Carrier 50LJ - Manual

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HEATING & COOLING
48LJ, 50LJ/LW024
Single-Package Cooling Units
Installation, Start-Up and Service
Instructions
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning equipment can
be hazardous due to system pressure and electrical compo­
nents. Only trained and qualified service personnel should
install, repair or service air conditioning equipment.
Untrained personnel can perform basic maintenance func­
tions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per­
sonnel. When working on air conditioning equipment, ob­
serve precautions in the literature, tags and labels
attached to the unit, and the other safety precautions that
may apply.
Follow all safety codes, including ANSI Z223.1-1984.
Wear safety glasses and work gloves. Use quenching cloth
for unbrazing operations. Have fire extinguisher available
for all brazing operations.
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personnel injury.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance. Do not touch any
electrical switch; do not use any phone in your build­
ing. Immediately call your gas supplier from a neigh­
bor’s phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the fire
department.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other
appliance.
A WARNING
Improper installation, adjustments, alteration, service
or maintenance can cause injury or property damage.
Refer to this manual. For assistance or additional in­
formation, consult a qualified installer, service agency
or the gas supplier.
A CAUTION
Disconnect gas piping from unit when leak testing at
pressures greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in a
hazardous condition. If gas valve is subjected to pres­
sure greater than 0.5 psig, it must be replaced. When
pressure testing field-supplied gas piping at pressures
of 0.5 psig or less, the unit connected to such piping
must be isolated by manually closing the gas valve.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Book|1 |1 PC 111 Catalog No. 564-937 Printed in U S A Form 48/50LJ,LW-2SI Pg 1 2-92 Replaces; 4/50LJ,LW-1 SI
Tab la 1b