©2005 McQuay International
21
PCB
B
A
A
B
PCB
Connect A with B, wrong
A
B
A
B
c
o
m
2
Connection port
Connection port
c
o
m
2 com1
Typical wrong wiring connection as shown as below:
n o t b u s s t r u c t r u e , c o n n e c t i o n c a b le
s h o u ld b e l a y e d a s b u s s t r u c t u r e
B
p
c
A
i
n
A
p
c
B
i
n
O u t d o o r u n it
C o n t r o l b o x
M a in P C B
C o n n e c t i o n
p o r t
S c r e e n
la y e r
B
A
A
B
P C B
C o n t r o l b o x
I n d o o r u n i t 1
I n d o o r u n it 2
C o m m u n ic a t i o n c a b l e
C o m m u n i c a t io n c a b le
P C B
C o n t r o l b o x
A
B
A
B
C o n n e c t io n p o r t
C o n n e c t io n p o r t
c o m 1
c
o
m
2
c
o
m
2
c o m 1
B
p
c
A
i
n
A
p
c
B
i
n
Screen layer must be
grounded with outdoor unit
Control box
Connection
port
Main PCB
PCB
A
B
Neglect to
connect
A
B
Connection port
com1
c
o
m
2