Carrier 50VL---A Refrigerant Circuit, Evaporator Airflow, Puron Items, Pressure Switches

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50VL-- A

each electrical component with the proper electrical instrumentation. Refer to the unit wiring label when making these checkouts.

NOTE: Refer to the heating and/or cooling sequence of operation in this publication as an aid in determining proper control operation

Refrigerant Circuit

Inspect all refrigerant tubing connections and the unit base for oil accumulations annually. Detecting oil generally indicates a refrigerant leak.

!WARNING

EXPLOSION, SAFETY AND ENVIRONMENTAL HAZARD

Failure to follow this warning could result in personal injury, death or equipment damage.

This system uses Puron (R-410A) refrigerant which has higher operating pressures than R-22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses, and recovery system must be designed to handle Puron. If you are unsure, consult the equipment manufacturer.

If oil is detected or if low cooling performance is suspected, leak-test all refrigerant tubing using an electronic leak-detector, halide torch, or liquid-soap solution. If a refrigerant leak is detected, refer to Check for Refrigerant Leaks section.

If no refrigerant leaks are found and low cooling performance is suspected, refer to Checking and Adjusting Refrigerant Charge section.

Evaporator Airflow

The heating and/or cooling air-flow does not require checking unless improper performance is suspected. If a problem exists, be sure that all supply- and return-air grilles are open and free from obstructions, and that the air filter is clean. When necessary, refer to Indoor Airflow and Airflow Adjustments section to check the system airflow.

Puron Items

The indoor metering device is a TXV type device.

Pressure Switches

Pressure switches are protective devices wired into the control circuit (low voltage). They shut off compressor if abnormally high or low pressures are present in the refrigeration circuit. These pressure switches are specifically designed to operate with Puron (R-410A) systems. R-22 pressure switches must not be used as replacements for the Puron (R-410A) air conditioner.

Loss of Charge/Low-Pressure Switch (Air Conditioner

Only)

This switch is located on the liquid line and protects against low suction pressures caused by such events as loss of charge, low airflow across indoor coil, dirty filters, etc. It opens on a pressure drop at about 20 psig (957 Pa). If system pressure is above this, switch should be closed.

To check switch:

1.Turn off all power to unit.

2.Disconnect leads on switch.

3.Apply ohmmeter leads across switch. You should have continuity on a good switch.

NOTE: Because these switches are attached to refrigeration system under pressure, it is not advisable to remove this device for troubleshooting unless you are reasonably certain that a problem exists. If switch must be removed, remove and recover all system

charge so that pressure gauges read 0 psi (0 Pa). Never open system without breaking vacuum with dry nitrogen.

High-Pressure Switch

The high-pressure switch is located in the discharge line and protects against excessive condenser coil pressure. It opens at 650 psig (31.1 kPa). High pressure may be caused by a dirty condenser coil, failed fan motor, or condenser air recirculation.

To check switch:

1.Turn off all power to unit.

2.Disconnect leads on switch.

3.Apply ohmmeter leads across switch. You should have continuity on a good switch.

Copeland Scroll Compressor (Puron Refrigerant)

The compressor used in this product is specifically designed to operate with Puron (R-410A) refrigerant and cannot be interchanged.

The compressor is an electrical (as well as mechanical) device. Exercise extreme caution when working near compressors. Power should be shut off, if possible, for most troubleshooting techniques. Refrigerants present additional safety hazards.

!WARNING

FIRE/EXPLOSION HAZARD

Failure to follow this warning could result in personal injury or death and/or property damage.

Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

The scroll compressor pumps refrigerant throughout the system by the interaction of a stationary and an orbiting scroll. The scroll compressor has no dynamic suction or discharge valves, and it is more tolerant of stresses caused by debris, liquid slugging, and flooded starts. The compressor is equipped with a noise reducing shutdown device and an internal pressure relief port. The pressure relief port is a safety device, designed to protect against extreme high pressure. The relief port has an operating range between 550 (26.3 kPa) and 625 (29.9 kPa) psig differential pressure.

Refrigerant

!WARNING

EXPLOSION, ENVIRONMENTAL HAZARD

Failure to follow this warning could result in personal injury, death or equipment damage.

This system uses Puron (R-410A) refrigerant which has higher operating pressures than R-22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses, and recovery system must be designed to handle Puron. If you are unsure, consult the equipment manufacturer.

This system uses Puron (R-410A) refrigerant which has higher operating pressures than R-22 and other refrigerants. No other refrigerant may be used in this system. Gage set, hoses, and recovery system must be designed to handle Puron. If you are unsure, consult the equipment manufacturer. Failure to use Puron compatible servicing equipment or replacement components may result in property damage or injury.

