Carrier 48TC 04 Series Service And Maintenance Instructions page 2

physical injury. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or
operation.
IMPORTANT: Lockout/Tagout is a term used when
electrical power switches are
preventing power to the unit. A placard is placed on
the power switch alerting service personnel that the
power is disconnected.
CAUTION
!
CUT HAZARD
Failure to follow this caution can result in personal
injury.
Sheet metal parts can have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
air conditioning units.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance operations
on unit, LOCK- - OUT/TAGOUT the main power
switch to unit. Electrical shock and rotating equipment
could cause severe injury.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits can use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
the disconnect switch and lock it in the open position
it. LOCK- - OUT/TAGOUT this switch to notify others.
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
pressures than standard R- - 22 systems. Do not use
R- - 22 service equipment or components on Puron
refrigerant equipment.
physically locked
2
CAUTION
!
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 increase airside pressure drop.
WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Disconnect gas piping from unit when pressure testing
at pressure greater than 0.5 psig. Pressures greater
than 0.5 psig will cause gas valve damage resulting in
hazardous condition. If gas valve is subjected to
pressure greater than 0.5 psig, it must be replaced
before use. When pressure 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).
WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never use air or gases containing oxygen for leak
testing or for operating refrigerant compressors.
Pressurized mixtures of air or gases containing oxygen
can lead to an explosion.
WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death 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.