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To connect a humidifier, utilize the
passive signal "WORK" output (CN23)
port as well as the G and C wires on the
controller, and wire the humidistat and
humidifier per above wiring diagram.
When the fan is running, the CN23 relay
will be closed, which will allow power
to the humidifier when the humidistat
is below humidity setpoint. If the
thermostat or zone controller has an
HUM interface, connect the humidifier
directly to the HUM and C ports.
• Dehumidification control wiring
S4
DH
ON
1 2
R
Dehumidification control requires
external Humidistat at DH and R.
Set S4-2 as OFF. When the humidity
rises and exceeds the set value of
the Humidistat, the 24V signal of DH
changes to 0V, the cooling system
starts the dehumidification operation,
and the air volume drops to 80% of the
nominal cooling air volume.
• UV, fresh air or ion generator wiring
work
24V control signal or 208/230V power supply
The WORK port is linked with the fan.
When the fan is running, the relay
is closed; if an active 24V signal is
required, it can be directly connected
to the G and C ports.
Control Logic
Indoor Unit Connector
Connector
R
C
G
Y1
Y/Y2
B
W
W1
W2
E/AUX
DH/DS/BK
L
HUMIDISTAT
Outdoor Unit Connector
Connector
R
C
Y1
Y2
B
W
D
L
LED Display
The control displays unit status as well as
any active fault codes on the LED display.
UV, fresh air or
If the unit is functioning normally, the LED
ion generator, etc
will display current temperature setpoint
or if a 24V thermostat is used, a functional
display code from the table below will be
shown. When a fault code is active, the
display will flash the active fault code.
Please refer to the fault code table
located in the troubleshooting section
of the Service Manual for detailed fault
code information.
Purpose
24V Power Connection
Common
Fan Control
Low Cooling
High Cooling
Heating Reversing Valve
Heating control
Stage 1 Electric Heating
Stage 2 Electric Heating
Emergency Heating
Dehumidification/Zoning control
System Fault Signal
Purpose
24V Power Connection
Common
Low Cooling
High Cooling
Heating Reversing Valve
Heating control
Dehumidification control
Defrost heat
System Fault Signal
Page 41
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