PRODUCT DESIGN
67
O
F
F
O
F
F
8 7
4 3 2 1
O
F
F
O
N
4 3 2 1
O
N
O
F
F
4 3 2 1
O
N
O
N
4 3 2 1
Cooling
Speed
Tap A
Cooling
Speed
Tap B
Cooling
Speed
Tap C
Cooling
Speed
Tap D
*
Cooling Speed Taps
(
*
indicates factory setting)
O
F
F
O
F
F
8 7
4 3 2 1
O
F
F
O
N
8 7
4 3 2 1
O
N
O
F
F
8 7
4 3 2 1
O
N
O
N
8 7
4 3 2 1
Heating
Speed
Tap A
Heating
Speed
Tap B
Heating
Speed
Tap C
Heating
Speed
Tap D
Heating Speed Taps
(
*
indicates factory setting)
*
O
F
F
O
F
F
4 3 2 1
O
F
F
O
N
4 3 2 1
O
N
O
F
F
4 3 2 1
Normal
+ (Plus)
Adjust
- (Minus)
Adjust
Adjust Taps
(
*
indicates factory setting)
*
8 7
8 7
8 7
8 7
8 7
8 7
6 5
6 5
6 5
6 5
6 5
6 5
6 5
6 5
6 5
6 5
6 5
5. The variable speed circulator blower also offers several
custom ON/OFF ramping profiles. These profiles may
be used to enhance cooling performance and increase
control level. The ramping profiles are selected using DIP
switches 5 and 6. Refer to the following figure for switch
positions and their corresponding taps. Refer to the bul-
let points below for a description of each ramping profile.
Turn OFF power to the furnace for a minimum of 10 sec-
onds, allowing motor to reset and recognize the new profile
selection. Turn ON power to the furnace. Verify profile
selection by counting the green CFM LED blinks and
timing each step of the ramping profile.
•
Profile A provides only an OFF delay of one (1) minute
at 100% of the cooling demand airflow.
OFF
100% CFM
Cooling
Demand
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 sec-
onds. The motor then ramps to 100% of the required
airflow. A one (1) minute OFF delay at 100% of the
cooling airflow.
100% CFM
100% CFM
1 min
Cooling Demand
50% CFM
1/2 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.
OFF
1 min
100% CFM
100% CFM
82% CFM
7 1/2 min
Cooling Demand
•
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.
82% CFM
7 1/2 min
100% CFM
50% CFM
1/2 min
1/2 min
50% CFM
OFF
OFF
Cooling Demand
O
F
F
O
F
F
8 7
4 3 2 1
O
F
F
O
N
4 3 2 1
4 3 2 1
4 3 2 1
Ramping
Profile
Tap A
Ramping
Profile
Tap B
Ramping
Profile
Tap C
Ramping
Profile
Tap D
*
Ramping Profiles
(
*
indicates factory setting)
8 7
8 7
8 7
6 5
6 5
6 5
6 5
O
N
O
F
F
O
N
O
N