Johnson Controls CICM008B21S, Service Manual

Page: 112 / 152

5-14
SM-18003
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING
5.4.1.6 Picking Up Operation Signal
Up to 3 of the following 7 signals can be picked up by setting this function to CN7 and CN8 according to
the following figures. Make sure to use a field-supplied remote control adopter PSC-5RA for picking up
signals. The wiring length shall be 230 ft. (70m) or less. The settings for picking up signals (1), (2) and (4)
are already set at the factory.
(1) Picking Up Operation Signal [ Output Setting: Code (01) ]
This function is utilized to pick up an operation signal that has nothing to do with the compressor
stoppage by a thermistor. An example of basic wiring is shown below. The contact of the auxiliary
relay “RYa” is closed when this operation signal is given. This function enables the signal check during
remote control operation and an interlock of the fan for air inlet, etc. The contact of the auxiliary relay
“RYa” is opened while the protection devices are activated.
Picking Up Operation Signal
(Example: Operation Output is set to terminals 1 and 2 of CN7.)
RY
CN7 Connector
CN7
1 2
3 P Connector
Indoor Unit PCB
Auxiliary Relay
RYa
(2) Picking Up Alarm Signal [ Output Setting: Code (02) ]
This signal is utilized to pick up an alarm signal while safety devices are activated. However, this
function is not available during abnormal communication of the wired controller. An example of basic
wiring is shown below. The contact of the auxiliary relay “RYa” is closed while the protection devices
are activated.
CN7 Connector
Indoor Unit PCB
Auxiliary Relay
CN7
RYa
1 3
3 P Connector
RY
Picking Up Alarm Signal
(Example: Alarm Output is set to terminals 1 and 3 of CN7.)