15
•
Profile A provides only an OFF delay of one (1) minute
at 100% of the cooling demand airflow.
OFF
100% CFM
100% CFM
1 min
OFF
•
Profile B ramps up to full cooling demand airflow by first
stepping up to 50% of the full demand for 30 seconds.
The motor then ramps to 100% of the required airflow.
A one (1) minute OFF delay at 100% of the cooling air-
flow.
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
•
Profile C ramps up to 82% of the full cooling demand
airflow and operates there for approximately 7 1/2 min-
utes. The motor then steps up to the full demand air-
flow. Profile C also has a one (1) minute 100% OFF
delay.
100% CFM
OFF
OFF
•
Profile D ramps up to 50% of the demand for 1/2 minute,
then ramps to 82% of the full cooling demand airflow
and operates there for approximately 7 1/2 minutes.
The motor then steps up to the full demand airflow.
Profile D has a 1/2 minute at 50% airflow OFF delay.
OFF
OFF
S5
S6
S5
S6
S5
S6
S5
S6
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Tap A*
Tap B
Tap C
Tap D
Dip Switches - Cooling Airflow Ramping Profiles
7. If an electric heater kit has been installed, determine
the heater kilowatt (kW) rating. Using the Electric Heat
Airflow table on page 16, set dip switches 9, 10, and 11
for the installed heater. The adjust setting (already es-
tablished by the cooling speed selection) also applies
to the electric heater kit airflow. Thus, the electric heater
airflow is adjusted by the same amount. This does not
apply to systems setup with a communicating thermo-
stat. See Set-Up section in the A
IR
H
ANDLER
A
DVANCED
F
EATURES
M
ENU
on page 22. Verify selected CFM by
counting the green CFM LED blinks.
If an electric heater kit has not been installed, set dip
switches 9, 10, and 11 to any valid heater kit setting
(see ariflow table for valid settings). This will prevent an
Ec Error code from being displayed.
NOTE:
For installations not indicated in the preceding
Temperature Rise Tables, the following formula is to be used:
TR = (kW x 3412) x (Voltage Correction) / (1.08 x CFM)
Where: TR
= Temperature Rise
kW
= Heater Kit Actual kW
3412
= Btu per kW
Voltage Correction
=.96 (230 Supply Volts)
=.92 (220 Supply Volts)
=.87 (208 Supply Volts)
1.08
= Constant
CFM
= Measured Airflow
NOTE:
The Temperature Rise Tables can also be used to
determine the air handler airflow delivery. When using these
tables for this purpose set the room thermostat to maximum
heat and allow the system to reach steady state conditions.
Insert two thermometers, one in the return air and one in the
supply air. The temperature rise is the supply air temperature
minus the room air temperature.
Use HKR specification sheets to determine the HKR avail-
able for a given air handler.
