Carrier 48/50PG C03-14 manual Safety Considerations, Electrical Shock Hazard, Unit Damage Hazard

48/50PG and PM

TROUBLESHOOTING	37
Complete Unit Stoppage	37
Restart Procedure	37
Alarms and Alerts	37
Control Module Communication	44
Communication Failures	44
Cooling Troubleshooting	45
Humidi−MiZert Troubleshooting	46
Economizer Troubleshooting	47
Heating Troubleshooting	48
Phase Loss Protection	51
Thermistor Troubleshooting	51
Transducer Troubleshooting	52
Forcing Inputs and Outputs	52
MAJOR SYSTEM COMPONENTS	55
General	55
Main Base Board (MBB)	71
Economizer Control Board (ECB)	73
Integrated Gas Control (IGC) Board	75
Low Voltage Terminal Strip (TB1)	76
Scrolling Marquee Display	77
Accessory Navigatort Display	77
Carrier Comfort Network (CCN)R Interface	77
EnergyX	78
Field−Installed Accessories	79
SERVICE	82
Cleaning	82
Lubrication	84
Evaporator Fan Service and Replacement	85
Evaporator Fan Performance Adjustment	86
Evaporator Fan Belt Tension Adjustment	86
Condenser−Fan Adjustment	87
NOVATION Heat Exchanger Condenser
Service and Replacement	87
Verify Sensor Performance	87
Economizer Operation During Power Failure	87
Evacuation	87
Refrigerant Charge	88
Gas Valve Adjustment (48PG and 48PM)	91
High Altitude (48PG and 48PM)	92
Main Burners (48PG and 48PM)	92
Filter Drier	93
Protective Devices	93
Relief Devices	93
Control Circuit, 24−V	93
Replacement Parts	93
Diagnostic LEDs	93
EnergyX	93
APPENDIX A − LOCAL DISPLAY AND
CCN TABLES	94
APPENDIX B − CONTROL MODES WITH
Humidi−MiZert SYSTEM AND ECONOMIZER	112
APPENDIX C − START−UP DATA	113

APPENDIX D − ADDITIONAL START−UP DATA . . . . . . 169

CONTROL SET POINT AND CONFIGURATION LOG . . . 180

INDICATE UNIT SETTINGS BELOW . . . . . . . . . . . . . . . . 180

UNIT START−UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . 188

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment. Untrained personnel can perform the basic maintenance functions of replacing filters. Trained service personnel should perform all other operations.

When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

Follow all safety codes. Wear safety glasses and work gloves. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and National Electrical Code (NEC) for special requirements.

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, and CAUTION. 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 a hazard 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, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may cause equipment damage.

This unit uses a microprocessor−based electronic control system. Do not use jumpers or other tools to short out components or to bypass or otherwise depart from recommended procedures. Any short−to−ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.

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