Carrier 48VR Packaged Hybrid Heat® System Yearly Miantenance

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

WARNING: ELECTRICAL SHOCK HAZARD Failure to follow these warnings could result in personal injury or death:

1. Turn off electrical power to the unit and install lock out tag before performing any maintenance or service on this unit.

2. Use extreme caution when removing panels and parts.

3. Never place anything combustible either on or in contact with the unit.

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

CAUTION;ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental pollution. Remove and re--cycle all components or materials (i.e. oil, refrigerant, etc) before unit final disposal.

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:

Induced Draft (combustion air) Blower Assembly

To inspect blower wheel, remove draft hood assembly. Shine a flashlight into opening to inspect wheel. If cleaning is required, remove induced--draft blower assembly as follows:

Flue Gas Passageways

To inspect the flue collector box and upper areas of the heat exchanger:

Limit Switch

Remove blower access panel (see Fig. 20). Limit switch(es) are located on the fan partition.

Burner Ignition

Main Burners

Removal of Gas Train

To remove the gas train for servicing:

WARNING: FIRE, EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death or property damage. Do not purge gas supply into the combustion chamber. Do not use a match or other open flame to check for gas leaks. Use a commerciall

Outdoor Coil, Indoor Coil, and Condensate Drain Pan

Fig. 19 -- Blower Housing and Flue Collector Box

Fig. 20 -- Unit Access Panels

Fig. 21 -- Removal of Motor and Blower Wheel

Fig. 22 -- Burner Rack Removed

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

Refrigerant Circuit

Annually inspect all refrigerant tubing connections and the unit base for oil accumulations.

WARNING: EXPLOSION, SAFETY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury, death or property damage. System under pressure. Relieve pressure and recover all refrigerant before system repair or final unit disposal.