Carrier installation instructions Table Of Contents, Safety Considerations, Unit 50VT-A

50VT---A

Performancet 14 SEER Single---Packaged Heat Pump 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
INTRODUCTION	. . . 2
RECEIVING AND INSTALLATION	. 2-9
Check Equipment	. . . 2
Identify Unit	. . . 2
Inspect Shipment	. . . 2
Provide Unit Support	. . . 2
Roof Curb	. . . 2
Slab Mount	. . . 2
Provide Clearances	. . . 2
Rig and Place Unit	. . . 6
Inspection	. . . 6
Rigging/Lifting of Unit	. . . 6
Select and Install Ductwork	. . . 7
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units	. . . 7
Provide for Condensate Disposal	. . . 8
Install Electrical Connections	. . . 8
High-Voltage Connections	. . . 8
Special Procedures for 208-V Operation	. . . 9
Control Voltage Connections	. . . 9
Standard Connections	. . . 9
Transformer Protection	. . . 9
Accessory Electric heaters Installation	. . . 9
Sequence of Operation	. . . 9
PRE-START-UP	. . 17
START-UP	17-20
Checking Cooling & Heating Control Operation	. . 17
Check for Refrigerant Leaks	. . 17
Start-Up Adjustments	. . 17
Checking & Adjusting Refrigerant Charge	. . 18
Indoor Airflow & Airflow Adjustments	. . 18
Continuous Fan Operation	. . 19
Defrost Control	. . 20
Quiet Shift	. . 20
Defrost	. . 20
MAINTENANCE	23-28
Air Filter	. . 23
Indoor Blower and Motor	. . 23
Outdoor Coil, Indoor Coil, & Condensate Drain Pan . . . .	. . 26
Outdoor Fan	. . 26
Electrical Controls and Wiring	. . 26
Refrigerant Circuit	. . 26
Indoor Airflow	. . 26
Metering Devices- TXV & Piston	. . 26
Pressure Switches	. . 27
Loss of Charge Switch	. . 27
High Pressure Switch	. . 27

A09033

Fig. 1 - Unit 50VT-A

Copeland Scroll compressor (Puron Refrigerant) . . . . . . . . . 27 Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Servicing Systems on Roofs with Synthetic Materials . . . . 27 Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 PuronR (R-410A) Refrigerant Charging . . . . . . . . . . . . . 28 System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Loss of Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . 28 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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. Use quenching cloth for brazing operations. 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 Electrical Code (NEC) NFPA 70.

In Canada refer to the current editions of the Canadian Electrical Code CSA C22.1.

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