Trane CXAJ series Installation, Operation And Maintenance Manual page 39

Wiring Diagram of Centralized Controller
Centralized Controller
TRANE ADC_OT03 VER1.00
SW2
CN2
U6
ON
BA +V
gnd
C15
GND
POWER
+V
+9~12V
Description of ground terminal for RS485 control wire
• Forbid to be connected to the high voltage 220V ground wire terminal of the iron sheet for
• RS485 ground port G is the ground terminal of the DC power supply for the electric control
Installation requirements of RS485 communication cable
1. Requirements of communication line: RS485 wiring must be AWG 18-22, the line diameter
2. Requirements of hand by hand wiring: each system module is provided with two terminals A
3. Wiring requirements of shielding layer: after being twisted, the shielding layer is covered
4. When the network is unstable, install the terminator (shipped with the Centralized Controller)
Function of centralized controller
Introduction
Single-unit operation: the centralized controller can operate any single unit on the network, for
example, start up and shut down, change the mode, change the set temperature and so on.
Multi-unit operation: the centralized controller can start up and shut down all connected units on
R26
MODULE
LINE
NEGETIVE
SW1
CN1
CN2
SW2
CN6 TH1 TH2 TH3 TH4 TH5 TH6
A B
CN4
A
B
SHIELD LAYER
the electric control box.
panel.
must be larger than 0.75 mm2, the twisted pair shall be provided with the shielding layer, and
the twist distance shall not be more than 5 cm. It is recommended to use BELDEN, 5320FE.
and B for RS485 connection, and the module of the outdoor unit is provided with the terminal
G besides the terminals A and B for connecting the shielding layer of the communication
line. The shielded twisted pair must be wired hand by hand without star connection, i.e. 1 is
connected to 2, 2 is connected to 3, and 3 is connected to 4, which is correct; if 1 is connected
2, 2 is connected to 3, and 2 is connected to 4, it will be wrong.
with the adhesive tape to prevent from being connected with 220V ground wire, and one end
of the shielding layer is connected with the earth point G of the outdoor unit control cabinet.
When the module of the outdoor unit is connected, the shielding layer is connected to the
terminal G. Forbid to be connected to 220V ground wire terminal of the iron sheet for the
electric control box.
to the communication ports A and B of the last unit of the network.
MODULE
LINE
N-COM
NEGETIVE
ADC_OD_CO1
EN-SAVE
C/H SW1
OVHT/HP2
FREZ/LP2
CN1
FLOW
OV-PUMP
OV-FAN
CN2
OV-COMP1
SW2
OV-COMP2
HP1
LP1
TH1 TH2 TH4
CN6 TH3
G A B G
CN5
A
B
SHIELD LAYER
Module Control System
LINE
N-COM
ADC_OD_CO1 NEGETIVE
EN-SAVE
C/H
OVHT/HP2
FREZ/LP2
CN1
FLOW
OV-PUMP
OV-FAN
CN2
OV-COMP1
OV-COMP2
HP1
LP1
TH6 TH1
TH5 CN6
B
A G A B G
CN4 CN5
A
B
SHIELD LAYER
MODULE
N-COM
ADC_OD_CO1
EN-SAVE
C/H
SW1
OVHT/HP2
FREZ/LP2
FLOW
OV-PUMP
OV-FAN
OV-COMP1
SW2
OV-COMP2
HP1
LP1
TH2 TH4 TH6
TH3 TH5
B
A G A B G
CN4 CN5
Grounding
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