Carrier 50HCQA Safety Considerations, Electrical Shock Hazard, Unit Operation And Safety Hazard

50HCQA

Return Air Enthalpy Sensor . . . . . . . . . . . . . . . . . 29 Indoor Air Quality (CO2 sensor) . . . . . . . . . . . . . 30 Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 30 Connecting Discrete Inputs . . . . . . . . . . . . . . . . . . 30 Communication Wiring - Protocols . . . . . . . . . . . . 31 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Local Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 RTU-MP Troubleshooting . . . . . . . . . . . . . . . . . . 32 Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 34 Supply Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Return Air without Economizer . . . . . . . . . . . . . . 35 Return Air with Economizer . . . . . . . . . . . . . . . . . 35 Step 11 - Adjust Factory-Installed Options . . . . . . . . 42 Step 12 - Install Accessories . . . . . . . . . . . . . . . . . . . 43

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes (in USA, ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.

It is important to recognize safety information. This is the

safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch.

!WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal injury, death and/or equipment damage.

Puronr (R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment.

!WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD

Failure to follow this warning could cause personal injury or death.

Relieve pressure and recover all refrigerant before system repair or final unit disposal.

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

!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing heat pump units.

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