Carrier 42CT Series - Page 19

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7.3. Motor Fan Assembly
Disconnect the power supply to the unit before carrying out any work on the
unit.
Remove the filter.
Remove the fan access panel.
Disconnect the fan assembly power supply cables (power and control wiring for
variable-speed motor).
The fan assembly and its panel are held in place by four screws. Remove these
screws and slide the assembly down.
Remove the fan motor assembly.
To re-install, follow the reverse procedure, ensuring that the electrical supply is
isolated, making sure to reconnect all wiring harnesses. Dirt and dust should not
be allowed to accumulate on the fan impeller or housing. This can result in an
unbalanced fan impeller and damage the impeller or motor. The impellers can
be cleaned periodically with a vacuum cleaner and brush.
Note: Be careful not to damage the fan impellers during the Note: Be careful not to damage the fan impellers during the
removal process to avoid unbalancing the fans.removal process to avoid unbalancing the fans.
WARNING: The electrical connections to the fan motor must be WARNING: The electrical connections to the fan motor must be
made in accordance with the labels on the connector block.made in accordance with the labels on the connector block.
WARNING: A check on the fan/motor assembly is advisable WARNING: A check on the fan/motor assembly is advisable
to ascertain if any overheating of the motor is occurring and to ascertain if any overheating of the motor is occurring and
that the fan impeller is free running and has not sustained any that the fan impeller is free running and has not sustained any
damage. If any overheating is occurring, check that the full damage. If any overheating is occurring, check that the full
load current of the motor is within the nameplate rated value, load current of the motor is within the nameplate rated value,
the impeller is running freely and that there is no obstruction the impeller is running freely and that there is no obstruction
upstream or downstream of the fan causing a high resistance upstream or downstream of the fan causing a high resistance
with consequent lack of airflow.with consequent lack of airflow.