Compressor Oil

The Copeland scroll compressor uses 3MAF POE oil. If additional oil is needed, use Uniqema RL32-3MAF. If this oil is not available, use Copeland Ultra 32 CC or Mobil Arctic EAL22 CC. This oil is extremely hygroscopic, meaning it absorbs water

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Contents Table of Contents Safety ConsiderationsCheck Equipment Receiving and InstallationIntroduction Provide Unit Support50VL-A24-36 Unit Dimensions 50VL-A42-60 Unit Dimensions CPRFCURB011A00 SizeCPRFCURB010A00 CPRFCURB012A0050VL-A Unit Suggested Rigging Small Cabinet Large CabinetRig and Place Unit Provide ClearancesField-Fabricate Ductwork InspectionConnect Condensate Drain Install Duct ConnectionsConfiguring Units for Downflow Vertical Discharge Unit Component Damage Hazard Install Electrical ConnectionsHIGH-VOLTAGE Connections Standard Connection Special Procedures for 208-V OperationControl Voltage Connections Transformer ProtectionPhysical Data-Unit 50VL-A Minimum Airflow for Safe Electric Heater Operation CFMSTART-UP Start-Up Cooling Section And Make AdjustmentsPRE-START-UP Check for Refrigerant LeaksIndoor Airflow and Airflow ADJUST- Ments Unit Operation HazardCooling Sequence of Operation Single Speed Cooling with Higher Electric Heat SpeedContinuous FAN Operation Color Coding for Indoor Fan Motor LeadsUnit Motor Speed Wire Color Dry Coil Air Delivery Downflow DischargeLarge Cabinet Horizontal and Downflow Filter Pressure Drop Table IN. W.CElectric Heat Pressure Drop Tables IN. W.C Small Cabinet Unit Standard CFM Scfm Size50VL a Cont. Ladder Wiring Diagram 208/230-1-60 Connection Wiring Diagram 208/230-3-60 Cont. Ladder Wiring Diagram 208/230-3-60 Connection Wiring Diagram 50VL500271 Cooling Charging Chart Indoor Blower and Motor MaintenanceAir Filter Personal Injury and Unit Damage HazardOutdoor FAN Electrical Controls and WiringOutdoor Coil, Indoor Coil, and Condensate Drain Pan High-Pressure Switch Pressure SwitchesLoss of Charge/Low-Pressure Switch Air Conditioner Only Refrigerant CircuitTroubleshooting START-UP ChecklistTroubleshooting Chart Symptom Cause RemedyAIR Conditioner with Puron R-410A Quick Reference Guide Preliminary Information Model no TemperaturesRemove and Store in Job Files III. START-UP Electrical Supply Voltage Compressor Amps

50VL---A specifications

The Carrier 50VL---A is a powerhouse in the field of air conditioning and heating solutions, designed for residential and commercial applications. This unit exemplifies Carrier’s commitment to efficiency, reliability, and advanced technology. One of the standout features of the 50VL---A is its superior energy efficiency, which is reflected in its high Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF) ratings. These ratings ensure reduced energy consumption and lower utility bills, making it an environmentally friendly choice.

The 50VL---A is designed with a robust scroll compressor that not only enhances performance but also minimizes noise levels during operation. This compressor is integral to the system’s ability to maintain a consistent temperature and humidity level within the space. The unit’s sound-dampening features contribute to a quieter environment, which is particularly important in residential settings.

One of the key technologies integrated into the Carrier 50VL---A is the advanced microprocessor control system. This technology allows for precise temperature adjustments and operational diagnostics, making maintenance easier and more efficient. This system ensures that the unit operates at optimal performance, adapting to changing environmental conditions with ease.

Moreover, the 50VL---A is equipped with a multi-speed blower motor that provides enhanced airflow and comfort. This feature allows users to select different cooling or heating levels according to their specific requirements, promoting customized comfort throughout the home or office.

In addition to its performance capabilities, the Carrier 50VL---A is also built with longevity and durability in mind. The cabinet is constructed from high-quality materials that offer resistance to corrosion and wear, ensuring the unit can withstand various weather conditions over time. Furthermore, the unit’s maintenance-friendly design allows for easy access to key components, simplifying servicing and prolonging the life of the system.

Overall, the Carrier 50VL---A stands out as a reliable and advanced solution for climate control. With its energy-efficient operation, quiet performance, and user-friendly features, it represents a significant investment in home comfort and efficiency. Whether for heating during the colder months or cooling in the summer, the 50VL---A delivers exceptional performance, making it a popular choice among users seeking quality HVAC solutions.
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