External Off/On Control - Panasonic WH-MXC16G9E8 Service Manual

12.18 External OFF/ON Control


Communication circuit between indoor unit and external controller is as per below.
Panasonic
PCB
R25
1k
C30
R23
0.01µ
10k
16V

Maximum length of communication cable is 20 meter.

Control content:
External Control Switch
ON
ON
OFF
OFF
REMOTE
CONTROLLER
LED
REMOTE
CONTROLLER
SIGNAL
EXTERNAL
CONTROLLER
SWITCH
UNIT
* During External Switch OFF condition, it is allow to change the setting and also timer operation.
5V
4 1
3 2
PC1
G2 G2
Control Panel OFF/ON
ON
OFF
ON
OFF
HEATER
OPERATION
ON
OFF
ON
ON
ON
OFF
12V_4
17
18
R1
ZD2
Control Panel Power LED
AUTO
HEAT
MON TUE WED THU FRI SAT SUN
COOL
ON
TANK
OFF
FORCE
During EXTERNAL SW OFF,
OFF
OFF
75
CN-THERMO
ON
OFF
ON
OFF
ACTUAL
HEATER
hr BOOSTER
°C
QUIET
SETTING
kwh
hr
STATUS
°C
SERVICE
display "EXT SW OFF"
ON
OFF
External
Controller
System Status
ON
OFF
OFF
OFF