COOLING OFF - DELAY OPTIONS
SWITCH SETTINGS
SELECTION
NOMINAL
AIRFLOW
5 - OFF 6 - OFF NONE SAME
5 - ON 6 - OFF 1.5 MINUTES 100% *
5 - OFF 6 - ON 3 MINUTES 50%
5 - ON 6 - ON ENHANCED** 50 - 100%
** - This ENHANCED MODE selection provides a ramping
up and ramping down of the blower speed to provide
improved comfort, quietness, and potential energy savings.
The graph shows the ramping process.
OFF OFF
50%
80%
100% if necessary
50%
Dehumidify
Fast Coil Cooling
and Heating
Efficiency
7.5
minutes
3
minutes
1
minute
FAN OPERATION (CFM)
COMPRESSOR OPERATION ON
OFF
as required
From Dwg. 800796a
CFM
SELECTION
LIGHT
DIP
SWITCHES
ECM FAN CONTROL
Figure 20
J. AIRFLOW ADJUSTMENT
CAUTION
!
Disconnect power to the air handler before changing
dip switch positions. Failure to follow this procedure
may result in equipment damage.
Blower speed changes are made on the ECM Fan Con-
trol mounted on the control box. The ECM Fan Control
controls the variable speed motor.
There is a bank of 8 dip switches (See Figure 20). The
dip switches work in pairs to match the airflow for the
outdoor unit size (tons), cooling airflow adjustment, Fan
off-delay options, and heating airflow adjustment. The
switches appear as shown in Figure 21.
If the airflow needs to be increased or decreased, see
the Airflow Label on the air handler or the Blower Per-
formance Table in the Service Facts. Information on
changing the speed of the blower motor for your specific
outdoor model size is in the Blower Performance Table.
Be sure to set the airflow for the correct tonnage.
Refer to blower housing for correct setting.
Switches 1 - 4 Cooling Airflow
Switches 5 - 6 Fan Off Delay Options
Switches 7 - 8 Auxiliary Heat
If the optional humidistat is used, remove R-BK jumper
from the low voltage terminal board (not shown) and in-
stall the humidistat between R and BK. (Jumper R to O
for cooling-only/non-heat pump systems with a humidis-
tat.)
INDOOR BLOWER TIMING
IMPORTANT:
Leave dip switch 5 & 6 in the "as-shipped" position
during system start-up and check out. Afterwards, ad-
just as desired.
The FAN-OFF period is set on the ECM Fan Control
board by dip switches #5 and #6. The blower off-delay
settings are as follows:
DIP SWITCHES (AS SHIPPED)
COOLING
HEATING
AIRFLOW
FAN OFF
DELAY
AUXILIARY
HEAT SPEEDS
Figure 21
K. CHECKOUT PROCEDURE
1. Check the Air Handler installation in accordance
with the instructions on page 16.
2. “Operational Procedure” for the system installation
can be found in the outdoor unit installer guide and will
be compatible with this Air Handler.
NOTE: Direct drive motors have bearings which are
permanently lubricated and under normal use lubrica-
tion is not recommended.
To Next Page
Loading...
