Carrier PERFORMANCE 50VT-A User Manual

1
50VT---A
Performancet 14 SEER Single ---Packaged Heat Pump
System with Puron® (R---410A) Refrigerant
Single and Three Phase
2 --- 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )
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.

Carrier PERFORMANCE 50VT-A Specifications

General

Brand	Carrier
Model	PERFORMANCE 50VT-A
Category	Heat Pump
Language	English

Summary

SAFETY CONSIDERATIONS

INTRODUCTION

RECEIVING AND INSTALLATION

Check Equipment

Verify unit model number and serial number against shipping papers.

Provide Unit Support

Install accessory roof curb or concrete pad for unit placement.

Provide Clearances

Ensure adequate ventilation and outdoor air by maintaining minimum service clearances.

RIG AND PLACE UNIT

Inspection

Visually inspect rigging components for damage or wear before initial use.

Rigging/Lifting of Unit

Use top skid as spreader bar, attach shackles to base rails, and ensure unit is lifted level.

SELECT AND INSTALL DUCTWORK

Configuring Units for Downflow Discharge

Steps for converting horizontal discharge units to downflow vertical discharge configurations.

PROVIDE FOR CONDENSATE DISPOSAL

INSTALL ELECTRICAL CONNECTIONS

High-Voltage Connections

Connect field-supplied disconnect switch and ensure proper grounding and wiring.

ELECTRICAL CONNECTIONS - CONTROL VOLTAGE AND SPECIAL PROCEDURES

Control Voltage Connections

Use No. 18 AWG wires for thermostat connections, avoiding power-stealing types.

Special Procedures for 208-V Operation

Procedure to retap the transformer for 208 VAC primary voltage.

PRE-START-UP

Check for Refrigerant Leaks

Locate and repair leaks, then evacuate system to 500 microns.

Start-Up Adjustments

Complete pre-start procedures, do not jumper safety devices, and check compressor rotation.

CHECKING AND ADJUSTING REFRIGERANT CHARGE

Indoor Airflow and Airflow Adjustments

Ensure grilles are open, filters clean, and check system airflow if performance is suspected.

DEFROST CONTROL

Quiet Shift

Field-selectable mode to eliminate defrost cycle noise.

Defrost

Control initiates defrost based on time/temperature, with selectable intervals.

MAINTENANCE

Air Filter

Inspect and clean/replace air filters monthly or when clogged.

Indoor Blower and Motor

Clean accumulated dirt and grease from blower wheel and motor annually.

MAINTENANCE - COIL AND FAN CARE

Outdoor Coil, Indoor Coil, and Condensate Drain Pan

Inspect and clean coils and drain pan annually for obstructions and debris.

Outdoor Fan

Keep the outdoor fan free from obstructions to ensure proper cooling operation.

ELECTRICAL CONTROLS AND WIRING

REFRIGERANT CIRCUIT

PRESSURE SWITCHES

Loss of Charge Switch

Shuts off compressor during low suction pressures; check continuity.

High-Pressure Switch

Protects against excessive condenser coil pressure; opens at 650 psig.

REFRIGERANT SYSTEM

Refrigerant

System uses Puron (R-410A) refrigerant; higher pressures than R-22.

Compressor Oil

Uses 3MAF POE oil; absorbs moisture readily.

Servicing Systems on Roofs with Synthetic Materials

Precautions to protect roofing from POE oil exposure.

Liquid Line Filter Drier

Biflow filter drier must be replaced whenever the system is opened.

SYSTEM INFORMATION

Check Defrost Thermostat

Thermally actuated switch that senses outdoor coil temperature for defrost cycles.

TROUBLESHOOTING

Start-Up Checklist

A list of checks to perform before and during unit start-up.

PURON (R-410A) QUICK REFERENCE GUIDE

TROUBLESHOOTING CHART

START-UP CHECKLIST