Carrier 50VG Packaged Air Conditioner System Yearly Maintenance

NOTE TO EQUIPMENT OWNER: Consult your local dealer about the availability of a maintenance contract.

WARNING:PERSONAL INJURY AND UNIT DAMAGE HAZARD Failure to follow this warning could result in personal injury or death and possible unit component damage. The ability to properly perform maintenance on this equipment requires certain expertise, mechanical

WARNING:ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow these warnings could result in personal injury or death: 1. Turn off electrical power to the unit and install lockout tag before performing any maintenance or service on this unit. 2. Use extreme

CAUTION:UNIT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation. Errors made when reconnecting wires may cause improper and dangerous operation. Label all wires prior to disconnecting when servicing.

The minimum maintenance requirements for this equipment are as follows:

Air Filter

IMPORTANT: Never operate the unit without a suitable air filter in the return--air duct system. Always replace the filter with the same dimensional size and type as originally installed. See Table 1 for recommended filter sizes.

Indoor Blower and Motor

NOTE: All motors are pre--lubricated. Do not attempt to lubricate these motors. For longer life, operating economy, and continuing efficiency, clean accumulated dirt and grease from the blower wheel and motor annually

WARNING:ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Disconnect and tag electrical power to the unit before cleaning the blower motor and wheel.

To clean the blower motor and wheel:

Remove and disassemble blower assembly as follows:

Remove and clean blower wheel as follows:

MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE

Fig. 16 -- Fan Blade Position

Fig. 17 -- Unit Access Panels

Outdoor Coil, Indoor Coil, and Condensate Drain Pan

OUTDOOR FAN

CAUTION: UNIT OPERATION HAZARD Failure to follow this caution may result in damage to unit components. Keep the condenser fan free from all obstructions to ensure proper cooling operation. Never place articles on top of the unit.

Electrical Controls and Wiring

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

Refrigerant Circuit

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 refrigera

Evaporator Airflow

Puron Items

Pressure Switches

Low--Pressure Switch (Air Conditioner Only)

To check 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 syst

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

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. Po

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 oi

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 othe

Compressor Oil

Servicing Systems on Roofs with Synthetic Materials

Synthetic Roof Precautionary Procedure

Liquid Line Filter Drier

Puron (R--410A) Refrigerant Charging