Forced Cooling /Heating Operation (Master Unit); Emergency Stop Control - Mitsubishi Heavy Industries Hi-COP Series Service Manual

(d) Forced cooling /heating operation (Master unit)
(Note) Following explanation is based on using CnG terminal and setting function [P0]-[] with -segment display.
However other terminals can be used with following function setting of -segment display.
CnS: [P0]-[]
) When SW- on the outdoor control PCB is turned ON after setting function [P0]-[] with -segment display, if
CnG is shorted, forced heating operation is performed, but if CnG is open, forced cooling operation is performed.
2) If the different mode from the forced operation mode is commanded from indoor unit, the "mode unmatch" message
is displayed on the LCD of remote control and the operation is entered in FAN mode.
SW-
) With the forced mode from indoor unit, if a different operation mode is commanded, following operations take place
based on the forced cooling/heating operation set with the -segment [P].
P = 0: The operation mode unmatch is displayed on the remote control, etc., and it is changed to the fan
P = : It is operated with the forced cooling/heating operation mode.

(5) Emergency stop control

When one of indoor units receives the emergency stop signal through CnT terminal on the indoor control PCB from the device
like as refrigerant leakage detector and that information is transmitted to the outdoor unit, the outdoor unit stops operation and
emergency stop error message transmitted to all indoor units running.
It is able to make the emergency stop function effective by remote control indoor function setting.
(a) When the outdoor unit receives the "Emergency stop" command from the indoor unit, it makes all stop by error.
(b) And the "Emergency stop" command is transmitted to all indoor units and error code "E" is displayed.
(c) When the outdoor unit receives the "Emergency stop reset" command from the indoor unit, the "Emergency stop reset"
command is transmitted to all indoor units.
CnS: [P0]-[]
Open
ON CnG
Shorted
OFF Normal operation
operation.
Setting temperature for cooling ... 28 ℃
Setting temperature for heating ... 20 ℃
–
CnG: [P0]-[]
Operation in cooling only
Operation in heating only

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'14 • KX-SM-204