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Troubleshooting ECM
Continuous
Mode of
Blower
OFF
Operation
(Ventilation
Mode)
Thermostat
24 VAC
—
"G"
Input
Signals
Pin #1
24 VAC "C" (Common) Signal, Always Energized
Pin #2
Not Used
Pin #3
24 VAC "C" (Common) Signal, Always Energized
Pin #4
Not Used
Pin #5
Not Used
Pin #6
Pin #7
Not Used
Pin #8
Not Used
Pin #9
Pin #10
Pin #11
Not Used
Pin #12
24 VAC Hot "R" Signal, Always Energized
Pin #13
Pin #14
Pin #15
X
Pin #16
Not Used
FIGURE 28
Control Connector Motor Half
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
1
2
3
4
5
Power Connector Motor Half
TABLE 6
Indoor Blower Motors
TM
Part Load
Cooling
Full Load
Dehum.
("Y1-Y2"
Cooling
Mode
Jumper
Removed)
"G",
"G", "Y1"
"D"
"Y1","Y2"
X
X
X
X
X
X
X
X
X
PWB Header
*
Suggested mating connector
Housing — AMP 350809-1
Contact — AMP 350537-1
** WARNING – Applying 240VAC line input with
PIN 1 to PIN 2 jumper in place will permanently
MIS-2839
damage unit!
Heat 1st
Heat 1st &
Bank of Elec.
2nd Bank of
Heat
Elec. Heat
"G", "B/W1",
"G", "B/W1"
"W2"
X
X
X
X
X
X
X
X
Power Connector
AMP 1-350945-0
PIN
Description
1
Jumper Pin 1 to Pin 2 for
120VAC Line Input Only **
2
3
Chassis Ground
4
AC Line
5
AC Line
Manual 2100-752C
Page
35 of 41
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