Johnson Controls YVAHP072B31S, Service Manual

Page: 286 / 1796

1-270
Service Manual
INSTALLATION
(8) All electrical work should be performed in strict accordance with electrical schematics in the
"Installation and Maintenance Manual".
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on the PCB for the communication line will blow. In this case, perform the recovery work as shown in
the diagrams below.
(a) Reconnect the wirings correctly.
(b) Set the No.1 pin at DSW7 (on the PCB) to ON.
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communication line, the PCB will be seriously damaged and will not recover.
L1
R
L2
AC 208V/230V
Incorrect Wiring Reconnect wirings correctly.
5V
A B 1 2
S
L1
R
L2
AC 208V/230V
5V
A B 1 2
S
ON
OFF
DSW7
Set No.1 Pin
at ON side.
PCB
1 2
(c) Wired Controller Connections between different refrigerant cycles
(a) Wired Controllers to each unit for an individual operation setting
(b) Single Wired Controller for an individual operation setting
Outdoor Unit
A B
Outdoor Unit
Indoor Unit Indoor Unit Indoor Unit Indoor Unit
A B
A B A B
Individual
Simultaneous
(Thermo ON / OFF individually)
Individual
Wired
Controller Wired
Controller Wired
Controller
Indoor Unit Indoor Unit
A B
Outdoor Unit
A B
Wired
Controller Wired
Controller
Outdoor Unit
Indoor Unit
A B
Communication cables
for the wired controller
are necessary.
Indoor Unit
A B
Wired
Controller
(10) Wired Controller Connection