Safety Considerations - Carrier 48GC04 Service And Maintenance Instructions

APPENDIX A — MODEL NUMBER
NOMENCLATURE. . . . . . . . . . . . . . . . . . . . . . . . . . 63
APPENDIX B — PHYSICAL DATA. . . . . . . . . . . . . . . 64
APPENDIX C — FAN PERFORMANCE . . . . . . . . . . . 67
APPENDIX D — WIRING DIAGRAMS . . . . . . . . . . . . 92
APPENDIX E — LOW AMBIENT CONTROL SENSOR
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1

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, re-
pair, or service air-conditioning equipment. Untrained person-
nel can perform the basic maintenance functions of replacing
filters. Trained service personnel should perform all other op-
erations.
When working on air-conditioning equipment, observe precau-
tions 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 avail-
able for all brazing operations.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for brazing operations. Have fire extin-
guisher available. Read these instructions thoroughly and fol-
low 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 sym-
bol . When you see this symbol on the unit and in instruc-
tions or manuals, be aware of the potential for physical injury
hazards.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety ALERT
symbol. DANGER indicates a hazardous situation which, if
not avoided, will result in death or severe personal injury.
WARNING indicates a hazardous situation which, if not
avoided, could result in death or personal injury. CAUTION
indicates a hazardous situation which, if not avoided, could re-
sult in minor to moderate injury or product and property dam-
age. IMPORTANT is used to address practices not related to
physical injury. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron ® (R-410A) refrigerant systems operate at higher pres-
sures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig (3450 Pa). Pressures greater
than 0.5 psig will cause gas valve damage resulting in haz-
ardous condition. If gas valve is subjected to pressure great-
er than 0.5 psig, it must be replaced before use. When pres-
sure testing field-supplied gas piping at pressures of
0.5 psig or less, a unit connected to such piping must be
isolated by closing the manual gas valve(s).
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Never use non-certified refrigerants in this product. Non-
certified refrigerants could contain contaminates that could
lead to unsafe operating conditions. Use ONLY refrigerants
that conform to AHRI Standard 700.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit
performance or unit shutdown.
High velocity water from a pressure washer, garden hose,
or compressed air should never be used to clean a coil. The
force of the water or air jet will bend the fin edges and in-
crease airside pressure drop.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
Units with convenience outlet circuits can use multiple dis-
connects. Check convenience outlet for power status before
opening unit for service. Locate the disconnect switch and
lock it in the open position it. LOCKOUT/TAGOUT this
switch to notify others.
IMPORTANT: Lockout/tag-out is a term used when elec-
trical power switches are physically locked preventing
power to the unit. A placard is placed on the power switch
alerting service personnel that the power is disconnected.
2
WARNING
CAUTION
WARNING