Circulator Blower - Goodman AVPTC42D14 series Installation & Operating Instructions Manual

17 Circulator Blower

This air handler is equipped with a multi-speed circulator blower. This blower provides ease in adjusting blower speeds.
The Specification Sheet applicable to your model provides an airflow table, showing the relationship between airflow (CFM)
and external static pressure (E.S.P.), for the proper selection of heating and cooling speeds. The heating blower speed
shipped is set at 21kW or 25kW, and the cooling blower speed is set at "D". These blower speeds should be adjusted by the
installer to match the installation requirements so as to provide the correct electric heating CFM and correct cooling CFM.
Use the CFM LED (green) to obtain an approximate airflow quantity. The green CFM LED blinks once for each 100 CFM of
airflow.
1. Determine the tonnage of the cooling system installed with the air handler. If the cooling capacity is in BTU/hr divide it
by 12,000 to convert capacity to TONs.
Example: Cooling Capacity of 30,000 BTU/hr.
30,000/12,000 = 2.5 Tons
2. Determine the proper airflow for the cooling system. Most cooling systems are designed to work with airflows between
350 and 450 CFM per ton. Most manufacturers recommend an airflow of about 400 CFM per ton.
Example: 2.5 tons X 400 CFM per ton = 1000 CFM
The cooling system manufacturer's instructions must be checked for required airflow. Any electronic air cleaners or other
devices may require a specific airflow; consult installation instructions of those devices for requirements.
3. Knowing the air handler model, locate the high stage cooling airflow charts in the Specification Sheet applicable to your
model. Look up the cooling airflow determined in step 2 and find the required cooling speed and adjustment setting.
Example: An AVPTC30C14 air handler installed with a 2.5 ton air conditioning system. The airflow needed is 1000
CFM. Looking at the cooling speed chart for AVPTC30C14, find the airflow closest to 1000 CFM. A cooling airflow of
1000 CFM can be attained by setting the cooling speed to "C" and the adjustment to "0" (no adjustment).
4. Locate the blower speed selection DIP switches on the integrated con-
trol module. Select the desired "cooling" speed tap by positioning
switches 1 and 2 appropriately. If airflow adjustment is required, set dip
switch S8 (trim enable) to ON (trim enable default is off). Then select
the desired "adjust" tap by positioning switches S3 and S4 appropri-
ately. Refer to the following Airflow Adjust Taps figure for switch posi-
tions and their corresponding taps. Verify CFM by counting the number
of times the green CFM LED blinks, see page 13 for LED locations.
5. Continuous fan speeds that provide 25, 50, 75, and 100% of the air
handler's maximum airflow capability are selectable via dip switches
S12 and S13.
If the air handler's maximum airflow capability is 2000 CFM and 25%
continuous fan speed is selected, the continuous fan speed will be
0.25 x 2000 CFM = 500 CFM.
6. The multi-speed circulator blower also offers several custom ON/OFF
ramping profiles. These profiles may be used to enhance cooling
performance and increase comfort level. The ramping profiles are
selected using DIP switches 5 and 6. Refer to the following Dip
Switches - Cooling Airflow Ramping Profiles figure for switch positions
and their corresponding taps. Refer to the bullet points below for a
description of each ramping profile. Verify profile selection by count-
ing the green CFM LED blinks and timing each step of the ramping profile.
Tap A
OFF
S1
S2
Cooling Airflow Speed Tap (*indicates factory setting)
+5%
OFF
S3
S4
Airflow Adjust Taps (*indicates factory setting)
Cooling Airflow and Airflow Adjust Taps
25%
OFF OFF
12
S12
S13 13
Fan Only Selection (*indicates factory setting) Fan Only Selection (*indicates factory setting)
14
Tap B Tap C
ON OFF ON OFF ON
S1 S1
S2
S2
Figure 22
-5% +10%
ON OFF ON OFF ON
S3
S3
S4
S4
Dip Switches -
Figure 23
50%* 75%
ON ON OFF OFF ON ON OFF OFF ON ON
S12 12 S12 12
S13 13 S13 13
Figure 24
Tap D*
OFF ON
S1
S2
-10%
OFF ON
S3
S4
100%
OFF OFF ON ON
12
S13 13