide-HeatingLED OFF Remove and Store in Job Files TemperaturesPreliminary Information Model no III. START-UP Electrical Supply Voltage Compressor Amps
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