Carrier 48HC D17 Series Service And Maintenance Instructions page 2

highlight suggestions which will result in enhanced
installation, reliability, or operation.
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
!
FIRE, EXPLOSION HAZARD
Failure to follow this
warning could result in
death, serious personal
injury 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
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.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can 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.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can 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.
NOTICE
OPERATIONAL TEST ALERT
Failure to follow this ALERT can result in an
unnecessary evacuation of the facility.
Pressing the controller's test/reset switch for longer
than seven seconds will put the duct detector into the
alarm state and activate all automatic alarm responses.
NOTICE
OPERATIONAL TEST ALERT
Failure to follow this ALERT can result in an
unnecessary evacuation of the facility.
Pressing the controller's test/reset switch for longer
than seven seconds will put the duct detector into the
alarm state and activate all automatic alarm responses.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on the fan system, shut off all unit power and
Lockout/Tag- - Out the unit disconnect switch. DO
NOT reach into the fan section with power still
applied to unit.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Lockout/Tagout this switch, if necessary.
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.
2
physically locked