AHU KIT WIRING CONFIGURATION WITH DDC
25
E
N
G
L
IS
H
Digital Input(5ch)
Wiring
No.
Input
Logic
Conditions
Open
Short
DI 01-3 Operation
Off
Operation
On
-. When short, the fan signal (FAN) is On
and ODU will start to run.
-. When open, ODU will off and FAN
changes to Off.
-. Operation mode
: DI 23-3/23-2
-. Fan mode
: DI 45-3/45-2
DI 23-3
FAN
Operation
Cooling or
Heating
-. When open, FAN is On but ODU will
not run.
-. When short, FAN is On and mode is
decided DI 23-2.
-. If no more cooling and heating is nec-
essary, DI 23-3 is open and DI 01-3 is
On.
-. DI 01-3 : short
DI 23-2
Cooling
Operation
Heating
Operation
-. When open, mode is cooling
-. When short, mode is heating
-. DI 01-3 : short
-. DI 23-3 : short
DI 45-3
Low FAN
Mid FAN
-. When DI 45-3/45-2 are open : Low fan
mode and FAN is On.
-. When DI 45-3 is short : Mid fan and
FAN is On.
-. DI 01-3 : short
-. Operation mode
: DI 23-3/23-2
DI 45-2
High FAN
-. When DI 45-2 short : High fan and
FAN is On.
-. When DI 01-3 is open : FAN is Off, DI
45-3,/45-2 are neglected.
NOTE
!
Fan signal (FAN) can be delayed on heating mode start up despite of fan mode (DI 45-3/45-2)
because fan signal (FAN) will be On , if temperature of refrigerant pipe sensors (PIPE_IN,
PIPE_Out) are higher than 20°C to prevent cold air discharge.
DI Specification
: Non-Voltage Contact
DI Wring concept
