9
Selecting the Minimum Electric Heat Airfl ow
—
The minimum electric heat airfl ow is selected by
setting switches 5 and 6. Selecting the minimum
electric heat airfl ow sets the minimum air fl ow
that will be produced whenever
electric heater kits are used. When the electric
heater kits are energized along with a heat pump,
the airfl ow may be higher depending on the basic
cooling/heat-pump airfl ow setting.
Reference Table 2 for recommended minimum
electric heat airfl ow settings. The minimum
electric heat airfl ow setting may be set higher,
but must never be set lower than the setting
shown in Table 2.
Selecting the Delay Profi le
—
The delay profi le
is selected by setting switches 7 and 8 (see Table
3). Delay profi le selection controls the start-up and
shut-down characteristics of the packaged heat
pump unit. By varying the start-up and shut-down
characteristics of the packaged heat pump unit
the system can be optimized for energy effi ciency,
humidity control, and comfort.
Select “Delay A” or “Delay B” for highest energy
effi ciency. “Delay A” has a two-step “on” delay.
The blower will begin operation at 31% airfl ow for
30 seconds. The second step operation is 75%
airfl ow for 30 seconds. After the two-step “on”
delay has been completed, the blower operation
will be 100% until the thermostat has been
satisfi ed. “Delay A” also provides a 60 second
“off” delay at 50% airfl ow.
“Delay B” has a single step 30 second “on” delay at
50% airfl ow. “Delay B” also provides a 90 second
“off” delay at 50% airfl ow. Select the delay profi le
which is most suited to the application.
The “De-Hum.” delay profi le may be used when
humidity control is desired without the use of the
optional humidistat. If the “De-Hum.” delay profi le
is selected, the air handler will run at 75% airfl ow
for the fi rst 10 minutes of each cooling cycle. If
the “De-Hum.” delay profi le is selected, the basic
cooling/heat-pump speed should be selected
at or near the top of the range for that nominal
capacity (see Table 1).
1 2 3 4 5 6 7 8
Delay A
0 0
Delay B
0 1
No Delay
1 0
De-Hum.
1 1
Switch Number
Delay Description
1 2 3 4 5 6 7 8
0-5
500
0 0
6-10
700
1 0
11-15
900
0 1
16-20
1100
1 1
Switch Number
Nominal KW
CFM
Table 2. Minimum Electric Heat Airfl ow
(all models)
Table 3. Delay Settings (all models)
Note: 0=Off, 1=On
Note: 0=Off, 1=On
Basic Air-Flow Setting
1 2 3 4
2.0
2.5
3.0
1 2 3 4
3.5
4.0
5.0
490 0 0 0 1
880 0 0 0 1
575 0 0 0 0
975 0 0 0 0
660 0 0 1 0
1080 0 0 1 0
770 1 0 0 1
1125 1 0 0 1
860 1 0 0 0
1265 1 0 0 0
895 0 1 0 1
1390 0 1 0 1
970 1 0 1 0
1455 1 0 1 0
1060 0 1 0 0
1590 0 1 0 0
1145 1 1 0 1
1690 1 1 0 1
1170 0 1 1 0
1785 0 1 1 0
1350 1 1 0 0
1915 1 1 0 0
1510 1 1 1 0
2125 1 1 1 0
Nominal
Capacity
CFM
Switch
Number
Nominal
Capacity
CFM
Switch
Number
1/2 HP Motor
3/4 HP Motor
Table 1. Air Flow Selection for Variable Speed Models
