Carrier 48ZT - Manual (Page 5)

5
When replacing your unit filters, always use the same size
and type of filter that was originally supplied by the installer.
Units with outdoor air capability have a cleanable filter for
the outdoor air. This filter should be checked annually and
cleaned as necessary. Remove by removing screws in outdoor-
air filter retainer and sliding filters out of the unit.
Heat Exchanger — To ensure dependable and efficient
heating operation, the heat exchanger should be checked by a
qualified maintenance person before each heating season, and
cleaned when necessary. This checkout should not be attempt-
ed by anyone not having the required expertise and equipment
to do the job properly. Checking and/or cleaning the heat
exchanger involves removing the gas controls assembly and
the flue collector box cover and, when completed, reinstalling
the gas controls assembly for proper operation. Also, the flue
collector box cover must be replaced correctly so that a proper
seal is maintained. Contact your dealer for the required period-
ic maintenance.
Never operate your unit without filters in place. Failure to
heed this warning may result in damage to the blower
motor and/or compressor. An accumulation of dust and lint
on internal parts of your unit can cause loss of efficiency
and, in some cases, fire.
STEP 1
STEP 2
STEP 3
STEP 4 STEP 5
STEP 6 STEP 7
Fig. 3 — To Shut Unit Off
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ENTER
MODE
ESCAPE
LOCK-OUT
TAG
ON
OFF
MAIN