Samsung AM072BXV Series Service Manual page 304

Key Options
8-5 Applications (cont.)
8-5-3 Application of Auxiliary Heat Module (cont.)
■ Connecting the external contact software to the outdoor unit's Main PBA
output connection(CN804) output connection(CN804)
Main PCB
Setting outdoor unit option switch and key function Setting outdoor unit option switch and key function
Optional Input
item unit
Silent mode for
Main
night-time
Samsung Electronics
Outdoor unit's Main PBA
External contact input (CN803)
Receive and control necessary
contact input signals from the
outside (e.g., quiet mode)
How to use external contacts
External contact External contact
+12V +12V
S/W S/W
① ①
Error_ CHECK Error_ CHECK
② ②
_OUTPUT _OUTPUT
③ ③
S/W S/W
COMP_CHECK COMP_CHECK
④ ④
_OUTPUT _OUTPUT
CN85 CN85
Main PCB
SEG1 SEG2 SEG3 SEG4
0 0
0 1
0 2
0 7
0 3
0 4
0 5
0 6
External contact output(CN804)
Contact output of Comp/error
status to the outside is possible
External contact External contact
input connection(CN803) input connection(CN803)
EXTERNAL_CONTORL EXTERNAL_CONTORL
-INPUT -INPUT
CN86
Main PCB Main PCB
Function of the
option
Disabled (Factory default)
LEVEL 1 / Auto
LEVEL 2 / Auto
LEVEL 3 / Auto
LEVEL 1 / External contact
LEVEL 2 / External contact
LEVEL 3 / External contact
S/W S/W
① ①
② ②
CN86
Remarks
Enables the silent mode for night-time
(It operates automatically depending on the
temperature.)
However, if the external contact interface
module (MIM-B14) is used, entering the
silent mode is available
with contact signal.
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