Carrier 48VT(N) installation instructions Table Of Contents, Safety Considerations, Unit 48VT-A

48VT(N)---A

Performancet 14 SEER Single---Packaged HYBRID HEAT®

Dual Fuel System with Puronr (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
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	. . . 2
Provide Clearances	. . . 2
Rig and Place Unit	. . . 6
Connect Condensate Drain	. . . 7
Install Flue Hood	. . . 7
Install Gas Piping	. . . 7
Install Duct Connections	. . . 8
Configuring Units for Downflow (Vertical)
Discharge	. . . 8
Install Electrical Connections	. . 11
High-Voltage Connections	. . 11
Special Procedures for 208-V Operation	. . 11
Control Voltage Connections	. . 11
Balance Point Setting Thermidistat or Hybrid Heat
Thermostat	. . 12
Transformer Protection	. . 12
PRE-START-UP	. . 12
START-UP	13-17
Check for Refrigerant Leaks	. . 13
Unit Sequence of Operation	. . 13
Start-Up Heating and Make Adjustments	. . 13
Checking Heating Control	. . 14
Check Gas Input	. . 14
Adjust Gas Input	. . 14
Check Burner Flame	. . 15
Start-Up Cooling and Make Adjustments	. . 16
Checking Cooling Control Operation	. . 16
Checking and Adjusting Refrigerant	. . 16
Indoor Airflow and Airflow Adjustments	. . 16
Continuous Fan Operation	. . 17
MAINTENANCE	27-33
Air Filter	. . 27
Indoor Blower and Motor	. . 27
Flue Gas Passageways	. . 28
Limit Switch	. . 28
Burner Ignition	. . 28
Main Burners	. . 28
Outdoor Coil, Indoor Coil, & Condensate Drain Pan . . . .	. . 28

A09042

Fig. 1 - Unit 48VT-A

Outdoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . . 29

Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

PuronR Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have a 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

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