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Installation
1 Stage Thermostat, 1 Stage AHU
AHU Control Unit (ACU)
Thermostat
Input
Y
Y1
Y2
G
G
W1
W1
W2
W2
D
D
O/B
O/B
R
C
DIP SW1
1
2
2 Stage Thermostat, 1 Stage AHU
AHU Control Unit (ACU)
Thermostat
Input
Y1
Y1
Y2
Y2
G
G
W1
W1
W2
W2
D
D
O/B
O/B
R
C
DIP SW1
1
2
16 English
AHU with Cooling-only Configuration (continued)
Indoor unit
Output
Y1
Y
Y2
G
G
W1
W1
W2
W2
D
D
O/B
O/B
R
R
C
C
on
off
3
4
5
6
7
8
Indoor unit
Output
Y1
Y
Y2
G
G
W1
W1
W2
W2
D
D
O/B
O/B
R
R
C
C
on
off
3
4
5
6
7
8
•
•
•
•
•
•
•
Please review the Option Settings section for
additional system option settings.
•
If the system is used as cooling-only and there is no
auxiliary heater, configure the thermostat as 2 stage,
cooling-only system. If a W1 or W2 signal is input, the
air-conditioner turns off.
•
If the indoor unit only has a Y input terminal, connect
it to the Y1 output terminal in the Indoor section of
the AHU Control Unit (ACU).
•
Use the key switch on the outdoor unit to select
Cooling only before using the system.
•
Connection of the dehumidification (D) terminal is
optional. If the thermostat and the AHU/furnace
supports a dehumidification signal, the outdoor unit
and AHU Control Unit (ACU) will adjust operation to
optimize dehumidification.
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