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Installer’s Guide
ECM Fan Motor Adjustments
If the airflow needs to be increased or decreased, see the
Airflow Table in the SERVICE FACTS. Information on chang-
ing the speed of the blower motor is in the Blower Performance
Table. Blower speed changes are made on the ECM Fan Control
mounted in the control box. The ECM Fan Control controls the
variable speed motor. There is a bank of 8 dip switches, (See
Figure 20 below), located on the board. The dip switches work in
pairs to match the cooling/heat airflow (CFM/TON), Fan off-delay
options and electric heat airflow adjustment. The unit ships with
dip switches defaulted as shown below.
CFM
SELECTION
LIGHT
DIP
SWITCHES
CFM FAN
R W3 W2 W1
Y Y LO
J
21C800796P01
CNT03600
Figure 20. ECM Fan Control
Owner Maintenance
Maintenance
EXPLOSION HAZARD!
To prevent an explosion or possible injury, death, and equip-
ment damage. Do not store combustible materials, gasoline,
or other flammable vapors or liquids near the unit.
WARNING
!
Some of the periodic maintenance functions of the 4YCZ6 unit can
be performed by the owner; this includes replacing the disposable
or cleaning the permanent air filters, cleaning the unit cabinet,
and conducting a general unit inspection on a regular basis.
Filters
When
the system is in constant operation,
inspect the filters
at least once each month.
If you have disposable-type filters, replace them with new filters
of the same type and size.
Do not attempt to clean dispos-
able filters.
Permanent-type filters can be cleaned by washing them with a
mild detergent and water. Make sure that the filters are thoroughly
dry before reinstalling them in the unit (or duct system).
NOTE:
It may be necessary to replace permanent filters
annually if washing fails to clean the filter or if the filter shows
signs of deterioration. Be sure to use the same type and
size as was originally installed.
Condenser Coil
Be sure to keep all vegetation and debris away from the condenser
coil area.
