Panasonic WH-MDC05F3E5, Service Manual

Page: 74 / 142

74
12.18 External OFF/ON Control

Communication circuit between indoor unit and external controller is as per below.
External
Controller
Panasonic
PCB
CN-THERMO
5V
12V
1
2
mico

Maximum length of communication cable is 20 meter.

Control content:
External Control Switch Control Panel OFF/ON Control Panel Power LED System Status
ON ON ON ON
ON OFF OFF OFF
OFF ON ON OFF
OFF OFF OFF OFF
REMOTE
ON
ON ON
ON
OFF
OFF UNIT
OFF
OFF OFF
ON
CONTROLLER
During EXTERNAL SW OFF,
display “EXT SW OFF”
LED
REMOTE
CONTROLLER
SIGNAL
EXTERNAL
CONTROLLER
SWITCH
OPERATION
ACTUAL
HEATER
BOOSTER
QUIET
SETTING
STATUS
SERVICE
AUTO
HEAT
COOL
TANK
HEATER
FORCE
°C
°C
ON
OFF
MON TUE WED THU FRI SAT SUN
hr
hr
kwh
* During External Switch OFF condition, it is allow to change the setting and also timer operation.