McQuay MDS080B R Installation Manual page 22

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