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FIGURE 23
ECM INTERFACE BOARD
FIGURE 24
ECM MOTOR SETTINGS
(This board is located in the blower section)
34
DO NOT WIRE DIRECTLY TO THIS BOARD. THERMOSTAT SHOULD
LED
BE WIRED TO PIGTAILS LOCATED BELOW THE CONTROL BOX.
FIRST-STAGE COOLING INPUT
(THIS BOARD IS LOCATED IN THE BLOWER SECTION)
TABLE 7
SWITCH FUNCTIONS
Switch
1 & 2
3 & 4
5 & 6
7 & 8
9 & 10
Refer to Figure 24 for switch identification and factory default settings.
IMPORTANT: Disconnect power to unit when changing DIP switch positions. Even if blower
is not operating, the motor will not recognize changes in DIP switch positions until unit power
is removed and then restored.
B. TR NSFORMER PROTECTION
The ECM interface board is equipped with an automotive-style 3 amp ATC blade fuse for
transformer protection. (See Figure 23.) If a short circuit occurs on the secondary side of the
transformer, the fuse will open.
C. USING THE ON-BO RD LED TO DETERMINE BLOWER CFM
The ECM interface board LED, which is located in the blower section (see Figure 23), indi-
cates blower output by flashing one (1) second for every 100 CFM of airflow. The LED will
pause 1/10 second between each flash. After the blower CFM has been displayed, the LED
will illuminate dimly for 10 seconds before repeating the sequence. (See Table 8.)
NOTE: If airflow is not a multiple of 100 CFM, the last LED flash is a fraction of a second of
100 CFM.
SECOND-STAGE COOLING INPUT
Function
Not Used
Cooling Airflow Adjustment
Heating Airflow Settings
Cooling Delay Profiles
On-Demand Dehumidification
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