AH - A 3
Air Handler
Electric Heater Terminals
A 4-wire harness provides 24V output to the electric
heater contactors (Figure 1 )
Pin 1 1st stage electric heat
Pin 2 2nd stage electric heat
Pin 3 3rd stage electric heat
Pin 4 Common
Humidifier Terminals - (HUM)
(Figure 1 ) A set of N.O. contacts (¼” QC male
terminals) will close for operation of a humidifier when
the control is in heating mode and the blower is
operating.
24V to 240VAC operation, 1 amp max.
Serial Port Variable Speed Motor
A 4-wire harness (Figure 1 ) enables
communication between the serial port variable
speed blower and the air handler control board.
VS – Com Plug
Pin 1 12VDC Power
Pin 2 RX Motor to Control Data Line
Pin 3 Common
Pin 4 TX Control to Motor Data Line
Figure 1
Electronic Air Cleaner Terminals (EAC)
(Figure 1 ) A set of N.O. contacts (¼” QC male
terminals) will close for operation of the air cleaner
anytime the blower is operating.
24V to 240VAC operation, 1 amp max.
Status LED
The Status LED (Figure 1 ) will turn on solid at
power-up during the initialization sequence.
Slow Flash = No call.
Fast Flash = Call for heat, cool or fan only.
On: Open Fuse or control faults
Control Board
A
B
C
D
E
F
G
A
B
C
D
E
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