Description of optional input signals
Fixing operation mode (heating / cooling) (
/
)
This input function is fixed in terminal CN1 of the PCB of the RASC unit, to use it as a cooling or heating mode. CN1
must be set up as follows.
• Short circuit between the terminals 1 and 2 of CN1: Set heating mode.
• Short circuit between the terminals 2 and 3 of CN1: Set cooling mode.
After having pre-fixed the established mode, the remote control can only be used to adjust the temperatures. Stoppage
code “d1” “20” is displayed if an attempt is made to change the operation mode of any of the indoor units with the remote
control.
Example of wiring diagram for fixing the operation mode.
Cooling
Heating
3P connector cable
CN1
RASC unit PCB
Power supply
SS1: Fixing operation mode switch
SS2: Changeover switch
X1: Heating
X2: Cooling
Demand thermo OFF (
3
)
This signal allows to stop the compressor as well as to put the indoor unit in Thermo-OFF condition. When the
compressor is stopped, this function allows the operation of the indoor unit fans to prevent air stratification. Stoppage
code “d1=10” is displayed on the remote control. If the switch of this function is disconnected, it becomes available again.
Connect the cabling and use the materials as shown in section
.
Forced stoppage (
5
)
This signal allows to control the stoppage of the compressor and the fans of the indoor as well as RASC units. This
function can be useful when used with the alarm signals of the fire prevention systems. Stoppage code “d1=10” is
displayed on a remote-controlled when this option is turned on. If the switch of this function is disconnected it becomes
available again.
Connect the cabling and use the materials as shown in section
.
?
N O T E
The minimum set interval for demand or forced stoppage should be 30 minutes in consideration with the compressor’s start/stop frequency
and energy-saving.
6 Optional functions
Optional external input and output signals
SMGB0091 rev.2 - 11/2015
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